编号问题选择A选择B选择C选择D答案1―Before disconnecting the oil pipe, would you flush the oil retained in the pipe ________?‖ asked the oi by using of fresh water with compressed air by using of sea water with chemical compound B 2―Stand by an engine‖ means ________.―prepare to stop the engine‖―assemble an engine on its bedplate‖―make an engine ready for starting‖―dismantle an engine‖C
3 A ________ is the foundation of the engine, without the support of which the shaft alignment in particu frame bedplate cylinder liner B
4________ are commonly used in mechanical-hydraulic governor to sense engine speeds.Doors Bulks Flyweights Flywheels C
5________ are generally formed in the frame of the both in-line and Vee engines to give maintenance a Doors Aspirate gauzer Coupling Blind A
6________ arrangements have low temperature air and high temperature exhaust gas passing through Loop scavenge Gross scavenge Uniflow scavenge Supercharge A
7________ became oval, it should be machined.The upper half of cross-head bearing The cross-head pin The cross-head bearing The cross-head guide plate B
8________ device is provided to prevent starting air from being admitted to the cylinder before the rever An automatic A transmission A self-regulating An interlocking D
9________ fuel oils ________lubricating oils require treatment before passing to the engine.Both / and Neither / nor Either / or Both / or A 10________ is sometimes used for piston cooling since leaks into the crankcase would not cause proble Diesel oil Hydraulic oil Lube oil Mineral oil C 11________ is the removal of exhaust gases by blowing in fresh air.Gas exchange Charging Scavenging Supercharging C
The fuel oil The lube oil The sea water The fresh water D 12________ is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, th
13________ may be the first possible cause which makes the engine to lose power or slow down when it Hot bearing Starting valves Unequal distribution of load Excessive crankshaft clearance A 14________ of an engine crankshaft can be detected by measuring deflections of crank webs for each u Misalignment Length Strength Stresses A 15________ of the A-frames there is a strong cast iron frame called the scavenging air box.At the top At the bottom In the top In the bottom A 16________ pistons have low inertia and high coefficient of thermal expansion.Cast iron Cast steel Forged steel Aluminum D 17________ scavenging means both exhaust ports and scavenging ports are arranged to the same side.Uniflow Cross Loop Straight C 18________ should not undertake any task which will interfere with the supervision duties relating to the The watch keeping personnel The chief engineer The person on a bunker barge Any of the above A 19________ tappet clearance will cause the exhaust valve to open early and close late in cycle and will in Excessive Insufficient Correct None of the above B
Correct Insufficient Excessive None of the above C 20________ tappet clearance will cause the exhaust valve to open late and close early in cycle and will re
Correct Insufficient Excessive None of the above is correct.C 21________ tappet clearance will cause the exhaust valve to open late and close early in cycle and will re
At the beginning of the compression stroke At the beginning of the suction stroke At the end of the working stroke At the end of the exhaust stroke A 22________ the cylinder will contain a great weight of air and will be capable of burning a great quantity o
23________ the supercharge pressure is, ________power an engine develops.The higher / the more Higher / more Higher / little The higher / the less A
An automatic A transmission An interlocking A self-regulation C 24________ device is provided to prevent starting air from being admitted to the cylinders before reversin
25________ is not properly set thus causing either advanced or retarded firing. A piston A fuel injection pump A feed water pump A lube oil pump B 26________ means that both exhaust ports and scavenging ports are arranged on the same side.Uniflow scavenge Cross scavenge Loop scavenge Straight scavenge C
Piston Sounding Regulating Connecting C 27________ rods are not in proper condition so that too much fuel is supplied to the corresponding cylind
The piston rod The push rod The sounding rod The connecting rod C 28________ shows 1.2 meter and the specific gravity of the oil is 0.96. According to the measuring scale
29________ allows for expansion and water make up in the water cooling system. A top tank A head tank A head valve A drain tank B 30________ at the end of the distribution pipe ensures that adequate pressure is maintained by the pum A relief valve An alarm A pressure gauge A non-return valve B 31________ is used for washing and drinking.The ballast system The salt water system The bilge system The domestic system D 32________ provide the water to the pistons.Pneumatic pies Hydraulic pipes Telescopic pipes Operating gas pipes C 33________ are fitted in the exhaust system and facilitate charge removal and scavenging in each cylind Diffusers Compressors Steam boilers Soot blowers A 34________ are formed by abrasive particles entering the bearing and scoring the shaft.Grooves Recesses Ridges Nips A 35________ are mounted on and bolted to the bed-plate cross girders.The crankshaft The crankcase The guide-ways The frames D 36________ is a precaution which contributes to avoiding trouble under operating conditions.Constant inspection Keeping constant load Remaining constant temperature Varying speed A 37________ is a source of power by which the diesel engine may operate.Water energy Electrical energy Chemical energy Heat energy D
A filter A centrifuge A distiller A generator
B 38________ is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a
39________ is fully floating in both connecting rod small end and the piston skirt.The piston rod The cross head pin The gudgeon pin The crank-pin C 40________ is made of a boss with separated blades mounted into it. A variable pitch propeller A variable pitch nut A fixed pitch parallel A fixed pitch screw A 41________ is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.An air receiver An operating valve An automatic valve An air distributor D 42________ neutralizes the acid conditions and ________ cleanses the rings and grooves.The detergency / the alkalinity The alkalinity / the detergency The inhabitant / the water The additives / the distilled water B 43________ of the controllable pitch propeller enables the blades to be moved to change the pitch angle.An external mechanism An internal mechanism An interlock device A hunting gear system B 44________ on a ship transmits power from the engine to the propeller.Automatic control system Speed regularly system The transmission system Compression air system C 45________ or air venting arrangement is fitted to the fuel supply passage.An air pump A compressor A fuel pump A priming D 46________ providing lubricating films, oil used in marine diesel engines have to remove heat from oil co Except for Beside Except In addition to D 47________ the engines, the diesel engine is ________ used engine on board.Between / more commonly Among / the most commonly Between / not more commonly Among / not the most commonly B 48________ water is more expensive than fresh water, it has high specific heat and low viscosity.Distilled Distilling Boiling Boiled A 49________ for the camshaft gear train is taken from a spur gear which for a six cylinder engine is at the The driven gear The drive The grease The lubricating oil B
Because Owing to For No matter D 50________ in what position the engine stops there will always be at least one of the cylinders with its sta
51________ is secured by means of side-chock bolts and end-chock bolts.The bedplate The column The main bearing The double bottom A 52________ controls the fuel oil temperature in order to provide oil at the correct viscosity for combustion
The viscosity regulator The temperature controller The flow meter The pressure switch A
The coupling flange The camshaft The cross-head pin The cylinder jackets A 53________ for attachment to the propeller shaft also accommodates the turning gear and is integrally fo
54________ should be taken out, cleaned, and lifting checked every four to six months.Pistons Fuel injection valves Crankshaft Cylinder covers B 55________ usually helps to induce air movement to assist combustion.cylinder cover Main bearing The exhaust valve The piston movement D 56________ may have two emergency source of power, thus requiring two emergency https://www.doczj.com/doc/1e17804075.html,rge passenger vessels General cargo ships Container ships Oil tankers A 57________ supplies pilot air to control the cylinder air start valves.An air compressor An indicator cock An air distributor A safety valve C 58________ less equipment in contact with sea water, the corrosion problems are much reduced in a ce Because With Without Though B 59________ clearances in the main or crank pin bearings will sometimes be indicated by loss of pressur Too larger Too smaller Excess Excessive D
60 A ________ on the delivery side of the pump closes to stop fuel oil returning from the injector.return valve non-return valve safety unit stop valve B
61 A ________ ensures a constant pressure at the fuel main.transfer pump control air bottle pressure regulating valve non-returning valve C
62 A cast steel strong back is fitted in way of the combustion space to help absorb ________.flame temperature fuel oil air movement gas forces D
63 A charge of fresh air is drawn into the engine cylinder and then ________ by the moving piston _____pressed / to pressurized / with pushed / in compressed / to D
64 A common trouble with the fuel pump plunger or fuel valve spindle is ________.water leakage steam leakage oil leakage air leakage C
65 A common trouble with the fuel pump plungers or fuel valve spindle is ________.broken down stuck oil leakage carbonized C
66 A diesel engine is similar to a gasoline engine except that the former has no ________.corss-head cylinder connecting rod spark plug D
67 A diesel engine's crankcase oil level is found to be too high. You should suspect that ________.the engine was over filled there might be a fuel leak there might be a water leak all of the above D
68 A distance piece, known as a ________ may be interposed between the rod and the bearing housing.bearing shell bearing liner compression plate lead wire C
compression pressure compression test compression ratio compression clearance C
69 A distance piece, with ground faces, known as a compression plate, may be interposed between the ro
70 A governor automatically controls engine speed by regulating ________.fuel supply firing order engine load oil level A
71 A heater in the circuit facilitates warming of the engine prior to ________ by circulating hot water.starting stopping to start to stop A
72 A high temperature alarm or ________ which will melt is used to guard against the explosion of compr a flame trap a relief valve a fusible plug a bursting cap C
73 A hot air start pipe indicates that there is ________.inefficient cooling a leaking air start valve a clogged drain valve a leaking air bottle B
74 A level gauge for a tank is to ________.give the pressure give the contents give the shape of the tank give the accuracy level B
75 A low speed engine requires ________ reduction gearbox ________ it and propeller.none / both no / both none / between no / between D
76 A lubricant often has to perform many duties in any situation, in addition to its fundamental job of ____resisting oxidization reducing friction promoting moving speed developing inertia B
77 A main bearing consists of two shells which are secured by means of studs and ________.tie rods through bolts lead wires bearing caps D
78 A number of cylinder liners are enclosed in one cast iron casing to form a ________.cylinder cover cylinder block cylinder frame bed-plate B
79 A number of different scavenging methods ________ in slow speed two-stroke engines.are in use is used are using has been used A
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80 A reduction in load on a diesel engine results in ________ of speed of the crankshaft. a a reduction an increase an outing a downwards B
81 A sealing arrangement is provided at ________ of the tail-shaft with the propeller and cone completing both ends neither end the outboard end either end D
to help to limit to protect to remove B 82 A separate piston cooling system is used ________ any contamination from piston cooling glands to th
between / to either / or from / to neither / nor C
83 A separate piston cooling system is used to limit any contamination ________ piston cooling glands __
84 A single piece ________ fitted with bronze rings guides the piston in the cylinder liner.piston skirt piston crown guide way cross-head A
85 A slow-speed two-stroke diesel is usually arranged to operate continuously on heavy fuel oil and has a lubricating oil diesel oil residual oil hydraulic oil B
86 A variable pitch propeller is made ________ a boss with separate blades mounted into it.of up of from out B 87A: Please tell me the specifications and quantity. B: ________.Pump diesel oil first300 tons of 180 cst fuel oil The figure is all right OK, I'll sign it B 88About half an hour before the engine is required, cooling water at ________ must be circulated.more than the working temperature less than the working temperature the working temperature the same as the surrounding temperature C
the pulse-phase system the pulse Doppler system the pulse system the pulse interval C 89According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into
90Acid solution ________ in the system can be tested from time to time by putting some on to a piece of strength dense percentage velocity A 91Additives ________ protective layers on metal surfaces guarding them against corrosion.damage form dissolve contaminate B 92Adjust ________ by means of lead wire.the clearance of the main bearing the diameter of main bearing the gap of main bearing the tolerance of main bearing A
Advanced nautical equipment advanced performance main engines emergency equipment communication and language skills D 93Administrations should bear in mind the significance of ________ in maintaining safety of life and prop
94A-frames and cylinder block is held together by ________ to form a rigid structure.Connecting rods piston rods tie rods jack-bolts C 95A-frames are mounted on the bedplate and support ________ and cylinder block.the main bearing the cylinder cover the entablature the sump C 96After ―F.W.E.‖ is given, the air system is shut down, the ________ gear put in, all drains and indicator steering timing turning running C 97After ensuring that the ________ is correct the bearing clearance should be checked.nap gap nip deflection C 98After fitting back in place the gear wheels, don't forget ________ them.to grease greasing oiling lubricating A 99After passing through the turbine the exhaust gas is conducted out into the ________.intercooler compressor cylinder open air D 100After the engine is warmed, we should ________ the turning gear before starting up the engine.take in put in take out put up C 101After the order―________‖ is given, the air system is shut down, the turning gear put in.Finished With Engine Stop The Engine Stand-by Engine Slow-down Engine A 102Air cocks, usually positioned at the ________ in a circulating system, is used to get rid of the air in the bending joint expansion tank weld the highest point D 103All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylin the running-in period the running process gas exchange process the boiler firing A
angled rounded being angled being rounded A 104All three systems have the ports ________ to swirl the incoming air and direct it in the appropriate path
105Although the crankshafts of medium diesel engines appear to be robust, they rely on the support of __the piston rods the crank throws the thrust bearings the main bearings D 106Aluminum pistons have ________ coefficient of thermal expansion compared with those of cast iron.h igher lower the same none of the above A 107Among the rings of a piston the ________ one is subjected to the greatest load and temperature.bottom middle top none of the above C 108An aluminum piston has lower inertia and higher coefficient of ________ compared to that of cast iron viscosity twisting moments inertia thermal expansion D 109An electrically driven automatically operating auxiliary blower is provided for slow speed and ________maneuvering operations bad combustion cooling mooring trial A 110An increase in load on a diesel engine results in ________ of speed of the crankshaft. a reduction an increase an outing a downwards A 111An indicator diagram is a pressure-volume graph taken from the pressure in the ________ of a workin crankcase fuel pump scavenge trunk cylinder D 112An interlock in the remote operating valve line stops the valve ________ when the engine turning gear to open opening open opened B 113An overspeed safety device is usually fitted to a generator engine for ________ in the event of overspe cutting power off the engine increasing the fuel pump setting braking the crankshaft stabilizing the ship speed A
electric heat mechanical exhaust B 114As a heat engine, ________ energy is the source of power by which the diesel engine can be operated
115As for a diesel engine, lack of combustion air may be due to ________.fouling turbine fuel pump faults lubrication failure excessive cooling A 116As the plunger moves up, the ports are closed and the fuel ________ and delivered to the injector noz being compressed to be pumped up is pressurized are built up C 117At least ________ cylinders in a two-stroke engine will be configured to ensure that the engine can be 61248C 118At least ________ cylinders in four-stroke engine will be configured to ensure that the engine can be s62128A 119At the top of the A-frames there is a strong cast iron frame called ________.cylinder liner cylinder cover the gear box the scavenging box D 120Be sure to make the engine turn by ________ before starting and after stopping.steering gear turning gear steering wheel turning cycle B 121Bearing knocks are likely to occur from ________.less clearance dirty lube oil overload bearing wear D 122Because the castings of smaller engines are not so big and heavy, ________ and cylinder block may b
the column the jacket cylinder cover cylinder liner A
hull projection graphitication foundation D 123Bedplates are the ________ of the engine, without the support of which the shaft alignment in particula
124Before ―stand by‖ ________ on the engine telegraph, it is usual to give the main diesel engine a brief tr is delivered is rung is sent is transferred B 125Before ―stand by‖ is rung on the engine telegraph, it is usual to give the main diesel engine a brief trial with power on power with air on air B 126Before ―stand-by‖ is rung on the engine telegraph, it is usual to give the main engine ________ ahead a brief trial with turning gear a brief trial on power a long trial by steering gear one minute's trial with windlass B 127Before a marine diesel engine is started the cylinders and pistons must be ________.cooled to appropriate temperature warmed up gradually to appropriate temperatur opened up and renewed ground and polished B 128Before being used the fuel service tank should be drained of ________.soda solution mechanical impurities ballast water and residuals D 129Before installing the seal, every part of the ________ and the rod should be carefully cleaned.bed-plate crankcase evaporator packing box D 130Before pumping up the crankcase oil, ________ should be worked by hand to minimize corrosive actio the indicators the starting valves the cylinder lubricators the turning gear C 131Before putting on the starting air, the reversing and control gear should be ________.operated stopped checked removed C 132Before replacing a piston you should check that all rings are ________.free fastened broken stuck A
above at over within D 133Before replacing a piston you should check the rings to see that all clearances and gaps are ________
134Before replacing a piston you should check the rings to see that all clearances and gaps are within the deflection discrepancy error tolerance D 135Before starting the engine the air bottle should be ________.pumped up loaded discharged opened A 136Before starting the turning gear, ________ should be worked by hand to minimize corrosive action on the indicators the starting valves the cylinder lubricators the turning gear C 137Blow-off of the relief valves of the engines cylinders may be caused by ________.too low load water in fuel too tight spring leakage D 138Blow-off of the relief valves of the main cylinders during operation indicates ________.the cylinder cover is cracked the injector holes is clogged the cams are not properly set fuel pump is leaking C 139Bridge gauge can be used to measure ________ of a diesel engine.diameters of journals deflections of crankwebs diameters of crankpins none of the above A 140Burmeister & Wain engines are very reliable but they very wisely provide excellent documentation to co
arise rise raise risk A
both of the above to prevent the lubricating oil from leaking out C 141Care and cleanliness are required when installing diesel fuel filters ________.to prevent the fuel system from becoming air to prevent the fuel system becoming clogged w
142Cast iron carrier rings, ________ machined grooves, are provided for all the piston rings.caulked into caulking into pressed into screwed into A 143Charging is the filling of the engine cylinder with a supply of ________ for compression.water fresh air fuel oil gas B
to need ready for want to going to be B 144Charging is the filling of the engine cylinder with a supply or charge of fresh air ________ compression
machine efficiency machinery efficiency mechanical efficiency mechanics efficiency C 145Charging-air pressure increases if there is incorrect combustion and drop in the ________ of the diese
146Compressed air is supplied by air compressors to ________.the air receivers the starting valves the cylinder covers the distributors A 147Compressed air is used on board ship ________.for starting diesel engines in pneumatic control system in pneumatic tools All the above are true D 148Constant cooling the various components of diesel engine has a number of functions except for _____good lubrication low thermal stress good mechanical properties acid corrosion D 149Cooling enables the engine metals ________ their mechanical properties.to retain to remain to maintenance to have A 150Cooling of engine is achieved by circulation a cooling liquid around internal passages within the _____boiler heater engine cooler C 151Cooling of engines is achieved ________.by blowing charge air by circulating with salt water by circulating with refrigerant by circulating with fresh water D 152Cooling of engines is achieved by ________ a cooling liquid around internal passages within the engin flowed flowing mixing circulating D
air passages pipes means B 153Cooling of engines is achieved by circulating a cooling liquid around internal ________ within the engin
154Cracks in cylinder and cylinder covers may ________ from unequal heating.make cause result produce C 155Cracks in the cylinders and cylinder covers may ________ unequal heating.result from result in give out given from A 156Cracks in the cylinders and cylinder covers may result from ________.low speed unequal heating less lubricating low charge air pressure B 157Crankshafts of medium speed engines are ________ from a single piece of steel.unusually solid welded never be solid forged almost invariably solid forged almost invariably be welded C
a exhaust valve a piston skirt a piston crown an air suction valve B 158Cross scavenging requires the fitting of ________ to prevent air or exhaust gas escape when the pisto
159Cross-head bearing bushes found worn out to be remetaled, clearance to be readjusted by means of _bridge gauge shim flexibled lead wire B
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160Cylinder liner cooling is often referred to as ________.piston cooling sleeve cooling central cooling jacket cooling D 161Cylinders of marine diesel engines are normally cooled by ________.sea water fine mineral oil sanitary water fresh water D 162Diesel engines are started by supplying ________ into the cylinders in the appropriate sequence for th cooling water compressing air compressed air cylinder oil C 163Diesel engines are started by supplying ________ into the cylinders in the appropriate sequence for th fuel oil diesel oil compressed air jacket water C 164Diesel oil may be used to cool ________ of a diesel engine.cylinders exhaust valves pistons fuel valves D 165Dirt in the fuel oil system of a diesel engine can cause ________.clogged filters poor combustion overloading of the diesel shock of fuel lines A 166Dirty oil must ________ before being used again.wash loosen be mixed be purified D 167Dirty oil must be ________ before being used again.mixed with clean oil purified heated strained B 168Doors are generally formed in the ________ of the both in-line and Vee engines to give maintenance a bedplates columns cylinder blocks safety caps B 169Due to ________ action of pistons some relative motion between parts in contact in the coolant supply reciprocating rotating running removing A 170During ________, the starting air valves should be closed to prevent the engine from turning.overhaul running blowing down All of the above are correct A 171During repair, lubrication lines and orifices must be ________.taken away engaged connected sealed off D 172During the inspection, the starting air valves should be closed ________ the engine from turning.to increase to speed up to prevent to reduce C 173During the suction stroke, the piston is moving ________.inwards outwards downwards upwards C 174During working, when the piston is near the ________, the air ignites the fine spray of fuel.TDC DTC BDC BCD A
throw crankshaft crankpin crosshead C 175Each crank is made up of two crank webs joined by a common ________ to which the bottom end bea
176Each cylinder has one starting valve which is usually opened by air pressure and closed by ________.nuts and bolts new joints spring force sealing rings C 177Each cylinder is closed a the top by a ________, made of a special heat-resistant steel.cylinder liner coupling flange cylinder cover piston crown C 178Each cylinder liner on the marine medium speed engines ________.is usually cooled by sea water can be replaced when worn out is in direct contact with the water in the bore can't expand when heated B 179Each journal and pin should be examined for ________ and grooving.bridges recesses rears ridging D 180Each of the engine cylinders is lubricated from a lubricator, driven by ________. a separated motor the engine's camshaft the engine's piston a turbine B 181Each piston stuffing box is provided with two sealing rings and three ________.packings piston rings distributor rings scraper rings D
oil grease fresh water sea water D 182Early stern-tube bearing used bearing materials such as lignumvitae which were lubricated by _______
183Either a low injection pressure or a leakage of piston rings is able to lead ________. a high exhaust temperature a high smoky exhaust a high output a high compression B 184Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if any pipes chromed welded galvanized bolted C
the latter latter former the former A 185Emulsion oils and sodium nitrite are both approved additives, but ________ cannot be used if any pipe
186Energy losses due to ________ occur in every machine.speed friction impact atmosphere B 187Engage the flywheel with the ________.turning gear motor driving gear driven gear A
timing deviation firing order phase A 188Engine ________ refers to the relative time of position of crank, at which each operation during the cyc
timing power firing order dead center A 189Engine ________ refers to the relative time of position of crank, at which each operation during the cyc
190Engine fuel pump index is ________.the viscosity index the fuel oil contents the starting speed the reading at the rack D 191Engine speeds at which resonance can occur are termed ________.maximum speeds full speeds sea speeds critical speeds D 192Excessive clearances in the main or crank-pin bearings will sometimes be indicated by ________ befo loss of flow in the fuel system loss of pressure in the system loss of flow in the lubricating system loss of pressure in the lubricating system D
①+②①+③②+③①+②+③B 193Exhaust temperature increases in all cylinders, the possible cause may be ________. ① increased scavenging air temperature, ② air in fuel pumps and fuel valves, ③ fouling of air and gas passages.
