轮机英语试题十八

1、试题十七一、单项选择题：1. the supercharge pressure is, power an engine develops.A. The higher/the more B. Higher/more C. Higher/little D. The higher/the less2. The opening or closing of the cylinder starting valve is controlled by A. the starting air distributorB. the cut-off valve on the air mainC. the main s

2、tarting valveD. the air bottle control valve3. 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. rods are not in proper condition so that too much fuel is su

3、pplied to the correspondingcylinder.A. PistonB. SoundingC. RegulatingD. Connecting5. An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the A. propeller hub B. lignum vitae C. shaft packing D. labyrinth seal6. About half an hour

4、 before the engine is required, cooling water at must be circulated inprinciple.A. more than the working temperature B. less than the working temperatureC. the working temperatureD. the same as the surroundingtemperature7. The lubricating oil is pumped from the drain tank, very often with in the suc

5、tion line.A. a filterB. a strainer C. a magnetic filterD. a fine strainer8. When the propeller blades are integral with the hub, the propeller is called a A. built up propeller B. solid propeller C. controllable pitch propeller D. suction back propeller9. When a vessel is in dry-dock, the vessel'

6、;s engineers should A. examine the condition of the propellerB. chip and paint all hull protectionzincsC. install new docking plugs in all cofferdams D. inspect the hull for hogging or sagging10. If the engine does start on air, but combustion does not immediately begin, the cause maybeA. failure of

7、 the fuel pumpsB. starting air pressure too lowC. stop valve in air line closedD. the turning gear still engaged11. Some vessels are equipped with a water lubricated stern tube. When at sea, operating under normal conditions, the water service valve from the ship's saltwater system to the bearin

8、g 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 shaft packing12. While standing by the engi

9、ne, You should .A. drain oil service tank B. check lube oil level C. start fuel oil pump D. All of the above13. The difference between a supercharged engine and an un-supercharged engine is that operates at an increased pressure.A. the laterB. the latterC. the formerD. the farmer14. Within the cycle

10、 of a forced circulation auxiliary water-tube boiler, part of the water flashes into steam, and the remaining hot water is .A. collected in the lower portion of the steam accumulator for re-circulation back to the heatingcoil or water tankB. returned to the lower drum via down-comers due to density

11、difference for reheatingC. passes through the domestic heating system return line steam traps to the auxiliary feed supplytankD. automatically dumped into auxiliary feed heater and reheated by auxiliary exhaust back pressure15. Grind the .A. keywayB. shaftC. packingD. valve16. Which of the following

12、 pumps is used where a relatively high pressure and small capacity are required?A. volute pump B. diffuser pumpC. reciprocating pump D. all of theabove17. A centrifugal pump vibrates excessively during operation. Upon disassembling the pump it is found that the impeller is out of balance. Without an

13、 available spare, you should .A. drill holes through the heavy side of the impeller until it balancesB. weld counterweights to the light side of the impellerC. remove metal from the heavy side by machining in a latheD. acid wash and scrape the heavy side until it balances18. Lube oil pumps taking su

14、ction from the sump of most small marine engines are usuallyA. of the diaphragm typeB. of the centrifugal typeC. of the positive displacement type D. independently driven by electric motors19. If air at 95 dry bulb temperature and 50% relative humidity is conditioned to 75 drybulb temperature and 50

15、% relative humidity, it is an example of .A. cooling only B. cooling and humidifying C. cooling and dehumidifying D. adiabatic cooling20. In its simplest form the pressure reducing valve is opened or closed by which isbalanced by the downstream pressure acting on a diaphragm.A. adjusting a nut B. a

16、pre-tensioned spring C. any spring D. upstream pressure21. A donkey boiler is .A. one to supply steam to the main propulsion turbine B. an auxiliary boilerC. A and BD. neither A nor B22. The purpose of the safety relief valves installed on an auxiliary boiler is to A. relieve excess fuel oil pressur

17、e during the“ off ” fire cycleB. admit water to the dry pipeC. throttle the forced draft fan output for proper combustionD. reduce excess steam pressure in the boiler23. Prior to lighting off a cold automatically fired auxiliary boiler, you should A. check and regulate the water level B. close the a

18、ir cock once fires are litC. blowdown the gage glassD. crack the steam stop to assureprotective steam flow24. Sediment collects in a tubular purifier A. on top cover B. on sides of bowl C. in drain line on the discs D. on the discs25. Where an excessive level of contamination is detected an alarm is

19、 sounded and diverting valves are operated. The discharging liquid is then passed to A. overboardB. a bilge wellC. a slop tank D. a hot well26. The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, is called th

20、e A. absolute humidity B. relative humidity C. specific humidity D. total humidity27. Fire detecting systems on merchant vessels may be arranged to sense A. smokeB. rate of temperature rise C. ionized particles D. all of theabove28. The is used to handle the cargo.A. steering gear B. windlassC. deck

21、 crane D. warping drum29. When air becomes trapped in the hydraulic fluid of a steering system, the A. rudder will respond sluggishlyB. hydraulic rams will over-speedC. sight glass will show bubblesD. ram relief valves will lift30. After installing a new hydraulic pump in a system, what special atte

22、ntion should be given to the hydraulic system?A. The relief valves in the system should be readjusted.B. The filters and strainers should be checked frequently.C. All system pressure should be readjusted.D. The system should be drained and renewed with a fluid of different operating characteristics.

