The term refers to one complete sequence of operations required to produce power in an engine.
A. diesel engine
B. stroke
C. cycle
D. compression ratio
62. The is the power available at the output shaft of the engine and can be measured using a
torsionmeter or with a brake.
A. electric power
B. shaft power
C. indicated power
D. mechanical power
63. VIT means .
A. variable injection timing
B. variable inlet tonnage
C. vertical incoming tonnage
D. vertical incoming tank
64. Supposed the rated capacity of the main engine of a ship is 10000kw at 100 rated r/min, then
when at 80r/min its capacity should be .
A. 800kw
B. 5120kw
C. 6400kw
D. 4180kw
65. Engine displacement is equal to the cylinder .
A. area times the stroke
B. area times the stroke, times the number of cylinders
C. volume times the stroke
D. volume times the stroke, times the number of cylinders
66. In describing engine operation, what does the term“cycle”mean?
A. The sequence of events that produce a power pulse.
B. One rotation of the engine crankshaft
C. One stroke of a piston
D. All of the above
67. The time between injection and ignition of the fuel is known as .
A. turbulence
B. after burning ratio
C. pre-ignition lag
D. ignition delay
68. The compression ratio of the diesel engine refers to the ratio between the .
A. piston area to connecting rod length
B. cylinder volumes at bottom dead center and at top dead center
C. engine cylinder size to piston size
D. the number of compression strokes for a given horsepower
69. The most important factor in engine performance is the actual power output at the end of the
crankshaft available of doing work. This is known as_____.
A. indicated horsepower
B. brake horsepower
C. net horsepower
D. friction horsepower
70. The injection on a shaft designed to change circular motion into up and down or back and fore
motion is called .
A. wheel
B. crankshaft
C. running gear
D. cam
71. A clearly visible benefit of RT-flex engine is their _____ operation at all ship speeds. This is
achieved by the superior combustion performance.
A. shock less
B. smokeless D. no vibration D. noiseless
72. A main bearing consists of two shells which are secured by means of studs and _____.
A. tie rods
B. through bolts
C. lead wires
D. bearing caps
73. Compared to four-stroke/cycle engines, two-stroke/cycle engines have the disadvantage of
_____.
A. less even torque
B. higher cylinder head temperatures
C. fewer power strokes per revolution
D. greater weight/size requirements
74. The greatest turbulence in a diesel engine cylinder is created by the_____.
A. shape of the combustion chamber
B. fuel injection spray pattern
C. cylinder swept volume
D. degree of penetration of the fuel oil droplets
75. In order to control thermal stresses, some types of modern engines use pistons with_____.
A. heavy wall and intensive cooling
B. heavy wall and no cooling
C. thin wall and no cooling
D. thin wall and intensive cooling
76. A piston in a four-stroke/cycle diesel engine makes four strokes during each_____.
A. crankshaft revolution
B. mechanical cycle of operation
C. period of two combustion cycles
D. cycle of two events
77. Crankshafts of medium speed engines are _____ from a single piece of steel.
A. unusually solid welded
B. never be solid forged
C. almost invariable solid forged
D. almost invariable be welded
78. In a two-stroke engine the crankshaft rotates at _____ the engine rotational speed.
A. half
B. twice
C. the same speed as
D. four times
79. A diesel engine is similar to a gasoline engine except that the former has no_____.
A. cross-head
B. cylinder
C. connecting rod
D. spark plug
80. However fast or slow the combustion rate, it is still a _____between carbon, hydrogen, sulphur
and oxygen that release heat.
A. physical deformation
B. state exchange
C. chemical reaction
D. coalescence
81. _____of different thickness are inserted between the shells to enable adjustment of the bearing
clearances.
A. Screws
B. Films
C. Discs
D. Shims
82. The gas loads on the engine structure are constrained by means of hydraulically preloaded
_____which connect the bedplate, frame sections and cylinder jackets into a single unit.
A. connecting rods
B. main bearing
C. column
D. tie rods
83. Which of the flowing statements represents the function of the compression rings installed at
the top of a diesel engine piston?
