轮机英语大证模拟试题(三)
1. In purification, there is no fuel oil in the clean oil outlet. It could be caused by____.①too high temperature of the dirty fuel oil;②too low temperature of the dirty fuel oil;③clogged filter A.① B.①②③ C.②③ D.②
2. Which of the following would not be burnt in an incinerator (not ratified by IMO) on board?
A. oil rags
B. PVC garbage
C. waste oil
D. waste clothes
3. Which of the following statements is correct concerning the viscosity of lubricating oil?
A. Viscosity will increase as temperature increases.
B. Viscosity is a measure of a fluid's internal resistance to flow.
C. Viscosity is not dependent on temperature.
D. Viscosity will decrease as temperature decreases.
4. Which of the following conditions would cause “panting” in a steaming auxiliary boiler?
A. Faulty flame scanner.
B. Flame failure.
C. Insufficient combustion air.
D. Low water level.
5. Before replacing a piston you should cheek the rings to see that all clearances and gaps are within the permissible ____.
A. discrepancy
B. error
C. deflection D tolerance
6. While on watch in the engine room, you hear a continuous sounding of the general alarm. Which of the following actions should you take FIRST?
A. Start the fire pump and establish flow to the fire main.
B. Open the guardian valve and standby to maneuver.
C. Secure the burners then proceed to your assigned boat station.
D. Open the master control valves on the fixed CO2 system.
7. The function of diesel engine piston compression rings is to ____.
A. remove oil from the cylinder combustion space
B. transmit heat from the piston to the cylinder liner
C. prevent engine friction losses
D. prevent piston side thrust
8. Diesel engine automated control systems may utilize sensing devices of dual function with sensing ranges providing both alarm and engine shut down capability. Which of the key points would only require an alarm sensor?
A. Jacket water pressure and temperature.
B. Lube oil sump level.
C. Lube oil pressure and temperature.
D. Engine over-speed.
9. The activated sludge strength should be checked at regular intervals, and it is good that the color of the aeration compartment water is_____. A. blackish B. chocolate C. ivory-white D. yellow
10. Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve?
A. Hydraulic switch and engage jacking gear.
B. Motor drain and pneumatic control system power.
C. Electric power and starting air
D. Lube oil standby pump and control air
11. Down-comers installed on auxiliary package boiler are protected from direct contact with hot gases by_____.
A. steel baffle
B. water wall tubes
C. refractory and insulation
D. several rows of screen tube
12. Which factor determines the ring dam size for a fuel oil，tubular(管子型)bowl type, centrifugal purifier?
A. The specific gravity of the fuel.
B. The viscosity off the fuel.
C. The quantity of water to be removed from the fuel.
D. The quantity of dirt to be removed from the fuel.
13. From the separator the fuel enters____ for HFO.
A. the double bottom tank
B. the separator oil tank
C. the daily service tank
D. the setting tank
14. When securing a flash-type evaporator for an extended period of time, you should ____.
A. fill the unit with saltwater
B. completely drain the unit
C. tightly seal the unit to exclude air
D. fill the unit with de-scaling compound
15. It is necessary for the ship to contact ____ for authorization prior to undertaking mitigating actions in an oil pollution incident. A. the shipping company B. the coastal state C. the flag state D. the port state
16. In cleaning up an oil spill, the use of chemical agents would ____.
A. disperse or dissolve the oil in the water
B. not affect the oil
C. remove the oil from the water
D. absorb the oil for easy removal
17. Under normal conditions, the quantity of air circulation becomes less and less. What is the reason?
A. Dirty delivery ducts.
B. High temperature outside.
C. Too much refrigerant.
D. The fouling filters.
18. Electric insulation is made of organic substances and so gradually ____ with age.
A. becomes better
B. deteriorates
C. increases
D. are fouled
19. According to the SOLAS convention, the engine room emergency bilge water suction should connect with ____.
A. the main S.W. pump or ballast pump that have the biggest output
B. the air-conditioning water pump
C. the ballast pump
D. the main S.W. pump
20. The electrolyte in a lead-acid storage battery consists of distilled water and ____.
A. calcium chloride
B. muriatic acid
C. hydrogen chloride
D. sulfuric acid
21.A rigid liner bore which is free of_____ is ideal and, with the provision of good lubrication, provides optimum running condition for the piston and piston rings.