23、31. Which is the pollution prevention equipment?A. booster pump B. evaporator C. incineratorD. cooler32. Condensate formed within the first-effect tube nest of a double-effect, low pressure evaporator, is removed by a A. series of baffles B. crossover pipe C. condensate separator D. drain pump33. Af

24、ter passing through the expansion valve the refrigerant should be in the state of A. vapor B. liquidC. solidD. None of the above is true.34. The dew point of air is reached when the wet bulb temperature is .A. twice the dry bulb temperatureB. 10 above the dry bulb temperatureC. 5 above the dry bulb

25、temperature D. equal to the dry bulb temperature35. Differential pressures can be measured with the use of a .A. diaphragm type gage B. pressure transducer C. manometer D. all of the above36. is the circulation and refreshing of the air in a space without necessarily a change oftemperature.A. Refrig

26、eration B. Air conditioning C. Ventilation D. Heating37. Which of the following statements is true concerning all three-phase alternators?A. Each has three separate but identical armature windings acted on by one system of rotating magnets.B. Each has one armature winding acted on by three identical

27、 but separate systems of rotating magnets.C. All three-phase alternators are designed to operate with a 0.8 leading power factor.D. The three phases always provide power to the load through three sets of slip rings and brushes.38. The part of the shipboard electrical system used to control the distr

28、ibution of power to the branch circuits, is the .A. bridge control panel B. disconnect links C. governor relay box D. main switchboard39. The main generators are connected to .A. distribution boards B. section boards C. emergency switch boards D. main switch boards40. Self-excited a.c. generator wit

29、h error operated voltage control systems draw the fullexcitation power for the machine terminals. This dispenses with the current transformers, reactors and capacitors necessary for accurate compounding, but renders the excitation system vulnerable to variations in its output voltage. Which of the f

30、ollowing is correct about the generator mentioned according to the sentences above?A. It consumes no excitation power .B. It has current transformers.C. Components are needed for accurate compounding.D. Its excitation system is vulnerable to voltage variations41. Temperature control valves installed

31、 in the jacket cooling water system of a diesel engine, modulates the rate of water flow through the .A. cooling water pump B. nozzle cooling passages C. cylinder jackets D. heat exchanger42. While the parallel operation, must be used.A. ammeter B. voltmeter C. synchroscope D. A+B+C43. The is a crys

32、tal which, under pressure, produces an electric current which varies withthe pressure.A. alternator B. glass thermometer C. burdon tube D. piezoelectric pressure transducer44. When the current flow through a copper wire increases, its A. resistance will decreaseC. temperature will increase45. UMS st

33、ands for .A. ultra much spaceC. unit machined spaceB. insulation will burnD. conductivity will increaseB. universal medium systemD. unattended machinery space46. A signal derived from a controlled function and returned to the initiating point is calleda/anA. monitoring signal B. inverse signal C. re

34、verse signal D. feedback signal47. To repair a small electrical motor that has been submerged in saltwater, you should .A. wash it with fresh water and apply an external source of heatB. renew the windingsC. send it ashore to an approved service facilityD. rinse all electrical parts with a carbon te

35、trachloride cleaning solvent and then blow dry the motor with compressed air48. The correct tightening is obtained by use of to measure the extension given to the bolts.A. pressure gauges B. stretch gauges C. thermometers D. bridge gauges49. A diesel engine is operating with excessively high exhaust

36、 temperatures at all cylinders. To correct this condition, you should first .A. reduce the engine loadB. increase the cooling water flowC. increase the lube oil pressureD. adjust the fuel rack50. Combustion knock can occur in the cylinders of a diesel engine under any condition permitting_.A. a shor

37、tened ignition delay periodB. a lean fuel/air mixtureC. excess fuel in the combustion chamber D. rapid vaporization of injected fuel droplets51. The bearing cap and shell are replaced and tightened up until .isA. the “ nip “ is Bze. rtohe “ nap “ isCz. ethroe “ gap “ is correDc.t the “ clearance cor

38、rect52. is a precaution which contributes to avoiding trouble under normal operatingconditions.A. Constant inspectionB. Keeping constant loadC. Remaining constant temperature D. Varying speed53. White smoke exhausting from an operating diesel engine may indicate .A. a cracked liner B. burning lube o