194Expansion tank should be used to remove ________ from cooling water.scale sludge chemicals air D
throughput back pressure gravity disc None of the above is wrong D 195Factor influencing the position of the interface between the liquid seal and the oil in a purifier is ______
196Failure of fuel injection is usually due to trouble in the ________.exhaust valves mechanical lubricators cooling water pumps fuel injection pumps D 197Fix the fuel injector into ________ after repair.the cylinder liner the cylinder cover the cylinder jacket the piston B 198For a diesel engine, when the piston is at the ________, the clearance volume is the largest.TDC DTC BDC DBC C
intercooler open air oil fired boiler B and C B 199For a generator engine, after passing through the turbine the exhaust gas may be conducted out into th
200For a main diesel engine the lube oil in the bearings is drawn from ________, usually located in the be a gravity tank a sump a vessel a bottle B 201For an ordinary four-stroke diesel engine the exhaust valves close ________.after TDC before TDC after BDC before BDC A 202For an ordinary four-stroke engine the exhaust valves open ________.after TDC before TDC after BDC before BDC D 203For an ordinary four-stroke engine the inlet valves open ________.after TDC before TDC after BDC before BDC B 204For an ordinary modem marine four-stroke engine the inlet valves close ________.after TDC before TDC after BDC before BDC C 205For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into cylinder casing cylinder bore crankcase door aperture in the cylinder block C 206For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the cylinder cover the bottom of bed-plate the sump the crankcase door D 207Four strokes consist of suction, compression, ________ and exhaust https://www.doczj.com/doc/1e17804075.html,bustion condensation charging evaporation A 208Fresh water is used for the cooling of cylinder jackets and ________ of the marine diesel engine.cylinder covers lubricating space crosshead exhaust manifold A 209Fresh water is used for the cooling of the cylinder jackets and ________ of the main engine.covers crankshaft cross-head shoe the sea water in the fresh water system A 210Fuel has been injected but ignition fails. The possible cause may be ________.leaky exhaust valve increased scavenging air temperature engine cylinders not scavenged sufficiently water in the fuel oil D
the fuel igniter the fuel injector the fuel pump A 211Fuel injected into a diesel engine's cylinder is ignited by ________.the heat compressed fuel／air mixture in the cylinder
controller governor instrument apparatus B 212Fuel injection uses the jet pump system and a Woodward type hydraulic ________ is used to control e
213Fuel injection valves should be taken out, cleaned, and lifting checked every ________.two to four months four to six months six to eight months year B 214Fuel is delivered into the combustion space by ________. a cooling system a lubricating system an electric system an injection system D 215Fuel is not supplied to the corresponding cylinder due to a failure of ________.the motor the fresh water generator the governor the fuel pump D 216Fuel is not supplied to the corresponding cylinders due to ________. a failure of the motor a failure of lubricator a failure of cylinder a failure of fuel pump D 217Fuel oil is pumped by means of ________ from the bunker tanks. a transfer pump a bilge pump a service pump a vacuum pump A 218Fuel oil is thought to be one of the main factors ________ the operation and maintenance of an engine have nothing to do with having nothing to do with have much to do with having much to do with D 219Fuel pump index is ________.the viscosity index the fuel oil contents the starting speed the reading at the rack D 220Fuels of high quality with their earlier ignitions will cause higher ________ pressure in cylinders of a di compression maximum rated oil B
gravity motion ratio density B 221Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have
222Generally the gudgeon pin is fully floating in both connecting rod small end and ________.the crosshead the crankshaft large end the piston bosses D 223Generally, the gudgeon pin is fully floating in both connecting rod small end and ________.the piston rings the piston rods the piston bosses the piston heads C 224He said that he had turned the main engine one complete revolution with the ________.turning gear steering gear spur gear chain gear A 225He took the ________ and checked the tank table in the office and recorded all relevant data, as well a water level sump level ballast tank level ship's trim D 226Head tank should be used to remove ________ from cooling water.scale sludge chemicals air D 227Heat energy is a source of power, but ________ will cause damage to the engine.excessive heat insufficient heat effective cooling high output A 228Here some oil in the oily water separator, as a result of its lower ________, will separate and rise into t temperature.viscosity density velocity C
many thousand times between times one time at times A 229High-speed rotating in a centrifugal purifier can produce a force ________ larger than the force of grav
230Hitachi B&W, 2-stroke cycle, single acting direct reversible, cross-head, welding design type diesel en the type of a pump the type of a turbo-charge the type of an accessory equipment the type of a main engine D 231If we wanted to increase the output further, the main engine ________.would be overload would be overloaded must overload is overloaded B 232If ________ are taken at regular intervals, any unequal distribution of load will be easily found out.differential of crank-webs indicator diagrams lube oil reading out misalignment of crank-throws B 233If a cylinder is not firing ________.its exhaust temperature will be low the temperature at its cooling water outlet will b
neither A nor B both A and B A 234If a kind of liquid is used to cool the diesel engine, it is invariably called ________.lubricant coolant combustion product second refrigerant B 235If an auxiliary diesel engine does not shut off, the trouble may be ________.leaky fuel injectors low firing pressure high firing pressure seizure of pistons A
A 236If an auxiliary diesel engine stalls frequently, the main cause may be ________.faulty fuel injection equipment excessive crankshaft clearance an incorrectly assembled governor idle sprin high exhaust back pressure from one cylinde
bad exhaust valves not enough air leaking fuel injecting all of the above D 237If black smoke is coming from the exhaust stack of a diesel engine, what could be the trouble? ______
238If diesel oil in this tank is used, the ________ of the oil must not exceed 120 degree F.viscosity flash point acid value temperature D 239If some of the cylinders are not firing, the ________ affected may be determined by watching exhaust that those ones meter C
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240If some of the cylinders are not firing, the ones affected may be determined by watching ________.the exhaust temperature the exhaust pressure the governor the fuel flow meter A
repaired replaced replenished repeated B 241If the atomizer holes are enlarged beyond the maker's recommended size, the atomizer must be _____
242If the engine ________ for a long period, there will be a danger of frost.must to stand inoperative has to stand inoperative must be stood idle will stand idle B 243If the engine does not start on air, it may be due to ________.low compression of the fuel pumps incorrect timing of fuel pumps the starting air valves stuck air-locks in fuel oil pipeline C
failure of the fuel pumps starting air pressure too low stop valve in air line closed the turning gear still engaged A 244If the engine does start on air, but combustion does not immediately begin, the cause may be _______
245If the engine does start on air, but combustion does not immediately begin, the cause may not be ____low compression failure of the fuel pump to discharge fuel incorrect timing of fuel pump turning gear being still on D
the crankcase explosion lifting of the cylinder safety valve a scavenge fire opening of the manhole A 246If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below
247If the flame from combustion in the cylinder of a two-stroke engine passes the piston into the space be the crankcase explosion lifting of the cylinder safety valve a scavenge fire opening of the manhole C 248If the needle valve in a fuel injection nozzle sticks open ________.no fuel will be delivered through the nozzlethe nozzle will overheat and crack time of injection will change fuel will leak into the drain line C 249If the sump ________ were to rise this would indicate water leakage into the oil and an investigation in temperature viscosity lever level D 250If there is water in fuel oil, the revolution of the engine will ________.decrease increase be dismantled be reassembled A
cross loop aspirate uniflow D 251In ________ scavenging the incoming air enters at the lower end of the cylinder and exhaust gases are
252In ________ scavenging the incoming air is directed upwards and the exhaust gases travel down and cross loop aspirate uniflow A
loop scavenging.cross scavenging uniflow scavenging supercharging B 253In ________ the incoming air is directed upwards, pushing the exhaust gases before it and then the ex
254In ________ the incoming air passes over the piston crown then rises towards the cylinder head. The loop scavenging cross scavenging uniflow scavenging supercharging A
pressure charged naturally aspirated contaminated high speed diesel A 255In a ________ engine the charge of air in the cylinder before compression commences is above atmos
fresh water sea water cooling oil emulsion A 256In a central cooling system, used in some modern ships, sea water is supplied to cool ________ which
main bearings sea water cooling oil lower temperature fresh water D 257In a central cooling system, used in some modern ships, sea water is supplied to cool ________ which
258In a common oil cooler circulated by sea water, the oil is at a ________ pressure than the sea https://www.doczj.com/doc/1e17804075.html,rger safety lower bursting A 259In a commonly used fuel oil system, the oil is stored in tanks in the double bottom from which it is pum a service tank a settling tank an expansion tank a double bottom tank B 260In a complete oil / water separator, more oil will separate out onto the underside of these plates and tra a separator oil water an oil collecting space B 261In a diesel engine, fuel must be broken up into a spray of fine droplets to ________.increase its quality obtain complete burning reduce its weight all of the above B 262In a diesel engine, smoky exhaust may be an indication of ________.high compression bad water cooling excessive burning oil improper fuel grade C 263In a four-stroke engines the camshaft rotates at ________.half the engine rotational speed twice the engine rotational speed the engine rotational speed four times the engine rotational speed A 264In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any l oil sea water air fresh water A 265In a marine diesel engine the oil sump is ________.just below the crankcase the oil cup for the exhaust valve the pan for collecting drain fuel oil oil circulating pump A 266In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the ___bowl periphery bowl center upper surface lower surface A 267In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible the outlet of oil the outlet of water the bowl periphery the center of bowl C 268In a two-stroke engine the camshaft rotates at ________ the engine rotational speed.half twice the same speed as four times C 269In a typical fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to __a service tank a collecting tank a sump a settling tank D 270In a typical fuel system, the oil is stored in ________ in the double bottom.setting tanks service tanks tanks drain tanks C 271In addition to lubricating cylinder oil assists in forming a gas seal and contains ________ which clean additives water grease acid solution A 272In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drill crosshead crankpin crank journal gudgeon pin D 273In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a ___telescopic pipes large bore drilled passage tied rod C 274In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the c downwards / upwards upwards / downwards downwards / downwards upwards / upwards A 275In an four-stroke engines the camshaft rotates at ________.half the engine speed twice the engine speed the engine speed four times the engine speed A
oil sea water refrigerant fresh water A 276In an oil cooler circulated by sea water, the oil is at a larger pressure, the result being that any leak in th
277In an ordinary diesel engine the fuel injection begins ________.after TDC before TDC after BDC before BDC B 278In an ordinary four-stroke engine the exhaust valves open ________.after TDC before TDC after BDC before BDC B 279In each cylinder cover is a large central opening for mounting ________.the indication cock the starting valve air inlet valve the exhaust valve D 280In each cylinder cover there are two or three holes for ________.the exhaust valves the fuel valves indicator cocks the fuel pumps B 281In four strokes engine, the cycle of events is completed in four strokes of ________.the cylinder the crankshaft the piston the cross-head C 282In general, ________ is suitable for delivering small quantities at high pressure.reciprocating pump gear pump centrifugal pump vane pump A
inefficiency oiliness detergency purity C 283In large marine diesel engines cylinder oils usually contain additives formulated to impart the ________
284In order to ensure perfect atomization, the fuel oil ________ before injection.has to be cooled has heated has preheated has to be preheated D 285In order to ensure the safety of the ship and its equipment during UMS operation, certain essential fun must be provided may be provided have provided can be provided A 286In order to increase the wearing resistance, the cylinder liner surfaces are sometimes ________.aluminum-plated bronze-plated zinc-plated chromium-plated D 287In order to inspect both piston and cylinder wall thoroughly, the cylinder cover should be taken off and craned out rolled out lifted out turned out C 288In some designs the cylinder oil is timed so that the oil injects only on the ________.piston crown piston groove piston skirt piston ring belt D 289In the ________ pressure charging system the pulse of energy that occur as the exhaust is released f constant pulse high none of the above B
cooling water vapor from the boiler starting air hot gases D 290In the event of the cylinder starting valve leakage ________ would pass into the air pipes and ignite the
291In the four-stroke engine, it takes ________ to make one power stroke.one propulsion two propulsions two revolutions one revolution C
scavenging air ports exhaust ports fuel valves indicator-cocks A 292In the part of the cylinder liner inside the scavenging air box there is a series of openings known as ___
piston crown piston ring groove piston skirt piston ring area D 293In the sentence ―In some designs the cylinder oil is timed so that the oil injects only on the piston ring b
by an fuel valve through an inlet valve with an exhaust valve from an outlet valve B 294In the suction stroke air is induced into the cylinder ________. In the compression stroke the air is com
295In the two-stroke engine, each revolution of ________ makes one power or working stroke.the turning gear the turbo-charger the crankshaft the compressor C 296In the two-stroke engine, inefficient scavenging and other losses reduce ________ to about 1.8.the output the oil flow the diameter the power advantage D 297In today's practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engine greater smaller better less A 298In two-stroke engine the crankshaft is connected with ________ by means of the connecting rod.the stuffing box the piston the cross-head guide plate C 299Increased air ________ will raise scavenge efficiency and allow a greater mass of air to be compresse specific volume density viscosity calorific value B 300Increasing differential pressure of an oil filter indicates that ________.it is dirty it is leaky it has been renewed all the above A 301Increasing the temperature of a fuel will reduce its ________.viscosity pressure resistance setting point A
A 302It is abnormal that when the engine is being turned by the turning gear ________ or by hand.water discharges from the indicator cocks no water is leaking into crankcase no water in the scavenge belt the rpm is lower than the speed of Dead Slow 303It is important that the two condensate drain cocks, fitted to the underside of the air chest, ________ u remain open remain close retain open retain close A 304It is important that the water ________ very often as this can lead to increased deposits.not be changed be changed should not be changed should be changed A 305It is important to use only pure lead and to choose a thickness of wire which is greater than the normal not less than twice greater at least twice than not greater twice than larger three times than C 306It is necessary for us ________ after having served for a certain period.to change the lube oil have the lube oil purified have the lube oil burnt to analyze the lube oil D
continuously regularly constantly period C 307It is necessary to ________ cool the various components of the machinery so that the engine can work
308It is necessary to remove ________ from the cooling spaces.scar scale spur bilge B 309It is necessary to remove ________ from the cooling water spaces to improve heat transfer.lime frost scale scar C
economical expensive inexpensive loss B 310It is relatively ________ to drive the compressor directly from the engine by chain / or other mechanism
311It is usual to give the main diesel engine a brief trial on power ahead and astern before ________.the indicator cocks are closed―Stand By‖ is rung on the engine telegraph the engine is turned on by putting in starting the steering gear is checked B
well good excellent respectively A 312It is very important that each cylinder should be ________ scavenged before the charged air is compre
313It is very necessary that each cylinder ________ before the charged air is compressed.is scavenged is atomized with fuel oil be scavenged be atomized with fuel oil C 314It is very necessary that each cylinder ________ before the charged air is compressed.is scavenged has been scavenged be scavenged was scavenged C 315It is well known that good lubrication will ________ the bearings from becoming overheated.present prevent avoid provide B 316Keep compartment ________ as the gas given off can be dangerous.well ventilated well clean in good order more room A 317Lack of combustion air may be due to ________.fouling turbine fuel pump faults lubrication failure excessive cooling A 318Large marine diesel engines of crosshead construction generally have two systems of lubrication: a tot Cylinder liners and piston rings main bearings crankpin bearings turboblower A 319Leaky exhaust valve will result in which of the following? ① high exhaust temperature; ② low compression pressure; ③ low firing pressure.
① and ②① only② only①, ② and ③D
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320Low compression of diesel engine may result from ________. a worn cylinder broken piston rings any of A and B none of the above C 321Low compression results from ________. a worn cylinder broken piston rings either A or B none of the above C 322Lubricating oil for an engine is stored at the bottom of the ________, known as the sump or in a drain sea cheat air receiver crankcase water box C 323Main bearings are required to support the crankshaft at each ________.end web pin journal D 324Marine four-stroke diesel engines are mainly ________.of crosshead type of trunk piston type of low speed type all the above B 325Measure ________ by means of lead wire.the clearance of the main bearing the play of the roller bearing the gap of the main bearing the tolerance of the main bearing A 326Measure ________ by means of lead wire.the clearance of the main bearing the diameter of main bearing the hardness of main bearing the tolerance of main bearing A
diameters lengths deflections none of the above C 327Misalignment of an engine crankshaft can be detected by measuring ________ of crank webs for each
are made of are made from make use of are used to C 328Modern engines ________ exhaust gas driven turbo-chargers to supply pressurized fresh air for scave
make use of have made the use of by means of make advantage of A 329Modern engines ________ exhaust gas driven turbo-chargers to supply pressurised fresh air for scave
scavenging starting cooling blowing A 330Modern engines make use of exhaust gas driven turbo-chargers to supply pressurized fresh air for ___
331No specific period is given for the renewal of the lubricating oil filter element as this should be done __whatever whenever wherever whoever B 332Oil is supplied to the cylinder wall and ________ by means of mechanical lubricators.the cylinder cover the piston rings the piston crown the piston skirt B
lower than / can lubricate lower than / can cool higher than / can enter higher than / cannot enter D 333Oil pressure in the lubrication system is ________ the static sea water head to ensure that sea water _
334Oil will lubricate these parts ________ effectively than water.much more most less B
C 335On a diesel engine, a fresh water cooling is used rather than a salt water one to ________.maintain fuel oil temperature maintain lube oil temperature cut down rust and corrosion keep the engine block from freezing in clod w 336On a diesel engine, fuel is delivered into the combustion space by ________. a cooling system a lubrication oil system an electric system an injection system
D 337On a four-stroke diesel engine, when the piston is driven downwards by the expanding gas, it delivers thrust block sounding rod connecting rod push rod C 338On opposite ends of a single shaft of a turboblower are a gas driven ________ and a air compressor, charge air receiver scavenging air belt turbine air cooler C
the camshaft the flange the ridge the bulge B 339On the top of the cylinder is mounted the cylinder cover which is pressed onto ________ of the cylinde
340On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as _______cooling jacket cylinder liner piston crown cylinder cover A
a hydraulic governor an electrically auxiliary blower control valves electric motors B 341On two-stroke diesels ________ is usually provided because the exhaust gas driven turbo-blower cann
342On two-stroke diesels an electrically auxiliary blower is usually provided because the exhaust gas drive reduce the temperature of pistons increase its density increase its temperature reduce the fuel viscosity B 343Once a fire is detected the engine should be slowed down, On no account ________.the trunking should be opened up should the trunking be opened up the trunking should not be opened up should the trunking not be opened up B 344Once a scavenge fire is detected the engine ________.will be speeded up should be slowed down must slow down have to be slow down B
to protect to guard to maximize to minimize D 345Once a scavenge fire is detected, fuel should be shut off from the affected cylinders and cylinder lubric
346Once all cylinders are firing regularly, ________ is shut off.the exhaust valve the starting air the inlet valve the fuel oil B 347Opening of the cylinder ________ will admit compressed air into the cylinder.safety valve indicator cock blow-down valve start valve D 348Operating conditions in the crank chamber are very ________ those in the cylinder.the same as similar to separated from different from D 349Persistent knocking in one cylinder of a diesel engine could be caused by ________. a low load on that cylinder sluggish piston ring action excessive piston crown cooling excessive clearance of piston pin D 350Piston No. 2 of main engine has been removed, and it will be ________ by noon tomorrow.lifted reassembled dismounted disassembled B 351Pistons may be made in ________ in order to keep the weight down for balancing purposes at high sp cast iron forged steel stainless steel aluminum alloy D 352Pistons of marine medium speed diesel engines may be made of ________ in order to keep the weigh lead forged steel alloy steel aluminum alloy D 353Please draw out a 0.1mm ________ between the two halves of the bearing to reduce the clearance.shim gasket washer packing A 354Please draw out a 0.1mm shim between two halves of the bearing ________ the clearance.to reduce to increase and reduce and increase A 355Pumps and fine filters are arranged ________ with one as standby.in duplicate in double at twice for two A 356Put in the engine turning gear. Now examine thoroughly inside the crankcase to ________ that everyth make sure be sure assure believe A
automatic local remote manual C 357Remote control means that the system is being controlled by the operator who is situated ________ fro
358Rotating flyweights acting against spring pressure make a simple type of ________.governor safety valve reducing valve feed water regulator A 359Scavenging is ________ of exhaust gases by blowing in fresh air.the suction the compression the removal the deliver C 360―Scavenging‖ on a diesel engine means ________.injecting fuel oil into a cylinder removing exhaust gases from the cylinder forcing air into the cylinders under pressure a combination of all the above B 361Sea water is not directly used as a coolant for engines because of its ________.low specific heat corrosive action high expense acid property B 362Sea water is not used directly as a coolant because of ________.low specific heat high specific heat corrosive action high viscosity C 363Sealing between the crankcase and scavenging air boxes for a two-stroke diesel engine is achieved by the connecting rod stuffing boxes the rings in the stuffing boxes the sealing rings of piston the scraper rings of piston B 364Sediment collects in a tubular purifier ________.on top cover on sides of bowl in drain line on the discs on the discs B 365Shims of different thicknesses are inserted between the shells to enable adjustment of ________.the bearing clearances the bearing thickness the bearing strength the bridge hardness A
a fire-tube boiler an internal combustion engine an external combustion engine an internal combustion generator B 366Since the burning or combustion takes place within the engine itself, the engine is known as ________
367Smaller engines can be made more rigid than large ones and may not have ________.connecting rods crankshaft crankcase through bolts D 368Smaller engines can be made more rigid than large ones and may not have ________.through bolts dividing walls sloping surfaces relative angles A 369Smaller engines can be made more rigid than large ones and may not have ________.through bolts turbo-chargers bed plates columns A 370―stand by engine‖ means ________.prepare to stop the engine assemble an engine on its bedplate make an engine ready for starting make an engine run steadily C 371strainers and fine filters should be cleaned at intervals, ________ prevent dirt from getting under a fue in order that so as to so that in addition to B 372Such an engine frame helps ________ the engine and so protect the bearings from the deformation fo to stiffen to soften to loosen to wear A 373The ________ of the main shaft should be measured with a ________.clearance / calipers sinking / bridge gauge diameter / bridge gauge clearance / lead wire B
four-stroke two-stroke slow speed reversible A 374The ________ engine is used for alternators and some times for main propulsion with a gearbox to pro
375The ________ is not properly set thus causing either advanced or retarded firing.piston fuel injection pump crankshaft oil can B 376The ________ of the diesel oil must not exceed 120 degree Fahrenheit.temperature pressure acid valve viscosity A 377The ________ of the lubricant should be sufficient to hold the film together, but it should allow the lubr specific gravity viscosity acid value calorific value B 378The ________ chamber is enclosed between the cylinder head and piston.lubrication injection cooling combustion D 379The ________ or balance tank collects the re-circulated fuel oil.buffer sump bilge overflowing A 380The ________ or balance tank collects the re-circulated fuel oil.overfowing sump bilge buffer D
needle valve nozzles piston spring A 381The ________ in the injector will lift at a pre-set pressure which ensures that the fuel will atomize once
382The abbreviation ―MIP‖ stands for ________middle indicating pressure mean indicate pressure mean indicated pitch middle indicated power B 383The abbreviation BDC means ________.Boston Diesel Company base circle diameter switch board case bottom dead center D 384The abbreviation TDC means ________.top dead center temperature difference center time delay clock top diesel company A 385The aftermost tunnel bearing has ________ because it must counteract the propeller mass and take a only a lower half bearing shell only a top half bearing shell a top and bottom bearing shell no any bearing shell C 386The amount of lubricating oil in the drain tank should be checked by ________.measuring sounding rod metering weighting B 387The auxiliary engine and a. c. generator can be connected with ________.cam crosshead bulge coupling D 388The bearing shell generally has ________ for location and oil grooves round the center of its axial leng tips tags lips keys B 389The bearing shells depend on the accuracy of ________ to held them in a truly circular shape.the gap the clearance the bore the housing C
bed-plates girders bearing housings consists B 390The bedplate is of fabricated design and consists of two I-shaped longitudinal girders with transverse m
391The bed-plate is secured in the longitudinal direction by means of blots known as ________.end-chock blots side-chock blots through bolts tie rods A 392The bore of each cylinder is formed in a liner which can be ________ when worn out.welded replaced drilled again bored B 393The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine pis crank-pin crankshaft crankcase camshaft B 394The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine pis the burning the fuel the air charge the engine piston C 395The burnt gases force the piston to do work on the crankshaft which ________ drives the ship's prope in turn turn in in turns turns in A 396The cap and new shell are tightened up and then removed and the thickness of the wire measured by a bridge gauge a micrometer a thermometer a indicator B 397The carbon deposits on the piston crown and in the ring grooves ________.should be scraped should be derusted should be drilled out to be brushed off A 398The casing of the independent thrust block is in two halves which are joined by ________.through blots jack bolts tie bolts fitted bolts D 399The cast iron ________ for the cross-head are attached to the top section and seal off the crankcase.cylinder cover cross-head shoes guide-ways scavenging boxes C
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400The cast iron guide-ways for ________ are attached to the top section and seal off the crankcase.the connecting rod the cross-head the piston rod the air box B
the chain drive casing the strong cast iron frame the scavenging air box the fabricated casing A 401The chain transmission, forming the connection between the crankshaft and the camshaft, is enclosed
402The cleaned heated oil, after passing through the centrifuges, is to be pumped to a ________.settling tank service tank ballast tank drain tank B 403The common method of applying oil to the cylinder walls is by means of small pump assembled in unit mechanical lubricator lubrication function forced feed system bearing lubrication A
tap-bolts jack-bolts tie rods fitted rods C 404The complete assembly of bedplate, A-frames and cylinder block is held together by ________ to from
405The compressed air is admitted to each cylinder through a cam operated by starting air valve when the BDC TDC BBDC ATDC B 406The compressed air is supplied by ________ to the air https://www.doczj.com/doc/1e17804075.html,pressors forced fans ventilators generators A 407The conclusion that mechanical efficiency is always ________ 100 per cent is correct.small than more than little than less than D
connecting rod piston rod bearing housing none of the above C 408The connecting rod large end bearing shell generally has tags for location and oil grooves round the ce
409The cooler as the liquid becomes, ________.the faster it will evaporate the slower it will condense the slower it will evaporate the faster it will flow C 410The cooling liquid used for the cylinder may be referred to as ________.jacket water make-up water boiler water flushing water A 411The cooling of the piston is carried out by circulating ________ across the underside of the crown and sea water scavenging air lubricating oil fuel oil C 412The cooling oil is usually supplied to the pistons by means of ________ connected to the crosshead.i njectors pumps telescopic pipes guideways C 413The cooling water is in direct contact with the outer surface of the liner as a result of which it is termed water liner wet liner dry liner drown liner B 414The cooling water jacket is common to all the cylinders but there are often ________ to ensure that ea dividing walls divided walls dividing liners divided jackets A 415The cooling water temperature ________ over a period of 8 hours, and then shut down.should be gradually increased should be gradually reduced should be constantly kept should be varied up and down B 416The correct tightening is obtained by use of ________ to measure the extension given to the bolts.pressure gauges stretch gauges thermometers bridge gauges B 417The cracks at scavenging ports must be remedied by ________.grinding welding scrapping metalock D 418The crank chamber oil ________.can be recovered is only supplied to cylinders only feeds the main bearing is a kind of detergent A 419The crank pin journal is provided with large bores for ________.lubrication cooling balancing purpose ventilation C 420The crank throws are displaced from ________ to obtained the same number of degrees between the one another the other each other each others C 421The crankcase can not be opened ________ the parts have been cooled down.if as unless when C 422The crankcase cover should never be allowed to open for investigation when ________.the engine stops the engine is running you repair the engine overhauling the engine B 423The crankcase is closed fore and aft by two vertical plates with circular inspection holes provided with guide ways inspection doors brackets main bearings B 424The crank-pin bearings are made of ________.alloy steel resistance heat steel cast steel cast iron C 425The crank-room cover should not be opened until at least ________ minutes after the engine stops.10152030B 426The crank-room cover should not be opened until at least ________ minutes after the engine stops.one fifteen sixty ninty B 427The crankshaft deflection is at first to be ________ before and after repair.disassembled renewed measured regulated C 428The crankshaft is of the semi built type, with the journal ________ the forged or cast steel crank throw being shrunk into to be shrunk into to be shrunk with shrinking into A 429The crankshaft is of the semi built type, with the journal ________ the forged or cast steel crank throw shrunk into expanded into extended into designated into A 430The crankshaft is of the semi-built type, with the ________ being shrunk into the forged or cast steel c journal crank-pin main bearing large end of connecting rod A 431The crankshaft of diesel engine is supported by ________.tension stretch tie rods through bolts main bearings D 432The crankshaft receives and transmits the full working power of the engine and is subjected to fluctuat bending stresses torsion stresses shear stresses All of the above D 433The crankshaft rests in bearings built into cross girders of ________.A-shape frame cylinder block the bed-plate the double bottom A 434The crankshaft should be turned by means of ________ to see that all parts move freely. a steering gear a chain gear a turning gear a sever motor C 435The crankshafts of medium speed engines are almost invariably solid ________ from a single piece of forged cast made shrunk A 436The cross-head and crank pin bearings are secured to the ________ by means of fitted bolt.cross-head guides cross-head shoes piston rod connecting rod D 437The cross-head pin bearings are white metal lined shells lubricated by means of ________.low pressure pumps centrifugal pumps high pressure pumps mechanical compressors C 438The cross-head shoes are ________ lined.chromium steel white metal alloy steel white silver B 439The cross-head shoes are white metal ________.lining lined made in B 440The cross-head shoes are white metal lined grooves being cut ________ in the face of the white meta horizontally vertically slantingly crosswise A
an adequate supply of lube oil an adequate supply of fuel oil an adequate supply of turbine oil an adequate supply of cylinder oil A 441The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white me
442The crown is fairly thick with the cylindrical parts ________ to a thinner section forged tapering drilling boring B
