大管轮轮机英语真题文档格式.docx

1、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68题，每题1分，第69题至76题，每题1.5分,第77题至78题, 每题10分。一、 单项选择题：1. Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an _. A. engine support vibration isolator B.

2、 detuner or viscous fluid damper C. lightened crankshaft flywheel D. spherically seated crankshaft bearing 2. Precision engine bearing inserts are manufactured with a small portion of the bearing ends extending beyond the bearing housing or caps. The installation process of these bearings requires s

3、ufficient _. A. overlap B. crush C. lap or lead D. protrusion3. The engine has one or two group of fuel pumps, depending upon _. A. the number of fuel valves B. the number of cylinders C. the speed of engine D. the power of engine 4. Which of the following statements concerning the factors affecting

4、 ignition delay is correct? A. An increase in intake air temperature will increase ignition delay. B. An increase in coolant temperature will decrease ignition delay. C. An increase in combustion chamber turbulence will increase ignition delay. D. An increase in compression ratio will increase ignit

5、ion delay. 5. _providing lubricating films, oil used in marine diesel engines has to remove heat from oil cooled piston. A. Except for B. Beside C. Except D. In addition to 6. The ability of an oil to separate cleanly from an oil and water mixture is referred to as its _. A. precipitation number B.

6、neutralization number C. pour point D. demulsibility 7. Before dismantling the pipe, would you _the oil retained in the hose with _?A. flash/fresh air B. wash/fresh water C. flush/compressed air D. rush/diesel oil 8. Before “stand by” is rung on the engine telegraph, it is usual to give the main die

7、sel engine a brief trial _ahead and astern. A. with power B. on power C. with air D. on air 9. A number of cylinder liners are enclosed in one cast iron casing to form a _. A. cylinder cover B. cylinder block C. crankcase D. bed-plate 10. Between the periods of injection and ignition of the fuel, a

8、diesel engine crankshaft rotates through the _.A. detonation period B. firing period C. delay period D. advance period11. The turbo-blower comprises a gas turbine and a _. A. condenser B. blower C. soot blower D. air receiver 12. Vessel propellers are classified as being right hand or left hand. A r

9、ight hand propeller turns clockwise when viewed from _. A. the bow B. the stern C. the port side D. the starboard side 13. _the repair in such short time is unknown to us. A. How they finished B. How did they finished C. That how they finished D. That how did they finished 14. In a simple mechanical

10、 governor, the _. A. centrifugal force rotates the ball-head B. flyweight centrifugal force is balanced by spring force C. flyweight centrifugal force is balanced by hydraulic pressure D. speeder spring alone actuates the fuel control rod 15. Wear in a cylinder liner is usually due to _. A. friction

11、 B. abrasion C. corrosion D. all of the above 16. A governor automatically controls engine speed by regulating _. A. fuel supply B. firing order C. engine load D. oil level 17. If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump _. A

12、. capacity will increase B. capacity will decrease C. suction pressure will increase D. suction pressure will decrease 18. The purpose of the wearing rings used in a centrifugal pump is to _. A. prevent an internal explosion in the pump when it is overheated B. enable a visual inspection of the pump

13、 while it is running C. insure a proper alignment of the pump coupling to the driver D. accommodate for friction between the impeller and the casing 19. When a boiler is operating, the water level in the gauge glass reads _when the boiler is shut down. A. lower than B. higher than C. as much as D. t

14、he same as 20. 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 deaeration D. frequent bottom blows 21. For a purifier changing to a gravity disc with smaller hole di

15、ameter will move the interface towards the _. A. bowl periphery B. bowl center C. upper surface D. lower surface 22. For a L.O. purifier, If the back pressure of the oil outlet is too high, the interface between oil and water in the bowl will _. A. be interrupted B. move downwards C. move outwards D