A. Control the amount of lube oil burned in the combustion chamber
B. Transmit heat from piston to the cylinder liner
C. Prevent damage to ring groove inserted by acting as a heat dam
D. Dissipate combustion chamber pressure by channeling it through the ring gap
84. In a diesel engine, _____offers the heat energy directly; _____works as working medium and
changes the heat energy to mechanical energy.
A. the burning of the fuel, medium shaft
B. fuel spray, fresh air
C. fuel, fuel spray
D. the burning of the fuel, the burned gas mixture
85. In a diesel engine, _____works as working medium and changes the heat energy into
mechanical energy, _____changes the reciprocating movement to rotary movement.
A. fuel spray, the burning of the fuel
B. the burned gas mixture, connecting rod
C. medium shaft, crankshaft
D. the burned gas mixture, piston rod
86. One of the differences between a two-stroke engine and a four-stroke engine is_____.
A. a two-stroke engine works without exhaust operation
B. a two-stroke engine works without compression stroke
C. a two-stroke engine works without expansion stroke
D. a two-stroke engine works without suction stroke
87. One of the differences between a two-stroke engine and a four-stroke engine is_____.
A. a two-stroke engine can’t work without cylinders
B. a two-stroke engine can’t work without pistons
C. a two-stroke engine can’t work without crankshafts
D. a two-stroke engine can’t work without a blower
88. In a diesel engine, when the fuel is injected into the cylinder, _____.
A. the piston is just coming upward from the bottom dead center
B. the piston has moved about one-fifth of the way up
C. the piston has moved most of the way up and almost reached the TDC
D. the piston has just past the TDC
89. _____is the main reason that reduces the power advantage of a two-stroke engine over a same
size four-stroke one to about_____.
A. inefficient scavenging, twice
B. Inefficient scavenging, 1.8times
C. Fewer strokes in a circle, twice
D. Fewer strokes in a circle, 1.8 times
90. If the engine is naturally aspirated, or is a small high-speed type with a centrifugal
turbocharger, the period of valve overlap, i.e. when both valves are_____, will be_____, and the exhaust valve will close some 10_____top dead center.
A. open, short, after
B. closed, short, after
C. open, long, before
D. closed, long, before
91. In a two-stroke engine, there are always a series of openings known as_____, and in some
circumstances, there are also openings known as_____, in the part of the cylinder liner inside the scavenging air box.
A. scavenging air ports exhaust ports
B. inlet ports, scavenging air ports
C. scavenging air ports, inlet ports
D. exhaust ports, inlet ports
92. In some type of two-stroke engines, besides some small holes for_____, starting valve, safety
valve, indicator cock, and so on, there is a large central opening in each cylinder cover for mounting the_____.
A. fuel valves, exhaust valve
B. exhaust valves, inlet valve
C. fuel valves, inlet valve
D. exhaust valves, fuel valve
93. IN a two-stroke engine, the piston consists of a lower part, which is named as _____and
usually made of_____, and a n upper part, which is referred to as _____and made of_____.
A. low-half, cast iron, top half, heat-resistant steel
B. low-half, aluminum, top-half, stainless steel
C. piston skirt, cast iron, piston crown, heat-resistant steel
D. piston skirt, aluminum, piston crown, stainless steel
94. In order to keep the oil film on the cylinder liner during the running-in period, the piston rings
are slightly rounded_____.
A. on both the external and internal top edges
B. on both the external top and bottom edges
C. on both the external and internal bottom edges
D. on all the four edges
95. In order to improve the working conditions of the crosshead bearings, the bearing pressure is
made _____and the peripheral speed is made _____in later designs.
A. smaller, higher
B. higher, smaller
C. smaller, smaller
D. higher, higher
96. The guide shoes are secured to the crosshead by means of_____.
A. through bolts
B. end chock bolts
C. side chock bolts
D. tap bolts
97. The pistons are cooled by oil _____the forced lubrication system.
A. supplied from
B. supplying to
C. being supplied for
D. to be supplied to
98. Sealing between the crankcase and the scavenging air boxes is achieved by means of_____.
A. the connecting rod stuffing boxes
B. the piston stuffing boxes
C. the sealing rings of piston
D. the scraper rings of pistons
99. Each stuffing box is provided with two sealing rings and three_____.
A. packing
B. rubber rings
C. distributor rings
D. scraper rings
100. The sealing rings are in for parts and pressed together around the piston rods by means of _____.
A. coil spring
B. lead wires
C. welding
D. adhesive paste
101. In a four stroke engine, which process lasts the longest period?
A. Exhaust and suction process
B. Suction and compression
C. Combustion and exhaust process
D. Working and exhaust process
102. Propulsion engines and the vast majority of auxiliary generator engines are designed to allow
a generous through-flow of scavenge air in order to control_____.