repeatedly quickly gradually immediately C 443The cylinder and piston must be warmed up ________ to a temperature of about 140 deg. F in standin
444The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at _______
the beginning of the compression stroke the beginning of the suction stroke the end of the working stroke the end of the exhaust stroke A 445The cylinder cover is not provided with ________.fuel valve lubricator indicator valve the starting valve B 446The cylinder covers and the liners are bolted together by means of ________.bolts welded into the cylinder head bolts welded into the cylinder frames studs screwed into the cylinder head studs screwed into the cylinder frames D
screwing into being screw on to screw on screwed into D 447The cylinder covers and the liners are bolted together by means of studs ________ the cylinder frames
448The cylinder head, cylinder liner and ________ form the combustion chamber.frame piston crankcase explosion plate B
around among in between D 449The cylinder is fitted with internal liner so that a water space is left ________ the liner and the outer wa
450The cylinder liners are made of ________ and the cylinder surfaces are sometimes chromium-plated.steel copper cast iron stainless steel C 451The cylinders, with cooling jackets, are ________ to the engine frame by eight tie rods.screwed welded fastened rotated C 452The design of ________ is similar to that of the main bearing.the block bearing the camshaft bearing the connecting rod small end bearing the connecting rod large end bearing D 453The design of the connecting rod large end bearing is similar to that of the main bearings. What's the m
the connecting rod large end bearing the main bearing the design D 454The development of ________ has kept pace with the increasing demands made by the steady rise in water fresh air oils gases C 455The diameter of the crank-pins should be measured with a ________.salinometer thermometer tachometer micrometer D
water oil scale ridge B 456The diameter of the gravity disc is too big. It causes oil to flow through the water outlet. We changed th
457The diameters of the crankpins should be measured using ________. a micrometer a bridge gauge a spanner a wrench A 458The diesel engine is a type of ________.turbine engine gas turbine steam engine internal combustion engine D 459The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, h
air bottle air compressor crank case combustion chamber D 460The diesel engine must be started before it can run by itself. For this purpose ________ has to be use a starting system the starting air a starting operation A, B and C D 461The diffuser prevents pressure pulses from one cylinder ________ another during operation.to interfere with interfering with to help scavenging helping scavenging B 462The distance from TDC to BDC of the diesel engine is called ________.gap clearance radius stroke D 463The efficiency of turbocharge system is increased by fitting a charge air cooler ________ the compres inside before after against C 464The energy for pushing this piston up can be supplied from ________, so that the piston can keep mo the same piston the piston nearby the other piston the generators on board C
the priming pump the transfer pump the hydraulic pump injector pump A 465The engine fuel oil system should be primed by using ________, and the system cleared of air by mea
466The engine has one or two group of fuel pumps, depending upon ________.the number of fuel valves the number of cylinders the speed of engine the power of engine B 467The engine is reversed by axial displacement of the camshafts. In order for this to be carried out, the c lathed shaped shrunk developed B 468The engine is started with ________ supplied from air receivers.pressure oil pressure water compressed air cooling water C 469The engine may lose power or slow down during running, when this occurs, the first cause possible m c rack knocking leaking seizure D 470―The engine not obtaining the sufficient speed for firing‖ means that ________.the start fails the fuel pumps will be put into operation the fuel valves are damaged the combustion process will take over A
there is enough air in the air reservoirs the air is supplied into the cylinders in the ap all of the above D 471The engine will fail to start unless ________.the pressure of the starting air is high enough
472The exhaust gases for a new engine should be ________ when the engine operates under full load.smoky a little bit dense visible almost invisible D 473The external circumference of a pair of main bearing shells is slightly ________ that of the bore of the less than lighter than larger than smaller than C 474The external circumference of a pair of main bearing shells is slightly ________ that of the bore of the less than lighter than larger than smaller than C 475The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the nip nap gap lip A
ignition ratio power ratio compression ratio injection ratio C 476The figure that the volume of air at B.D.C. is divided by the volume of air at T.D.C is termed as ______
477The film of oil between the rings and the liner is not only essential for the lubrication but also plays an i an oil seal removing heat a gas seal cooling the piston C
play a great part on run a role in plays an important part in acts as important part at C 478The film of oil between the rings and the liner is not only essential for the lubrication but also ________
479The fine filters will be arranged ________ one can be cleaned while the other is operating.in order to because of so that so as to C
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480The four strokes are called suction, compression, expansion and exhaust, but only ________ stroke p Suction compression expansion exhaust C 481The four-stroke engine is used for ________ and sometimes for main propulsion with a gearbox to pro alternator turbo-charger remote controller windlass A
tank table trim water contents oil pressure C 482The fourth engineer accompanied by the workers on oil barge measures the oil levels, temperature and
483The fresh air coming in through the inner air ports, is compressed by ________ to a higher pressure.the cylinder head the cross-head the moving piston the stationary piston C 484The fresh air is compressed and then stored in ________.scavenging air receiver starting air bottle stuffing box charging air receiver B 485The fuel injector injects a fine spray of fuel into the hot air and combustion ________ producing much has begun takes place occurs happens B 486The fuel injector pump is operated by ________ which drives the plunger up and down. a separate motor a cam a generator a chain B 487The fuel is supplied to the pump through ports or openings in the ________ or cylinder of the pump.bottle injector piston barrel D 488The fuel oil system for a diesel engine can be considered in two parts-the fuel supply and the _______fuel treatment fuel combustion fuel injection fuel separating C 489The fuel pipes and ducts should be blown with ________.atmosphere the fresh water compressed air chemical compounds C 490The function of a lubricating oil is ________ to lubricate the running surface ________ to carry away a
not / but neither / nor either / or not only / but also D 491The gas loads on the engine structure are constrained by means of hydraulically preloaded ________ connecting rods main bearing column tie rods D 492The governor of a generator engine is to ________.make the engine stop regulate the timing of camshafts make the rpm stabilize at any required value make the engine run at nearly constant spee D 493The gudgeon pin is carried in ________ in the piston skirt.the bearing the crosshead bosses bridges C 494The hand steering is a method by which the motion of the rudder is controlled with ________. a motor-driven steering wheel a pneumatic steering wheel a hand-driven steering wheel an electric steering wheel C 495The heart of the diesel engine is the ________ where the fuel is burnt and the power developed.crankcase cylinder scavenge box piston B 496The high pressure in fuel injection system of the diesel engine is produced by the ________.injector pump fuel injector governor turbocharger A 497The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power the oil separator the fresh water generator the compressor fire pump C 498The hydraulic ________ is used to control engine speed.motor pump governor capstan C
vacuum pressure specific gravity heat viscosity C 499The ignition of the fuel in diesel engine is caused by the ________ of compression of the air previously
500The indicated power of an engine can be obtained by taking the ________.precautions rpm indicator cards B and C D 501The indications of a scavenge fire are excessive black smoke, ________ and peeling from scavenge tr turbo-chargers spark seen from the drains paint blistering all above are right D 502The injector pump is operated by a cam which drives ________ up and down.the needle valve the plunger the piston the cylinder B 503The injector pump is operated by a cam which drives the ________ up and down.piston drum plunger barrel C 504The injector pump is operated by a cam which drives the plunger ________.top and bottom to and fro up and down back and forth C 505The inner part of the condenser should be cleaned with ________.gas oil diesel oil chemical compound Freon-12C
as far as as soon as as close as as closer as C 506The interface between the liquid seal (water) and the oil should be positioned ________ possible to the
507The joint face between the cylinder cover and the liner is arranged ________ the combustion process such far away from such near by as far away from as near by C
lubricating oil compressed air cooling water sealing ring C 508The loss of ________ from an air compressor could lead to an overheated air discharge and possibly a
509The lower end of each piston rod is ________ in diameter to fit bore in the crosshead, this being secur increased constant reduced variable C
piston gudgeon pin piston skirt cross-head cross-head pin C 510The lower end of each piston rod is reduced in diameter to fit a bore in the ________ this being secure
511The lower end of each piston rod is reduced in diameter to fit a bore in the cross-head, this being secu a bolt a cap a disc a nut D 512The lower end of each piston rod is reduced in diameter to fit a bore in ________, this being secured t the crank-web the connecting rod the main bearing the cross-head D 513The lower end of each piston rod is reduced in diameter to fit a bore in ________.the crosshead the journals of the crosshead the crosshead shoes the guides A 514The lowest ring of a piston is ________. a coil spring a sealing ring an oil distributor ring main seal ring C 515The lube oil in the bearings is drawn from a ________, usually located in the bedplate.tank sump vessel bottle B 516The lubricating oil is pumped from the drain tank, very often with ________ in the suction line. a filter a strainer a magnetic filter a fine strainer C 517The lubricating pipes and dusts should be blown out with ________.atmosphere the fresh water compressed air chemical compounds C 518The lubricating system for the cylinder walls is different from the bearings in that the oil for former one sufficient quantity / measured measured quantity / sufficient excessive quantity / sufficient the less quantity the better / the more the bet B 519The machine has stopped rotating because the bearing ________ the shaft.seized clogged melted inserted A 520The main bearing metal is a lining ________.inside the bearing outside the bearing covering the crankshaft none of the above A 521The main bearing shells are made of steel with a lining of bearing metal which may be white metal, cop
main bearing shells main bearing steel bearing metal D
flange flash plate sheet B 522The main bearing shells often have a thin ________ of lead or indium to provide a layer giving protectio
523The main bearings are provided with thin-walled ________, lined with a copper-lead alloy.steel guides steel shells steel bearing caps pig iron B 524The main factor determining the output of each cylinder is the cylinder ________.density bore weight material B 525The main factor which determines the output of each cylinder is ________.the cylinder weight the cylinder bore the cylinder length the cylinder cover B
the information the formation the scatter the friction B 526The main function of the lubrication system is to enable ________ of a film of oil between the moving p
527The main moving parts of a diesel engine consist of the ________ and the pistons.bedplate, connecting rods crankshaft, the connecting rods frames, crossheads crankshaft, the cylinder B
two-stroke four-stoke long-stroke short-stroke B 528The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate
529The marine diesel engine is a type of diesel engine used on ships. The ________ of its operation is no principle principal cause case A 530The mechanical efficiency of an engine ________ because losses occur in the form of friction.is always less than 100%is always more than 100%is always equal to 90%is always less than 90%A 531The most common cause of lowering the crankcase lube oil flash point is ________.more water contents contamination with fuel oil higher temperature sufficient cooling of oil mist B
be jammed be opened be seated be broken C 532The needle valve in a fuel valve will ________ when the fuel pressure action on the needle valve tapere
533The needle valve in the injector ________ at a pre-set pressure which ensures that the fuel will atomis will lift will be lifted will close will be closed A 534The needle valve will open when the fuel pressure acting on the needle valve ________ exerts a suffic tape face tapered face surface thinner face B 535The oil cooler is circulated by sea water, which is ________ than the oil.with a higher pressure at a lower pressure no more pressure in a greater pressure B 536The oil is drawn from a drain tank through ________, one of a pair of pumps, into one of fine filters.a strain tank a head tank a service tank a strainer D 537The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree invade provide detergent neutralize D 538The oil quantity for bearing lubrication should be applied in such amount as to be sufficient to carry aw acids additives heat gear C 539The oil was pumped up in the settle tank such a height that it ________.spilled overflowed sprayed injected B 540The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil t to be kept logged changed has remained B 541The operation between two fuel injections is called a ________.turning cycle working cycle working hour working stroke B
a working cycle the operation two fuel injections events A 542The operation between two fuel injections is called a working cycle, which consists of a fixed sequence
543The outside diameter of the pipe is ________ the diameter of the bore of the piston rod, the result bein less than greater than equal to twice larger than A 544The outside diameter of the pipe is ________ the diameter of the bore of the piston rod, the result bein less than greater than equal to twice larger than A 545The period of valve overlap is when ________.the inlet valve is open the exhaust valve is open both valves are close both valves are open D 546The period when both inlet valves and exhaust valves are open is referred to as ________.valve loop valve uniflow valve overlap valve grinding C 547The piston are cooled by oil supplied from the forced ________ system.fresh water sea water lubrication fuel oil C 548The piston cooling system may employ similar components, except that ________ is used instead of a a sump tank a feed well a double bottom tank a drain tank D 549The piston cooling system may employ similar components, except that a drain tank is used instead of doesn't use a drain tank but a head tank uses a drain tank not head tank uses a drain tank and a head tank uses neither a drain tank nor a head tank B 550The piston forces are transmitted over the entire length of the cross-head pin then to ________ via the the piston rod the crank arm the fly wheel the connecting rod D 551The piston moves up and down, thus causing the rotational movement of the ________.crankshaft connecting rod cross-head main bearing A 552The piston moving up and down keeps the crankshaft ________.to revolve revolved revolving to be revolved C 553The piston ring grooves for a standard engine are ________.chromium-plate against wear anti-corrosion treated white metal lined against wear flame hardened against wear D 554The piston rings are manufactured with a diameter ________ the bore of the https://www.doczj.com/doc/1e17804075.html,rger than smaller than equal to none of the above A 555The piston rings if found worn out ________ and supplied by shipchandler.must replace must to be equipped has to be repaired have to be renewed D 556The piston rods are bored from the top flange to a point opposite the centre of ________.the main bearing the crankshaft the dowel pin the crosshead D 557The piston supporting body is mainly subjected to ________ stress.pushing centrifugal stretch compressive D 558The pistons are cooled by oil supplied from the forced ________ system.fresh water sea water lubrication fuel oil C
screwed bolted welded shrunk B 559The pistons of high output engines are often made in two pieces ________ together to form precisely s
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crankshaft camshaft piston rod rack and pinion B 560The plunger in the fuel injector pump, usually operated by a ________, is driven up and down when wo
561The plunger may be rotated in the barrel by a rack and ________ on a sleeve which is keyed to the plu pinion arrangement push rod handle bar cam device A 562The ports are drilled in the liners at an angle of approx. 20°, the result being that ________ is given a r the scavenging air the exhaust gases the mixed air the spray oil A 563The position of ________ on the cross-head is determined by dowel pins.grooves piston rings piston skirts cross-head shoes D 564The position of ________ on the crosshead on a large diesel engine is determined by dowel pins.the guideway the piston rod the crosshead shoes the interlocked circlip C 565The position of the interface between oil and water within the centrifuge is achieved by the use of ____gravity disc centrifugal bowl a stack of discs main sealing ring A
a mark a bolt a dowel pin a measuring tool C 566The position of the piston parts in relation to each other is secured by means of ________ in the crown
567The position of the piston parts in relation to each other is secured by means of ________ and a dowe bosses through blots machine-turned recesses long studs C 568The power generated in the turbine must ________ that required by the compressor.be less than be larger than be as large as not be so large as C 569The pressure of pilot air is usually ________ than that of starting air.higher lower low high B 570The pressurized air is usually cooled to increase the charge air ________.viscosity density velocity electricity B 571The primary duty of lube oil is to reduce ________ between the working parts of an engine.power output friction and wear indicated pressure rated horsepower B 572The principle of hydrostatic lubrication has been applied to the cross-head using ________.high pressure lubricators tie rods fuel injectors fuel valves A
behind far from adjacent to in front of C 573The process of loop scavenge is that exhaust will be via ports ________ the air ports and controlled by
574The process to remove exhaust gases by blowing in fresh air is called ________.charging supercharging starting scavenging D
wheel crankshaft running gear cam D 575The projection on a shaft designed to change circular motion into up and down or back and fore motion
576The propeller screws through the water in much the same way ________ a bolt screws through its nut like alike as seem C
the pump cylinder the pump cam the pump plunger the pump roller C 577The pump has a constant stroke and the amount of fuel delivered is regulated by rotating ________ wh
gear nonpositive displacement positive displacement rotary C 578The pumps employed on board ship can be divided into two main categories i.e. ________ pumps and
579The pumps press oil into the crosshead bearing gap when the load on the shell is ________.at its highest with its greatest increasingly larger at its lowest D 580The pumps press oil into the cross-head bearing gap when the load on the sell is at its lowest. What is the cross-head the pumps the shell the load D
provide a belt-driving surface for the operatio prevent the engine from overspeeding B 581The purpose of the flywheel of a diesel engine is to ________.counterbalance the crank throws on the cran keep the engine running smoothly between pow
582The quantity of oil injected into the cylinder can be regulated ________.by turning the pump plunger by vary the fuel valve spring force by no means by controlling the governor by enlarging or diminishing the injection hole A 583The remaining oil in the lubricating pipes and dusts should be blown out with ________.atmosphere the fresh water compressed air chemical compounds C 584The removal of ________ from lubricating oil will reduce engine wear and possible breakdowns.contaminating water contaminated additives contaminated fuel contaminating impurities D 585The rim of the piston may contain cut-out portions to accommodate ________ when the open.the gases the air the valves the injectors C 586The rising of the exhaust temperature in manifold pipe may NOT result from ________.too great a loading fouled turbocharger bad combustion excessive air D 587The scavenging air ports are located at ________ that they are just exposed by the upper edge of the so a height.such a height so high such high B
being bolted bolted bolting to be bolted D 588The scavenging box is built of a number of sections provided with vertical flanges enabling them _____
589The scavenging box is built of a number of sections provided with ________ enabling them to be bolte chain transmission machine-turned liners fuel valves vertical flanges D
nuts bolts coil springs stuffing boxes C 590The sealing rings are in four parts and pressed together around the piston rods by means of ________
591The selection of a lubricating oil depends to a great extent on the operating conditions, ________.the type of coolant the design of the engine the type of fuel to be burned B and C D 592The selection of an oil depends ________ on the operating conditions, the design of the engine and th to a great extent on a great extent on mainly on only A 593The selection of an oil from the ________ depends to a great extent on the operating conditions, the d commercially available commercially commercial available commerce available A 594The sequence of fuel injection into cylinders is determined by ________.the steering the driven gear the turning gear the timing gear D
①-②-④-③-⑤①-④-②-③-⑤①-③-②-④-⑤①-⑤-④-②-③B 595The sequence of parts in a generally used fuel oil supply system for a main engine is ________. ① tanks in the double bottom; ② centrifuges; ③ service tank; ④ settling tank; ⑤ viscosity regulator.
596The shells are secured by means of bearing caps and studs, the necessary clearance being provided shims packing glands washers A 597The slow speed main propulsion diesel operates on two-stroke cycle. At this low speed the engine requ
thrust blocks propeller flying wheel rudder B 598The slow speed main propulsion diesel usually operates on ________.the four stroke cycle the four-stroke cycle the two stroke cycle the two-stroke cycle D 599The space between cylinder liner and jacket is called ________.the circulating tank the scavenge box the cooling water space the cooler C 600The space between cylinder liner and jacket is called ________.the cooling water the circulating water the cooler the cooling water space D 601The starting air in the receiver is supplied by the ________.air compressor refrigeration compressor vacuum pump purifier A 602The starting air system usually has ________ to prevent starting of anything is not in order.drain cocks vent valves counteracts interlocks D 603The starting air system usually has ________ to prevent starting if anything is not in order.stop valves interlocks non-return valves air vents B 604The starting of a marine diesel engine is generally carried out with the assistance of ________.compressed air electricity hydraulic oil compressing air A 605The successful operation of any engine or machine and ________ depend on effective lubrication.their no trouble period their freely trouble period its free trouble life its trouble-free life D 606The supercharger takes air out of the surrounding atmosphere and then feeds it to the engine's _____inlet valves exhaust valves emergency valves non-return valves A
diesel engine stroke cycle compression ratio C 607The term ―________‖ refers to one complete sequence of operations required to produce power in an e
608The term medium speed diesel engine is currently taken to mean an engine with an operating rotationa below 300above 1200between 300 to 1200below 1200C 609The thrust block ________ the thrust from the propeller to the hull of the ship.conducts fits transfers carries C
fore end aft end ahead astern end B 610The thrust block or thrust bearing, located at the ________ of the engine, may be integral with, or sepa
one quarter a half three quarters four fifths C 611The thrust loading is carried by pads. In some designs the pads extend ________ of the distance arou
612The timing for each starting valve must be set so that it opens when the piston is ________.just past the TDC stopping close to BDC on the way upwards A 613The timing of the injection can be altered by raising or lowering the pump ________ in relation to the c needle valve cylinder piston plunger B 614The transmission system is made up of shafts, bearings, and finally the ________.thrust shaft propeller reduction gear box train transmission B 615The turbo-blower comprises a gas turbine and a ________.condenser blower soot blower air receiver B 616The two halves of connecting rod large end bearing are held together by ________.bridges tap blots jack bolts shims A 617The two-stroke cycle begins with the piston ________, with the air inlet ports or scavenge ports in the coming down from the B.D.C coming up from the B.D.C coming down from the T.D.C coming up from the T.D.C B 618The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with ________ in scavenge ports inlet valves air starting valves exhaust valves A 619The two-stroke cycle begins with the piston coming u from the bottom of its stroke, with scavenge port shut closing opened closed C 620The two-stroke cycle begins with the piston ________, with the air inlet ports or scavenge ports in the coming down from B.D.C coming up from the B.D.C coming down from the T.D.C coming up from the T.D.C B 621The upper end of the cylinder liner forms a ________ of sufficient strength to support it.rectangle bore flange coupling C 622The use of a poor quality piston cooling oil can lead to rapid deterioration of its properties with the resu advantage superior increase reduction D
heavy oil lube oil fuel oil diesel D 623The vessel is out of harbor and in ―Full Ahead‖. We are going to run fuel oil instead of ________ and o
624The viscosity regulator controls ________ in order to provide oil at the correct viscosity for combustion the engine's speed the engine's load the fuel oil temperature the fuel oil flow C
temperature pumping rate pressure heat A 625The viscosity regulator controls the ________ of the fuel oil in order to provide the oil at the correct visc
in order that because of in order to owing to C 626The viscosity regulator controls the fuel oil temperature ________ provide oil at the correct viscosity co
627The way to reduce ________ is to build up a film or lubricant between any two surfaces that rub again friction collision inertia resistance A 628The withdrawing of the cylinder liners, in general, depends on their ________. This may amount to app
correct maneuvering wear working efficiency maintenance B 629The words such as quantity, grade, viscosity and specific gravity should be in the ________.repair list spare parts order list price list bunker list D 630The work fuel does in each working cycle can be obtained by taking the ________.precautions rpm indicator cards B and C C 631The working cycle of a four-stroke diesel engine consists of four events: ① compression; ② expansion; ③ exhaust; ④ suction. The correct sequence is ________.
④-②-③-①④-③-①-②④-③-②-①④-①-②-③D 632There is ________ in any water cooling system for a diesel engine allowing for expansion and water m a setting tank a service tank a head tank an expansion joint C 633There is ________ in any water cooling system for a diesel engine allowing for expansion and water m an expansion joint a service tank a head tank a setting tank C
recirculating total loss cooling refrigeration A 634There is a ________ system lubricating the running gear and cooling the piston and sometimes lubrica
635There is an injection pump for each cylinder, which usually operated once every cycle by ________ on a gear a cam a rod a roller B 636There may be steam coils in a cylinder cooling water system. ________ during operation of the engine Steam should be cut off Steam should pass through the coils Electric should supplied to the coils The coils should be dismantled A 637There should be a lubrication oil ________ between the main bearings and the crankshaft.film cap lacquer shell A 638These piston rings are so badly worn that they must be ________.renewed welded machined chromium-plated A 639They understand the ________ of automatic sludge discharging of the purifier. But they are not good i principle principal cause case A
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640This used piston had been tested and approved as a spare part by the ________ during last annual re agent shipchandler surveyor engineer C 641Those generally used additives for cooling water are either anti-corrosion oils or inorganic ________.g ases paints inhibitors detergent C
occurred occurring not happening occur B 642To avoid scavenge fires ________ the engine timing and equipment maintenance should be correctly c
643To avoid scavenge fires occurring the engine timing and equipment maintenance ________.should be correctly carried out should correctly be taken place should carried with care must to carry out with great care A
salinity alkalinity acid sanitary B 644To counteract these undesirable effects oils usually contain additives formulated to impart a high degre
645To prevent the build up of high stresses engine must not be run continuously ________.faster than dead slow speed slower than dead slow speed with the output of MCR at critical speeds D
flashing water operating oil flushing water sealing water C 646To start the ejection process the oil feed to the centrifuge is first shut off and the oil remaining in the bo
647Turbocharging of marine diesel engine is achieved by two distinct methods, ________ termed he cons respectable respectful respective respectively D 648Turbocharging system may be designed to operate on either the ________ or the constant pressure e pulse exhaust fluctuating hunting A 649Two-stroke engine turbocharging achieved by two distinct methods, ________ termed the constant an respectable respectful respective respectively D 650Two-stroke engines invariably have ________ to admit air when uncovered by the descending piston.inlet ports outlet ports inlet valves exhaust valves A 651Under manoeuvring condition the main engine may run on ________.gas oil M.D.O residue oil crude oil B 652Uniflow is the most effcient scavenging system but requires ________ an opposed piston arrangemen neither / nor both / and either / or not only / but also C 653V.I.T. means ________.variable injection timing variable inlet tonnage vertical incoming tonnage vertical inlet tank A 654Valve gear knocks are more easily located while the engine ________.is running stops is repaired lacks of oil A 655Valve overlap is the period during which ________.the inlet valve is open the exhaust valve is open both valves are closed both valves are open D 656Vee-type engines have the connecting rods from two cylinders connected to each ________ of the cra throw web main bearing deflection A 657Vents are led from the engine to ________ for the release of air from the cooling water.the cooling jackets the head tank the cooling water pump the scavenging box B 658Vents are led from the engine to head tank ________ from the cooling water.for the release of air for the release of water in order to the release of air because the release of water A 659Vents are led from the engine to the head tank for the release of ________ from the cooling water.air heat sludge steam A 660We call a ship equipped with a diesel engine as main engine ―________‖. a tug boat a salvage ship an oil tanker a motor vessel D 661We can control the speed of the engine by ________ the quantity of oil supplied.exchanging regulating adjusting differing from B 662We should start the engine unless the turning gear is ________.on disengaged bolted unscrewed B 663Wear in a cylinder liner is usually due to ________.friction abrasion corrosion all of the above D 664Wear in parts of exhaust valve operation gear will tend to ________ the tappet clearance.increase reduce rise reduction A 665We'd better take ________ to save fuel consumption, you know it would be useless to get there earlier nominal speed economical speed rated speed slow speed B 666What is used for measuring the main bearing?Pressure gauge Dial gauge Bridge gauge Power meter C 667What is used to purify water and foreign matters from the fuel oil in the following?Compressor Separator Evaporator Fuel pump B 668When ________ is operated, a supply of pilot air enables the remote valve to open.the distributor the air start lever the turning gear the cylinder air start valve B 669When ________ is compressed, its temperature rises so that it ignites the fine spray of fuel injected in the oil the air the fresh water the steam B
purifier separator filter clarifier D 670When a centrifuge is arranged to separate impurities and small amount of water from oil, it is known as
has to be handled may be handled has being handled will be handling A 671When a crankshaft ________ outside the engine, it should be carefully supported in a manner which w
672When a crankshaft has to be handled outside the engine, it should be carefully supported in a manner avoid imposing provide adequate avoid to impose provide with adequate A 673When a crankshaft has to be handled outside the engine, it should be carefully supported in a manner compressing interposing imposing pounding C 674When ships are in port, it is the time when opportunity ________ to carry out the routine maintenance occurs discovers looks for finds A 675When the engine speed slows down the governor will ________ the engine fuel pump setting.increase reduce keep none of the above A 676When the exhaust ports or valves are opened, the ________ begin to exhaust.carbon and water refrigeration steam burnt gases oil sludge C
top nip bottom middle C 677When the follower is on the base circle of the cam with a normal shape, the pump plunger is at the ___
678When the follower is on the base circle of the cam, the pump plunger is at the ________ of its stroke.top middle bottom any of the above C 679When the order ―________‖ is received from the bridge the main air stop valve should be shut.stand-by engine full ahead finished with engine ring off engines C 680When the order ―________‖ is received from the bridge, the main air stop valve in the starting air line s stand-by engine full ahead finished with engine full away C 681When the piston is pushed down, it forces the engine to do work on the crankshaft which in turn drives
the ship's rudder the ship's propeller the turning gear the thrust bearing B 682When the piston reaches the top of its stroke, the temperature of the air ________ to very high value.raises rises elevates arises B 683When the piston reaches the top of its stroke, ________ the pressure ________ the temperature of th either / or neither / nor both / and from / to C 684When the piston reaches the top of its stroke, both the ________ and the temperature of the air rise to density mass pressure volume C 685When the rev / min decreases, the governor weights move ________, causing subsequent motions.inwards outwards upwards downwards A 686When the rev / min increases, the governor weights move ________, causing subsequent motions.inwards outwards forwards backwards B 687When the starting air valve closes on one cylinder, another starting air valve has ________ opened on just nearly merely already D 688When the water produced from most evaporator is supplied for drinking purpose, it must be treated to slightly acidic slightly alkaline no salty slightly bitter B 689When to remove scale from the cooling spaces, acid solution ________ in the system can be tested fr strength dense percentage velocity A 690When turning the engine with turning gear, you should keep the indicator cocks ________.attached to the indicators opened closed broken B 691Which cause of the following can lead to the engine not to start on air?starting air pressure too high correct timing of starting air valves three of the starting valves stuck the turning gear disengaged C
cetane number flash point viscosity setting point C 692Which factor of the following affects not only the fuel's combustion but also the engine's maintenance?
