轮机英语历年真题47期

1、中华人民共和国海事局2009第1期海船船员适任统考试题(总第47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88题，每题1分，第89题至96题，每题分。一单项选择题1. The _ engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller o

2、f between 90 to 120 rpm.A. four-stroke B. two-stroke C. slow speed D. reversible2. The abbreviation “MIP” stands for _.A. middle indicating pressure B. mean indicated pressureC. mean indicated pitch D. middle indicated power3. The cetane number of a diesel fuel oil indicates is _.A. viscosity B. aci

3、d content C. heating value D. ignition quality4. In a two-stroke engine the camshaft rotates at _ the engine rotational speed. A. half B. twice C. the same speed as D. four times5. A diesel engine is similar to a gasoline engine except that the former has no _. A. cross-head B. cylinder C. connectin

4、g rod D. spark plug6. It is easier to replace a dry cylinder liner than a wet one because _. A. of the thin wall thickness 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 wall7

5、. 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 caps8. However fast or slow the combustion rate, it is still a _ between carbon, hydrogen, sulphur and oxygen that releases heat. A. physical deformation B. state

6、exchange C. chemical reaction D. coalescence9. 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 valve is flushed clean during each injection C. prevent combustion

7、gas blowback into the open needle valve D. prevent reflected pressure waves when the needle valve closes10. 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 walls11. In a diesel engine clos

8、ed 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 tank12. Which of the diesel engine components listed increases air densit

9、y and helps to improve engine operating efficiency? A. Impeller B. Air bottle C. Air cooler D. Exhaust diffuser13. A large two-stroke direct reversing diesel engine is to be reversed. Prior to the admission of starting air you must _. A. line up the engine for restarting with light diesel oil B. rep

10、osition the fuel injection cam C. change the intake and exhaust valve cam positions D. place the starting cam in the intermediate position14. Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generation? A. Sensitivity B. Power C

11、. Speed droop D. Compensation15. 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 injector C. exhaust gases at various locations D. lube oil at the bearing supplies16. After

12、 starting a diesel engine, which of the listed operating conditions should be checked first? A. Air box pressure B. Lube oil pressure C. Exhaust temperature D. Raw water pressure17. To shut down a diesel engine after it exceeds the set maximum speed, which type of device listed should be used? A. Sp

13、eed limiting governor B. Over-speed governor C. Over-speed trip D. Over-speed relay18. The treatment of the fuel oils involves storage, heating, filtering and _. A. centrifuging B. pressurizing C. atomization D. igniting19. A propeller, in order to operate efficiently, must rotate at a relatively _

14、speed.A. high B. low C. fast D. lowly20. Latent heat changes the _ of water.A. physical state B. temperature C. atmospheric pressure D. sensible pressure21. The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent _. A. accidental dry firing

15、 and overpressure B. uncontrolled fires in the furnace C. explosion in the boiler furnace D. overheating of the pressure parts22. Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler could result in _. A. increased fuel consumption B. increased feed-water consumpti

16、on C. explosions in the boiler furnace D. overheating of the pressure parts23. Burner ignition failure in an automatically fired auxiliary boiler would be caused by _. A. a burned out solenoid in the oil supply valve B. high temperature excess air C. incorrectly setting the hot-well dump valve D. an

17、 incorrectly positioned burner snubber (缓冲器) relay24. If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be _. A. high steam pressure in the boiler B. abnormally high feed-water temperature C. abnormally high boiler water temperature D. steam demand

18、 exceeding feed pump capacity25. Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid _ pressure. A. depending on B. in relative to C. regardless of D. because of 26. A spur gear pump should be operated with the discharge valves _. A. slightly op

19、ened B. throttled C. fully opened D. halfway opened27. An independent bilge suction is required for _. A. ballast tanks B. sludge tanks C. machinery space bilges D. cargo hold bilges28. To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the _. A. pump must always be pri

20、med B. volute must impart a radial and rotary motion of the water C. suction side connection must guide the liquid to the lantern rings D. stuffing box should not be allowed any water leakage29. An inadequate reciprocating bilge pump discharge is most often caused by _. A. defective safety valves B.