A. expansion
B. distortion
C. shrinkage
D. elongation
22. When reentering an engine room that has been flooded with CO2, the investigating team should initially ____.
A. attempt to operate machinery
B. enter from the lowest level
C. leave the access door partially open
D. enter from the highest level
23. A constant supply of electricity is essential for ship, and
24. When making entries in the Oil Record Book, all quantities should be ____.
A. recorded as cubic meters with a conversion to barrels
B. verified by the Chief Engineer
C. recorded directly from the oil discharge monitor
D. consistently recorded through the Oil Record Book in one specified unit (gallons, barrels, cubic meters)
25. An increased pressure differential between the inlet and outlet of a strainer usually indicates the strainer is ____.
A. holed
B. dry
C. clean
D. fouled
26. AC and DC generators are similar in that they ____.
A. both rectify the voltage before delivery
B. both supply three-phase power
C. are constructed at the same physical size for the same kilowatt rating
D. both generate alternating voltages
27. If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be ____.①gas freed ②inert ③filled with water
A. ①③
B. ①
C. ②③
D. ①②③
28. Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?
A. Neither natural convection nor forced convection.
B. Forced convection only.
C. Both natural convection and forced convection.
D. Natural convection only.
29. The normal color of the exhaust gas of the diesel should be ____.
A. black
B. achromatism or thin gray
C. thin white
D. sky-blue
30. The ground terminal of a starter should be connected to ____.
A. the commutator
B. the starter's frame
C. the starter's mounting bolts
D. the common ground point
31. If a centrifugal pump vibrates and is noisy when operating, the cause could be ____.
A. worn wearing rings
B. reversed pump coupling
C. worn gland sealing shaft
D. a bent shaft
32. A diesel engine with a combustion chamber located between the crowns of two pistons is known as a(an) ____.
A. double-acting engine
B. horizontal acting engin e
C. single-acting engine
D. opposed pistons engine
【关联题】
After ensuring that the “nip” is correct the bearing clearance should be checked. The bearing cup and its associated half shells are removed leaving the other half in position. Two pieces of pure lead wire are placed across the journal at positions one-third and two-thirds along its length. The cap and shell are replaced and tightened up until the “nip” is zero. The cap and shell are then removed and the thickness of the lead wire measured by a micrometer. It is important to use only pure lead, which is very soft, and to choose a thickness of wire, which is greater than the normal allowable clearances but not greater than twice this amount. The clearance should be within the manufacture’s limits. As a guide these will be approximately 0.1 to 0.2 mm for white metal bearings and approximately 0.25 to 0.4 mm for copper-lead or tin-aluminum bearings with crankshaft journal diameters in the range from about 200 to 400m
33. (4) Which of the following statements is true?
A. The cap and shell are not to be tightened until the “nip” is zero.
B. The cap and shell haven't been tightened when the “nip” is zero.
C. The cap and shell are to be tightened until the “nip” is zero.
D. The cap and shell begin to be tightened when the “nip” is zero.
34. (3)According to the passage, the clearance for white metal bearing should be _______.
A. within about 0.25 to 0.4
B. in the range from about 0.1 to 0.2 mm
C. larger than 0.2 mm
D. less than 0.1 mm
35. (2)According to passage, the thickness of the lead wire should be measured _______.
A. until the cap and shell are removed
B. after the cap and shell have been removed second time
C. when the cap and shell are being removed
D. before the cap and shell are removed
36. The lead wire should be put on the upper surface of the journal ________.
A. vertically
B. longitudinally
C. transversely
D. angularity
37. The main generators are connected to ____.
A. section boards
B. emergency switch boards
C. main switch boards
D. distribution boards
38. The resistance to the movement of the globule in oily water mixture depends on its size and the ____ of the fluid. A. pressure B. viscosity C. velocity D. gravity
39. The term used to express the ignition quality of a particular fuel is_____.
A. ignition index number
B. cetane number
C. octane number
D. volatility point
40. Moisture in a D.C.motor would cause ____. A. short circuit B. speed up C. hunting D. slow down
41.The switchboard of the emergency generator doesn’t have_____.