693Which of the following can be directly obtained by means of an indicator card.power maximum pressure in a cylinder mean pressure in cylinder all of the above B 694Which of the following can be obtained by means of an indicator card?the peak pressure in a cylinder the temperature of the cooling water the fuel consumption none of the above A 695Which of the following firing order may be used for an 6 cylinder engine?1-2-3-4-5-61-2-3-6-5-41-5-3-6-2-41-3-4-5-6-2C
setting point ash sulfur content carbon residues A 696Which of the following is a factor of fuel oil almost having nothing to do with the formation of combustio
697Which of the following is true about the fuel injection with an ordinary diesel engine?The process begins after TDC.The process ends before TDC.When the piston is near to the TDC the fuel None of the above is true.D 698 A distance piece, with ground faces, may be interposed between the rod and the bearing housing, its t expansion ratio pressure ratio compression ratio clearance ratio C 699Which of the following may cause that an engine doesn't turn on starting air?too low starting air pressure main start valve closed neither A nor B A and B D 700Which of the following may lead to the engine NOT to start on air?starting air pressure too high correct timing of starting air valves three of the six starting valves stuck the turning gear disengaged C 701Which of the following may take place if the clearance of the main bearings are excessive?bearing knocks dropping of pressure of L.O.noises all the above D 702Which of the following will be the function of lubricating oil used in marine engines?to remove heat from oil cooled piston to wash away wear detritus to neutralize acidic products all of the above D 703Which of the following will take place if the clearance of the main bearings are excessive?bearing knocks dropping of pressure of L.O.noises all the above D 704Which of the following would cause a diesel to have black smoke?leaky injector water in the gas too heavy oil water in the oil A
crankcase slipper cam housing crankshaft D 705Which engine is in operation the piston moves up and down, thus causing the rotation of the ________
706Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenge air bel exhaust valves starting valves fuel valves the indicator cocks D 707With ________ unit the timing of fuel injection of an engine can be regulated automatically. F.W.E.MEP W.H.R.VIT D 708With ________ unit the timing of fuel injection of an engine can be regulated automatically.MBT MEG VSG VIT D
1248B 709With four-stroke engines, it takes four revolutions of the crank shaft to make ________ power stroke (s
710With supercharging a larger mass of air is supplied to the cylinder by blowing it in under pressure, whi increase the exhaust temperature increase the power of reduce the speed increase the fuel consumption B 711With the crank in position in the engine, some measurements can be taken by a special bridge gauge a micrometer a bowl a feeler gauge a wrench C
has a nip is large enough is zero are suitable C 712With the shell and cap assembled as for running, a check must be made that the clearance between th
713With two-stroke engines, it takes four revolutions to make ________ power stroke (s).1248C 714With uniflow scavenging the incoming air enters ________ and leaves at the top.at the bottom of the cylinder at the lower end of the cylinder at the middle of the cylinder in the scavenging box B 715With Variable Injection timing the start of injection may be ________ as the engine load is reduced.advanced retarded kept constant none of the above A 716With VIT the start of injection may be ________ as the engine load is reduced within a certain range.advanced retarded relayed cut off A 717With VIT unit the timing of fuel injection of an engine can be regulated automatically according to the _ship draft pitch engine load oil viscosity C 718Worn out ring grooves should be ________ to standard dimension after being welded.machined bored honed drilled A 719 A gudgeon pin in a trunk piston may be free to float and rotate, with ________ to limit axial movement.split pins crankpins dipsticks circlips D
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720You increased the ________ to 150 tons that's why the fuel oil ________.pumped speed / came out pumping rate / overflowed flowing rate / leaked out flowed speed / spilled out B 721You must take good care of the drainage cock of the air control system. Because ________ leads sca the temperature the rust the pressure the humidity D 722With ________, the corrosion are much reduced in a central cooling system.no equipment in contact with sea water less equipment in contact with fresh water more equipment in contact with sea water less equipment in contact with sea water D 723In general, the best way for replacement ________.after the point is reached at which the failure before the point is reached at which the failure before the point is reached at which the failu after the point is reached at which the failure B 724The trouble-free life of an engine indicates ________.the period of time during which no trouble oc no trouble will occur to the engine all its life trouble may occur freely to the engine no matter you do to the engine, no trouble wi A
the distance between them is changing the position between them is not changingtheir positions to the earth remain the same B 725When we say that two objects have relative motion, we mean ________.the distance between them remains the same
726Before using or operating any equipment, you should first ________ its manual thoroughly and unders read / sufficient consult / sufficiently read / sufficiently consult / sufficient C 727The rotating range of the low speed diesel engine is usually lower than ________.100rpm200rpm300rpm500rpm C 728Among the main propulsion units on board the ship with the same capacity, the lightest one is ______steam engine steam turbine gas turbine diesel engine C 729The essential part of the diesel engine, whose function is to convert the heat energy into the mechanic crankshaft piston connecting bearing B 730Owing to its ________, the low speed cross-head diesel engine is widely used on board ship as a mai smaller size and simple construction long life, lower cost and reliability easier operation and management simple construction and easier management B 731If we turn the four-stroke diesel engine into the two-stroke one with the same volume of the cylinder an60 percent100 percent80 percent40 percent C 732The stroke coefficient of the two-stroke diesel engine is ________.12one-second one-fourth A
One of the piston cooling methods is vibratio B
The lower the piston cooling temperature is, th Both water and lube oil can be used as coola
733As to the piston cooling, of the following, which statement is not true?Because the piston is exposed to very high te
734As to the bearing, of the following, which statement is not true?If overheat is found, the engine must be stop Much heat of the crankcase door indicates tha If bearing clearance is too large, knocking wi If bearing clearance is too large or too small,B
cylinder liner cylinder cover piston exhaust valve C 735In the combustion chamber, the part whose surface is exposed to the highest temperature is the _____
736The hot expanding gas rotates the blades of the exhaust turbine, thus ________ large of its power, __to give off / which giving off / which to give off / that giving off / that B 737________ the cylinder walls, the heat passes through them by conduction.When receiving by When received by In order to receiving In order to receive B
The high / the large The higher / the larger The lower / the larger The low / the large B 738________ the compression ratio, ________ the proportion of the heat energy of the combustion turned
739________ on board the ship transfers power from the main engine to the propeller.The transmission system The supply system The chain system The control system A 740The different items in the transmission system consist of ________.the thrust shat one or more intermediate shafts the tail-shaft A, B and D D 741The function of the thrust block is to transfer the thrust from the propeller to ________.the tail-shaft ahead and astern thrust the main propulsion engine the hull of the ship D 742The development of oils ________ the increasing demands made by the steady rise in powers produc has kept pace with has kept pace to has made pace with has made pace to A 743Large marine diesels of cross-head construction generally have two systems of lubrication, ________ a circulating system / a total loss system a total loss system / a circulating system an opened system / a closed system a closed system / an opened system B 744Cylinder wall temperature, fuel oil sulphur, and oil passage ________.are interdependent are not interdependent have nothing to do with each other are independent A 745Suppose the rated capacity of the main engine of a ship is 10,000 kW. at 100 rated rpm, then when at800kW5120kW6400kW4180kW B 746The opening or closing of the cylinder starting valve is controlled by ________.the starting air distributor the cut-off valve on the air main the main starting valve the air bottle control valve A 747The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubrica8~10℃10~12℃10~15℃10~20℃A 748As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can
the inlet valve the outlet valve both the inlet valve and the outlet valve the pump inlet valve B
C 749For Vee-form engines, ________ is shaped to given two shopping surface on which ________ are pla the bottom of the column / the cylinder blocks
the top of the column / the cylinder heads the top of the column / the cylinder blocks the bottom of the column / the cylinder heads 750In low speed cross-head diesel engine, which of the following is easily damaged?The main bearing The thrust bearing The cross-head bearing The crank-pin bearing C 751The fuel oil pressure and forced draught pressure should be matched to ensure good combustion with join with mix be equal to be constant C 752If you don't understand the meaning of the technical terms of the diesel engine, you can ________ the look for find out consult read C 753The fuel injection system is very important, so any trouble of it will ________ the operation of the main be affected affect be effected effect B
A
have much doing with the operation of the en
has much doing with the operation of the eng
754The quality of the fuel oil and lube oil ________, I'm afraid.has much to do with the operation of the eng have much to do with the operation of the engin
A
Gasoline engines have more advantages in c 755________, so they are widely used on board ship nowadays.Diesel engines have more advantages in com
Diesel engines have more advantages in comp Gasoline engines have more advantages in c
756Since the engine doesn't work well, you'd better ________ as soon as possible.reduce its speed find out its trouble eliminate its trouble all the above D 757 A diesel engine burns ________ a gasoline engine of the same capacity in the same period of time.as much fuel as less fuel than less fuel as more fuel than B 758After the ship is out of the harbour and in ― Full Speed‖, we'll change ________.to fuel oil instead of diesel oil for fuel oil instead of diesel oil to diesel oil into fuel oil for diesel oil into fuel oil A 759When the fuel oil is burning in the combustion chamber, it ________.gives up large amount of heat gives off large amount of heat gives up large amount of steam gives off large amount of steam B 760________ into the cylinder because no fuel can burn ________ it.Air must be admitted / without Oil must be injected / without Air must be admitted / with Oil must be injected / with A 761The ________ can tell us how much heat we can get from the burning of an oil.viscosity flash point cetane number calorific value D 762If the temperature drops low enough, oil will not flow. ________ just tell us the temperature.Flash point Viscosity Pour point Cetane number C 763In the closed cooling system, the water ________.is made to circulate out of the system is made to circulate within the system is made circulate within the system is made circulate out of the system B 764The most important factor that causes the wear of the engine parts is ________.excessive heat friction oxidation high pressure B 765The lube oil to lubricate the surfaces of the cylinder liners is spread over by the ________.sliding piston rings engine's camshaft small pumps forced feed system A
brought about caused for resulted from led A 766Impurities in the fuel oil will affect the operation of the engine, which has ________ the use of separato
767The emulsion of the oil is mainly caused by ________.the solid impurities of large particle the solid impurities of fine particle the water content both water and solid impurities C 768 A decrease in the flash point of diesel engine lube oil indicates the lube oil has become ________.contaminated with sludge contaminated with carbon diluted with fuel oil diluted with water C 769Crank web deflection readings will give a positive indication of ________.worn main bearing journals torsional stress deformation slack thrust bearings bearing shells shim dimensions A
A 770What preventative maintenance should be done frequently to diesel engine starting air receivers?Drain the accumulated moisture Test the relief valves Watch the temperature to prevent fluctuation Clean the interior to remove oil and foreign m
D 771In comparison to exhaust valves, intake valves of diesel engines may be fabricated from lowalloy steels the beveled edges of the intake valves provid intake valves utilize stellite-coated valve seat in the volume of air passing through intake valv intake valves are less affected to the corrosiv 772Fusible plugs are installed in fire-tube boilers to ________.provide a means of draining the boiler warn the engineer of low water level cool the crown sheet at high firing rates open the burners' electrical firing circuits B
remain in the neutral position B 773Friction developing between the moving parts of a governor, governor linkage and control valve will cau react with insufficient speed droop fail to react to small speed changes have excessive sensitivity to small speed cha
774Which of the bearings listed are most widely used for the main and connecting rod bearings of a diese Roller bearing Sleeve bearing Sliding bearing Needle bearing C
Splash lubrication Pressure lubrication Sight feed lubricators Mechanical lubricators B 775Which of the following methods is normally used to lubricate bearings in a small high-speed diesel eng
Pilot valve opening compensating needle valve compensating spring tension accumulator spring tension B 776 A large change in ambient temperature, or using an oil of a viscosity different from the one recommend
777To check the setting of the over speed trip on a diesel powered generator, you would use a ________.tachometer torsion meter dynamometer pony brake A 778In a naturally aspirated diesel engine, the volume of air intake is directly related to engine ________.compression ratio valve size fuel pressure cylinder clearance volume B 779Two important considerations for the proper lubrication of a diesel engine include, the delivery of the oi cetane number pour point viscosity temperature quality of the oil D 780Friction, engine wear, and oil consumption in a diesel engine are directly related to the ________.acidity of the oil pour point of the oil flash point of the oil viscosity of the oil D 781In a diesel engine, the main bearings are used between the ________.connecting rod and the crankshaft wrist pin and the connecting rod camshaft and the engine block crankshaft and the engine block D 782The replacement piping for diesel engine high pressure fuel systems must be the same length and dia avoid unnecessary parts inventory keep torsional vibration constant use existing supports and braces maintain specified injection characteristicsD
C 783Diesel engine jacket water is used in the distillation process as the ________.coolant for the distillate coolant for the brine cooler means of heating the feedwater primary means of producing a vacuum within 784 A controllable pitch propeller on a diesel driven vessel eliminates the need for ________.friction clutches disconnect clutches reversing gears reduction gears C
drop an equal amount of any decrease in loa A 785When the prime movers of two paralleled generators are equipped with mechanical-hydraulic governor pick up more of any increase in load pick up less of any increase in load share an equal amount of any increase in loa
786To prevent vibration damage to the fuel supply line of a diesel engine, you may use ________. a short length of heavy duty clear plastic tubi a length of approved flexible nonmetallic hose w elded flange connections for all joints aluminum piping with expansion loops B
non-additive oils are used in the main engine different type centrifuges are required for the B
coolers are not needed for the gear system contaminants produced by the engine could ha
787Motor vessels usually have independent lube oil systems for main engine and reduction gears because
788Clearance volume scavenging in a turbocharged, four-stroke / cycle diesel is accomplished ________.during the valve overlap period with only the exhaust valve open at a pressure below atmospheric without cooling the cylinders or pistons A 789Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the pres fuel oil vapor at the sludge tank vent unburned fuel vapors in the scavenge air recei lube oil vapors in the crank case lube oil vapors in the engine room C 790Directional intake ports in diesel engines are used to ________.reduce air charge turbulence induce air swirl deflect hot combustion gas away from the va oppose the effects of piston induced squish B 791Generating tubes in waste heat boilers are finned to ________.reduce gas flow turbulence prevent exhaust gas corrosion increase the rate of combustion increase the rate of heat transfer D 792If an operating auxiliary boiler has a water pH reading of 7, you should ________. bottom blow the boiler treat the water with caustic soda treat the water with chemical scavengers reduce the water alkalinity to recommended r B 793Diesel engine main and connecting rod precision bearings are made in halves. Each half exceeds one-
clearance crush pitch thrust B 794Fuel is admitted to a diesel engine cylinder through the ________.Intake valves carburetor exhaust ports injector nozzles D 795The piston rod stuffing box incorporated in a two-stroke / cycle, crosshead diesel engine serves to ___eliminate the necessity for and oil scraper rin prevent side thrust and cylinder scoring prevent sludge and dirty oil from entering the scrape oil and carbon deposits off the cylind C 796 A feed pump for an auxiliary boiler might lose suction if the ________.boiler water level is low feedwater is too hot boiler steam demand is low feed water is too cold B 797The water in an auxiliary boiler should be tested daily for ________.dissolved oxygen chlorides sludge dissolved nitrogen B
excessive crankcase pressure excessive lube oil temperature contamination of the lube oil by water contamination of the cooling water by lube oi C 798Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to pre
799Fuel oil begins injection into the cylinder of a four-stroke / cycle diesel engine during the ________.intake stroke exhaust stoke power stroke compression stroke D
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800Lube oil pumps taking suction from the sump of most small marine engines are usually ________.of the diaphragm type of the centrifugal type of the positive displacement type independently driven by electric motors C 801 A large, low-speed, main propulsion diesel engine use sea water to directly cool the ________.cylinder heads exhaust valves scavenging air injectors C 802The total starting air capacity required for reversible main engines is to be sufficient for a least ______six consecutive starts eight consecutive starts ten consecutive starts twelve consecutive starts D 803Most fuel injection nozzles are opened by ________.fuel oil pressure a cam operated follower a spring-loaded pressure plate timing gears keyed to the crankshaft A 804The lube oil pump used in a diesel engine is a ________.volute pump centrifugal pump diaphragm pump gear pump D 805When a waste hear boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust ga at high loads to prevent overheating at low loads to prevent corrosion in the boilerduring periods of high steam demand when the turbocharger is in operation B
Upper half of the main bearing Lower half of the piston pin bearing in the co All bearing halves share an equal load C 806Which bearing half will receive the greatest load in a two-stroke / cycle diesel engine?Lower half of the connecting rod bearing at th
807 A naturally aspirated diesel engine at full throttle will have and intake manifold pressure ________.slightly less than atmospheric pressure approximately equal to exhaust manifold press that is widely fluctuating constantly decreasing as engine load increases A
A
prevent reflected pressure waves when the n
prevent combustion gas blowback into the op
808During the fuel injection period, fuel pressure must exceed cylinder gas pressure to ________.ensure penetration and distribution of the fue ensure the needle valve is flushed clean during
809The overspeeding of the diesel engine driving and electric generator could cause ________.low voltage trip to trip reverse power trip to trip damage to windings excessive exhaust temperatures C
decrease in exhaust manifold pressure C 810An increase in the air inlet manifold pressure of a diesel engine will result in a / an ________.decrease in maximum cylinder pressure increase in ignition lag decrease in fuel consumption per horsepowe
filtering occurs twice in each pass of oil throug clogging will not occur dropping pressure is half of that through a si A 811For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because _changing filter elements would not interrupt e
812The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head reduce water temperature reduce water turbulence provide an air cushion allow for an increase in water volume as the D 813To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of ________.brass copper iron monel metal or stainless steel D
All of the above.D 814Which of the following statements describes the function of an expansion tank in a diesel engine coolin
Maintains a constant head on the system.Reduces the likelihood of air steam pockets fo Provides a low pressure point for the addition
A 815Prior to lighting off a cold automatically fired auxiliary boiler, you should ________.check and regulate the water level close the air cock once fires are lit blowdown the gage glass crack the steam stop to assure protective ste 816One method of constructing large marine diesel engines and reducing the total engine frame weight is casting interlocking components welding plates to form sections for assembly forging integral components case hardening integral components B
The oil control valve is always installed in the C
The oil pressure is less than the cooling water The oil pressure is greater than the cooling w
817Which of the following statements is true concerning an oil cooler?The oil temperature is less than the cooling w
818The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed fresh water expansion tank sea water expansion tank thermostatic expansion valve jacket water cooler accumulator A 819Scavenging in a four-stroke / cycle diesel engine occurs during the ________.last part of the exhaust stroke, and the first p last part of the intake stroke only early part of the injection stroke only early part of the power stroke A 820The color of the exhaust from a diesel engine should be ________.clear hazy light brown hazy light blue hazy light grey A 821In a large, slow-speed, main propulsion diesel, which of the parts listed is under tension when the engi Bed plate Column Entablature Tie rod D 822The lube oil cooler is located after the lube oil filter in order for ________.the filter to operate more efficiently the lube oil cooler to be bypassed positive lube oil pump suction to be assured galvanic action in the cooler to be minimized A 823The highest pressure in any closed diesel engine freshwater cooling system is at the ________.jacket water outlet expansion tank inlet heat exchanger inlet cooling water pump outlet D 824Concerning diesel propelled vessels, the astern power is to provide for continuous operation astern __equal to that available for ahead operation at 70 percent of the ahead rpm at rated speed while underway and under all normal conditio
B
at 70 percent of the ahead rpm of average co 825In a two-stroke / cycle diesel engine, the process of scavenging begins as the ________.piston nears and passes TDC latter part of the down stroke piston passes BDC early part of the down stroke B 826If the fire out in an automatically fired auxiliary boiler and the burner continues to supply fuel, there is a overpressure and dry firing a severe furnace explosion spalling damage to the brickwork heat damage to the atomizer B 827Improper maintenance of an automatic auxiliary boiler oil burner could result in ________.fuel pump failure fan motor failure increased feedwater consumption decreased boiler efficiency D 828The bearings used to support the crankshaft are generally called ________.line shaft bearings connecting rod bearings main bearings support bearings C 829With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after f allow filtration of less viscous oil decrease the pressure drop across the filter improve overall filtration all of the above D 830In any diesel engine closed freshwater cooling system, the lowest pressure exists at the ________.jacket water outlet cooling water pump outlet heat exchanger outlet expansion tank atmospheric vent D 831Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the air charge density becoming too high piston crown surfaces becoming too cold formation of excessive quantities of condens compression pressure being greatly reduced C 832After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are de
furnace to be re-purged electric charge buildup in the igniter fuel pump to restart drum level to stabilize A 833Passages are drilled in the crandshafts of diesel engines to provide lubricating oil to the ________.main bearings connecting rod bearings piston pin bushings All of the above D 834The outlet from an expansion tank of a closed freshwater cooling system should be piped to the _____cylinder head water outlet header cylinder jacket inlet main heat exchanger inlet connection jacket water pump suction line D 835The intake valves in a diesel engine are reseated by ________.cam followers push rods combustion gases valve springs D
B 836The main function of tie rods in the construction of large, low speed diesel engines is to ________.stiffen the bedplate in way of the main bearin accept most of the tensile loading that results f mount the engine frame securely to the hull t connect the crosshead solidly to the piston ro
banjo feed splash feed gravity feed pressure feed D 837On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by _
838The expansion tank in a diesel engine closed freshwater cooling system is located at ________.the highest point in the system the lowest point in the systemor near the floor plate level or near the tank top level A 839When accumulated carbon at the air inlet ports of a two-stroke / cycle diesel engine is being removed, entering the cylinder particles becoming lodged under the intake val entering the water jacket particles entering lube oil A 840Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine __camshaft bearings main bearings piston crowns cylinder walls B 841If the valve tappets in a diesel engine are set at greater clearances than those specified by the engine m
open late and close early open late and close late fail to open when the engine is cold fail to open at normal operating temperature A
free entry of air to the crankcase water entering the crankcase while engine was excessive oil leakage during periods of incre sub-cooling internal components A 842Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the po
843 A diesel engine crankcase ventilation system ________.prevents spark generation removes combustible gases determines the level of combustible gases provides inert gas generation in crankcaseB 844Increasing the valve clearance between a valve stem and rocker arm, will result in the valve ________.closing later opening sooner staying open for a shorter period of time staying open for a longer period of time C
Prevents the accumulation of combustible gas Improves lube oil cooling.Improves cold weather starting.B 845What function is provided by the crankcase ventilation system on some diesel engines?Increases the sludge forming tendency of lub
846Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by ________.internal crankshaft passages immersion in oil splash lubrication injection lubrication A 847The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler ____
salinity is abnormally high steam demand is too high water level is abnormally low feedwater flow is low C
The safety valve escape piping should be dis The boiler vent valves should be opened.All handhole / manhole covers should be tigh
All of the above.B 848In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedure
849Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?Increased suction head pressure.Decreased feedwater temperature.Pump recirculating line being open too much Excessive feedwater temperature.D 850The crankcases of many diesel engines are kept under a slight vacuum to ________. improve fuel economy increase the air charge velocity reduce the risk of explosion all of the above C 851The rate of cylinder lubricating oil metered to each cylinder of a large, low-speed, main propulsion dies the same, whether at sea, or during maneuv adjusted during each hour of operation while a higher at sea than while maneuvering lower at sea than while maneuvering C 852On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lub a spindle lubricator an oil jet internal splashing drilled passages in the crankshaft D 853Fins are installed on the generating tube surfaces in waste heat boilers to ________.prevent soot fires in the exhaust system prevent exhaust gas erosion of the tubes increase the velocity of exhaust gas flow increase the rate of heat transfer D
gland exhausting manometer crankcase exhaust fan D 854The crankcase of many diesel engines are kept under a slight vacuum by the ________.scavenging action of the piston piston type vacuum pump taking suction off a d
855Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the followin
Splash Gravity Pressure Bypass C
Clogged air intake filters Piston blow-by A defective after-cooler Faulty exhaust valves C 856Which of the following conditions can cause above normal air temperature to develop in the intake man
high steam pressure in boiler abnormally high feed water temperature abnormally high boiler water temperature steam demand exceeding feed pump capaci B 857If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, cause may be ______
858Lubrication for the main reduction gears used with diesel engines is usually supplied by ________.oil from the main engine sump an independent oil system the stern bearing head tank the stern bearing sump tank B 859When there is a flame failure in an automatically fired auxiliary boiler, the ________.air supply is shut off fuel supply is shut off water supply is shut off safety valve lifts B 860Excessive vibration of an automatically fired auxiliary boiler can be caused by ________.air or water in the furnace combustion pulses fuel oil pump failure flame failure B 861Cooling the intake air supplied to a diesel engine will ________.reduce mean effective pressure decrease average compression pressure decrease air charge density increase power output D 862The water in an auxiliary boiler should be tested for chloride content to determine ________.total dissolved solids salt contamination water hardness chlorine contamination B 863The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of seawater contamination frequent surface blows dissolved oxygen deaeration frequent bottom blows A
two times crankshaft speed in a two-stroke c one-fourth times crankshaft speed in a four-s
B
crankshaft speed in a two-stroke cycle diesel e
864The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speed. In ma one-half crankshaft speed in a two-stroke cyc
865 A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passin around the engine around the cooler to the expansion tank overboard B 866Bottom blow valves are installed on auxiliary water-tube boilers to ________.remove suspended and precipitated solids fr completely drain the boiler in an emergency sit prevent hardened scale deposits in the water remove floating impurities from the oily water A
operated manually once an hour operated until the engine has started placed into operation only at maximum load adjustable to meet lubrication requirements D 867Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are ___
868In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat ex suction pressure regulator thermostatic bypass valve sea water temperature water level in the expansion tank B 869The opening of an exhaust valve on a modern, large, low-speed, main propulsion diesel engine, may b direct action of cam shaft compressed air pressure hydraulic ―push rods‖direct action of the main piston moving down C 870The speed of the camshaft in a two-stroke / cycle diesel engine, running at 950 RPM, is ________.475 RPM950 RPM1900 RPM2400 RPM B
the power stroke the compression stroke low load operation only periods of standby B 871Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during
cooling water pump nozzle cooling passages cylinder jackets heat exchanger D 872Temperature control valves installed in the jacket cooling water system of a diesel engine, modulates th