21、 clogged suction strainers C. scarred cylinder walls D. clogged drain valves30. In a compression refrigerant plant, the hot, high pressure refrigerant gas is cooled by the sea water and becomes liquid in the _. A. compressor B. condenser C. throttle valve D. evaporator31. The _ only allows for adjus

22、tment of temperature in each room by the occupant manually controlling the air volume admitted. A. central air conditioning system B. high velocity system C. low velocity D. single duct system32. The opening of the humidifiers valve of air-conditioner should be _, when the circumstance temperature i

23、s raised to above 58C in the winter. A. decreased B. increased C. fixed D. closed33. Under normal conditions, the quantity of air circulation becomes less and less. What is the reason? A. dirty delivery ducts B. too much refrigerant C. the fouling filters D. high temperature outside34. When bilge wa

24、ter is heated in a holding tank, which one of the following statements is not accurate? A. The relative high temperature facilitates primary gravity separation. B. Most of the oil and organic solvents are raised to the top layer. C. The relative high the temperature is, the more the top oil will be

25、collected. D. The normal high temperature has little use on the separation of emulsified oil.35. If separating effect of the oily water separator is not good, we can improve it by _. A. flushing separator with cold water B. increasing bilge water supply flow C. heat oily water properly D. opening ma

26、nual oil discharge valve36. Which is the pollution prevention equipment? A. booster pump B. evaporator C. incinerator D. cooler37. When does auxiliary burner of rotary nozzle type incinerator put into use? I. when igniting II. the waste oil for dealing with is too much III. before stopping incinerat

27、or A. I +II B. I+III C. II+III D. I+II+III38. When anaerobic bacteria convert the sewage to an inert sludge, _. A. no oxygen is needed B. oxygen is necessary C. oxygen is given off D. no gas is produced 39. For a L.O. purifier, if the back pressure of the oil outlet is too high, the interface betwee

28、n oil and water in the bowl will _. A. be interrupted B. move downwards C. move outwards D. retain original position 40. When separating the lube oil without additive, it is usually working with hot water, the aim is to remove _ from it. A. acid B. oil sludge C. mechanical impurity D. salinity 41. I

29、f the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the _. A. oil has a tendency to emulsify in the bowl B. purifier will act as a clarifier at the discharge ring C. oil will lost through the water discharge ports D. oil solids will be deposited only at the int

30、ermediate top disk 42. Tube leaks in the distillate cooler of a two stage flash evaporator will result in _. A. loss of second stage vacuum B. contamination of the distillate C. lower feed inlet temperature D. contamination of the second stage condenser 43. Small droplets of water entrained in the f

31、lashed vapor produced in a flash-type evaporator, are removed by the _. A. spray pipes B. demisters C. condensers D. splash baffles 44. Overflow valve is usually used to _. A. control the fluid flow through it B. prevent the pressure before overflow valve over the specified value C. make the pressur

32、e after overflow valve steady D. control the direction of oil flow 45. Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy? A. the hydraulic pumps B. valves C. hydraulic 46. Cargo handling unit is rated according to the _ to be lifted.

33、 A. cargo crane B. jib C. safe working load D. oil pressure 47. The part of the anchor windlass that engages the anchor chain for lifting is called the _. A. warping head B. fairlead C. wildcat D. capstan 48. In automatic _, the winch may be overhauled and wire is paid off the barrel at a pre-determ

34、ined maximum tension. A. cranes B. windlass C. capstans D. mooring winches 49. The major source of chemical contaminants in hydraulic fluid is _. A. microscopic steel shavings B. abrasive waste C. anti-oxidant compounds D. oxidation by-products50. Before doing any work on a hydraulic system equipped

35、 with accumulators, you should _. A. drain the accumulators and purge with oxygen B. bleed off all stored energy from the accumulators completely C. charge the accumulators to prevent system energy loss D. pump the hydraulic fluid into the accumulators to prevent fluid loss51. One factor that determ

36、ines the frequency of an alternator is the _. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnetic used D. output voltage52. The frequency output of an operating alternator is controlled by the _. A. relative speed of the rotor poles B. number of tu

37、rns of wire in the armature coil C. strength of the magnetic used D. output voltage53. 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 frequen

38、cyC. slightly greater than the line frequency D. have nothing to do with the line frequency 54. If two A.C. generators are to be operated in parallel, the load is distributed evenly by _. A. means of rheostat B. a balance coil C. adjusting the governor settings D. changing excitation55. The first re