A. voltmeter and change-over switch
B. synchronous meter
C. ammeter and change-over switch
D. frequency meter
42. In a diesel engine cooling water system, a pH of 6.0 indicates a(an) ____.
A. slightly acidic condition
B. neutral condition of water
C. slightly alkaline condition
D. over treatment of water
43. While paralleling two AC generators using synchronizing lamps only, both lamps will go dark when the generators are ____. A. grounded B. running at the same speed C. of the same polarity D. in phase
44. When it is necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be_____. A. purged B. evacuated C. dehydrated D. plugged
45. If separating effect is not good, which measure should be taken?
A. Improving impulse of water flow.
B. Working at intervals and properly heating
C. Reducing water supply flow.
D. Warming up to 80℃, increase water supply flow.
46. _____ diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the
A. High speed/ the cylinders
C. Large crosshead type/ the cylinder
D. Four-stroke/pistons and cylinders
47. ______has a simultaneous suction action and discharge action.
A. The gearwheel pump
B. The double acting displacement pump
C. The centrifugal pump
D. the single acting displacement pump
48. Which of the following factors determines the interval between discharges of a self-cleaning separator?
A. the volume of the bowl
B. the separating temperature
C. the content of impurities in the fuel oil
D. the rated throughput
49. Which problems can occur if the brake band lining of a windlass brake becomes excessively worn?
A. The brake's effectiveness will be reduced.
B. The driving engine will over-speed.
C. The clutch will overheat.
D. The anchor will immediately drop.
50. In reference to air conditioning, when air attains the maximum mount of moisture it can hold at a specific temperature, it is said to be ____. A. saturated B. condensed C. convected D. superheated
51. The objectives of the ISM Code are to ensure ____.①safety at sea ②prevention of human injury or loss of life
③avoidance of damage to the marine environment and to property
A. ②③
B. ①②
C. ①②③
D. ①
52. In order to limit the introduction of alien species by ship, ____ was adopted on 13 Feb,2004 at the IMO.
A. Revised MARPOL Annex Ⅰ
B. International convention for the control and management of ships' ballast water and sediments
C. Revised MARPOL Annex Ⅱ
D.ISPS Code
53. The Pork State Control officer may witness a fire drill carried out by the crew assigned to these duties on the ____.
A. Navigation Log Book
B. Oil Record Book
C. Muster List
D. Engine Room Log Book
54. The magnetic field is provided by electromagnets so arranged that adjacent poles have ____.
A. the same polarity
B. positive polarity
C. opposite polarity
D. negative polarity
55. Which of the listed conditions can be considered as the single greatest cause of accidents?
A. Excitement.
B. Human error.
C. Speed.
D. Excessive knowledge or skill.
56. A class “D” fire would be considered as burning ____.
A. magnesium
B. electrical equipment
C. oil
D. wood
57. ____ is the main reason that reduces the power advantage of a two-stroke engine over a same size four-stroke one to about
1.8 times.
A. Short strokes in a circle
B. Fewer strokes in a circle
C. Inefficient scavenging
D. Less fuel oil burning
58. The drive motor will have a brake arranged to fail-safe, i.e. it will ____ the load if power fails or machine is stopped.
A. take
B. put
C. lift
D. hold
59. An independent bilge suction is required for ____.
A. ballast tanks
B. machinery space bilges
C. cargo hold bilges
D. sludge tanks
60. Each of the engine cylinders is lubricated from a lubricator, driven by ____.
A. a separated motor
B. the engine's camshaft
C. the engine's piston
D. a turbine
【关联题】
In view of the damage to the environment, and the cleaning-up costs which could arises as a result of a major oil spillage, it is important that all officers be aware of the consequences of oil pollution, and of the measures necessary to prevent it. Spills of oil on board need not result in pollution of the sea if simple safeguards are observed. Included in the various Company and Government anti-pollution measures are a series of checks which the United States Coast Guard require to be carried out when handling oil cargoes in the United State. These include plugging of scuppers, inspection of the line connections at the manifold, as well as sealing off the overboard discharge valves. The United States Coast Guard uses a check-list to ensure that no precaution is overlooked, and a similar check-list should always be used by ship s’ personnel at any port. Another important aspect of pollution precaution is good communication between the shore operatives and the ship’s officers over every aspect of the planned operation.