873 A restricted air intake to a diesel engine may result in the engine ________.failing to reach rated speed knocking under maximum load hunting or surging under light load overspeeding and running away A 874In a four-stroke / cycle diesel engine, the camshaft rotates at ________.twice the crankshaft speed half the crankshaft speed the same speed as that of the crankshaft a speed independent of that of the crankshaf B 875For diesel engine piston cooling, lubricating oil can be supplied to the piston by a / an ________.oil spray oil bath oil control rings drilled passage through the camshaft A 876The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlle regulating the level of corrosion inhibitor in th the level of the freshwater expansion tank varying the engine load to meet temperature the operation of the thermostatic valve D 877On a turbo-charged, medium-speed, diesel engine, which of the following problems is an indication of Engine is hard to start Engine misses Surges at governed RPM Coolant temperature is too low A 878The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each ____hour day week month B
large conical springs compressed air pressure hydraulic pressure exhaust gas pressure B 879The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine m
880In a two-stroke / cycle diesel engine, the camshaft rotates at ________.twice the crankshaft speed half the crankshaft speed the same speed as the crankshaft a speed independent of the crankshaft C
high firing pressure and high exhaust tempe B 881An indication of a diesel engine air intake being partially clogged, is ________.low firing pressure and low exhaust temperat low firing pressure and normal exhaust temper high firing pressure and low exhaust tempera
open quickly against crankcase pressure to pr close quickly in order to prevent an inrush of close slowly to permit proper seating of the v C 882An important design characteristic of an explosion relief valve for a diesel engine is the ability to _____open slowly to permit a gradual reduction of c
525 RPM775 RPM1550 RPM1880 RPM B 883If a four-stroke / cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be ______
884For proper operation, auxiliary boiler feed water must have which of the following characteristics?High oxygen concentration Low pH Proper alkalinity All of the above C 885The most common cause of scale formation in an auxiliary boiler is ________.concentrations of calcium sulfate in the boile fuel oil in the feed water improper treatment of the feed water with cal excessive feed water alkalinity A
open air-box drains loss of cooling water to the diffuser gradual fouling of the air filters improperly timed exhaust valves C 886If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, a
887Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should hav10741A 888The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to ________.assist in a quick cutoff of fuel injection allow oil backflow from the injector to the helix r educe fuel oil pressure between injection str meter the quantity of fuel delivered A 889Excessive alkalinity of the water in an auxiliary boiler can cause ________.caustic embrittlement of boiler metal acidic corrosion of the boiler metal hard scale deposits on the boiler tubes etching of the heat exchange surfaces A
increasing the pH reducing the phosphate level B 890The procedures recommended for auxiliary boilers having high salinity include ________.treating with oxygen scavengers securing the boiler and giving it a blowing down
891Which of the following conditions may need to be reduced when operating a large, low-speed, main pr Injection pressures Control air supply pressure Cooling water flow through after-coolers Lube oil temperature C 892Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in __increased fuel consumption increased feed water consumption fuel pump failure combustion control system failure A 893The upper piston rings in large, slow-speed, two-stroke / cycle diesel engines are most effectively lubri fed from mechanical lubricators thrown off from the main bearings supplied from wick fed drip lubricators flow from a centrifugal or banjo oiler A
the formation of sulfuric acid a decrease in lube oil viscosity a decrease in cooling water pH a thermostat failure A 894Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatu
need for water treatment is eliminated cooling water temperature differential is greate cooling water pumps are directly reversible jacket water temperature is more easily contr D 895 A closed freshwater cooling system is commonly used with marine diesel engines because the ______
896―Loop‖ ―uniflow,‖ ―crossflow,‖ and ―return-flow‖ are terms used to describe various types of ________.control air circuits supercharging turbochargers scavenging D 897oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium ___sulfite or hydrazine sulfite or hygroscopic sulfite bromide or hydrazine bromide or hygroscopic sulfite A 898The principal difference between loop scavenging and crossflow scavenging, as used in single acting direction of air flow within the cylinder sequence of port opening method of opening exhaust ports volume of air admitted to the cylinder A 899The PRIMARY function of a waste heat boiler is to ________.reduce engine exhaust noise reduce engine back pressure recover heat which otherwise would be lost i ncrease turbocharger efficiency C 900Large, two-stroke / cycle, main propulsion, diesel engine cylinders can be successfully pressure charg exhaust gas temperature system exhaust load system constant or pulse pressure system constant volume system C 901Fuel injection systems meter fuel, atomize fuel, and ________.create turbulence in the combustion chambe aid in completing cylinder scavenging inject fuel at the proper time minimize fuel penetration into the cylinder C 902 A SECONDARY function of a waste heat boiler is to ________.reduce engine exhaust noise reduce engine back pressure increase engine cycle efficiency increase turbocharger efficiency A
increase air inlet temperature increase compression ratio increase jacket water temperature for easier D 903An electric heater built into some smaller diesel engines is used to ________.raise lube oil viscosity for easier starting in co
375 RPM500 PRM750 RPM1500 RPM D 904What is the speed of the crankshaft in a four-stroke / cycle engine when the camshaft is turning at 750
905 A waste heat boiler is installed on some diesel propelled vessels to ________.provide steam for emergency propulsion provide steam for the turbo-generator heat the waste water tanks steam for warming engines B 906Camshafts are usually driven by timing gears or ________.push rods chain drives rocker arms flywheels B
gas composition gas temperature pressure timing B 907The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust __
908Waterside scale in a fire-tube boiler may cause ________.increased heat transfer fireside erosion high steam demand overheated tubes D
① only② only both ① and ②neither ① or ②B 909With regards to a diesel engine crankcase explosion, the most violent is the ________.① primary explosion; ② secondary explosion.
910When an auxiliary boiler is panting and emitting black smoke, you should ________.increase the fuel oil temperature decrease the fuel oil temperature decrease the fuel oil supply pressure increase the air supply D 911If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutraliz
acidity has increased viscosity has decreased demulsibility has improved foaming is guaranteed to occur A
① only② only both ① and ②neither ① nor ②A 912 A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the sam① scavenging air is cooling the exhaust gases; ② exhaust cycle time is longer.
Turbocharged, return flow diesel engine.A 913With which of the following types of diesel engine arrangements is a waste heat boiler most likely to pr Supercharged, four-stroke cycle diesel engin Supercharged, loop scavenged diesel engine.Turbocharged, crossflow scavenged diesel e
914The camshaft on a four-stroke / cycle diesel engine provides a means to operate the ________.fuel injectors exhaust valves intake valves all of the above D 915The rate of fuel injection in a diesel engine cylinder depends primarily on ________.the size of the holes in the fuel nozzle timing of the pump supply pressure to the pump shape of the combustion chamber A
① only② only both ① and ②neither ① nor ②C 916 A large low speed main propulsion diesel engine may become overloaded by ________. ① a heavily fouled hull; ② strong head winds and heavy seas.
917Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce ________.cold corrosion of the nozzles fuel viscosity for better atomization carbon accumulation on the nozzles fuel detonation in the cylinders C 918 A diesel engine cooling water system with a pH factor 3.0 indicates a condition of ________.slight acidity slight alkalinity excessive alkalinity excessive acidity D 919Which of the following statements concerning fire-tube boilers is correct?Combustion gases flow through the tubes.Flames impinge on the https://www.doczj.com/doc/1e17804075.html,bustion occurs in the tubes.Water flows through the tubes.A 920In a diesel engine cooling water system, a pH of 6.0 indicates a / an ________.slightly acidic condition slightly alkaline condition overtreatment of water neutral condition of water A 921Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by _______heat conduction into the injected fuel oil heat conduction into the water jacket wall water circulation through passages in the ho fuel oil circulation through passages in the h B 922The pH value of water in a diesel engine closed cooling water system should be maintained between _6.0 to 7.58.0 to 9.510.0 to 11.512.0 to 13.5B 923The purpose of the safety relief valves installed on an auxiliary boiler is to ________.relieve excess fuel oil pressure during the ―of admit water to the dry pipe throttle the forced draft fan output for proper reduce excess steam pressure in the boiler D 924The most common contaminate of governor hydraulic fluid is ________.moisture dirt acid air B 925Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?Impurities Lube oil Gasoline Diesel fuel A 926 A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of water babbitt iron or steel acids C
① only is correct② only is correct both ① and ② are correct Neither ① or ② are correct A 927 A two-stroke diesel engine exhaust temperature will be lower than a four-than a four-stroke diesel engi① MEP is lower and the scavenging air is cooling the exhaust gases; ② valve overlap in a four-stroke.
All engine shall be provided with an exhaust A 928Which of the following listed instruction details of internal combustion engines is required? A warning notice to caution against the open The use of end block construction for engines Removable cylinder liners must be used for e
929In reducing engine speed to an efficient propeller speed by the use of reduction gears, ________.speed and torque are both reduced speed is reduced and torque remains unchang speed is reduced and torque is increased speed is sometimes unchanged while torque C 930In order to reverse the rotation of a two-stroke / cycle loop scavenged, direct reversing, propulsion dies starting air and fuel pumps piston cooling pumps exhaust valves all of the above A 931Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or inside micrometer feeler gauge adjustable trammel sighting device B
456090100C 932What is the crank angle between any two crank throws in the firing order of a four-stroke / cycle, in line
flywheel crankshaft journal bearings camshaft B 933The linear motion of a diesel engine piston is converted to the rotary motion required to drive gears, pro
934High diesel engine cooling water temperatures can be caused by ________. a worn water pump not enough coolant air in the cooling system all of the above D 935The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston camshaft reduction gears rocker arm connecting or piston rod D 936High diesel engine cooling water temperatures can be caused by ________.air in the cooling system an overhauled water pump correct amount of coolant no air in the cooling system A
0.30 to 1 3.00 to 1 3.33 to 133.0 to 1B 937 A diesel engine is operating at 1800 RPM and driving a propeller at 600RPM. What is the speed reduc
① only is correct② only is correct both ① and ② are correct neither ① or ② are correct C 938The control system for a controllable pitch propeller can be programmed ________. ① to produce a maximum combined propeller and engine efficiency between pitch and a given engine speed; ② for continuous operation of the engine at pre-set condition.
939 A viscous damper, as used on a marine diesel, is a sealed precision built device which dampers the to camshaft flywheel crankshaft thrust shaft C 940Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a / an ________.overspeed trip audible / visual alarm the ships / boats general alarm reserve oil storage tank B
oil suction line restriction correct amount of coolant cavitation erosion in the water jackets clogged sea suction strainer D 941Higher than normal jacket water temperatures occurring in all cylinders of a diesel engine can result fro
clogged intake air intercooler control air leak leaking air starting valve malfunctioning governor D 942If the operating speed of a diesel engine increases without an apparent change in the engine control se
① only is correct② only is correct both ① and ② are correct neither ① or ② are correct C 943When centrifuging heavy fuel oil, an important factor to consider is the ________. ① flow rate; ② viscosity of the fuel oil.
944 A crankshaft whose center of gravity coincides with its center line is said to be ________.dynamically balanced statically balanced counter balanced resonantly balanced B 945The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed ________.metering timing rate of injection rate of distribution C 946In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase metal particles loosened by wear air when no air cleaners are used condensation of water vapors breakdown of the lubricating oil by dilution D
topping off all receivers at the required desig A
supplying all the air necessary to start both th
947Two air compressors are provided for the starting air system and should be capable of ________.charging the starting air containers within on providing the minimum quantity of starting air a
① only is correct② only is correct both ① and ② are correct neither ① or ② are correct A 948The air supplied to a diesel engine is compressed to ________. ① provide heat for the ignition of the fuel; ② decrease injection delay.
949The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of __an isochronous governor elastic engine mounts a vibration damper a cast iron bed plate with good flexible qualiti C 950If the jacket water temperature of an operating diesel engine suddenly rises above normal, the cause c an overfilled expansion tank excess chromate treatment of the jacket water a clogged raw water sea suction cavitation erosion of the heat exchanger tube C 951In an auxiliary boiler steam and water system, the highest pressure will be in the ________.steam stop valve dry pipe feedwater system generating tubes C 952 A dirty diesel engine oil filter element can best be detected by ________.visual inspection of the elements the pressure drop across the filter high lube oil sump temperature decrease in oil viscosity from the filter B 953Increasing the load on an engine equipped with a constant speed mechanical governor, will cause the increase decrease fluctuate remain constant B 954The small end of the connecting rod is attached to the piston with a ________.crankpin sliding wedge wrist pin torque bushing C 955Before starting a diesel engine that has an engine driven lube oil pump, the engineer should ________open the bypass line cut in the lube oil cooler pressurize the lube oil system top off the expansion tank C 956In a diesel engine lube oil system, which of the following parts should be lubricated first?Camshaft bearings Main bearings Piston crowns Cylinder walls B
A
engine driven transfer pumps and only used the capacity of the engine driven pump excee 957Fuel oil transfer systems used onboard diesel propelled vessels are required to have ________.two fuel oil transfer pumps provided where on
two fuel oil transfer pumps, with a combined ca
958Connecting rods in a diesel engine are used to connect the ________.engine to the bed rocker arm to the camshaft crankshaft to the gear train piston to the crankshaft D
A
distributing the fuel to all parts of the combus 959The term‖ proper metering‖, as applied to a diesel fuel injection system, can be best defined as ______
delivering the same quantity of fuel to each c maintaining the metering adjustment for a reas timing fuel injection to obtain maximum powe
960
The rate of heat transfer in a water-tube auxiliary boiler can be increased by ________.operating the boiler at less than normal water installing fins on the firesides of water-tubesincreasing the amount of excess air to the bu treating the boiler water with chemical oxygen B 961
In a diesel engine, pistons are attached to the crankshaft by ________.push rods lash adjusters connecting rods piston guides C 962
A diesel engine using lube oil with too high a viscosity will exhibit ________.increased starting difficulty in cold weatherincreased oil consumption thickening at higher operating temperatures m inimal friction losses A 963
Immediately after any diesel engine is started, the engineer should check the ________.crankcase pressure lube oil pressure saltwater pressure exhaust temperature B 964
In diesel engines designed with a crosshead, the motion of the piston rod can be described as ______reciprocating at the piston pin, rotary at the c reciprocating at the crank pin, rotary at the pist straight reciprocation straight rotation C 965
When reassembling the bowl of a disk-type centrifuge, the bowl or locking ring is rotated ________.clockwise, due to the bowl rotating clockwise clockwise, due to the bowl rotating countercloc counterclockwise, due to the bowl rotating cl counterclockwise, due to the bowl rotating co C 966
Load control on a diesel engine is accomplished by ________.regulating the speed of the turbocharger rotating the fuel injector pump plunger regulating the speed of the fuel oil transfer p changing engine timing B 967
Auxiliary boilers are divided into several classifications, one of which is ________.water-tube supercritical circulation water-tube forced circulation fire-tube controlled circulation fire-tube express circulation B 968
Engine displacement is equal to the cylinder ________.area times the stroke area times the stroke, times the number of cyli volume times the stroke volume times the stroke, times the number o B 969
In a diesel engine, excessive cylinder liner wear will cause ________. ① increased blow-by; ② wear between the piston ring and groove.① only is correct ② only is correct both ① and ② are correct neither ① or ② are correct C 970
The diameter of a piston is usually less at the crown than at the skirt, in order to ________.facilitate the installation of piston rings allow for the expansion of the piston during ope prevent crankcase vapors from entering the reduce wearing of the upper cylinder liner B 971
The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-c turbocharger stalls exhaust pressure increases air charge density decreases scavenge effect increases C 972
What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the p Rapid increase in temperature with constant Rapid increase in pressure with constant temp Rapid increase in pressure and temperature Rapid increase in volume and decrease in pr C 973
Successful combustion inside the cylinders of a diesel engine is dependent upon ________.fine atomization high temperature good mixing of fuel and air all of the above D 974
Which of the combustion parameters listed is used in a diesel engine, but NOT related to the injection Atomization Metering Effective stroke Penetration C 975
An advantage of aluminum pistons, when compared to cast iron pistons is ________.greater high temperature strength better heat conductivity greater weight per cubic inch increased resistance to wear B 976
In describing engine operation, what does the term ―cycle‖ mean?The sequence of events that produce a powe One rotation of engine crankshaft One stroke of piston All of the above.A 977
Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits, may cause low compression pressure increased piston wear increased cylinder lube oil consumption poor contact between compression rings and B 978
Diesel engine exhaust gas temperature can be used to determine individual cylinder ________.performance horsepower output fuel consumption scavenge effect A 979
Which statement about diesel engine combustion is true?Combustion does not begin until the piston s Maximum combustion pressure is reached bef Turbulence in the cylinder causes a delay in Maximum cylinder firing pressure is not deve D 980
Which of the listed design features is the most common to a two-stroke / cycle low-speed main propuls Crosshead construction Cross-scavenging air flow Trunk type piston Single reduction gearing A 981
All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are low Excessively early injection timing Combustion knock Leaking piston rings Light load D 982
Proper atomization of fuel in diesel engine combustion chambers will ________.affect the injection pressure improve combustion reduce compression pressure decrease power output B 983
The ability of a fuel particle to travel into the combustion chamber before burning is called ________.p enetration permanence turbulence atomization A 984
The effective stroke of a constant-stroke, individual, fuel injection pump is varied by the ________.control rack delivery valve governor speed plunger crossbar A 985
Insufficient piston cooling for a large, low-speed, main propulsion diesel engine burning heavy fuels, ca high temperature corrosion and burning off o dangerous thermal expansion of the piston skir excessive crosshead temperatures change in fuel cetane number A 986
A piston in a four-stroke / cycle diesel engine makes four strokes during each ________.crankshaft revolution mechanical cycle of operation period of two combustion cycles cycle of two events
B 987
The diesel engine valve subjected to most severe conditions of service is the ________.cylinder exhaust valve air starting valve air inlet valve cylinder relief valve A 988
The lower section of a piston is called the ________.land skirt crown plate B 989
Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase TBN number viscosity temperature foaming C 990
A change in the degree of fuel atomization in a diesel engine would most greatly affect ________.air turbulence fuel penetration fuel spray angle fuel injection rate
B 991
Which of the following devices is a common basic element with nearly all mechanical governors?Power piston Control rack Weights acted on by centrifugal force Isochronous droop spring C 992
Theoretical perfect combustion in a diesel engine yields by-products of ________.aldehydes and carbon dioxide water vapor and carbon monoxide nitrogen and carbon monoxide water vapor and carbon dioxide D 993
In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be take lube oil pump suction line lube oil pump discharge line bottom of the lube oil sump outlet from the lube oil header C 994
Diesel engine exhaust temperatures may be used to indicate ________.leaking exhaust valves an overloaded cylinder a clogged injector nozzle all of the above D 995
In a diesel engine, an extremely leaking exhaust valve can cause ________.misfiring pre-ignition interrupted scavenging reduced scavenging A 996
What is the term given to the process of breaking up fuel oil into very fine particles for better combustio Settling Straining Spraying Atomizing D 997
For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed mea An increase in compression ratio will increas An increase in compression ratio will decrease A decrease in compression ratio will decreas A decrease in ignition lag will increase the co B 998
Turbulence in a diesel engine cylinder is of major importance in providing ________.proper fuel metering complete fuel / air mixing minimal fuel penetration proper fuel timing B 999
The required amount in the change of speed necessary before a governor will make a corrective move speed droop sensitivity stability promptness B 1000
Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater The amount of fuel injected will be increased The start of injection will be retarded.The nozzle will permit fuel to dribble.The spray pattern will be distorted.B 1001
Exhaust valve grooving and corrosion is caused by certain components of residual fuel oil. These com v anadium carbon copper ash A 1002
Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when t high temperature and a high viscosity high temperature and a low viscosity low temperature and a high viscosity low temperature and a low viscosity B 1003
High firing pressures and a low exhaust temperature in a diesel engine may result from ________.decreased piston to cylinder head clearance increased exhaust back pressure early fuel injection timing low scavenge air temperature C 1004
Poor combustion in a diesel engine can be caused by ________.high compression pressure low intake air temperature low exhaust pressure high scavenge air temperature D 1005
The longer the ignition delay period occurs in a diesel engine, the ________.less fuel will enter the cylinder lower will be cylinder compression temperature more complete will be fuel combustion more rapid will be the rise in combustion pre D 1006
The load is always placed on the lower half of the main bearings in a / an ________.two-stroke / cycle engine four-stroke / cycle engine reverse cycle engine double .acting engine A 1007
Which term describes piston pins having bearing surfaces in both the piston bosses and connecting r Stationary Full floating Semi-floating Free rolling B 1008
Diesel engine fuel oil leakage should be drained and additional precautions provided to ________.return this oil to the proper storage tank prevent contamination of lubricating oil by fuel ascertain an accurate measurement of this le drain cooling water system components B 1009
Which of the following devices is common to both mechanical and hydraulic governors?Direct linkage between the ball-head and fue A servomotor. A compensating device.Flyweights.D 1010
Which of the following conditions will tend to increase the ignition delay period of combustion in a com U sing a fuel oil with a higher cetane number.Decreasing the air charge temperature.Reducing the injected fuel oil drople size.Increasing the compression ratio.B 1011
When is fuel injected into a cylinder of diesel engines?Before air in the cylinder is compressed.After air in the cylinder is compressed.After combustion gases in the cylinder have As air taken into the cylinder.B 1012
Injection lag can be caused by ________.improper timing of the intake valves setting of the pump plunger compressibility of the fuel position of the needle valve C 1013
If the raw water supply pressure for a diesel engine cooling system is below normal, you should check broken thermostat clogged sea strainer blown head gasket cracked head B 1014
A change in the degree of fuel atomization in a diesel engine cylinder has the greatest effect on the __cylinder air turbulence fuel spray angle fuel injection rate combustion in that cylinder D 1015
The rate of pressure rise during the period following fuel ignition process in a diesel engine, is influenc percent of CO2range of inflammability theoretical fuel / air ratio length of the ignition delay period D 1016
On most diesel engines, the governor controls the output speed by ________.controlling the amount of fuel injected into the varying the speed of the turbocharger adjusting the compression ratio changing the timing of the fuel injection cam A 1017
Why is it necessary to compress the air charge in the cylinders of a diesel engine?To ignite the fuel.To insure pumping losses are held to a minimu To increase fuel consumption.To keep exhaust temperature low.A 1018
The average exhaust temperature of a two-stroke / cycle diesel engine with a turbine-driven superchar two-stroke / cycle diesel engines have a high four-stroke / cycle diesel engine exhaust is coo two-stroke / cycle diesel engines have a lowe the opening of the two-stroke / cycle diesel e C 1019
Diesel fuel oil having a low cetane rating can result in ________.improved cold weather starting smoother engine operation combustion knock reduce ignition lag C 1020
The governor controlling a diesel engine modulates crankshaft RPM by adjusting the ________.intake air supply turbocharger speed fuel injection pumps engine speed droop C 1021
High exhaust temperature and black smoke exhausting an auxiliary diesel engine can be caused by __engine overload low combustion temperature plugged fuel nozzle holes excessive compression pressure A 1022
Any increase in the exhaust back pressure of a four-stroke / cycle diesel engine will ________.reduce engine horsepower output aid in silencing the exhaust noise increase the mean effective pressure contribute to effective cylinder scavenging A 1023
The driving force of a propeller is transmitted to the hull through the ________.bevel gear teeth helically cut gear teeth sleeve bearings thrust bearing D 1024
If fuel injection to a four-stroke / cycle diesel engine begins earlier than designed, ignition may be delay cylinder compression pressure may not be h cylinder compression temperature may be too fuel oil injection pressure may not be high en scavenge and purge process incomplete A 1025
Which of the following problems can cause fluctuating pressures in the closed cooling system of a ma Defective temperature controls in the system Cavitation in the cooling water pump.Opened vent in the cooling system.Restricted water passages in the engine.B 1026
Which of the following statements concerning the factors affecting ignition delay is correct?An increase in intake air temperature will incr An increase in coolant temperature will decrea An increase in combustion chamber turbulen An increase in compression ratio will ignition B 1027
An increased pressure differential between the inlet and outlet of a strainer usually indicates the straine holed fouled clean dry B 1028
A diesel engine with a combustion chamber located between the crowns of two pistons is known as a /double-acting engine opposed pistons engine single-acting engine horizontal acting engine
B 1029
Persistent knocking in one cylinder of an eight cylinder diesel engine would MOST likely be caused by using fuel oil with low cetane number a badly worn piston pin a loose flywheel key a loose bed plate bolt B 1030
To successfully reduce an excessively high diesel engine exhaust gas temperature, you should _____reduce the engine driven fuel pump outlet pre retard the fuel injector timing to reduce power i ncrease the fuel rack setting reduce the load on the engine D 1031
Which of the two events listed occurs simultaneously in a two-stroke / cycle diesel engine?Exhaust and scavenging Scavenging and compression Ignition and expansion Exhaust and compression A 1032
To determine if the lube oil filter elements need changing, ________.open the filter and inspect the elements check the lube oil pump discharge pressure check the lube oil header pressure check the pressure drop across the filter D 1033
Diesel engine control can be obtained by the bridge ________.at any time only after the engine room control station is sw whenever the secondary station is switched with the approval of the chief engineer only B 1034
The direct cause of a crankcase explosion can be attributed to ________.extremely hot scavenge air excessive cooling water temperature an overheated bearing excessive lube oil in the crankcase C 1035
Combustion knock can occur in the cylinders of a diesel engine under any condition permitting ______a shortened ignition delay period a lean fuel / air mixture excess fuel in the combustion chamber rapid vaporization of injected fuel droplets C 1036
Many lube oil filters have pressure gages installed on both the inlet and outlet in order to indicate the p slowly increase slowly decrease remain the same have no difficulty on filter operation A 1037
Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse f wheelhouse control station engine room control station captain's office chief engineer's office B 1038
A thrust bearing is used with a propulsion diesel engine to ________.control axial movement of the crankshaft transmit engine thrust to the propeller shaft absorb vibrations in the propeller shafting prevent propeller thrust from being transmitte A 1039In a large slow-speed propulsion diesel engine, the force applied to the piston is ________.against the crosshead during power stroke a against the crosshead during the compression against the crosshead during the power and away from the crosshead during the power a C
1040Combustion knock occurring in a diesel engine can be caused by ________.excessive fuel penetration prolonged injection lag reduced ignition lag prolonged ignition lag D 1041Which of the following problems could develop due to the accumulation of oil vapors the crankcase of Reduced lubrication Poor fuel economy Combustion knock Crankcase explosion D 1042Which of the following statements is a description of the combustion cycle?The mechanics of engine operation The heat process which produces the force to The number of piston strokes involved The mechanical equivalent of heat B 1043The time between injection and ignition of the fuel is known as ________.turbulence lag after burning ratio pre-ignition lag ignition delay D
D 1044In using reduction gears to obtain efficient propeller speeds, ________.they must be located at the after end of the e they can only be used with one engine at a tim t hey eliminate the need for controllable pitch they are connected to the engine with a flexib 1045Lube oil cannot be efficiently filtered if its ________.viscosity is too low temperature is too low pump discharge pressure is higher than the pump capacity is greater than the system's n B 1046 A crack in a cylinder liner can be caused by ________.worn piston rings installation of undersized sealing rings operating the engine at low loads restricted cooling water passages D 1047When oil vapor, oxygen and hot spots are present at the same time within a crankcase, which of the fo Explosion Implosion Misfire Dieseling A