A. the lubricating oil consumption
B. the turbine blade temperature
C. the flow rate of fuel
D. scavenge air pressure
103. In today’s practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engines delivers a power about 80 percent_____ than that of the four-stroke one.
A. greater
B. better
C. smaller
D. Less
104. To prevent excessive _____in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible.
A. thermal stresses
B. bending moments
C. thermal loads
D. surface tension 105. A built-up exhaust valve is one in which_____.
A. the stem and the heads are made of the different materials
B. low-ally steel is used throughout
C. a replaceable valve disk is welded to the head
D. the self-centering action comes from motion of the valve stem in the guide
中华人民共和国海事局 2006年第3期海船船员适任证书全国统考试题(总第41期) 科目：轮机英语试卷代号：805 适用对象：无限、近洋航区3000KW及以上船舶二/三管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至74题，每题1分，第75题至78题，每题1.5分,第79题至80题, 每题10分。 一、单项选择题 1. A diesel engine is similar to a gasoline engine except that the former has no ______. A. cross-head B. spark plug C. connecting rod D. cylinder 2. A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a ______. A. slow-speed diesel B. medium-speed diesel C. high-speed diesel D. constant-speed diesel 3.Which of the diesel engine components listed increases air density and helps to improve engine operating efficiency? A. Impeller B. Compressor C. After-cooler D. Exhaust diffuser 4.For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four- stroke/cycle diesel engine because ______. A. it has a longer power stroke B. more air gets into the cylinder each stroke C. it develops twice as many power strokes at the same speed D. higher combustion pressure is developed 5.The intake valves in a diesel engine are reseated by ______. A. cam followers B. push rods C. combustion gases D. valve springs 6.According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into two main systems, namely, the constant-pressure system and ______. A. the pulse-phase system B. the pulse Doppler system C. the pulse system D. the pulse interval system 7.An over-speed safety device is usually fitted to a generator engine for______in the event of over- speed. A. cutting power off the engine B. increasing the fuel pump setting C. braking the crankshaft D. stabilizing the ship speed 8.What preventative maintenance should be done frequently to diesel engine starting air receivers? A. Drain the accumulated moisture. B. Test the relief valves. C. Watch the temperature to prevent fluctuations in pressure. D. Clean the interior to remove oil and foreign matter. 9.Immediately after any diesel engine is started, the engineer should check the ______. A. crankcase pressure B. lube oil pressure C. seawater pressure D. exhaust temperature 10. A controllable pitch propeller on a diesel driven vessel eliminates the need for ______. A. friction clutches B. disconnect clutches C. reversing gears D. reduction gears 11.In motor ship, ______is often used to recover some of the heat carried in the exhaust gases from the main engine. A. an diesel oil heater B. a waste heat boiler C. a fresh water generator D. a donkey boiler 12.An exhaust gas bypass is installed on a waste heat boiler in order to ______. A. bypass exhaust gas at high loads to prevent excessive back pressure B. bypass a portion of the exhaust gas at peak loads for better efficiency C. recycle exhaust gas to the turbocharger D. minimize moisture condensation in the boiler gas passages at low loads 13.Prior to lighting off a cold automatically fired auxiliary boiler, you should ______. A. check and regulate the water level B. close the air cock once fires are lit C. blow down the gage glass D. assure protective steam flow 14.Flame failure in an automatically fired auxiliary boiler can mostly result from a/an ______. A. incorrect electrode setting B. incorrect nozzle position C. clogged fuel nozzle D. broken high tension lead 15.Waterside scale in a fire-tube boiler may cause ______. A. increased heat transfer B. fireside erosion C. high steam demand D. overheated tubes 16.Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? I. Its discharge is continuous; II. It has no internal valves; III. Upon accidental closing of discharge valve, excessive pressure will not build up A. I, II B. II, III C. I, II, III D. II only 17.Why are removable sleeves installed on centrifugal pump shafts? A. They make it easier to replace the pump shaft packing. B. They can be economically replaced as they wear out. C. They can be removed when it is necessary to lighten the weight of the pump. D. They increase the strength of the shaft. 