61. (4) What does the Passage mainly talk about?
A. A major oil spillage
B. Oil pollution prevention measures
C. The consequences of oil pollution
D. The United States Coast Guard inspection.
62. (3) There is no serious consequences of pollution caused by oil spillage if ____.
A. oil pollution precautions are taken
B. a good communication between ship and shore is kept
C. everyone is aware of the consequences
D. the cleaning-up costs are not too large
63. (2) Which is not mentioned in the Company and Government anti-pollution measures?
A. Closing scuppers
B. Covering the overboard discharge valves tightly
C. Good communication between Company and its ship
D. Inspecting the line connections at the manifold
64. (1)The USCG use a check-list so that____.
A. ships’ personnel may have a similar copy
B. they can inspect the ships one by one according to the list of ships
C. they can have a good understanding with the ship’s officers
D. they will not miss any item to be inspected
65. When the order given by officer may have bad results, the duty engineer should ____.
A. inform the captain and not perform it
B. stop the M/E immediately and then inform the captain
C. inform the captain for a further consideration
D. stop the M/E immediately and then inform the chief engineer
66. Purging air from a hydraulic system is necessary when ____.
A. adding small amounts of oil to the system
B. the system has been drained and then filled with new oil
C. the system has been overheated
D. the system has been idle for a long period of time
67. Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?
A. Blow-down the water gage glass
B. Lift the safety valves by hand.
C. Inspect and clean all solenoid valves.
D. Test boiler water alkalinity
68. The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives them. The difference is termed ____.
A. nip
B. gap
C. lip
D. nap
69. In the process of engine stand-by, warm-up the engine usually through preheating______ of the diesel engine.
A. water of the jacket water system
B. water of the cooling system and L.O.of the L.O.system.
C. L.O.of the L.O.system.
D. fuel of the F.O.system
70. “Movement of engine no longer required” means “____”.
A. Stop Engine.
B. No Engine Revolutions.
C. Stand-by Engine.
D. Finished With Engine.
71. The crank-room cover should not be opened until at least ____ minutes after the engine stops.
A. 20
B.10
C. 15
D. 30
72. The additional mark ____ in the Classification Certificate for Machinery represents the propulsion apparatus is remotely controlled on the navigating bridge control station, and engine room is watched by duty personnel.
A. AUT-1
B.MCC
C.AUT-0
D. BRC
73. The officer in charge of the engineering ____ the watch to the relieving officer if there is reason to believe that the latter is obviously not capable of carrying out the watch-keeping duties effectively.
A. shall not take over
B. shall hand over
C. shall not hand over
D. shall take over
74. Which of the turbo-charging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?
A. Constant velocity.
B. Axial flow.
C. Pulse pressure.
D. Constant pressure.
75. The abbreviation “MIP” stands for ____.
A. middle indicating power
B. mean indicate pressure
C. mean indicated pitch
D. middle indicated pressure
76. During the dock repair, each sea valve must be disassembled, cleaned and ground well. Before it reassembled, the sealing surface between the valve and the valve seat should be checked by ____before reassembled.
A. chief engineer
B. surveyor
C. the engineer
D. the technique personnel of the shipyard
77. An increase in rotor clearances in a rotary pump will ____.
A. decrease pump capacity
B. decrease pump cavitation
C. decrease reaction ring clearance
D. increase discharge pressure
78. In a vacuum boiling evaporator, the fresh water generated is pumped out by ____.
A. a feed water pump
B. a condensate pump
C. an air ejector
D. a brine pump
79. Heat which brings about a change in the physical state of a substance without a change in temperature is called____.
A. ambient heat
B. latent heat
C. sensible heat
D. specific heat
80. Hydraulic control check valve is generally used to ____ in the marine hydraulic mechanism.
A. permit oil flow with reversed direction
B. control the back pressure of return oil
C. act as relief valve
D. lock the oil lines under some conditions
81. The air supplied to a diesel engine is compressed to ____.①provide heat for the ignition of the fuel; ②decrease injection delay. A.② B. Neither①and②are correct. C.① D.①②
82. ____ are generally formed in the frame of the both in-line and Vee engines to give maintenance access to the crankshaft main and connecting rod large end beading.