higher combustion pressure is developed C 1048For a given size engine, the two-stroke / cycle diesel engine will deliver more power than a four-stroke it has a longer power stroke more air gets into the cylinder each stroke it develops twice as many power strokes at th
1049The minimum speed an engine must attain before ignition can occur depends upon ________.the type and size of the engine the condition of the engine ambient temperature all of the above D 1050Lube oil filters remove contaminants from oil more efficiently if the oil being filtered is ________.heated to reduce viscosity cooled to increase viscosity pumped rapidly through the filter pumped through the filter under high pressu A 1051An automated diesel engine should normally shut down due to ________.low lube oil temperature high ambient air temperature low lube oil pressure high exhaust system back pressure C 1052Which of the listed conditions is most likely to cause a crankcase explosion? A high cooling water temperature Fuel dilution of the lube oil Excessive engine speeds Improper lube oil viscosity B
fuel injectors may be damaged by foreign pa dirty fuel will clog the intake air filter C 1053Proper filtering and straining of fuel oil is important because the ________.fuel oil pump will over-speed if dirt is not rem f uel oil transfer pumps cannot tolerate small am
1054Lube oil filters remove contaminants more efficiently if the oil being filtered is ________.under high pressure under low pressure heated to reduce viscosity cooled to increase viscosity C 1055Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ra Lube oil pressure and temperature Jacket water pressure and temperature Engine over-speed Lube oil sump level D
B 1056What is the function of the thrust bearing?Prevents lateral movement of the slow speed Transmits propeller thrust to the hull.Keeps spring bearings in line.Prevents main reduction gear axial movemen 1057Failure to ensure proper venting of the cooling system of a diesel engine can result in ________.excessive air charge density priming in the expansion tank failure of raw water pump shaft seals local overheating and / or internal corrosion D 1058The ability of the governor to prevent fluctuations in engine speed is termed ________.sensitivity stability promptness speed droop B
B
speeder spring alone actuates the fuel contro 1059In a simple mechanical governor, the ________.centrifugal force rotates the ball-head flyweight centrifugal force is balanced by sprin flyweight centrifugal force is balanced by hyd
1060If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system,loss of suction in the circulating pump leak in the primary cooling system broken raw water pump shaft burned or cracked piston in one cylinder B 1061 A diesel engine piston ring face in direct contact with the ________.top of the ring groove cylinder liner oil film bottom of the ring groove back of the ring groove B 1062The function of diesel engine piston compression rings is to ________.prevent piston side thrust prevent engine friction losses transmit heat from the piston to the cylinder l remove oil from the cylinder combustion spa C 1063 A diesel engine is operating with excessively high exhaust temperatures at all cylinders. To correct this reduce the engine load increase the cooling water flow increase the lube oil pressure adjust the fuel rack A
the pressure of gases developed specially designed parts connected to a shaf the concept of reciprocity B 1064In a diesel engine, internal combustion causes the piston to be moved by ________.the simple admission of fuel and air into the c
1065 A secondary function of diesel engine piston rings is to ________.reduce friction losses in the engine absorb the piston side thrust prevent cylinder liner wear prevent excess lubricant from reaching the c D 1066Barrel face, taper face, grooved, and chrome plated are all types of diesel engine ________.pistons piston rings piston skirts cylinder liners B
C 1067Diesel engines are classified as reciprocating internal combustion engines because they ________.use energy from fuel burned outside their cyl burn fuel in a combustion chamber that moves burn fuel in a chamber where its energy mov use a continuous combustion process to imp 1068 A main propulsion diesel engine is normally shut down by ________.shutting off the air supply over-speeding the engine securing the fuel supply securing the ignition system C 1069The total air capacity for non-reversible main engines is to be sufficient for ________.six consecutive starts eight consecutive starts ten consecutive starts twelve consecutive starts A 1070The thermal energy produced by an internal combustion engine is transformed into ________.combustion energy internal energy external energy mechanical energy D
should be completed shortly after passing to D
when fuel injection has been completed when fuel vaporization has been completed should efficiently continue through the after b
1071The most rapid period of fuel combustion in a diesel engine cylinder should begin just before the piston
1072The sealing surfaces of a diesel engine piston ring are considered to be the faces in contact with the c bottom back top side A
Low loading of the cylinder Excessive cooling of that piston Sluggish ring action on the piston a mechanical defect in a working part D 1073One cylinder of a diesel engine is persistently knocking and does not cease when the fuel supply to tha
1074Routine monitoring of a diesel engine should include ________.checking for leaks checking temperatures and pressure listening for abnormal noises all of the above D 1075If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you compression pressures are below normal lube oil is diluted with fuel oil cranking speed is too low exhaust system is partially restricted A 1076When would the available energy of the exhaust gases of a two-stroke / cycle diesel engine be insuffic During operation at low speed During operation at rated speed, but low power During acceleration All of the above.D 1077Electrically operated safety, devices on auxiliary diesel engines function to stop the engine by _______increasing the volume of intake air shutting off the fuel supply increasing the engine back pressure over-speeding the engine B 1078The compression ratio of a diesel engine refers to the ratio between the ________.piston area to connecting rod length cylinder volumes at bottom dead center and at engine cylinder size to piston size the number of compression strokes for a giv B 1079White smoke exhausting from an operating diesel engine may indicate ________. a cracked liner burning lube oil an overloaded engine insufficient combustion air A 1080If the main engine of an unattended engine room shuts down automatically, it will be indicated by an al at each control station in the chief engineer's quarters in the captain's quarters All of the above are correct D
D 1081In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once two crankshaft revolutions in a two-stroke / c two power strokes in a two-stroke / cycle engin one power stroke in a two-stroke / cycle engi two piston strokes in a two-stroke / cycle eng 1082Engine protection by means of an alarm or shutdown control can be obtained with devices that are sen temperature pressure engine speed all of the above D
at rated engine RPM at 95% of rated engine RPM at 95% of a properly adjusted governor RPM B 1083Maximum horsepower of a diesel engine is attained ________.when the engine RPM is pulled down by over
B
transmit heat from the piston to the cylinder l damp out fluctuations of the piston side thrus
reduce the amount of lube oil burned in the com
1084The main purpose of the piston oil scraper rings is to ________.seal the space between the piston and the lin
1085What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?Spark plug Heat of compression Carburetor Glow plug B 1086The highest pressure in a diesel engine cylinder normally occurs ________.at TDC before TDC after TDC during air starting C 1087How many power strokes per crankshaft revolution are there in an eight cylinder, two-stroke / cycle die One Two Four Eight D 1088The most important factor in engine performance is the actual power output at the end of the cranksha indicated horsepower brake horsepower net horsepower friction horsepower B 1089When fuel oil has seriously contaminated a diesel engine lubricating oil, you should ________.filter to remover the fuel oil use the settler to remove the fuel oil remove the fuel oil by centrifuging drain and then renew the lube oil supply D 1090 A vane pump belongs to ________ according to its working principle.reciprocating pump positive displacement pump centrifugal pump centripetal pump B
positive displacement ejector centrifugal air compressor A 1091Through a ________ pump, the liquid is transferred from the suction to the discharge by the mechanic
1092 A mono-pump is a single-screw pump. That means it consists of ________ rotor (s).one two three four A 1093The gear and screw pumps are classified as ________.variable stroke pumps multistage pumps positive displacement pumps triple-ported pumps C 1094Gear pumps are of positive displacement type pumps because they discharge a near constant amount depending on in relative to regardless of because of C 1095 A gear pump belongs to ________ according to is working principle.reciprocating pumps positive displacement pumps centrifugal pumps centripetal pumps B 1096The pressure head of a pump is given in the unit of ________.kg MPa meter fluid column None of the above is true.C 1097 A centrifugal pump produces the required pressure energy by means of a rotating ________ provided propeller impeller circumference screw B 1098The discharge flow of a reciprocating pump is ________.steady in pulsation continuous large B 1099In a ________ the center screw is driven and the outer screws idle.single screw pump double-screw pump triple screw pump centripetal pump C 1100Screw pump belongs to ________ according to its working principle.reciprocating pumps positive displacement pumps centrifugal pumps centripetal pumps B 1101The amount of fluid delivered by a screw pump can be regulated by ________.throttling the pressure line changing the speed of the rotor either A or B None of the above is true.B
kinetic / pressure kinetic / essential pressure / kinetic pressure / height A 1102While flowing through the volute in a centrifugal pump, part of the ________ energy of the liquid is con
1103The amount of fluid delivered by a centrifugal pump can be regulated by ________.throttling the pressure line changing the speed of the rotor either A or B None of the above is true.C 1104The amount of fluid delivered by a reciprocating pump can be regulated by ________.throttling the pressure line changing the speed of the piston either A or B None of the above is true.B 1105The amount of fluid delivered by a positive displacement pump can be regulated by ________.throttling the pressure line changing the speed of the driving rotor either A or B None of the above is true B
① only① and ②①, ② and ③② and ③B 1106Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? ① reciprocating; ② rotary; ③ centrifugal.
1107The amount of fluid delivered by a helical pump can be regulated by ________.throttling the pressure line changing the speed of the rotor either A or B None of the above is true.B 1108 A positive displacement pump is that where the volume of the pump chamber is alternately increased t draw the liquid in / force the liquid out force the liquid out / draw the liquid in suction / draw deliver / outlet A 1109Throttling in the ________ line of a centrifugal pump involves the risk of the pump cavitation.suction exhaust pressure discharge A 1110As for a hydraulic single action vane pump, the inner wall of the stator is usually of ________ shape.circular elliptical rectangular hexagon A
① only② only① and ②①, ② and ③A 1111As for a hydraulic vane pump, which of the following is in contact with the vanes during working: ① the rotor; ② the pump shaft; ③ the external surface of the housing.
1112Shaft sealing in a centrifugal pump can be effected by ________.the mechanical seal packed stuffing boxes either A or B neither A nor B C 1113 A reciprocating pump belongs to ________ according to its working principle.injector pumps positive displacement pumps centrifugal pumps centripetal pumps B 1114 A ________ pump is that where the volume of the pump chamber is alternately increased to draw the injector positive displacement centrifugal centripetal B
All of the above are true.C 1115What is the purpose of a relief valve?to fill 2 tanks at the same time to use pump at a higher pressure to return liquid to suction side if discharge va
1116The pump discharge pressure will be considerably higher than the pressure at the ________.pump entry branch outlet pipe impeller None of the above is true.A 1117Which of the following pumps belongs to centrifugal pump?Piston pump Screw pump Diffuser pump Water-ring pump C 1118The volute pump is one in which the impeller ________.discharges into a gradually widening channe has stationary diffuser vanes produces no kinetic energy All of the above are true.A 1119In ________ pumps a closed discharge valve will cause bursting discharge pressure.centrifugal plunger injector water B
1120Which of the following pumps are self-priming, and can deal with liquid from a level below the pump; ① ejector; ② screw; ③ centrifugal.
① only① and ②①, ② and ③② and ③B
1121The amount of fluid delivered by a gear pump can be regulated by ________.throttling the pressure line changing the speed of the rotor either A or B None of the above is true B
1122Attempts are made to eliminate axial thrust in centrifugal pump by ________.providing the impeller with balancing holesthe use of symmetrical impeller neither A nor B either A or B D
① and ②①, ② and ③① and ③② and ③C
1123Which of the following pumps will build up a bursting pressure or stall their motors if the discharge val① gear; ② centrifugal; ③ screw.
① and ②② and ③①and ③①, ② and ③D
1124Which of the following operating features do displacement pumps bear if they are working under no-ca① output is almost direcely proportional to speed; ② they are self-priming; ③ they will develop a discharged pressure equal to the resistance to be overcome, irrespective of speed. 1125The ________ pump discharges a nearly constant amount of liquid regardless of pressure.mixed-flow axial-flow centrifugal displacement D
1126Which of the following pumps is used where a relatively high pressure and small capacity are required Volute pump Diffuser pump Regenerative pump All of the above C
fitted with a relief valve A
1127Some pumps use packing as sealing gland. The gland should be ________.slack enough to allow slight leakage of fluid slightly clocked brought up tight so as not to allow any leakag
1128Air chambers are usually fitted to reciprocating pumps in order to ________.increase discharge pressure increase suction vacuum develop pulsation flow keep a steady rate of flow D
1129The pipe friction and the resistance will ________ as a result of an increase in the amount of fluid flow reduce rise raise fall B
①,②②,③①,②,③② only C
1130Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pu① Its discharge is continuous; ② It has no internal valves; ③ Upon accidental closing of discharge valve, excessive pressure will not build up.
① only① and ②② and ③①, ② and ③D
1131Which of the following pumps are self-priming, and can deal with liquid from a level below the pump: ① reciprocating; ② vane; ③ gear.
1132Centrifugal pumps can be designed with a number of impellers ________ to attain a high final delivery in series in parallel either A or B None of the above is true A
1133If fan operating auxiliary boiler has a water pH reading of 7, you should ________.bottom blow the boiler treat the water with caustic soda treat the water with chemical scavengers reduce the water alkalinity to recommended r B
1134The internal part of the boiler, if found ________, has to be chemically washed by yard.deformed rusted cracked scaled D
1135The internal part of boiler should be welded by yard if found ________.scaled cracked shape changed deformed B
1136The tube in a boiler should be blinded if found ________.scaled informed leaky deformed C
1137In a ________ boiler the water flows through the inside of the tubes while the hot gases pass around t water-tube fire-tube exhaust gas none of the above A
water-tube fire-tube exhaust gas None of the above is true B
1138In a ________ boiler the hot gases from the furnace pass through the tubes while the water is on the o
1139________ are mounted in pairs to protect the boiler against overpressure.Safety valves Water tubes Steam stop valves Blow down valves A
1140The furnace of a oil fired boiler should be ________ before the operating burner is lit.filled with water purged cleared of air None of the above is true.B
rise and fall with the steam demand B
1141When steam is being raised on a boiler, the water level will normally ________.drop as the boiler warms up rise as the boiler warms up remain unchanged until the boiler is hot enou
1142The donkey boiler may be given a bottom blow ________.to raise water level only while making steam to remove scum when fire are secured D
1143The water level in a steaming auxiliary boiler will always ________.rise when the steam pressure is increasedremain constant as long as the feed pump ope fall when the steam pressure is decreasedvary as the steam demand changes D
1144The boiler feed water check valves are located on the ________.feed pump suction line hot well shell of the feed heater feed lines to the boiler D
1145If in doubt as to the true water level when a boiler is being oil-fired, you should ________.take no measures extinguish the fire as soon as possible feed water to the boiler open the blow down valve B
1146The boiler feed pump discharge pressure is higher than the steam drum pressure to ________.ensure feed water flow into the boiler keep the steam drum pressure high prevent water hammer in the feed line help the feed water flash to steam A
1147Safety valves on a boiler vent to the ________.fuel tank bilge atmosphere auxiliary exhaust line C
an auxiliary boiler A and B neither A nor B B
1148 A donkey boiler is ________.one to supply steam to the main propulsion tu
1149The safety valves should be tested and adjusted when the boiler survey is ________.completed carried out cleaned steamed B
1150You should frequently compare drum-mounted and remote-reading water level indicators. ________ b Descriptions Discrepancies Different Deflections B
1151Impurities from the boiler water surface can be removed through the ________.safety valve blow down valve scum valve feed check valve C
an diesel oil heater a waste heat boiler a fresh water generator all the above B
1152In motor ship, ________ is often used to recover some of the heat carried in the exhaust gases from th
1153________ will be used to blow away the combustion products from the tube surfaces.The blow down valve The scum valve The air release cock The soot-blower D
1154Latent heat changes the ________ of water.physical state temperature atmospheric pressure sensible pressure A
latent heat of condensation latent heat of vaporization latent heat of saturation sensible heat of condensation A
1155The amount of heat released by steam when it changes to water at the same temperature is called ___
①① and ②②neither ① nor ②A
1156As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses① secure oil to fires; ② increase feed pump pressure.
1157As for an oil-fired boiler too much air would be indicated by ________.yellowish flame golden yellow flame milky flame brilliant white flame D
1158W. H. R stands for ________.Water Head Register Water Heater Re-circulating Waste Heat Recovery Waste Handle Reference C
1159When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will red
swell shrinkage flash off lack of water B
1160 A dazzling white burner flame in the boiler furnace indicates ________.no combustion deposits in the fuel excessive air in the fuel cold fuel oil C
1161The water level showing in a boiler water gauge glass is usually ________ during working.higher than the actual drum water level equal to the actual drum water level increasing due to steam condensation in the lower than actual drum water level D
① and ②① and ③② and ③①, ② and ③D
1162Which of the following may hardness of the boiler water cause? ① scale formation; ② tube failure; ③ corrosion.
lube oil fuel oil turbine oil grease B
1163The separation of impurities and water from ________ is essential for good combustion of diesel engin
1164High-speed rotation in a centrifugal purifier can produce a force ________ the force of gravity.many thousand times larger than the same as many thousand times smaller none of the above A
1165________ are used to ensure that ships don't discharge oil when pumping out oily water from any oil c Boiler Incinerator Oily water separator Sewage treatment unit C
1166Oil water separators are used to ensure that ships don't discharge oil when pumping out ________.ballast water boiler water bilge water sewage water C
rather than other than in addition that except for B
1167The bilge main is arranged to drain any watertight compartment ________ ballast, oil or water tanks an
1168Emulsification of oil will occur when mixed with ________.air black oil water ice cream C
1169 A centrifuge arranged to separate two liquids is known as ________.an oily water separator a purifier a centrifugal compressor a clarifier B
1170 A centrifuge arranged to separate impurities and small amounts of water from oil is known as _______an oily water separator a purifier a centrifugal compressor a clarifier D
1171When a clarifier is running the impurities and water collect at the bowl ________.center periphery inlet upper parts B
purifying batch long period temporary B
1172For many years marine centrifuges were designed for ________ operation, that is the machines were r
1173For a purifier, changing to a gravity disc with larger hole diameter will move the interface towards the _bowl periphery bowl center upper surface lower surface A
bowl periphery bowl center upper surface lower surface B
1174For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the _
1175In an oily water separator the oil will travel ________ to the oil collecting spaces.upwards downwards outwards forwards A
1176When started, a complete oily water separating unit is first filled ________. The oily water mixture is th with dirty water with clean water by oily water by mixed water B
1177 A high rate of separation between oil and water is favored by ________.large size of oil globule low temperature high viscosity high flow rate A
1178 A hydraulic motor may be driven by ________.an electric motor a diesel engine a compressor oil D
1179In a hydraulic system, ________ are used to protect the system from over pressure.stop valves check valves safety valves reducing valves C
1180________ are used for cargo handling.Cranes Mooring winches Windlasses Foreman A
1181Among the basic categories of equipment, which of the following are used to allow the hydraulic energ hydraulic pumps valves hydraulic cylinders hydraulic motors B
1182________ are used to handle anchors and chains.Cargo winches Mooring winches Windlasses Cargo hatches C
lift put take hold D
1183The drive motor will have a brake arranged to fail-safe, i.e. it will ________ the load if power fails or ma
1184________ are used for hauling in or letting out the wires which fasten the ship to the shore.Cargo winches Mooring winches Windlasses Cargo hatches B
cast put hold let out C
1185The drive motor will have a brake arranged to fail-safe, i.e. it will ________ the load if power fails or ma
The hydraulic pumps Valves Hydraulic cylinders Hydraulic motors A
1186Among the basic categories of equipment, which of the following are used to convert mechanical into h
1187Among the basic categories of equipment, which of the following is used to convert hydraulic energy in Hydraulic pumps Valves Hydraulic cylinders Hydraulic motors D
1188________ are used to limit the pressure in any particular portion and mainly control the pressure after Relief valves Check valves Safety valves Reducing valve D
1189The rotor of the hydraulic motor rotates at a speed proportional to the ________.flow of oil pressure of oil A and B temperature oil A
1190What type of valve is used to direct the flow of hydraulic fluid?Relief valve Direction control valve Stop valve Pressure control valve B
1191External and internal leakage in hydraulic systems may be caused by ________.unusual vibration excessive worn parts abnormal pressure any of the above D
1192In a general cargo crane, ________ is fitted to raise or lower the jib.the slewing motor the luffing motor the hoisting motor none of the above B
1193Among the basic categories of equipment, which of the following are used to convert the hydraulic ene Hydraulic pumps Valves Hydraulic cylinders Hydraulic motors C
1194The single acting cylinder is the simplest form where pressure is applied to the full area of the piston h contraction retraction expansion shrinkage B
1195In an ordinary cargo crane, ________ is fitted to rotate the crane.the slewing motor the luffing motor the hoisting motor none of the above A
1196The crane is usually mounted on a pedestal to offer adequate ________ to the operator.time space length visibility D
1197In a general cargo crane, ________ is fitted to lift the cargo load.the slewing motor the luffing motor the hoisting motor none of the above C
1198When the union purchase derrick is operated, one derrick is positioned over the quayside and the othe dock hold pedestal machinery space B
1199Cargo handling unit is rated according to the ________ to be lifted.cargo crane jib safe working load oil pressure C
1200________ play a very important part in hydraulic systems by preventing interaction between different p Motors Check valves Safety valves Reducing valve B 1201Which of the following can be used in hydraulic transmission system?Hydraulic oil Animal oil Light oil Fuel oil A 1202________ is the production of pure water from sea water by evaporation and re-condensing.Evaporation Circulation Condensation Distillation D 1203When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and _____dispose dissolve heat dissipates C
a brine pump an air ejector a feed pump distillate pump A 1204With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by _
1205In vacuum boiling evaporator, the fresh water generated is pumped out by ________. a brine pump an air ejector a feed water pump a condensate pump D
to decrease scale formation for better cooling effect for more economical purpose to raise vacuum C 1206When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as fe
to cut down the amount of cooling water need
to prevent an excess amount of cooling water f to supply hot water of the evaporator for mor None of the above is true.C 1207When distilling salt water the cooling water discharging from the distiller is fed back evaporator as feed
boiling off flash evaporation condensation none of the above B 1208The process during which liquid containing a reasonable amount of sensible heat at a particular pressu
1209Compressed air is used on board ship ________.for starting diesel engines in pneumatic control system in pneumatic tools All the above are true.D 1210The starting air bottle should be pumped up to maximum pressure by the ________ before start of the air compressor refrigeration compressor vacuum pump purifier A 1211The primary task of the compressed air system is to deliver the starting air necessary for ________.starting the M. E.starting the emergency electric alternator driving the main turbine driving the turbocharger A
below above equal to much larger than B 1212The evaporating pressure in R22 vapor compression refrigeration plant should be ________ atmosphe
1213Hot gas defrosting uses the hot gas from ________ to defrost the evaporator.starting air bottles diesel engines boilers refrigeration compressors D 1214In a refrigeration plant the ________ need defrosting.fan compressor condenser evaporator D
Refrigerator Refrigerant Cooling medium Brine B 1215What is the substance called which can readily be converted from a liquid into a vapor, and also from a
1216 A fluid coil will ________ large quantities of heat when it changes state from a liquid to a vapor.release absorb develop regenerate B 1217 A fluid coil will ________ large quantities of heat when it changes state from a vapor to a liquid.release absorb develop regenerate A 1218The latent heat of evaporation is dissipated in the ________ in a compression refrigeration system.evaporator condenser expansion valve compressor B 1219 A refrigerant boils and vaporizes in the ________ in a compression refrigeration system.liquid receiver compressor condenser cooling coil D 1220 A refrigerant gives up heat when it goes through ________.condenser regurgitate evaporator boil coil A 1221It should be ensured that only ________ vapor is handled by the refrigeration compressor.humidity dry steam oil B 1222In the refrigeration compressor the temperature of the vapor is ________ by compression.raised risen reduced maintained constant A 1223If the capacity of the refrigeration compressor is too small, the excess vapor will accumulate in the eva rise fall be maintained constant None of the above is true.A 1224If the capacity of the refrigeration compressor is too large, the saturation temperature will ________.rise fall be maintained constant None of the above.B 1225In the process of ________, liquid changes into gas.evaporation frosting condensing compressing A 1226Since heat will not flow freely from a body at a ________ temperature to another at a ________ tempe lower / higher shallower / deeper larger / smaller higher / lower A 1227In a compression refrigeration plant the refrigerant flows from the expansion valve and through the ___compressor condenser throttle valve evaporator D 1228The ________ compressor and its electrical motor are entirely housed in a gas-tight casing.open-type hermetic A and B None of the above.B 1229The heat used to change a liquid to a vapor is called ________.latent heat of fusion latent heat of vaporization specific heat of vaporization latent heat of the gas B 1230Both the temperature and the pressure of the refrigerant are increased in the ________.compressor condenser evaporator expansion valve A 1231The compressor suction line conveys the refrigerant vapor from ________ to ________.condenser / evaporator evaporator / compressor compressor / condenser None of the above.B 1232The thermal expansion valve controls the amount of refrigerant that is allowed to flow to the ________.compressor cooling coils condenser receiver B 1233When the temperature of the refrigerant flowing out from the condenser is below the condensing temp dry wet super-cooled superheated C 1234During working, thermostatic expansion valve should be ________.either all the way open or all the way closed normally fully open throttled depending on load controlled by liquefied pressure C 1235The expansion valve on a Freon system controls the ________.superheat of the gas leaving the compressor back pressure in the evaporator temperature of the icebox superheat of the gas leaving the evaporator D 1236 A feeler or thermal bulb is used for the expansion valve to ________.detect the temperature detect the pressure heat the refrigerant accelerate the refrigerant A 1237In a compression refrigeration plant the refrigerant is under low pressure in the ________ and under h compressor / condenser condenser / evaporator throttle valve / evaporator evaporator / condenser D 1238The boiling and condensation points of refrigerant mainly depend on the ________ exerted upon it.temperature density volume pressure D 1239The function of ________ in a refrigeration plant using Freon is to move moisture from all refrigeration filter filter drier heat exchanger air cooler B 1240The saturation temperature of the refrigerant must be ________ that required in the evaporator refriger above below equal to None of the above.B 1241After passing through the expansion valve the refrigerant should be in the state of ________.vapor liquid solid None of the above is true.D 1242The refrigerant flows through the evaporator, where it ________ heat from the refrigerated space.extracts releases gives no absorbs no A
saturated super-cooled wet superheated D 1243In practice, the refrigerant flow after the evaporator is designed to ensure that the vapor leaving the eva
①, ② and ③① and ②① and ③② and ③A 1244Which of the following will be desirable properties of refrigerant? ① non-explosive; ② non-corrosive; ③ that it doesn't react with lubricants
1245In the ________ refrigeration compressor one end of the crank shaft extends through the crankcase h open-type hermetic semi-hermetic all the above A
compressor condenser throttle valve evaporator B 1246In a compression refrigeration plant the hot, high pressure refrigerant gas is cooled by the sea water an
1247What is the function of thermostatic expansion valve in a compression refrigeration system?nonexistent for controlling pressure for controlling superheat for controlling the solenoid valve C 1248In a vapor compression refrigeration the evaporating pressure is maintained constant by the action of t evaporator compressor condenser none of the above B 1249The device used for low-pressure control and high-pressure cutout on a compressor is called a _____cutout controller switch pressure controller cutout switch C
any of ① and ③any of ① and ②any of ② and ③any of ①, ② and ③A 1250Which of the following may cause that the compressor cuts off on high pressure cutout in a refrigeratio① faulty condensing; ② too few refrigerant; ③ high discharge pressure;
① only any of ①, ②and ③any of ① and ③any of ① and ②C 1251Which of the following may cause that excessively warm water leaves the condenser in a refrigeration ① too little cooling water; ② too much cooling water; ③ too warm cooler water.
