1、 http:/中华人民共和国海事局2009 年第 5 期海船船员适任统考试题（总第 48 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 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 88题，每题 1 分，第 89 题至 96 题，每题 1.5 分。一、单项选择题1. Diesel engines classified as reciprocating internal combustion engines beca
2、use they_A. use energy from fuel burned outside their cylindersB. burn fuel in a combustion chamber that moves back and forthC. burn fuel in a chamber where its energy moves a piston up and downD. a continuous combustion process to impart rotary motion to the pistons2. The abbreviation “MIP” stands
3、for _A. middle indication pressure B. mean indicated pressure C. mean indicated pitch D. middle indicated power3. The term used to express the ignition quality of a particular fuel is _A. cetane number B. octane numberC. ignition index number D. volatility point4. The period when both inlet valves a
4、nd exhaust valves are open is referred to as_A. valve loop B. valve uniflow C. valve overlap D. valve grinding5. Which of the following 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 combustio
5、n chamberB. Transmit heat from the piston to the cylinder linerC. Prevent damage to ring groove inserts by action as a heat dam.D. Dissipate combustion chamber gas pressure by channeling it through the ring gap.6. The gas loads on the engine structure are constrained by means of hydraulically preloa
6、ded_ Which connect the bed plate, frame sections and cylinder jackets into a single unit.A. connecting rods B. mean bearing C. column D. the rods7. _of different thickness are inserted between the shells to enable adjustment of the bearing clearness.A. Screws B. Films C. Dises D. Shims8. Compared to
7、 four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantages of _A. less even torque B. higher cylinder head temperaturesC. fewer power stroke per revolution D. greater weight/size requirements9. During the fuel imection period, fuel pressure must exceed cylinder gas pressure t
8、o _A. ensure penetration and distribution of the fuel in the combustion chamberB. ensure the needle valve is flushed clean during each injectionC. prevent combustion gas blowback into the open needle valveD. prevent reflected pressure waves when the needle valve closes10. The upper piston rings in l
9、arge, slow-speed, two-stroke cycle diesel engines are most effectively lubricated by oil _A. fed from mechanical lubricators B. thrown off from the main bearingsC. supplied form wick fed drip lubricators D. flow from a centrifugal banjo oiler11. In a diesel engine closed freshwater cooling system, t
10、he amount of coolant flowing through the heat exchange is controlled by the _A. section pressure regulator B. thermostatic bypass valveC. sea water temperature D. water level in the expansion tank12. The purpose of an after-cooler is to _A. reduce the turbocharger operation temperaturehttp:/B. incre
11、ase the pressure of the inlet airC. increase the density of the inlet airD. reduce the blower operation temperature13. Compressed air is supplied by air compressors to _A. the air receivers B. the starting valves C. the cylinder covers D. the distributors14. _supplies pilot air to control the cylind
12、er air start valves.A. An air receivers B. An indicator cock C. An air distributor D. A safety valve15. Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the _A. cooling water leaving each cylinder B. fuel oil entering the injectorC. exhaust gas
13、es at various locations D. lube oil at the bearing suppliers16. After starting a diesel engine, which of the listed operating conditions should be checked first?A. Air box pressure B. Lube oil pressure C. Exhaust temperatures D. Raw water pressure17. A device which functions to bring a diesel engine
14、 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 governor18. Air cocks, usually positioned at the _in a circulating systems, is used to get rid of the air in the system.A. bending joint B. expansion tank C. weld D.