A. Doors
B. Coupling
C. Blind
D. Aspirate gauze
83. For the oil purifier, the water content of the oil is continuously_____ and when a pre-set maximum level is reached a total discharge function is automatically actuated.
A. compensated
B. monitored
C. charged
D. computed
84. STCW78/95 Convention describes that ____ are laid down for the certification of engineer officers in charge of a watch in
a traditionally manned engine room, or the designated engineer in a periodically unmanned engine room.
A. available minimum requirements
B. available maximum requirements
C. mandatory minimum requirements
D. mandatory maximum requirements
85. V oltage will always lead current in a(an) ____.
A. inductive circuit
B. resistive circuit
C. capacitive circuit
D. magnetic circuit
86. ____ have replaced derricks on many modern ships.
A. Cranes
B. Winches
C. Hydraulic motors
D. Capstans
87. The packing installed in the pump stuffing box is lubricated by ____.
A. grease cups
B. leakage through the stuffing box
C. hand during installation
D. gravity and feed oil cups
88. ____ means the level for which minimum appropriate protective security measures shall be maintained at all times.
A. Security level 3
B. Security level 1
C. Security level 4
D. Security level 2
89. The frequency of an AC generator is controlled by the ____.
A. exciter
B. governor
C. theostat
D. capacitor
90. Failure to remove calcium and magnesium from feedwater before if reaches the boiler can result in tube_____.
A. scaling
B. pitting
C. erosion
D. sludging
91. A ship’s propeller operates most efficiently at rotational speed especially in the case of____ used in cargo ships.
A. the controllable pitch propeller
B. the constant pitch propeller
C. the large diameter propeller
D. the small diameter propeller
92. The IOPP certificate is valid for ____. A. two years B. four years C. five years D. one years
93. The pump has a constant stroke and the amount of fuel delivered is regulated by rotating ____ which has a specially arranged helical groove cut into it.
A. the pump miller
B. the pump cylinder
C. the pump cam
D. the pump plunger
94. When administering artificial respiration to an adult, the breathing cycle should be repeated about ____.
A. 30 to 45 times per minute
B.12 to 15 times per minute
C. 45 to 60 times per minute
D. as fast as possible
95. Which one is the “clear grounds” for a more detailed inspection?
A. One of ship's certificates required is invalid.
B. Damaged sanitary pump.
C. Paint peeling off the uptake.
D. No operation procedures for the oil separators.
96. The most critical part of the bunkering operations, which can result in an oil spill, is when the ____.
A. system is being lined up
B. pumping operation is first started
C. hose joints are made up
D. tanks are being topped off
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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
47期轮机英语考试题目 一单项选择题 A1.The___ engine is used for alternators and some times for main propulsion provide a propeller of between 90 to 120 rpm. A.four-stroke B.two-stroke. C.slow speed D.reversible B2.The abbreviation”MIP”stands for____, A.middle indicating pressure B.mean indicated pressure C.mean pitch D.middle indicated power D3.The cetane number of a diesel fuel oil indicates its____. A.viscosity B.acid content C.heating value D.ignition quality C4.In a two-stroke engine the camshaft rotates at___the enging rotational speed. A.half B.twice C.the same speed as D.four times D5.A diesel enging is similar to a gasoline engine except that the former has no ____. A.cross-head B.cylinder C.connecting rod D.spark plug C6.It is easier to replace a dry cylinder liner than a wet one because____. A.of the thin wall thickedss B.honing makes it easier to maintain the desired oil film C.water seals are not required D.it fits more loosely due to a decrease in heat transfer through the composite wall D7.A main bearing consists of two shells which are secured by means of studs and____. A.tie rods B.though bolts C.lead wires D.bearing caps C8.However fast or slow the combustion rate,it is still a____between carbon,hydrogen,sulph and oxygen that releases heat. A.physical deformation B.state exchange C.chemical reaction D.coalescence A9.During the fuel injection period,fuel pressure must exceed cylinder gas pressure to____. A.ensure penetration and distribution of the fuel in the combustion chamber B.ensure the needle valves is flushed clean duringeach injection C.prevent combustion gas blowback into the open needle valve Dprevent reflected pressure waves when the neddle valve close. B10.In a diesel engine lube oil system ,which of the following parts should be lubricated first? A.Camshaft bearings B.Main bearings C.Piston crowns D.Cylinder walls B11.In a diesel engine closed freshwater cooling system,the amount of coolant flowing through the heat exchanger is controlled by the _____, A.suction pressure regulator B.thermostatic bypass valve C.sea water temperature D.water level in the expansion tank
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?