16、. retain original position 23. If a bilge pump failed to build up discharge pressure, you should check for _. A. excessive water in the bilges B. a clogged suction strainer C. oil in the bilges D. all of the above 24. The oil sludge is burnt in the _onboard. Ill show you the ashes. A. boiler B. main

17、 engine C. auxiliary engine D. incinerator 25. A class C fire would most likely occur in the _. A. engine room bilges B. main switchboard C. paint locker D. rag bin 26. If the pump for a hydraulic anchor windlass is over heating, the cause may be _. A. increased pump speed B. excessive pump discharg

18、e pressure C. too low of a tilting box angle D. low pump speed 27. The hand steering is a method by which the motion of the rudder is controlled with _. A. a motor-driven steering wheel B. a pneumatic steering wheel C. a hand-driven steering wheel D. an electric steering wheel 28. An axial piston, v

19、ariable stroke pump is used in a vessels hydraulic steering gear. Under pressure, oil continually leaks out from between the valve plate/ cylinder barrel and will _. A. cause loss of hydraulic oil from the system B. result in extreme damage to the pump C. cause damage to the pump if not continually

20、drained from the pump casing D. result in the system high side pressure to substantially drop off 29. With reference to operating a four-ram steering gear system under emergency conditions, which one of the following statements is incorrect ?A. Only one pump should be used at any time B. The ship sp

21、eed should be reduced to 70% of the normal C. Watch keeping of the steering gear should be increased D. Limitations of the steering gear should be logged but the bridge need not be informed 30. Which of the following problems could cause air to blow out through the inlet air filter of a running comp

22、ressor?A. Excessive compression in the cylinder B. A broken intake valve C. A dirty inlet filter element D. An improperly adjusted discharge valve 31. When a refrigeration compressor is in the off cycle, the thermal expansion valve will _. A. always be wide open when the compressor restarts B. conti

23、nue to operate as if the system were in operation C. remain open until evaporator pressure equalizes, then close until the compressor restarts D. always be completely closed until the compressor restarts 32. An increasing head pressure in a refrigeration system, without any corresponding change in t

24、he cooling water inlet temperature, would probably be caused by _. A. restriction in refrigerant piping B. air and non-condensable gases in the condenser C. water in the refrigerant D. flooding back of liquid refrigerant from the evaporator 33. In a refrigeration system, if the cooling water to the

25、condenser fails, the _. A. box temperature solenoid valve will close B. expansion valve will close C. compressor will shutdown D. king valve will open 34. The basic training in fire prevention and fire fighting should include the theoretical elements which should cover _. A. the three elements of fi

26、re and explosion B. lower and upper flammable limits C. classification of fires and applicable extinguishing agents D. all of the above 35. Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to _.A. reduce electrolytic action on heat exchanger metalsB. keep heat

27、transfer surfaces shiny and cleanC. prevent rapid accumulation of marine growth D. provide a protective coating on heat exchanger surfaces36. To parallel an incoming machine to a running machine therefore it is necessary to ensure firstly that _. A. two frequencies must be brought into phase B. the

28、incoming machine accepts a small amount of load C. the running machine must be unload D. both voltages are equal 37. Self-excited a.c. generator with error operated voltage control systems draw the full excitation power for the machine terminals. This dispenses with the current transformers, reactor

29、s and capacitors necessary for accurate compounding, but renders the excitation system vulnerable to variations in its output voltage. Which of the following is correct about the generator mentioned according to the sentences above?A. It consumes no excitation power. B. It has current transformers.

30、C. Components are needed for accurate compounding. D. Its excitation system is vulnerable to voltage variations 38. Which of the following should be the FIRST step in removing a generator from parallel operation?A. Trip the generator off the switchboard. B. Turn off all electrical equipment. C. Remo

31、ve the load from the off going generator. D. Increase the cycles of the generator staying on the line. 39. This arrangement is _if the elements are directly connected to one another and the control action takes place without human involvement. A. a manual closed loop B. a manual opened loop C. an automatic closed loop D. an automatic opened loop