1252The presence of air in the condenser of a refrigeration system will ________ the condensing pressure increase reduce maintain constant None of the above is true A 1253Which of the following best describes ―overcharge of refrigerant‖?Too much refrigerant.Too little refrigerant.Refrigerant is ran out.Running is over.A 1254What separate the high pressure side from the low pressure side in a refrigeration system?Condenser and thermal expansion valve.king and solenoid https://www.doczj.com/doc/1e17804075.html,pressor and thermal expansion valve.Condenser and solenoid valve.C 1255After fitting back in place the gear wheels, don't forget to ________ them.fulfill eliminate grease bend C 1256The defective places in the furnace ________ with fire bricks.should be paved should be cleaned should be dismantled should be welded A 1257The designed ________ is 20 tons per day, but the fresh water generator can only distil 15 tons at pre displacement weight power capacity D
gravity diameter circumference cylinder B 1258The ________ of the gravity disc is too big. It cause oil to flow through the water outlet. We changed th
1259Water level controllers of the boiler must be kept operable to protect external steam-using plant from w carry of carry down carry on carry over D 1260The shaft and spare parts ________ should be well greased in order to avoid corrosion.in the store room in the cylinder in the scavenge air box in the water box A 1261If a bilge pump failed to build up discharge pressure, you should check for ________.excessive water in the bilges a clogged suction strainer oil in the bilges All of the above B 1262Black smoke coming from a boiler can be caused by ________.low water level high water level excessively high fuel pressure low oil temperature D 1263Moisture should be kept out of an R-12 system because it tends to cause ________.icing of the automatic controls embrittlement of some parts of the automatic c sludge in the lubricating oil all of the above D 1264Air that may enter a refrigeration plant tends to collect in the ________.upper part of the receiver upper part of the condenser down stream end of the cooling coil outlet end of the condenser B 1265Insufficient refrigerant in a refrigeration plant may result in ________.high discharge pressure frosting of the crankcase high temperature of the overboard water low suction pressure of compressor D 1266Which will cause the high pressure cutout to stop the compressor in a R-22 system?Condenser leakage A shortage of liquid refrigerant Excessive frost on the evaporator Not enough condenser cooling water D 1267Black smoke coming from a boiler can be caused by ________.low water level low oil pressure excessively high fuel pressure an improper air / fuel ratio D 1268 A ruptured diaphragm in a thermostatic expansion valve will cause the valve to ________.open close remain in its position flood the evaporator with refrigerant B 1269Which of the following should be recorded in Oil Record Book Part Ⅰ (machinery space operation)?Non automatic discharge overboard of mach Automatic discharge overboard of machinery s A and B.Neither A nor B.C
A and
B Neither A nor B.B 1270Oil Record Book Part Ⅰ shall be provided to ________.every oil tanker every ship of 400 tons gross tonnage and abov
1271The third engineer took the ________ and checked the tank table in the office and recorded all relevan water level sump level ballast tank level ship's trim D 1272Dirty oil must be ________ before being used again.mixed with clean oil purified heated strained B 1273The emergency bilge suction or bilge injection valve is used to prevent ________ of the ship.proceeding overloading collision flooding D
strangers relief valves emergency valves strainers D 1274All bilge suctions must be fitted with suitable ________, which in the machinery space would be mud b
Accidental discharge of oil.Disposal of oil residues.Quantity of water produced by F.W.G.Discharge of dirty ballast or cleaning water fr C 1275Which of the following is NOT on the list items to be recorded in Oil Record Book Part Ⅰ (machinery space operation)?
Height of the machine Temperature of the liquid seal Gravity disc Bowl diameter C 1276Which of the following influences the position of the interface between the liquid seal and the oil in a pu
1277For a L.O. purifier, if the back pressure of the oil outlet is too high, the interface between oil and water be interrupted move downwards move outwards retain original position C 1278When in operation, it is unavoidable that a small amount of oil ________ through leakage, and in order escapes overheats expands accelerates A
expand extract increase decrease C 1279Coalescence is the breakdown of surface tension between oil droplets in an oil / water mixture, which c
1280Which of the following chemicals will be used where protection against caustic cracking is required in Sodium hydroxide Sodium carbonate Sodium nitrate Sodium polyphosphate C 1281The main steering gear must be able to steer the ship at maximum ahead service speed and be capab more than 28 seconds more than 60 seconds less than 28 seconds less than 60 seconds A 1282The auxiliary steering gear must be capable of being brought speedily into operation and be able to put28 seconds / 7 knots28seconds / 14 knots60 seconds / 7knots60 seconds / 14 knots C 1283Special thrust devices are provided on ships to improve their ________ at zero ship speed when the ru
brake capabilities reversing capabilities maneuvering capabilities acceleration capabilities C
at which / to which from which / at which to which / from which in which / on which A 1284The temperature ________ a liquid changes its state from liquid to gas depends upon the liquid itself a
periodically occasionally chronologically additionally C 1285When making entries in the Oil Record Book, the date, operational code and item number shall be inse
1286________ shall be provided to every oil tanker of 150 tons gross tonnage and above to record relevant Oil Record Book Part I Oil Record Book Part II Oil Record Book Part I or Part II Oil Record Book Part I and Part II D
item C / Disposal of oil residues (Sludge)item H / Bunkering of fuel oils C 1287The core item in the Oil Record Book Part Ⅰ is ________, and its main content is ________.item A / Ballast or cleaning or fuel oil tanksitem B / Discharge of dirty ballast or cleaning w
1288According to the international regulations concerning the prevention of pollution of sea areas from ship welcome admitted in some special sea areas prohibited acceptable C 1289If you must enter a room or compartment to combat the fire, keep an escape path ________.open close opens closes A 1290Upon the completion of required tests, a ________ should be placed on each extinguisher, showing th cap disc tag cover C
An economizer An attemperator A water drum A down-comer tube B 1291________, i.e. a steam cooler, may be filled in the boiler system to control the superheated steam temp
instantaneous instantaneously simultaneous simultaneously D 1292Air conditioning is the process of treating air to control ________ its temperature, humidity, cleanliness
1293One of the functions of ventilation is to ________ the humidity of spaces containing sources of moistu increase / reduce reduce / increase increase / increase reduce / reduce D 1294________ is the control of temperature and humidity in a space together with the circulation, filtering a Refrigeration Air conditioning Ventilation Hearing B 1295________ is the circulation and refreshing of the air in a space without necessarily a change of temper Refrigeration Air conditioning Ventilation Heating C
obtain medical help D 1296If liquid refrigerant accidentally comes in contact with the eyes, ________ immediately.rub the eyes irritate the eyes wash the eyes with a heavy boric acid solutio
1297Should a person be overcome due to lack of oxygen and high concentration of refrigerant, treat with __fresh water fresh air salt water artificial respiration D 1298Steering gears can be arranged with hydraulic control equipment known as a ―________‖, or with elect telemeter telemanometer telemotor telemometer C
① only② only both ① and ②neither ① nor ②D 1299Which of the following operations need NOT to be entered on the Oil Record Book part Ⅰ ? ① Routine discharge at sea of bilge water containing oil from the machinery spaces through strainers; ② Bunkering of fuel oil
① only② only both ① and ②neither ① nor ②B 1300Which of the following operations need NOT to be entered on the Oil Record Book part Ⅰ? ① Disposal of oil residues; ② Internal transfer of fuel oil
① only② only both ① and ②neither ① nor ②A 1301Which of the following operations need to be entered on the Oil Record Book part Ⅰ? ① Cleaning of fuel oil tanks; ② Internal transfer of fuel oil
① only② only both ① and ②neither ① nor ②C 1302Which of the following operations need to be entered on the Oil Record Book part Ⅰ? ①Ballast of fuel oil tanks; ② Condition of oil discharge monitoring and control system.
take away the condensate from the air D 1303As the air passes through the charge air cooler, its temperature may be reduced and moisture conden keep the air from being carried into the engin keep the moisture from being condensed keep the danger from being carried into the e
1304With reference to a two ram actuating mechanism, which one of the following statement is false?The rams work inside cylinders.The cylinders have glands sealing their open e The rams are connected to a cross-head.The cross-head is mounted on the rudder st D 1305With reference to an axial piston pump, which one of the following statements is true?The cylindrical barrel is coupled to the motor The cylindrical barrel has an odd number of bo The bores end in sockets.The sockets fit in the swash plate.B 1306With reference to a radial piston pump, which one of the following statements is false?Surrounding the fixed shaft is a hollow shaft.This hollow shaft carries radial bores.Each bore is fitted will a well-lapped plunger.There are always even numbers of bores.D
Only one pump should be used at any time.The ship speed should be reduced to 70% of t Watch keeping of the steering gear should b Limitations of the steering gear should be log
D 1307With reference to operating a four-ram steering gear system under emergency conditions, which one o
B
The auxiliary gear must be of adequate stren All moving parts of the steering gear must be
The auxiliary gear could be power operated in p
1308With reference to rules governing steering gear, which one of the following rules is incorrect?All ships are provided with two independent s
B
The three moving vanes and the three fixed v 1309With reference to a rotary vane steering gear system, which one of the following statements is true?The three moving vanes and the three fixed v
The three moving vanes and the three fixed va The three moving vanes and the three fixed v
1310Large pipes or down-comers are fitted between the steam drum and ________ to ensure good natural fire-tubes furnaces water drums water wall tubes C
purifier separator filter clarifier D 1311When a centrifuge is arranged to separate impurities and small amount of water from oil, it is known as
1312Topping wires fix the height of the derricks and ________ to the deck may be used to prevent fore and stays winches barrels brakes A 1313________ unit is mounted so as to raise and lower the cable from the spurling pipe, which is at the top The cable lifter The hoisting motor The topping wire The life-raft A
The winch motor The band brake The winch barrel The anchor capstan C 1314________ or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to th
1315Excessively warm water leaving condenser may be caused by ________.fouled tubes in shell and tube condenser too little or too warm condenser water air or non-condensable gas in system overcharge of refrigerant B
the piston rod the tiller arm the connecting rod the rudder B 1316Two rams of the hydraulic gear are linked at their outer ends to ________ by a crosshead and swivel b
1317________ connected to the moving tiller will bring the floating lever pivot and the lever into line at right A cut-off lever A swivel block A cross-head A driving gear A 1318________ system is arranged to ensure that water can be drawn from any tank or the sea and dischar The domestic water Bilge water Oil transfer The ballast D 1319Large pipes or ________ are fitted between the steam and water drums to ensure good natural circula fire-tubes furnaces down-comers soot-blowers C
lower than higher than below equal to B 1320The water level in the gauge glass when a boiler is operating is ________ when the boiler is shut down
1321Under rotary pumps are the gear, ________, cam-and-piston and screw types.reciprocating diffuser turbine vane D 1322When the water produced from most evaporator is supplied for drinking purpose, it must be treated to slightly acidic slightly alkaline no salty slightly bitter B 1323________ provides the head or pressure to supply the domestic water where required.The compressed air The compressing air The transfer pump The head tank A 1324________ may be fitted for operating the derrick topping lift (the wire which adjusts the derrick height).A capstan A hold A warp end A mooring drum C 1325The ________ is used for hauling in or letting out the wires or ropes.windlass anchor capstan turning gear winch barrel D 1326Manually operated band brakes may be fitted and ________ will have a brake arranged to fail-safe.the drive pump the drive motor the warp end the purchase B 1327In cargo crane, ________ for lifting the load. a hoisting motor a luffing motor a mooring motor a slewing motor A
the priming pump the transfer pump the hydraulic pump injector pump A 1328The engine fuel oil system should be primed by using ________, and the system cleared of air by mea
1329Domestic water pump is started automatically by ________ which operates as the water level falls to a a level controller a temperature switch a pressure switch a floating ball C
A filter A centrifuge A distiller A generator
B 1330________ is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a
1331The pumps employed on board ship can be divided into two main categories, i.e. ________ pumps an gear non-positive displacement positive displacement rotary C 1332In a complete oil / water separator, more oil will separate out onto the underside of these plates and tra a separator oil water an oil collecting space B 1333Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and ________ or regenerative t reciprocating hydraulic turbine vane C 1334In general,________ is suitable for delivering small quantities at high pressure.reciprocating pump gear pump centrifugal pump vane pump A 1335In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible the outlet of oil the outlet of water the bowl periphery the center of bowl C 1336Bottom blow valves are installed on auxiliary water-tube boilers to ________.remove suspended and precipitated solids fr completely drain the boiler in an emergency sit prevent hardened scale deposits in the water remove floating impurities from the oily water A 1337Oil water separators are used to ensure that ships don't discharge oil when ________ bilge water.to pump off being pumped pumping out it pumping out C
air cooler economizer injector air blower B 1338Additional heat extraction from the exhaust gases can be effected by adding an ________ section to th
1339If a heavy sea strikes the rudder, the shock is transmitted through ________ to the rams, this cause a the control rod the hunting gear the floating ring the tiller arm D 1340The control rod of a steering gear pump is attached at its outer end to ________.the hunting gear the rudder stock the rudder controller the feedback unit A 1341Where tanks are arranged for either oil or ballast ________ must be fitted in the pipeline. a change-over chest a head tank a emergency bilge pump an air cooler A 1342The control spindle operates the slipper ring or ________of the variable delivery pump, which controls servo-motor swash plate plunger cylinder B 1343________ is used for sensing the temperature of the room in the air condition system.An expansion An evaporator A thermostat A condenser C 1344According to the way the steering gear is operated, the steering gear may be divided into: hand-steerin hydraulic steering follow-up steering remote control steering air controlled steering B 1345The various pumps and lines are ________ to some extent so that each pump can act as an alternativ interlocked interconnected interfered interacted B 1346________ are more suitable for large quantities at low pressure.Reciprocating pumps Rotary pumps Centrifugal pumps Gear pumps C
positive displacement non-positive displacement mixed-flow axial-flow A 1347Gear pumps are ________ type because they discharge a near constant amount of liquid regardless o
1348Centrifugal pumps are non-positive and a fairly ________ unit.low pressure low discharge low speed high pressure A 1349In ________ pump a closed discharge valve will not cause excessive pressure to build up.gear vane screw centrifugal D 1350The emergency bilge suction or bilge ________ is used to prevent flooding of the ship.injection valve relief valve discharge valve inlet filter A 1351Centrifugal pumps are popular because they are very simple in construction, and produce smooth, con
non-pulsating pulsating positive non-positive A
Wear Contaminating Coalescence Coarse separating C 1352________ is the breakdown of surface tension between oil droplets in an oil water mixture which cause
1353The removal of ________ from lubricating oil will reduce engine wear and possible break-downs.contaminating water contaminated additives contaminated fuel contaminating impurities D 1354________ is used for washing and drinking.The ballast The salt water system The bilge system The domestic system D 1355The position of the interface between oil and water within the centrifuge is achieved by the use of ____gravity disc centrifugal bowl a stack of discs main sealing ring A 1356If a heavy sea strikes the ________, the shock is transmitted through the tiller to the rams.propeller rudder bow thruster stabilizer B 1357No specific period is given for the renewal of the lubricating oil filter element as this should be done __whatever whenever wherever whoever B
flashing water operating oil flushing water sealing water C 1358To start the ejection process the oil feed to the centrifuge is first shut off and the oil remaining in the bo
as far as as soon as as close as as closer as C 1359The interface between the liquid seal (water) and the oil should be positioned ________ possible to the
1360What is used to purify water and foreign matters from the fuel oil in the following?Compressor Separator Evaporator Fuel pump B 1361They understand the ________ of automatic sludge discharging of the purifier. But they are not good i principle principal theory case A
temperature viscosity density velocity C 1362Here some oil in the oily water separator, as a result of its lower ________ will separate and rise into th
water oil scale ridge B 1363The diameter of the gravity disc is too big. It causes oil to flow through the water outlet. We changed th
1364Sealing in pump shaft is achieved by means of the ________.gasket packing washer spring B 1365Centrifugal pumps, however, can be designed with a number of impellers ________ to attain a large a in series in parallel assembled together B 1366All bilge suction must be fitted with suitable ________, which in the machinery space would be mud bo
strainers valves elements separators A 1367Impurities from the boiler water surface can be removed through the ________.safety valve blow down valve scum valve feed check valve C 1368The exhaust boilers are used to recover some of ________ carried in the exhaust gas from the main e water oil heat steam C 1369The defective place in the furnace should be ________ with fire bricks.paved cleaned welded dismantled A 1370The safety valves are mounted in pairs to ________ the boiler against https://www.doczj.com/doc/1e17804075.html,e release protect effect C 1371The safety valve should be ________ in the presence of C / E and Surveyor.tightened up sealed up opened up unscrewed B 1372Between the steam drum and the smaller water drum below, large numbers of smaller diameter _____fire water wall generating down comer C
monkey donkey waste heat main B 1373 A ________ boiler is an auxiliary boiler sometimes included in a steamship's installation for supplying s
the more the higher the lower the highest B 1374Water evaporates or steam condenses at the saturation temperature, which depends upon the pressur
1375The soot blowers are operating in the oil fuel boiler the air / fuel ratio must ________ throughout the ac be increased be decreased remain constant either be increased or remain constant A 1376At normal sea going, we use ________ instead of donkey boiler. a heater a pre-heater an exhaust gas boiler the coal burning boiler C 1377The internal part of boiler should be cleaned by yard if found ________.scaled worn deformed rusted A 1378The oil ________ in the discharging water from oil water separator exceeds 15 PPM without alarm, be filter hole pollution content D 1379The remaining oil / water mixture now flows down into the fine separating compartment and moves slow
catch plates swash plates cover plates bedplates A 1380Grease the roller bearings with H.P. gun. In the sentence ―H.P.‖ means ________.horse power high pressure compressor hand pump high pressure D 1381Anchor ________ are used in some installations where the cable lifter rotates about a vertical axis.windlasses drums capstans warp ends C
neutral end opening closure A 1382Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control v
1383Anchor capstans are used in some installation where the cable lifter rotates about a ________.horizontal axis crankshaft vertical axis camshaft C 1384If a heavy sea strikes the rudder, the shock is transmitted through the tiller to ________.the tiller arms the swivel blocks hunting gears the rams D 1385The hand steering is a method by which the motion of the rudder is controlled with ________. a motor-driven steering wheel a pneumatic steering wheel a hand-driven steering wheel an electric steering wheel C 1386These include deck machinery such as mooring equipment, anchor handling equipment, cranes and _boilers bow thrusters stabilizers hatch covers D 1387 A warp end may be fitted for operating the derrick topping wire which adjusts the derrick ________.length slack height rotation direction C 1388In a general cargo crane, three principal movements are ________; ________; ________.hoisting / luffing / slewing lifting / raising / lowering rotating / raising / handling hosting / lowering / moving A 1389For occasional heavy loads, two cranes can be arranged to work together. The operating ________ for principle medium instruction voltage B 1390In the cargo winch, spur reduction gearing transfers the motor drive to ________.the toping light the board brake the fail-safe the barrel shaft D 1391The inner part of the condenser should be cleaned with ________.gas oil diesel oil chemical compound Freon-12C 1392The shutter of the evaporator was blocked with ________, it means there was too much evaporation.i ce wooden board iron plate cotton waste A
balance not balance be more than be less than A 1393The quantity of cooled air delivered by an air conditioning unit should ________ the sum of the quantity
liquid gas solid water only B 1394Freon 12 which is used to produce intense cold is normally a ________ when at atmospheric pressure
liquid oily mixture emulsion vapor D 1395As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant tu
1396Because the expansion valve is just ________ way open, the refrigerant is under low pressure in the e little few a little a few C 1397The refrigerating agent can ________ at low temperature in the evaporator.expand evaporate condense distill B 1398Faulty operation of any system is indicated by very definite ________.symptoms samples traces tracks A 1399The boiling and condensation points of a refrigerant depend on the ________ exerted up on it.temperature pressure velocity heat B 1400In the condenser, the hot, high pressure refrigerant gas is cooled by the sea water and becomes ____fresh water vapor mixture liquid D 1401We use ________ to distill fresh water from sea water.engine sea water pump cylinder cooler fresh water generator D 1402Because of the reduced ________ in the vacuum boiling evaporator, some of the sea water boils as it temperature water level pressure rate of flow C 1403The fresh water generator produces fresh water ________by cooling sea water.by heating sea water by evaporation of sea water by purifying sea water C 1404Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl ________.bottom top center periphery D 1405The designed capacity is 25 tons a day, but the fresh water generator can only ________ 22 tons at pr consume distill run operate B 1406In the process of ________, liquid changes into gas.evaporation frosting condensing compressing A 1407More than one stage of evaporation can take place by admitting the sea water into chambers with prog lower higher the lower the higher A 1408You must take good care of the drainage cock of the air control system. because ________ leads scal the temperature the rust the pressure the humidity D 1409Keep compartment ________ as the gas given off can be dangerous.well ventilated well clean in good order more room A 1410Gear pumps are ________ because they discharge a near constant amount of liquid regardless of pre negative displacement type turbine type positive displacement type mixed-flow type C 1411The boiler is fired ________ the demand for steam exceeds that available from exhaust gas heating.whenever however wherever whether A 1412An oil water monitor is required in order to measure ________.the oil content in water the water content in fuel oil the water level in bilge well the oil level in bilge well A
as well as as long as rather than other than D 1413Oil Record Book Part Ⅰ.shall be provided to every oil tanker of 150 tons gross tonnage and above and every ship of 400 tons gross tonnage and above, ________ oil tankers, to record relevant machinery space operations.
more than other than in addition to except for B 1414The bilge main is arranged to drain any watertight compartment ________ ballast, oil or water tanks an
1415If oil density were greater than water's, the oil separator ________.did work would work well didn't work wouldn't work D 1416Oil water separators are used to ensure that ships don't discharge oil when pumping out ________.ballast water boiler water bilge water sewage water C 1417 A hydraulic machine is one that uses ________ to do work.liquid steam gas electricity A 1418In a vacuum distillation system, the case is the higher the pressure ________.the saturation temperature is higher the higher the saturation temperature the higher is the saturation temperature the saturation temperature is more high B 1419Because of the reduced ________ in the distillation system, some of the sea water boils as it flows thr pressure temperature density volume A
few little a little less A 1420In extreme weather conditions, either hot or cold, control of the air conditioning plant presents _______
catch plates dampers regulating valves fans B 1421Most air conditioning units have ________ for adjusting the ratio of recirculated fresh air. Care must be
1422For the intermediate condition, thermostats must be correctly set ________.by trial and error by and large automatically very easily A 1423The cooler as the liquid becomes, ________.the faster it will evaporate the slower it will condense the slower it will evaporate the faster it will flow C
overboard a bilge well a slop tank a hot well C 1424Where an excessive level of contamination is detected an alarm is sounded and diverting valves are op
1425When a boiler is operating, the water level in the gauge glass reads ________ when the boiler is shut lower than higher than as much as the same as B
in order that so as to so that in addition to B 1426Strainers and fine filters should be cleaned at intervals, ________ prevent dirt from getting under a fue
1427The fine filters will be arranged ________ one can be cleaned while the other is operating.in order to because of so that so as to C
a flash generator a flash evaporator a vacuum boiling evaporator a boiler C 1428In ________, hot diesel engine jacket jacket water passes over the stack and heats the sea water pass
1429In an oil cooler circulated by sea water, the oil is at a larger pressure the result being that any leak in th oil sea water refrigerant fresh water A 1430Sediment collects in a tubular purifier ________.on top cover on sides of bowl in drain line on the discs on the discs B 1431The ________ discharge a nearly constant amount of liquid regardless of pressure.mixed-flow pump axial-flow pump centrifugal pump displacement pump D 1432The gear, screw, and vane pumps are all classified as ________.variable stroke pumps multistage pumps positive displacement pumps triple-ported pumps C
①, ② and ③①, ② and ④②, ③ and ④None of the above.B 1433Which of the following are components of a mechanical seal? ① stationary ring; ② rotational ring; ③ packing; ④ spring.