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
试题二十三 一、单项选择题： 1.Because the castings of smaller engines are not so big and heavy, ______ and cylinder block may be made in one piece. A. the column B. the jacket C. cylinder cover D. cylinder liner 2.______ 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 3. A common trouble with the fuel pump plungers or fuel valve spindle is______. A. broken down B. stuck C. oil leakage D. carbonized 4.Diesel fuel oil having a low cetane rating can result in ______. A. improved cold weather starting B. smoother engine operation C. combustion knock D. reduce ignition lag 5.______ is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a storage tank. A. A filter B. A centrifuge C. A distiller D. A generator 6.The emulsion of the oil is mainly caused by ______. A. the solid impurities of large particle B. the solid impurities of fine particle C. the water content D. both water and solid impurities 7.Cylinders of marine diesel engines are normally cooled by ______. A. sea water B. fine mineral oil C. sanitary water D. fresh water 8.______ are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder. A. Diffusers B. Compressors C. Steam boilers D. Soot blowers 9.______ device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed. A. An automatic B. A transmission C. A self-regulating D. An interlocking 10.The difference between a supercharged engine and an un-supercharged engine is that ______ operates at an increased pressure. A. the later B. the latter C. the former D. the farmer 11.______ for attachment to the propeller shaft also accommodates the turning gear and is integrally forged with the crankshaft. A. The coupling flange B. The camshaft C. The cross-head pin D. The cylinder jackets 12.A(n) ______is a chemical or electro-chemical attack on the metal surface which may be further increased if the sea-water is polluted. A. errosion B. corrosion C. cavity D. scouring 13.The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being ______. A. shut B. closing C. opened D. closed 14.The governor of a generator engine is to ______. A. make the engine stop
第46期轮机英语试题 一单项选择题 D1. In order to concrol thermal stresses ,some types of modern engines use pistons with __ A heavy wall and intensive cooling B heavy wall and no cooling Cthin wall and no cooling D thin wall and intensive cooling B2. The average pressure exerted on a piston during each power stroke is termed A indicated B ean effective pressure C exhaust back pessure D compression pressure A3. The ignition quality of a diesel fuel is indicated by the___ A cetane number B volatility point C viscosity index Doctane number B4. A piston in a four stroke cycle disesel engine makes four stroke during each __ A crankshaft revolution B mechanical cycle of operation C period of two cobustion cycles D cycle of two events C5. Crankshafts of medium speed engines are _____from a single piece of steel A unusually solid welded B never be solid forged C almost invariably D almost invariably be welded B6 .The starting air entering the cylinder begins when the piston ______ A has nearly come to the TDC B has just past the TDC C has nearly come to the BDC D has just past the BDC D7 .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 B8 .Compared to four stroke cycle engines ,two ~stroke /cye diesel 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 A9. _____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 metet DThe pressure switch B10. In a diesel engine lube oil system ,which of the following parts should be lubricated first ? A camshaft bearings B Main bearings C Piston crowns D Cylinder walls C11 A large ,low speed ,main propulsion diesel engine uses sea water to directly cool the ________ A cylinder heads B exhaust valves C scavenging air D injectors D12. In a rubocharger ,inlet air velocity is increased in the __________ A inlet nozzle ring B stationary diffuser passages C compressor outlet volute D rotating impeller vanes C13 .Each cylinder has one starting valve which is usually opened by air pressure and closed by _________ A nuts and bolts B new joints C spring force D sealing rings B14. In a simple mechanical governor ,the _________ A centrifugal force rotates the ball-head