18.If one of the bilge system manifold valves does not properly seat, the ______. A. bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied B. bilge system will lose vacuum and prevent the other bilges from being pumped out C. bilge well aft connected to that valve will siphon(虹吸) its contents to the forward bilge wells D. discharge pressure will be too high. 19.Which of the listed statements is correct concerning the starting of centrifugal pumps? A. They should always be started with the discharge valve closed. B. They should always be started with the discharge valve opened. C. A priming pump is always required to flood the impeller suction. D. They should always be started with the sealing line valves closed. 20.The simplest method to use for determining if a centrifugal pump is operating as designed, is to ______. A. closely observe the pump discharge temperature B. close off the discharge valve, and watch for a rise in pressure C. momentarily close off the suction valve, and watch for a rise in pressure D. use a clamp on ammeter and compare the readings to past records
中华人民共和国海事局 2007年第2期海船船员适任证书全国统考试题(总第43期) 科目：轮机英语试卷代号：805 适用对象：无限、近洋航区3000KW及以上船舶二/三管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至74题，每题1分，第75题至78题，每题1.5分,第79题至80题, 每题10分。 一、单项选择题 1.______ the engines, the diesel engine is ______ used engine on board. A. Between/more commonly B. Among/the most commonly C. Between/not more commonly D. Among/ not the most commonly 2.The average pressure exerted on a piston during each power stroke is termed ______. A. indicated horsepower B. mean effective pressure C. exhaust back pressure D. compression pressure 3.The cetane number rates fuels for diesel engines according to its ______. A. antiknock characteristics B. ignition qualities C. rates of vaporization D. viscosity 4.The time between injection and ignition of the fuel is known as ______. A. turbulence lag B. after burning ratio C. pre-ignition lag D. ignition delay 5.______ controls the fuel oil temperature in order to provide oil at the correct viscosity for combustion. A. The viscosity regulator B. The temperature controller C. The flow meter D. The pressure switch 6.Constant cooling the various components of diesel engine has a number of functions except for ______. A. good lubrication B. low thermal stress C. good mechanical properties D. acid corrosion 7. A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an ______. A. torque limiter B. over-speed trip C. over-speed governor D. load limit governor 8.Engine speeds at which resonance can occur are termed ______. A. maximum speeds B. full speeds C. sea speeds D. critical speeds 9.Prolonged operation of a diesel engine with a closed cooling water system at lower than normal designed operating temperatures can ______. A. increase power output B. decrease lube oil viscosity C. eliminate fuel knock D. cause sulfuric acid formation 10.______ on a ship transmits power from the engine to the propeller. A. The automatic control system B. The speed regularly system C. The transmission system D. The compression air system 11.In a _____ boiler the hot gases from the furnace pass through the tubes while the water is on the outside. A. water-tube B. fire-tube C. exhaust gas D. composite 12.The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler ______. A.salinity is abnormally B.high steam demand is too high C.feed-water flow is low D.water level is abnormally low 13.The water in a steaming auxiliary boiler should be tested daily for ______. A. dissolved oxygen B. chlorides C. sludge D. dissolved nitrogen 14.Ignition failure in an automatically controlled auxiliary boiler could be caused by ______. A. carbon deposits on the flame scanner B. high fuel oil temperature C. low fuel oil viscosity D. high steam pressure 15.The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of ______. A. seawater contamination B. frequent surface blows C. dissolved oxygen de-aeration D. frequent bottom blows
中华人民共和国海事局 2009年第5期海船船员适任证书全国统考试题(总第48期) 科目：轮机英语试卷代号：803 适用对象：无限、近洋航区3000KW及以上船舶大管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至82题，每题1分，第83题至94题，每题1.5分。 一、单项选择题： 1. The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is . A. they operate between 150 and 450 rpm B. they are connected to the propeller by gearing C. their smaller size and weight D. they can be connected directly to the propeller without gearing 2. The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by . A. large conical springs B. compressed air pressure C. hydraulic pressure D. exhaust gas pressure 3. One of the factors limiting the amount of toad which can be put on a modem marine diesel engine is the . A. governor sensitivity B. exhaust temperature C. fuel injection pressure D. speed of the cam shaft 4. The desirable properties or a marine fuel oil should inc lude . A. high flash point and high viscosity B. low flash point and high viscosity C. low heating value and high sulphur content D. high heating value and low sulphur content 5. As the plunger moves upwards in the barrel, injection will commence once the plunger bas the spill ports and the pressure builds up. A. opened up B. closed off C. lined up D. taken off 6. In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces . A. all of the oil used by the engine through a filter B. some of the oil used by the engine through a filter C. some of the oil used by the engine through a centrifuge D. all of the oil used by the engine through a centrifuge 7. Because the circulating water is in a closed loop, is installed to cater for expansion and contraction of the water at different conditions of operation. A. an expansion joint B. a drain tank C. a head tank D. a contraction tank 8. The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the . A. inlet nozzle ring B. turbine wheel blade C. diffuser passages D. inlet volute 9. is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve. A. An air receiver B. An operating valve C. An automatic valve D. An air distributor 10. Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as . A. actuation B. sensitivity C. compensation D. promptness 11. By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a . A. tachometer B. pyrometer C. dynamometer D. calorimeter 12. When the ship is going to enter into the harbor, ____. A. change from heavy fuel oil to diesel oil for main engine B. pumping out bilge water C. change sea chest from high level one to lower level one D. test emergency generator 13. If the jacket water temperature rises rapidly above normal in a diesel engine, you should first . A. place standby cooler in operation B. reduce engine toad C. check thermostatic valve D. clean sea water strainer 14. Air cocks, usually positioned at the in a circulating system, is used to get rid of the air in the system. A. bending joint B. expansion tank C. weld D. the highest point 15. Which of the following conditions could contribute to the cracking of a diesel engine cylinder head? A. Leaking seal ring B. Insufficient heat transfer from the exhaust valves C. Blocked cooling water passages to the head D. Excessive scavenging air provided to the engine 16. of an engine crankshaft can be detected by measuring deflections of' crank webs for each unit of the engine. A. Misalignment B. Length C. Strength D. Stresses 17. can be a direct cause of faulty operation of diesel engine fuel injection nozzles. A. Excessive fuel nozzle holder cooling B. Sediment in the fuel supply C. Distortion of the fuel spray pattern D. Improper atomization of the fuel 18. When fuel is injected late into a diesel engine cylinder . A. the exhaust will be clear B. fuel consumption will be low C. all the fuel will be burned at top dead center D. fuel consumption will be high 19. A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result m the need to adjust the . A. pilot valve opening B. compensating needle valve C. compensating spring tension D. accumulator spring tension 20. Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system? A. Baffle plates that have been bent during prior removal. B. Leaks m the cooler tube nest. C. Operating the engine while maintaining a high sea water outlet temperature. D. A punctured sea water strainer supplying cooling water to the heat exchanger. 21. If the scavenge fire is of a more major nature, if there is a risk of the fire extending or if the scavenge trunk is adjacent to the crankcase with risk of a hot spot developing it sometimes becomes necessary to the engine. A. stop B. start C. speed up D. slow down 22. In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?
5.2 MARPOL73/78 公约 5.2.1 MARPOL73/78 公约中有关含油污水的排放规则 3192. If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed? A. Pump only if the discharge is led to a shore tank or barge. B. Pump only during the hours of darkness. C. Pump only on the outgoing tide. D. Pump only as much as is necessary. 3193. The scuppers should be plugged _____. A. only if fixed containment is not used B. only if portable containment is not used C. only if fixed containment drains are open D. whenever the vessel is being bunkered 3194. When discharging bilge water, which criteria must be observed? A. The requirement for the oil content of bilge water discharged is 15 ppm. B. No discharge in sensitive waters. C. Any discharge in sensitive waters. D. International, national or local requirements have to be observed. 3195. When bilge water is heated in a holding tank, which one of the following statements is not accurate? A. The relative high temperature facilitates primary gravity separation. B. Most of the oil and organic solvents are raised to the top layer. C. The relative high the temperature is, the top oil will be collected. D. The normal high temperature has little use on the separation of emulsified oil. 3196. If an oil spill occurs on deck, you should _____. A. cover the area with foam B. cover the area with absorbent material C. wash down immediately with a fire hose D. wash down immediately with an oil dispersing solvent 3197. Which of the following methods might favor oil emulsion in bilge water? A. Raising temperature. B. Less use of surfactant C. More use of solvent.