15、the highest point19. Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speed. In most reduction gears, the bull gear_A. must churn the oil in the sumpB. is connected to the propeller shaftC. is driven at the highest RPMD. compensates for alignment v
16、ariations between the engine and pinion gear20. Which of the following statements concerning fire-tube boilers is correct?A. combustion gases flow through the tubes B. flames impinge on the tubesC. combustion occurs in the tubes D. water flows through the tubes21. A bypass line provided around a was
17、te heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler_A. corrosion at low engine loads B. erosion at high engine loadsC. overload at high engine loads D. scaling at all exhaust temperature22. The amount of chlonde content in the water of an auxiliary boiler can be r
18、educed by _A. adding hydrazine B. blowing down the boilerC. adding phenolphthalein D. adding a sulfite chloride scavenger23. Failure of the burner flame in an automatic auxiliary boiler would probably be a result of _A. water in the fuel oil B. broken high tension leadsC. incorrect electrode setting
19、 D. full fuel pressure at the nozzle24. Boiler water hardness is increased by _A. zero alkalimty to the water B. scale forming salts in the feedwaterC. dissolved gases in the water D. improper operation of the DS heater25. A screw pump belongs to _according to its working principleA. recipmcating pu
20、mps B. positive displacement pumpsC. dissolved gases in the water D. centripetal pumps26. A centrifugal pump operating against a closed discharge valve has a/an_A. capacity of 100% B. efficiency of 0%C. internal slippage of 0% D. shut off horsepower rating of 100%27. Before disconnecting a joint in
21、a pipeline, you should_A. determine the size of the gasket B. hang a bucket under the jointC. have a first aid kit on hand D. be sure no pressure exists in the line28. It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong direction. This would cause th
22、e pump _A. head capacity to improve B. discharge to be reversedC. efficiency to decrease D. slippage to decrease29. If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, http:/the cause is probably_A. excessive pump speed B. excessiv
23、e suction headC. worn wearing rings D. gross pump misalignment30. Properties of a good refrigeration oil include_A. low wax contentB. high pour pointC. high viscosityD. low wax content, high pour point, high viscosity31. The _ only allows for adjustment of temperature in each room by the occupant ma
24、nually controlling the air volume admitted.A. central air conditioning system B. high velocity systemC. low velocity system D. single duct system32. The process of adding moisture to air to increase the relative humidity is known as_A. sublimation B desiccation C. humidification D. miniaturization33
25、. Sludgy may form in the crankcase of an air conditioning compressor as a result of _A. bubbling refrigerant B. overheating and oxidationC. lowered operating temperatures D. reducing the cloud or floc point34. Which of the equipment listed is most effective in processing bilge slops for overboard di
26、schargeA. a 100 PPM oily water separatorB. assembling the lube oil purifier as a separator and aligning it to the bilge overboardC. a 15 PPM oily water separatorD. a magnetic duplex strainer35. When started, a complete oily water separating unit is first filled _. The oily water mixture is then pump
27、ed through the inlet pipe into the coarse separating compartment.A. with dirty water B. with clean water C. by oily water D. by mixed water36. Which is the pollution prevention equipment?A. booster pump B. evaporator C. incinerator D. cooler37. Concerning the incinerators operation, which of the fol
28、lowing is not correct?A. scavenging time should be more than 30 seconds before ignitingB. the oil temperature of waste oil tank is 80-100C. first igniting the incinerator with diesel oil when the temperature of hearth is about 600, the waste oil is drawn in.D. the ash from incinerator can be dumped
29、into sea no distance limitation38. Bacteria which live _are said to be aerobicA. in the presence of oxygen B. without oxygenC. in the presence of nutrition D. without nutrition39. For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the _A. bowl periph
30、ery B. bowl center C. upper surface D. lower surface40. To ensure lube oil purifier working in normal condition, the interval between two sludgy discharging should not exceed _ hours.A. 2 B. 4 C. 5 D. 641. Which of the following problems will occur if a disk-type centrifugal lube oil purifier is not
