轮机英语试题二十四

1、试题二十四一、单项选择题：1. Bedplates are the of the engine, without the support of which the shaft alignment inparticular, and engine structure as a whole, would inevitably be lost.A. hullB. projection C. graphitication D. foundation2. Which of the two events listed occurs simultaneously in a two-stroke/cycle

2、diesel engine?A. Exhaust and scavenging.B. Scavenging and compression.C. Ignition and expansion.D. Exhaust and compression.3. Which of the following may 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 six starting valv

3、es stuck.D. the turning gear disengaged.4. The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called A. explosive range B. flash point C. ignition temperature D. combustion temperature5. The function of a lubricating oil

4、 is to lubricate the running surface to carryaway a great deal of heat.A. not/butB. neither/nor C. either/orD. not only/but also6. The degree to which the viscosity of an oil will change with a change in temperature is indicated by the A. weight designation B. viscosity index C. pour point D. therma

5、l change value7. All three systems have the portsto swirl the incoming air and direct it in the appropriatepath.A. angledB. roundedC. being angled D. being rounded8. Scavenging in a four-stroke/cycle diesel engine occurs during the A. last part of the exhaust stroke, and the first part of the intake

6、 strokeB. last part of the intake stroke onlyC. early part of the injection stroke onlyD. early part of the power stroke9. in what position the engine stops there will always be at least one of the cylinderswith its starting air valve open to admit compressed air to start the engine.A. Because B. Ow

7、ing toC. ForD. No matter10. The process to remove exhaust gases by blowing in fresh air is called A. charging B. supercharging C. starting D. scavenging11. Some vessels are equipped with a water lubricated stern tube. When at sea, operating under normal conditions, the water service valve from the s

8、hip's saltwater system to the bearing should be A. closed, and no leakage permitted across the shaft packingB. closed, and only slight leakage permitted across the shaft packingC. opened, and no leakage permitted across the shaft packingD. opened, and only slight leakage permitted across the sha

9、ft packing12. The required amount in the change of speed necessary before a governor will make a corrective movement is known as A. speed droop B. sensitivityC. stabilityD. promptness13. The pressure head of a water pump is given in the unit of A. kgB. MPaC. mH 2 OD. none of theabove14. The pump dis

10、charge pressure will be considerably higher than the pressure at the A. pump entry branch B. outlet pipe C. impeller D. None of the above is true.15. A feed pump for an auxiliary boiler might lose suction if the A. boiler water level is lowB. feedwater is too hotC. boiler steam demand is lowD. feedw

11、ater is too cold16. To operate a centrifugal fire pump at reduced capacity, you should A. readjust the relief valveB. throttle the suction lineC. throttle the discharge valveD. open the priming line17. the moveable plate and floating ring inside the pump is very difficult.A. Having adjusted B. Being

12、 adjusted C. To adjustD. Adjusted18. Strainers, sometimes called, are devices designed to prevent the passage of unwantedsolids into or further along a system.A. dampersB. filtersC. stopper circuits D.separators19. A donkey boiler is A. one to supply steam to the main propulsion turbine B. an auxili

13、ary boilerC. A and BD. neither A nor B20. Which of the following statements concerning fire-tube boilers is correct?A. Combustion gases flow through the tubes. B. Flames impinge on the tubes.C. Combustion occurs in the tubes.D. Water flows through thetubes.21. Prior to lighting off a cold automatica

14、lly fired auxiliary boiler, you should A. check and regulate the water level B. close the air cock once fires are litC. blowdown the gage glassD. crack the steam stop to assureprotective steam flow22. The is not a(n) component of an oil separator.A. sliding bowl bottom B. gravity disc C. separating

15、disc D. scum valve23. A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of A. waterB. babbittC. iron or steel D. acids24. In a complete oil/water separator, more oil will separate out onto the underside of these plates and travel outwards until it i

16、s free to rise into the oil collecting space. What s the meaning of “ it” in the sentence above?A. a separator B. oilC. waterD. anoil collecting space25. The oil sludge is burnt in the onboard. I ll show you the ashes.A. boilerB. main engine C. auxiliary engine D. incinerator26. A burning AC motor w

17、ould be considered what class of fire?A. Class A' B. Class B' C. Class C'D. Class D'27. In which of the listed hydraulic systems will the installation of an oil cooler be necessary?A. Constant tension mooring winch systemB. Hatch cover systemC. Watertight door systemD. Internal combu

18、stion engine hydraulic starter system28. No specific period is given for the renewal of the lubricating oil filter element as this should be done a figure of 0.7 bars is shown on the gauge.A. whateverB. whenever C. wherever D. whoever29. If a hydraulic pump is overheating, the cause may be .A. exces