11规则大连海事最新轮机英语题库翻译（三） 作者：系统管理员来源：发布时间： [2014-02-25] 点击数： 683 1.2.2 1. A diesel engine is similar to a gasoline engine except that the former has no ______. A. piston B. connecting rod C. cylinder D. spark plug D柴油机与汽油机相似除了柴油机没有火花塞 2. Fuel oil begins to inject into the cylinder of a four-stroke diesel engine during the _____. A. intake stroke B. exhaust stroke C. power stroke D. compression stroke D燃油开始喷射进入柴油机气缸是在压缩冲程末 3. Oil for piston cooling is delivered through rod to a compartment in the piston heat, then distributed as a result of piston motion, and finally drained to the crankcase through one or more holes or pipes; this procedure is known as the _____. A. splash method B. spray method C. shaker method D. throw-off method C活塞冷却油通过活塞杆进入一个空间，由于活塞的往复运动，将通过一些小孔管加热，分配最后排放冷却油到曲轴箱，这个过程被称为震荡冷却 4. Successful combustion inside the cylinders of a diesel engine depend upon______. A. fine atomization B. high temperature C. good mixing of fuel and air D. any one of the other alternatives D柴油机气缸内完全燃烧取决于良好雾化，高温，以及燃油空气的良好混合 5. The function of diesel engine valve springs is to ______. A. hold the valves open B. keep the valves off their seats until the exhaust stroke is completed C. close the valves D. open inlet valves when the air injection cycle begins C 柴油机阀件弹簧的作用是关闭阀 6. Cast iron pistons used in large propulsion diesel engines are constructed with_____. A. no taper B. the skirt being tapered and smaller than the crown C. the skirt being tapered and larger than the crown D. the crown being tapered and smaller than the skirt D 使用在大型推进装置的铸铁活塞的建造是使用活塞头呈锥面，并且小于活塞裙
试题十九 一、单项选择题： 1.The lower section of a piston is called the ______. A. land B. skirt C. crown D. plate 2.Which cause of the following can lead to the engine not to start on air? A. starting air pressure too high B. correct timing of starting air valves C. three of the starting valves stuck D. the turning gear disengaged 3.Which of the following can be obtained by means of an indicator card? A. the peak pressure in a cylinder. B. the temperature of the cooling water. C. the fuel consumption. D. none of the above. 4.Expansion tank should be used to remove ______from cooling water. A. scale B. sludge C. chemicals D. air 5.Cracks in the cylinders and cylinder covers may result from ______. A. low speed B. unequal heating C. less lubricating D. low charge air pressure 6. A lube oil filter can be used to remove most contaminants from lube oil. A contaminant which will remain in the lube oil after filtering is ______. A. abravise B. fuel oil C. sediment D. impurities 7. A ship designed for carrying goods requiring refrigeration is called_____. A. REEFER B. RO/RO SHIP C. CONTAINER D. TANKER 8.______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve. A. An air receiver B. An operating valve C. An automatic valve D. An air distributor 9.______in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine. A. Because B. Owing to C. For D. No matter 10.The pressurized air is usually cooled to increase the charge air ______. A. viscosity B. density C. velocity D. electricity 11.Load control on a diesel engine is accomplished by ______. A. regulating the speed of the turbocharger B. rotating the fuel injector pump plunger C. regulating the speed of the fuel oil transfer pump D. changing engine timing 12.When a vessel is in dry-dock, the vessel's engineers should ______. A. examine the condition of the propeller B. chip and paint all hull protection zincs C. install new docking plugs in all cofferdams(干隔舱) D. inspect the hull for hogging or sagging 13.The gear and screw pumps are classified as ______. A. variable stroke pumps B. multistage pumps C. positive displacement pumps D. triple-ported pumps