31、 properly primed prior to admitting oil flow to the bowl?A. Contamination of the lube oil by emulsification will resultB. The lube oil will not be subjected to the proper centrifugal forceC. The lube oil will overheat and flashD. Oil will discharge from the heavy phase discharge port and be wasted42
32、. A vacuum is initially created in a flash type distilling plant by _A. the flashing of the feed waterB. the condensation of the saltwater feedC. air ejectors, eductors, of a separate vacuum pumpD. condensation of the distillate43. On which of the following heated surfaces of a flash type evaporator
33、 would you be more likely to find soft scale http:/formation?A. Feed-water heater internal tube surfaces B. Internal distillate cooler tubesC. Flash chamber vertical surfaces D. pressure control valve44. What type of valve is used to direct the flow of hydraulic fluid?A. relief valve B. direction co
34、ntrol valveC. stop valve D. pressure control valve45. Another name for the “swash plate” in the variable delivery pump is _A. tiltable disc B. gravity disc C. distributing disc D. catch plate46. The drive motor will have a brake arranged to fail-safe, i.e. it will _the load if power fails or machine
35、 is stopped.A. lift B. put C. take D. hold47. If the pump for a hydraulic anchor windlass is over heating, the cause may be_A. increased pump speed B. excessive pump discharge pressureC. too low of a tilting box angle D. low pump speed48. When the power is shut off, the wire_A. becomes slackB. can n
36、ot be paid out unless the brake is overhauled or recover wire unless manually operatedC. will be let out because the brake is out of workD. may be pay out due to no power49. An additive used to improve the ability of a lube oil to reduce friction is known as a/an _A. suppressant additive B. dispersa
37、nt additiveC. extreme pressure additive D. viscosity improver additive50. Strainers are commonly used in hydraulic systems to _A. protect the pump from fine soluble contaminantsB. prevent solid particles from entering the pumpC. prevent solid particles from entering the filterD. protect the directio
38、nal control valves51. Current changing in direction and rising and falling in value is _A. A.C. B. D.C. C. generator D. fresh water generator52. The magnetic field is provided by electromagnet, so arranged that adjacent poles have_A. opposite polarity B. the same polarity C. negative polarity D. pos
39、itive polarity53. Prior to closing the breaker when paralleling two AC. generators, the recommended practice is to have the frequency of the incoming machine_A. slightly less than the line frequency B. the same as the line frequencyC. slightly greater than the line frequency D. have nothing to do wi
40、th the lien frequency54. The power factor at which a paralleled A.C. generator operates is usually adjusted by the _A. connected load B. prime mover speedC. field excitation D. generators rated voltage54. When you are making a high potential test on a piece of repaired electrical machinery, a rise i
41、n leakage current indicates _A. good insulation B. bad insulationC. high insulation power factor D. a high slot discharge factor56. _is not a part of the main switchboard on board.A. Busbar B. Load panel of main generatorC. Paralleling panel D. Shore connection box57. Usually, emergency electricity
42、supplies to _on boardA. cargo winch B. windlass C. steering gear D. main air compressor58. The ground terminal of a starter should be connected to _A. the common ground point B. the starters frameC. the communicator D. the starters mounting bolts59. The separate supplies are connected in either star
43、 or delta formation. The star formation is most commonly used and requires _ slip-rings on the alternator.A. two B. three C. four D. fivehttp:/60. As a general rule, the first troubleshooting action to be taken in checking faulty electric control devices is to _A. draw a one line diagram of the circ
44、uitry B. test all fuses and measure the line voltageC. take megger readings D. insulate the apparatus from ground61. When measuring AC current flow, you must always connect the meter _A. in series with the power source and loadB. in parallel with the power source and loadC. insuring correct polarity
45、D. using the lowest range possible to prevent instrument damage62. If a small electric motor is immersed in salt water it should be. . washed with free water; .dried in an ovenA. only B. only C. both and D. neither nor 63. “AMIDSHIPS”refers to _A. back of vesselB. the middle portion of a shipC. a backward movement of a vesselD. across the ship, at right angles to the fore-and-aft centerline64._is the main cause to the damage of engine parts and excess wearingA. overload B. the odds of the loadC. the default of engine parts D. overload and the odds of the load65. After “finished wit