19、sive internal leakage in the pumpB. low discharge pressure andfluid flowC. excessive fluid level in the hydraulic reservoir D. operation of the pump at 100% efficiency30. Compressed air is used on board ship .A. for starting diesel enginesB. in pneumatic control systemC. in pneumatic toolsD. All the

20、 above are true.31. In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?A. Distiller air ejector cooling medium B. Saltwater heater dischargeC. First-stage internal feed boxD. Second-stage internal feed box32. Supply the before starting an air c

21、ompressor.A. fuel oilB. cooling water C. steamD. power33. Sludge may form in the crankcase of an air conditioning compressor as a result of .A. bubbling refrigerantB. overheating and oxidationC. lowered operating temperaturesD. reducing the cloud or flash point34. Ammonia when used as a refrigerant

22、is valuable because of its high efficiency, it is howeverA. toxicB. flammable C. explosiveD. all of the above35. Which of the statements listed concerning heat transfer is correct?A. Heat is always transferred at a constant rate.B. Heat transfer rate increases as temperature difference increases.C.

23、The rate of heat transfer is not affected by temperature difference.D. The high temperature region is known as a heat sink.36. If a refrigeration compressor will not start, the reason may be .A. the pressure regulating valve is not closing B. an excessive lack of refrigerant in the systemC. badly le

24、aking discharge valvesD. worn piston rings37. In a refrigeration system, if the cooling water to the condenser fails, the .A. box temperature solenoid valve will close B. expansion valve will closeC. compressor will shutdownD. king valve will open38. The power factor of an AC generator operating sin

25、gularly is determined by the .A. connected load B. prime mover speed C. field excitation D. generator's rated voltage39. A constant output voltage from an AC generator is maintained by the .A. prime mover governor B. exciter generator C. voltage regulator D. reverse power relay40. In order to ch

26、ange the direction of rotation of a D.C. motor .1. the field leads must be changed ;n . the input leads must be changedA. I onlyB. n only C. either I or nD. neither I or n41. Which of the following should be the FIRST step in removing a generator from parallel operation?A. Trip the generator off the

27、 switchboard.B. Turn off all electrical equipment.C. Remove the load from the 'off going' generator.D. Increase the cycles of the generator staying on the line.42. The purpose of a main switchboard circuit breaker's reverse-power trip is to .A. prevent main circuit overloadB. protect the

28、 circuit breaker blowout coilC. prevent alternator motorizationD. prevent low voltage tripout43. In the control action is independent on the output.A. a closed loop control systemB. an open loop control systemC. a boiler control systemD. a steering gear control system44. Which of the following marin

29、e examples belongs to the open loop control system?A. accommodation heating system B. steering gear C. boiler control D. cargo control45. The viscosity regulator controls the fuel oil temperature provide oil at the correctviscosity for combustion.A. in order that B. because of C. in order to D. owin

30、g to 46. A transformer in an electric circuit serves to .A. generate its own electrical powerB. transform electrical energy into mechanical energyC. increase or decrease circuit voltage as requiredD. convert AC current to DC current47. The liquid flowing in the capillary（ 毛细管 ） is such that the diff

31、erence in readingstaken before the capillary and after it is related to the oil viscosity.A. pressureB. velocityC. flow rateD. temperature48. Domestic water pump is started automatically by which operates as the water levelfalls to a predetermined level.A. a level controller B. a temperature switch

32、C. a floating ball D. a pressure switch49. The additional mark in the Classification Certificate for Machinery means propulsionapparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.A. BRCB. MCCC. AUT-0D. AUT-150. Low c

33、ompression of diesel engine may result from .A. a worn cylinder B. broken piston rings C. any of A and B D. none of the above51. White smoke exhausting from an operating diesel engine may indicate .A. a cracked liner B. burning lube oil C. an overloaded engine D. insufficient combustion air52. Defec

34、tive timing gear in a diesel engine may lead to:A. smoky exhaust B. starting failure C. overload D. over speed53. Poor combustion in a diesel engine can be caused by .A. high compression pressureB. low intake air temperatureC. low exhaust pressureD. high scavenge air temperature54. An automated dies

35、el engine should normally shut down due to .A. low lube oil temperatureB. high ambient air temperatureC. low lube oil pressureD. high exhaust system back pressure55. To successfully reduce an excessively high diesel engine exhaust gas temperature, you should .A. reduce the engine driven fuel pump ou