39、il C. an overloaded engine D. insufficient combustion air54. , the engine must be stopped immediately.A. Should knocking occurB. If knocking occurC. Should if knocking occursD. If occur knocking55. During , the starting air valves should be closed to prevent the engine from turning.A. overhaulB. run

40、ning C. blowing down D. All of the above arecorrect.56. Each journal and pin should be examined for and grooving.A. bridges B. recesses C. rears D. ridging57. A water pump can not supply water after starting. It may be caused by .A. closed discharge valve B. broken pipe line C. worn shaftD. both A a

41、nd B58. A centrifugal pump can t supply water after starting. You should check .A. priming water B. power supply C. packing gland D. bearing lubrication59. When starting a reciprocating pump, the inlet valve should be .A. closedB. opened fully C. cracked open D. partly open60. It is well known that

42、the whole power distribution of the ship s electrical services mainlydepend on the .A. sub-boards B. main switchboards C. emergency switchboards D. distribution boards61. Defective timing gear in a diesel engine may lead to:A. smoky exhaust B. starting failureC. overload D. over speed62. If the jack

43、et water temperature of an operating diesel engine suddenly rises above normal, the cause can be attributed to .A. an overfilled expansion tankB. excess chromate treatment of the jacketwaterC. a clogged raw water sea suction D. cavitation erosion of the heat exchanger tubes63. The SMS should provide

44、 for specific measures aimed at promoting the of equipmentor systems the sudden operational failure of which may result in hazardous situations.A. visibilityB. abilityC. reliabilityD. capability64. In the engine department, the is looked upon to provide the leadership that is needed.A. captainB. chi

45、ef engineerC. chief officerD. chiefmotorman65. If you must enter a room or compartment to combat the fire , keep an escape path .A. openB. closeC. opensD. closes66. , we kept removing the pistons.A. Late as it was B. As it was late C. Since it was late D. Because of its late67. After fuel tanks have

46、 been topped off, which of the listed procedures should be followed next?A. The pressure-vacuum relief valve should be reset.B. The tanks should be made seaworthy to prevent contamination.C. The tanks should be sounded to make sure the levels are not rising.D. The tanks should be marked with a bull

47、stamp on the manifold filling valve68. The order “ Bow thrust stop. ” means“ ” .A. Bow thrust full to portB. Bow thrust full to starboardC. No bow thrust revolutionsD. No stern thrust revolutions69. The most important characteristic of a fire extinguishing agent to be used on electrical fires isfor

48、the agent to be .A. non-conductingB. flame resistant C. easily removable D. wet70. A sometimes called filters, is a device designed to prevent the passage of unwantedsolids into the system.C. SeparatorD. StrainerA. Steam trap B. Check valve71. In cleaning up an oil spill, the use of chemical agents

49、would A. absorb the oil for easy removalB. remove the oil from the waterC. disperse or dissolve the oil in the waterD. not affect the oil72. If a fire ignites in the engine room as a result of a high pressure fuel oil leak, you should FIRST A. secure the ventilationB. find a soda acid extinguisherC.

50、 shut off the fuel oil supplyD. secure the generator73. As soon as you hear the fire and emergency signal, you should ensure that the A. ring buoys are thrown overboardB. engines are stoppedC. fire pumps are startedD. life preservers have been issued toeveryone74. If a small fire initially breaks ou

51、t in the engine room , in which of the following sequences should the fire extinguishing agents or systems be used?A. Fixed CO 2 , semi-portable CO 2 ,then hand portable CO2.B. Semi-portable CO 2 ,fixed CO 2 , then hand portable CO2.C. Hand portable, semi-portable CO 2 , then as a last resort the fi

52、xed CO2 system.D. Hand portable, fixed CO 2 , then as a last resort the semi-portable CO2.二、关联题（每组关联题题干下有4 个小题，每小题4 个选项）Where routine maintenance is concerned, the governor should be checked regularly for adequate lubrication. The operating range is usually quite small, giving a tendency for them to

53、 wear over limited areas. Then a sudden and larger change in speed than normal may carry the governor onto a ridge of debris or gummy oil deposit so that it may stick at that point. To restrict this problem as far as possible, the governor pivots, slide, etc. should be cleaned and well lubricated wh

54、enever possible. It should be born in mind that the governor structure is such that, were the spring to fracture in any way, the flyweights would be able to move outwards and shut the engine down. The connections from the governor to the fuel racks should be designed in such a way that the governor

55、can both increase and decrease the fuel within the bounds of some hand setting; i.e. the governor can adjust the fuel settings but cannot release more fuel to the engine than is dictated by some predetermined value set by the engine operator.To overcome the above limitations of the CF governor, serv

56、o governors have beendeveloped. These use the power of hydraulics to pump the heavier fuel rack systems associated with larger engines into the desired position. This powered operation is rapand accurately achieved, and the hydraulic flow can be either electrically or mechanically controlled. The speed sensing can be done by a tachometer arrangement that can be set to the de