39、quirement for logical troubleshooting of any system is the ability to _. A. collect all available data on a casualty B. recognize normal operation B. identify the probable cause of a symptom D. isolate the faulty component56. _ is (are) not power supplied by main switchboard directly. A. Steering ge

40、ar and windlass B. Navigation light and radio power panel C. Navigation device power box D. Daily fresh water pump57. The emergency generator or emergency battery is connected to _ on most large ships. A. distribution boards B. section boards C. emergency switch boards D. main switch boards58. _ con

41、nectors hold best if a wire is accidentally pulled or a connection becomes loose. A. Ring type B. Fork type C. Spade type D. Push on, push off type59. The primary function of an electric motor is to _. A. develop torque B. generate high voltages C. produce a magnetic field D. generate high electrica

42、l resistance60. Fuses placed in series with a thermal trip-type circuit breaker are used for _. A. time-delay protection B. short-circuit protection C. short duration surge protection D. sustained overload protection61. Shore power must be _ during dock repair. A. disconnected B. switched off C. cut

43、 off D. connected62. The operator of electrical motors should keep a constant check on the loads they carry because _. A. low loads necessitate frequent insulation cleaning B. exceeding nameplate values shortens useful life C. energy is wasted if full loading is not utilized D. power factor correcti

44、on methods are load dependent63. Before a marine diesel engine is started the cylinders and pistons must be _. A. cooled to appropriate temperature B. warmed up gradually to appropriate temperature C. opened up and renewed D. ground and polished 64. _ is a precaution which contributes to avoiding tr

45、ouble under normal operating conditions. A. Constant inspection B. Keeping constant load C. Remaining constant temperature D. Varying speed65. During ship maneuvering, when the diesel is stopped, which of the following items is wrong? A. keep all systems running normally B. main engine is available

46、at any moment C. shut off the starting air bottle outlet valve D. pay attention to the changes of the system parameters 66. A tank which has been scaled for a long period of time can be dangerous because _. A. steel surfaces consume oxygen by rusting B. sealed tanks usually form a vacuum C. moisture

47、 condenses in the tank, displacing the oxygen D. most tank coatings give off poisonous effect is essential to extinguish the fire is _.68. Fires in escaping flammable gas are quickly brought under control by _. A. stopping the flow of gas B. reducing the chemical chain reaction C. increasing the oxy

48、gen supply D. cooling below the autoignition point69. Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent? A. Carbon dioxide is corrosive when exposed to fire B. Carbon dioxide should be applied slowly to a large engine room fire. C. Its total

49、cooling effect is far greater than water. D. Its smothering effect is excellent for class B fires.70. While on watch in the engine room, you hear a continuous sounding of the general alarm. Which of the following actions should you take? A. Make an entry in the official logbook. B. Open the master c

50、ontrol valves on the fixed CO2 system C. Start the fire pump and check discharge pressure. D. Secure auxiliary condenser overboard discharge.71. To determine that a compartment contains sufficient oxygen to sustain life, you should use a/an _. A. explosimeter B. oxygen indicator C. fresh air indicat

51、or D. emergency escape breathing device72. If the overflow tank high-level alarm sounds while the fuel oil tanks are being topped off, the engineer should _. A. close the static leg filling valve B. close the overflow tank filling valve C. reduce the fuel oil pumping rate D. stop the fuel oil pumpin

52、g operation73. The _ tool is used in precision work to smooth or enlarge a slightly undersized hole. A. round out B. round file C. reamer D. hole driller74. During the dock repair, each sea valve must be disassembled, cleaned and ground well, the sealing surface between the valve and the valve seat

53、should be checked and ratified by _ before reassembled. A. chief engineer B. surveyor C. the engineer D. the technique personnel of the shipyard75. The additional mark _ in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control

54、 station, and engine assembly control station is unmanned periodically. A. BRC B. MCC C. AUT-0 D. AUT-176. The Oil Record Book, as a part of the ships official logbook, shall be kept on board and preserved for a period of _. A. 3 years after making the first entry B. 2 years after the last entry C.3 months after last entry D. 3 years after the last entry77. The valid period of the International Oil Pollution Prevention Certificate