36、tlet pressureB. retard the fuel injector timing to reduce powerC. increase the fuel rack settingD. reduce the load on the engine56. , the engine must be stopped immediately.A. Should knocking occurB. If knocking occurC. Should if knocking occursD. If occur knocking57. Lower suction pressure of a pum

37、p may be caused by .A. too much air in the pipe line B. closed inlet valve C. empty tank D. leaky pipe58. Each journal and pin should be examined for and grooving.A. bridgesB. recesses C. rearsD. ridging59. A built-up exhaust valve is one in which .A. the stem and heads are made of different materia

38、lB. low-alloy steel is used throughoutC. a replaceable valve disk is welded to the headD. the self-centering action comes from motion of the valve stem in the guide60. Combustion knock can occur in the cylinders of a diesel engine under any condition permitting .A. a shortened ignition delay periodB

39、. a lean fuel/air mixtureC. excess fuel in the combustion chamber D. rapid vaporization of injected fuel droplets61. The bearing cap and shell are replaced and tightened up until .A. the “ nip ” is zeroB. the “ nap ” is zeroC. the “ gap ” is correctD. the “ clearance ” is correct62. The resistance o

40、f electric wire will decrease as its .A. length increasesB. cross-sectional area increasesC. temperature increasesD. percent of metallic purities increases63. Oil mist detectors are usually used on board to detect oil mist density within A. the engine crankcase B. the engine scavenge boxes C. drain

41、tanks D. fuel tanks64. Tools with handles should be used to check electric circuit.A. plastic B. metalC. stainless steel D. copper65. The crankcase cover should not be opened until at least minutes after the engine stops.A. 10B. 15C. 20D. 3066. “ Movement of engine no longer required. ” means “ ” .A

42、. Stop Engine B. No Engine Revolution C. Stand-by Engine D. Finished With Engine67. Under the provisions of applicable international conventions, ships entitled to fly the flag of a Party are subject, while in the port of a Party, to control by officers duly authorized by the Party. Ships of non-par

43、ties or below convention size shall be given A. more favorable treatmentB. less favorable treatmentC. no more favorable treatmentD. the most favorable treatment68. The conventions under which the port state control inspection is carried out include all the following except A. SOLAS 74 B. MARPOL 73/7

44、8 C. STCW 78/95 D. ISM Code69. If you burned your arm on a bare steam line, the most effective immediate treatment wouldbe toA. wrap the arm in a tight bandageB. soak the arm in hot salt waterC. cover the burn with petroleum jelly D. put the burn in cold water70. If liquid refrigerant accidentally c

45、omes in contact with the eyes, immediately.A. rub the eyesB.irritate the eyesC. wash the eyes with a heavy boric acid solution D. obtain medical help71. Diesel fuel is relatively safe to handle due to its low volatility （挥发）, but the fumes willself-ignite and continue to burn steadily if the fuel is

46、 heated to the A. flash point B. auto-ignition point C. volatility point D. upper explosive limit72. Duty officer informs us that the vessel is out of harbor and in “ Full Ahead ” .We are going to run A. diesel oil instead of fuel oilB. fuel oil instead of diesel oilC. diesel oil instead fuel oilD.

47、fuel oil instead diesel oil73. A（An） should be issued for every company complying with the requirement of theISM Code by the Administration.A. ISMB. DOCC. SMCD. PSC74. The term “ moderate speed” was previously interpreted as meaning a speed which would enable a vessel within half the range of visibi

48、lity.A. stopping B. being stopped C. to stopD. to be stopped二、关联题（每组关联题题干下有4 个小题，每小题4 个选项）Each of the engine cylinders is provided with a Bosch, type PF, fuel pump. The fuel pump is asingle-acting plunger pump with non-adjustable stroke. The plunger is so accurately ground and lapped that its cleara

49、nce inside the barrel is only 0.002-0.003 mm . This provides sufficient tightness between plunger and barrel, even at pressures as high as 200-400 bar, without the need for sealing materials. Neither the plunger northe barrel can therefore be renewed individually. The plunger pressure stroke is prod

50、uced by a cam on the engine camshaft, whereas the return stroke, the suction stroke is effected by means ofa strong coil spring. The top of the pump barrel is closed by a spring-loaded pressure valve, to which the fuel oil pipe for the respective fuel valve on the relevant engine cylinder is connect

51、ed.Regulation of the amount of fuel delivered by the fuel pump is achieved by turning the pump plunger, the cylindrical surface ofwhich has a milled recess. The bottom of this recess ends with an edge, which is at right angles to the cylinder generating lines, whereas the top of the recess is limited by a helix. This produces an inclined control edge on the plunger, which also has a narro