1434The pressure head of a water pump is given in the unit of ________.kg MPa mH2O None of the above.C 1435 A vane pump belongs to ________ according to its working principle.reciprocating pumps positive displacement pumps centrifugal pumps centripetal pumps B 1436Attempts are made to eliminate axial thrust in centrifugal pump by ________.providing the impeller with counterbalancing the use of symmetrical impeller neither A nor B A and B D 1437Generating tubes in waste heat boilers are finned to ________.reduce gas flow turbulence prevent exhaust gas corrosion increase the rate of combustion increase the rate of heat transfer D 1438The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of seawater contamination frequent surface blows dissolved oxygen deaeration frequent bottom blows A 1439Air chambers are usually fitted to reciprocating pumps in order to ________.increase discharge pressure increase suction vacuum develop pulsation flow keep a steady rate of flow D
1440The water in an auxiliary boiler should be tested for chloride content to determine ________.total dissolved solids salt contamination water hardness chlorine contamination B 1441 A positive displacement pump is that where the volume of the pump chamber is alternately ________ increased / decreased decreased / increased decreased / decreased increased / increased A
① only① and ②①, ② and ③② and ③B 1442Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? ①reciprocating; ② rotary; ③ centrifugal.
① only① and ②①, ② and ③② and ③C 1443Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? ① reciprocating; ② vane; ③ gear.
1444 A pump is said to have ―negative suction‖ when the pump is located ________.between the suction and discharge below the liquid supply above the liquid supply any of the above C 1445If a bilge pump failed to build up discharge pressure, you should check for ________.excessive water in the bilges a clogged suction strainer oil in the bilges a closed skin valve B
all of the above are true D 1446The advantage of a centrifugal pump as compared with a reciprocating pump is that ________.discharge is continuous it has no internal valves upon accidental closing of discharge valve, e
1447Which of the following pumps belongs to centrifugal pump?Reciprocating pump.Screw pump.Diffuser pump.Water-ring pump.C 1448While flowing through the volute in a centrifugal, part of the ________ energy of the liquid is converted kinetic / pressure kinetic / essential pressure / kinetic pressure / height A 1449When there is a flame failure in an automatically fired auxiliary boiler, the ________.air supply is shut off fuel supply is shut off water supply is shut of safety valve lifts B 1450Fins are installed on the generating tube surfaces in waste heat boilers to ________.prevent soot fires in the exhaust system prevent exhaust gas erosion of the tubes increase the velocity of exhaust gas flow increase the rate of heat transfer D 1451Excessive vibration of an automatically fired auxiliary boiler can be caused by ________.air or water in the furnace combustion pulses fuel oil pump failure flame failure B
high steam pressure in the boiler abnormally high feed water temperature abnormally high boiler water temperature steam demand exceeding feed pump capaci B 1452If the feed pump for an auxiliary boiler fails to deliver feed water to the boiler, the cause may be ______
1453Black smoke coming from a boiler can be caused by ________low water level low oil pressure excessively high fuel pressure an improper air / fuel ratio D 1454Proper combustion in a boiler would be indicated by ________.yellowish flame golden yellow flame white flame brilliant white flame B 1455The feed water to the boiler will comprise ________.condensate a small amount of make-up feed A and B None of the above C 1456The furnace of a oil-fired boiler should be ________ before the operating burner is lit.filled with water purged cleared of air none of the above B 1457Too much air in the furnace of an oil-fired boiler would be indicated by ________.yellowish flame golden yellow flame white flame brilliant white flame D 1458 A donkey boiler is ________.one to supply steam to the main propulsion tu
an auxiliary boiler A and B neither A nor B B 1459 A feed pump for an auxiliary boiler might lose suction if the ________.boiler water level is low feed water is too hot boiler steam demand is low feed water is too cold B 1460The water level in a steaming boiler will always ________.vary as the steam demand changes remain constant as long as the feed pump ope fall when the steam pressure is decreasedrise when the steam pressure is increasedA 1461Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?Increased suction head pressure Decreased feedwater temperature Pump recirculating line being open too much Excessive feedwater temperature D
①① and ②②neither① nor ②A 1462If at a normal steaming condition and water goes out of sight in gauge glasses the action you should ta① secure oil to fires; ② increase feed pump pressure.
1463Foaming in the steam drum may be caused by ________ in a boiler.oxygen in the water poor boiler design density too high excessive steam demand D 1464The water in an auxiliary boiler should be tested daily for ________.dissolved oxygen chlorides sludge dissolved nitrogen B
water-tube fire-tube exhaust gas None of the above.B 1465In a ________ boiler the hot gases from the furnace pass through the tubes while the water is on the o
1466________ should be tested and adjusted when the boiler survey is carried out.The boiler oil tank The steam pipe The fire side The safety valves D
The safety valve escape piping should be dis The boiler vent valves should be opened.All hand-hole / manhole covers should be tig All of the above.B 1467In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedure
1468 A dazzling white burner flame in the boiler furnace indicates ________.proper combustion water in the fuel excess air cold fuel oil C
salinity is abnormally high steam demand is too high water level is abnormally low feedwater flow is low C 1469The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler ____
1470The correct pH value of boiler water is achieved by continuous addition of a suitable ________ to the f acid alkali salt None of the above.B 1471Black smoke coming from a boiler can be caused by ________.low water level high water level excessively high fuel pressure low oil temperature D 1472________ will be used to blow away soot and the combustion products from the tube surfaces.The blow down valve The scum valve The air release cock Soot-blower D
furnace to be re-purged electric charge to buildup in the igniter fuel pump to restart drum level to stabilize A 1473After a normal, or safety shutdown, automatic combustion control systems for an auxiliary boiler are de
1474Improper maintenance of an automatic auxiliary boiler oil burner could result in ________.fuel pump failure fan motor failure increased feed-water consumption decreased boiler efficiency D 1475If the fire goes out in an automatically fired auxiliary boiler and the burner continues to supply fuel, ther overpressure and dry firing a severe furnace explosion spalling damage to the brickwork heat damage to the atomizer B
A 1476Prior to lighting off a cold automatically fired auxiliary boiler, you should ________.check and regulate the water level close the air cock once fires are lit blowdown the gage glass crack the steam stop to assure protective ste 1477Which of the following items is necessary for all waste heat boiler installations, regardless of design or Control of evaporation. A separate means to prevent feed-water conta Power circulating pump.Super-heater.A 1478For proper operation, auxiliary boiler feed water must have which of the following characteristics?High oxygen concentration.Low pH.Proper alkalinity.All of the above.C 1479When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust ga at high loads to prevent overheating at low loads to prevent corrosion in the boilerduring periods of high steam demand when the turbocharger is in operation B
① only② only① and ②①, ② and ③C 1480When a hydraulic vane pump is working , which of the following is in contact with the vanes? ① the rotor; ② the internal surface of the housing; ③ the external surface of the housing.
1481Thermostatic expansion valve are ________.either all the way open or all the way closed normally open throttled depending on load controlled by suction pressure C
① only any of ①, ② and ③either ① or ③either ① or ②C 1482Which of the following may cause that excessively warm water leaves the condenser in a refrigeration ① too little cooling water; ② too much cooling water; ③ too warm cooling water.
1483If a refrigeration compressor is running continuously without lowering temperature as normal in the refr excessive condenser cooling water warm food in the refrigerator a shortage of refrigerant s shortage of compressor oil C 1484The color of the flame on a halide torch without any refrigerant present is ________.blue green orange purple A 1485The compressor suction line conveys the refrigerant vapor from ________.condenser to evaporator evaporator to compressor compressor to condenser None of the above.B 1486If an anchor windlass has been idle for some time, you should ________.repack all valve stems lubricate it prior to use replace the foundation bolts balance the warping heads B
gums, acids, and varnishes removed by cellulose type filters neutralized by oil additives not removed by absorbent filters A 1487Water allowed to accumulate in the hydraulic system oil will cause an oxidation process producing by-p
1488It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong di head capacity to improve discharge to be reversed efficiency to decrease slippage to decrease C 1489 A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to low evaporator pressure decrease evaporator coil over-feed evaporator capacity increase expansion valve diaphragm rupture B 1490Air compressor receivers should be ―blown down‖ at least ________.yearly quarterly monthly daily D
hydraulic fluid contamination excessive fluid friction turbulent fluid flow fluid pressure surges A 1491Hydraulic machinery failures are commonly caused by misalignment of the system components and by
1492 A double suction centrifugal pump impeller has been installed in the reverse direction, and will ______have a greater head capacity operate with increased impeller efficiency discharge through the suction side of the pu require more power to turn the shaft D 1493If a centrifugal pump were continually operated with the discharge valve closed, the ________.motor controller overload would open pump would eventually overheat relief valve would continuously cycle open motor would overheat B
C 1494When you adjust a thermostatic expansion valve, ________.refrigerant must be bled off the sensing line b
all refrigerant must be pumped into the receive time must be allowed for conditions to stabili all refrigerant must be routed through the deh 1495Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and ______fluid friction fluid turbulence component misalignment pressure surges C 1496The refrigeration system low pressure cutout switch is actuated by ________.an electric system manager a sensing bulb at the tail coil of the evaporator pressure changes in the suction line failure of the ding solenoid valve C 1497 A knocking sound emitted from an unloaded air compressor is probably caused by ________.damaged intake valves excessively tight mounting bolts insufficient cylinder lubrication a loose piston D
Mesh separators are used in evaporators to Reducing the brine density will reduce the he
A
Increasing the absolute pressure of the shell w
1498Which of the following statements is true concerning any evaporator?High conductivity of the distillate indicates dis
1499The sensing line for the low pressure cutout switch to a refrigeration system is located ________.in the chill box before the receiver on the suction side of the compressor on the discharge side of the compressor C
evaporation distillation dehydration condensation D 1500In the production of freshwater from seawater through a process of heating and cooling, the cooling ph
1501The process of boiling seawater in order to separate it into freshwater vapor and brine is usually define dehydration condensation evaporation dissolution C
start and stop the compressor at preset oper operate at minimum efficiency C 1502The purpose of the low pressure cut-out switch is to ________.maintain liquid refrigerant at the suction of th maintain a preset suction pressure to the comp
1503Overheating of a hydraulic system may be a result of ________.changing pump discharge pressure in respo a high oil level incorrect fluid viscosity continued slow re-circulation of the oil C 1504Condensate must be drained periodically from the air compressor receivers to prevent ________.second stage cylinder lockup oil sump contamination faulty operation of pneumatic valves corrosion of air receiver baffles C 1505When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be completely filled with saltwater filled with de-scaling compound tightly closed to exclude air vented to the atmosphere D 1506Short cycling of a refrigeration compressor refers to ________.frequently grounding out frequently starting and stopping running too fast running too slow B 1507The emergency bilge suction valve is typically used ________.to inject cleaning additives when the bilges a when the main condenser becomes fouled, in to connect the rose box to the independent b if the bilges become flooded and they can no D 1508On all vessels equipped with refrigeration units of over 20 cubic foot capacity, ________ a gas mask suitable for protection against ea it is the sole responsibility of the chief engineer spare charges shall be carried for at least 50all of the above A 1509Which of the listed types steam traps operates on the principle that hot water flashes to steam when it Ball float Thermostatic Bimetallic Impulse D 1510The heat gained per pound of refrigerant in the evaporator is known as the ________.latent heat of vaporization sensible heat refrigerating effect specific heat of vaporization C 1511The process of removing moisture from air is known as ________.humidification dehumidification vaporization evaporation B
B 1512 A centrifugal bilge pump requires priming ________primarily to lubricate the shaft seals due to the inability of this type of pump to lift w to initially unload the pump by having head p in order to overcome the potential energy of w
Rough casing volute surfaces Worn wearing rings Heavy fluid in the flow stream A 1513Which of the listed conditions can lead to cavitation in a centrifugal pump?Vapor pockets formed in the suction flow stre
1514Which of the following descriptions best identifies the operating principal of a flash-type evaporator?Sea water is heated to boiling temperature w S ea water is passed over heated plates in a thi Heated sea water is injected into a vacuum c Sea water is forced through a heated educto C 1515If air at 95℃ dry bulb temperature and 50% relative humidity is conditioned to 75℃ dry bulb temperature and 50% relative humidity, it is an example of ________.
cooling only cooling and humidifying cooling and dehumidifying adiabatic cooling C 1516What is a function of the wearing rings used in most centrifugal pumps?Absorb erosion of high velocity discharge str Seal pump shaft against entry of air.Isolate the discharge side from the suction s Dampen the turbulent discharge flow.C 1517When liquid reaches the compressor of a refrigeration system through the suction line, the condition is flooding back superheating overflowing recycling A 1518The term "pour point" is defined as the lowest temperature at which lubricating oils will flow ________.rapidly by gravity through a standard orifice at a specified temp
at a rate of 60cc per second B 1519 A reciprocating air compressor is running roughly and vibrating excessively, indicating that the ______compressor is overloaded motor is overloaded foundation bolts are loose belts are too tight C
1520Increasing the moisture content of conditioned air is known as ________.moisturizing dehumidification dampening humidification D 1521In a radial piston pump, reversed and control of fluid flow are accomplished by moving the ________.central radial plunger floating ring cylinder body C 1522To maintain design discharge pressure from a centrifugal pump, the design clearance must be mainta shaft and impeller motor and pump shaft casing and impeller wearing rings lantern ring and impeller C 1523If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be ________.contaminated fluid pitted thrust rings worn pintle bearing obstructed suctions passage D
Single stage or multistage.High pressure or low pressure.Open or close coupled.Horizontal or vertical.A 1524With respect to centrifugal pump impellers, which of the following descriptions represents the correct c
1525The sum of the sensible heat and the latent heat of any substance is known as ________.total heat residual heat specific heat superheat A 1526The static suction lift of a pump is the difference in elevation between the ________.centerline of the pump and the level of the liq centerline of the pump and the suction liquid le centerline of the pump and the level of the di liquid level of the suction and discharge A 1527The heat identified by only a change in temperature is known as ________.sensible heat latent heat total heat residual heat A 1528The usual number of single-acting piston used in a variable stroke axial-piston pump is ________. 3 or 5 5 or 77 or 99 or 11C
at an angle to each other and to the shaft B
radially from the shaft parallel to each other and to the shaft parallel to each other but at a right angle to th
1529An axial piston pump differs from a radial piston pump as the piston of an axial piston pump are positio
1530In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a spec superheated saturated condensed convected B 1531Why are removable sleeves installed on centrifugal pump shafts?They make it easier to replace the pump sha They can be economically replaced as they we They can be removed when it is necessary to
They increase the strength of the shaft.B
misalignment or worn main bearings insufficient cylinder lubrication defective of poorly fitted valves All of the above A 1532If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause
B
Rotary pumps occupy only one-half the spac Rotary pumps eliminate discharge slippage o
The high discharge pressure of the rotary pu Rotary pumps are capable of pumping more flu
1533Which of the following statements represents the advantage of rotary pumps as compared to reciproca
1534Which of the following factors will have the greatest effect on the heating load within a conditioned spa Solar gain.Infiltration and ventilation air.Occupants inside the space.Entertainment equipment within the space.B 1535Which of the following terms represents the form of heat removed from the refrigerant in the condense Latent heat of vaporization.Heat of compression.Superheat.All of the above.D 1536Which of the listed problems could produce a high absolute pressure within a flash type evaporator?Production high salinity distillate.Seawater feed temperature below 165℃. A leak in the first stage demister. A cracked distillate pump vent line.D 1537The dew point of air is reached when the wet bulb temperature is ________.twice the dry bulb temperature10℃ above the dry bulb temperature5℃ above the dry bulb temperature equal to the dry bulb temperature D 1538Increasing the speed of a rotary pump above its rated speed will result in which of the following conditi L0ss of suction Increased clearances Decreased clearances Decreased slippage B 1539The tendency for lubricating oil to thin out at high temperatures and thicken at low temperatures will be low viscosity index high viscosity index high neutralization number low demulsibility quality A 1540The temperature at which water vapor in the atmosphere begins to condense is called the ________.d ew point temperature condensation temperature psychometric temperature absolute humidity temperature A 1541One of the main differences between the various types of screw pumps is in the ________.stuffing box diameter direction of rotation of the screws pitch of the screws type of driving gears C 1542The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs, is to __secure and tag the electrical circuit place a crow bar in the flywheel of the unit inform all persons in the area not to start the make a log book entry A 1543In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the ________.compressor condenser receiver evaporator D
passing the gaseous refrigerant through the maintaining a high pressure on the system's B 1544The only means of removing the heat of condensation from a refrigerant in the normal refrigeration cyc passing it through the expansion valve condensing refrigerant in the system condense
1545With reference to a vessel's structural integrity, the most significant characteristic of a cryogenic liquid capability of causing brittle fractures highly corrosive action on mild steel vapor cloud which reacts violently with saltwa
toxicity at atmospheric pressure A
fusion vaporization condensation sublimation A 1546The heat required to change a substance from a solid to a liquid while at its freezing temperature, is kn
1547The degree to which the viscosity of an oil will change with a change in temperature is indicated by the weight designation viscosity index pour point thermal change value B
Overcoming sliding friction.Overcoming rolling friction.Overcoming fluid friction.Overcoming wedge friction.A 1548Which of the processes listed consumes the greatest amount of power while producing the greatest am
fusion vaporization sublimation condensation B 1549The heat required to change a substance from a liquid to a gas without experiencing a temperature cha
C 1550 A distinguishing feature of an eductor, when compared to other pumps, is the ________.discharge end being smaller than the suction small size of impeller lack of moving parts ease at which the wearing rings may be chan 1551When securing a flash-type evaporator for an extended period of time, you should ________.fill the unit with saltwater fill the unit with de-scaling compound completely drain the unit tightly seal the unit to exclude air C
Close radial clearance between impeller hub Low rotational speed of impeller.Removable end plate.Replaceable impeller and casing wearing rin D 1552Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?
1553Centrifugal pump may fail to deliver water when first started if the ________.water seal pipe is plugged pump is not primed seal ring is improperly located impeller is flooded B 1554Which of the devices listed is common to all types of pumps? A power end and fluid end. A propeller and educator. A volute and impeller. A turbine and piston.A 1555If a centrifugal pump vibrates and is noisy when operating, the cause could be ________.worn gland sealing shaft worn wearing rings a bent shaft reversed pump coupling C
through a solenoid operated three-way valve D 1556Distilled water from an evaporator may be discharged into a potable water tank ________.through a detachable hose connection after passing through an activated charcoal filt after chemical analysis it is fit for consumptio
1557If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace
packing gland mechanical seals lantern rings wearing rings D
lantern rings bearings casing volutes wearing rings D 1558To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is us
1559Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear face shield a respirator rubber gloves an all purpose gas mask A 1560The purpose of an air compressor unloading device is to ________.drain water from the air receiver drain water from the cylinders delay the compression process until the mot check pump alignment C 1561The amount of moisture in a given sample of air, when compared with the amount of moisture the air c absolute humidity specific humidity effective humidity relative humidity D
A
Distillate is the product resulting from the eva
Brine is the result of condensed sea water va
1562Which of the following statements is correct relative to distillation plant operation?Distillation is the process of boiling seawater Evaporation is the second part of the distillation
1563If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure l excessive pump speed excessive suction head worn wearing rings gross pump misalignment C 1564The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the absolute humidity relative humidity specific humidity total humidity B 1565Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?Hydrochloric acid Chlorine Sulfuric acid Zinc chromate B 1566The steam coils in a high pressure evaporator used for saltwater service should be de-scaled with ___a needle gun soap and water a wire brush a chipping hammer C 1567The packing installed in the pump stuffing box is lubricated by ________.gravity and feed oil cups grease cups hand during installation leakage through the stuffing box D 1568If you were operating a centrifugal water service pump with worn wearing rings, the ________.pump would be very noisy pump would vibrate excessively pump would develop insufficient flow stuffing box would leak excessively C
Very little change in viscosity occurs with a s The viscosity of the oil increases with an incr C
No change in viscosity occurs with a minor cha
1569Which of the following statements is correct regarding an oil with a high viscosity index? A large change of viscosity occurs with a min
1570Brine density in a distilling plant is measured with a / an ________.psychrometer salinometer anemometer sphygmomanometer B 1571One of the main functions of wearing rings, as used in a centrifugal pumps, is to ________.maintain radial alignment between the pump absorb all impeller shaft end thrust prevent water leakage to the atmosphere prevent wear of the pump casing and / or imp
D
100℃125℃150℃175℃B 1572For safe storage, the maximum allowable temperature to which refrigerant bottles should be exposed is
All system pressure should be readjusted.The system should be drained and renewed B 1573After installing a new hydraulic pump in a system, what special attention should be given to the hydrau The relief valves in the system should be rea The filters and strainers should be checked fre
1574An un-loader is installed on an air compressor to ________.bypass the high pressure stage to the low pr prevent excessive inter-stage pressure buildup control compressor discharge pressure remove all but the frictional during starting D 1575Which of the following is operated from the main engine room console on an automated vessel?Fire pump and lube oil pump Lube oil pump and distilling plant Distilling plant and shaft alley door Shaft alley door and fixed CO2 release A
toxic flammable explosive all of the above D 1576Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however ________
1577Which of the following terms is used to identify the pressure of the liquid entering a pump?Suction head Pump head Discharge head Total head A 1578When subjected to high heat from a open flame, or an electric heating element, which of the listed refr CO2Methyl chloride R-22Sulphur dioxide C 1579Demulsibility of a lube oil is defined as ________.the ability of oil to separate from water the temperature at which oil flows rapidly a measure of the water in a lube oil system an emulsion of different grades of oil A
bottom of the piston and bottom side of the h top of the piston and bottom side of the head B 1580The clearance volume for a single stage compressor is defined as the space created between the ___top of the piston and bottom side of head, wit piston and head, including the space around th
1581If the discharge valve is closed before the drive motor is stopped, which of the following types of pump Centrifugal Gear Propeller Turbine B 1582When the relief valve opens it discharges high pressure refrigerant vapor to the ________.liquid strainer refrigerant inlet of the condenser inlet side of the evaporator suction side of the compressor D 1583The ability of an oil to separate cleanly from an oil and water mixture is referred to as its ________.precipitation number neutralization number pour point demulsibility D
The volumetric efficiency is decreased in mu C 1584Which of the following statements is true concerning the overall efficiency of air compressors?High pressure compressors are more efficien
Mechanical efficiency divided by compressor e Two stage compressors are generally more e
C 1585To obtain maximum efficiency, two stage air compressors are usually ________.horizontally mounted never fitted with intake filters fitted with intercoolers operated in an unloaded condition at all times 1586The function of the hydraulic telemotor transmitter used in an electro-hydraulic steering gear system is transmit the rudder angle to the bridge indica prevent the control linkage from striking the sto
automatically purge all entrained air from the send hydraulic signals to the receiving unitD
A radial piston pump houses sliding pistons in The amount of fluid displaced per revolution All of the above.A 1587Which of the following statements is / are true regarding hydraulic pumps in general?Variable volumes can be obtained with gear p
1588R-12 is generally considered to be a safe, nontoxic, nonflammable, and non-explosive refrigerant. It ca superheated outside the system in contact with an open flame heated to the boiling point All of the above.B 1589 A refrigeration system contaminated with moisture can be affected by ________.acid formation sludge formation ice in the expansion valve All of the above D
charged into a system having copper fittingsallowed to mix compressor oil exposed to an open flame or hot surface D 1590Some chlorinated fluorocarbon refrigerants may decompose into a toxic irritating gas if it is ________.stored at temperatures below 60 degrees Fah
Viscosity and specific gravity are directly pro Viscosity and specific gravity are not related D 1591Which of the following statements describes the relationship between viscosity and specific gravity?Liquids with different viscosities will always h Liquids with different viscosities will never have
1592The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of slide block tilting box pintle reaction ring B 1593The pressure of a liquid leaving the pump can be referred to as the ________.total head discharge head net positive suction head suction head B
B 1594Tube leaks in the distillate cooler of a two stage flash evaporator will result in ________.loss of second stage vacuum contamination of the distillate lower feed inlet temperature contamination of the second stage condense 1595Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by _______a compressed packing gland lantern rings between the packing rings a liquid seal the stuffing box gland
C 1596The suction-force principle of operation is a typical characteristic of ________.centrifugal pumps jet pumps propeller pumps reciprocating pumps
D 1597Hydraulic pumps most commonly used in steering systems are of the ________.lobe type screw type axial piston type volute type C 1598An additive used to improve the ability of a lube oil to reduce friction is known as a / an ________.suppressant additive dispersant additive extreme pressure additive viscosity improver additive C
D 1599In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on s When the helm is at any angle other than am When the six-way valve is opened.When the ram relief valves lift.When the rudder angle is different from the p