轮机英语测试卷

1、轮机英语测试卷（本试卷卷面总分100分，及格分为60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100题，每题1分。 单项选择题：1. If an auxiliary diesel engine does not shut off, the trouble may beA. leaky fuel injectors B. low firing pressureC. high firing pressure D. seizure of pistons2. If an auxiliary diesel engine st

2、alls frequently , the main cause may be _.A. faulty ftiel injection equipmentB. excessive crankshaft clearanceC. an incorrectly assembled governor idle springD. high exhaust back pressure from one cylinder3. If the engine does not start on air, it may be due to _. A. low compression of the fuel pump

3、s B. incorrect timing of fuel pumps C. the starting air valves stuck D. air-locks in fuel oil pipeline4. If the engine does start on air, but combustion does not immediately begin, the cause may be_. A. failure of the fuel pumps B. starting air pressure too low C. stop valve in air line closed D. th

4、e turning gear still engaged5. In _ the incoming air is directed upwards, pushing the exhaust gases before it and then the exhaust gases travel down. A. loop scavenging B. cross scavenging C. uniflow scavenging D. supercharging6. In _ the incoming air passes over the piston crown then rises towards

5、the cylinder head. The exhaust gases are forced before the air passing down and out of exhaust parts located just above the inlet ports. A. loop scavenging B. cross scavenging C. uniflow scavenging D. supercharging7. In an oil cooler circulated by sea water, the oil is at a larger pressure, the resu

6、lt being that any leak in the cooler will mean a loss of _. A. oil B. sea water C. refrigerant D. fresh water8 .In an ordinary diesel engine the fuel injection begins _. A. after TDC B. before TDC C. after BDC D. before BDC9. On opposite ends of a single shaft of a turboblower are a gas driven _ and

7、 a air compressor, which are sealed each other. A. charge air receiver B. scavenging air belt推荐精选 C. turbine D. air cooler10. On the top of the cylinder is mounted the cylinder cover which is pressed onto _ of the cylinder liner by means of nuts and studs. A. the camshaft B. the flange C. the ridge

8、D. the bulge11. Sealing between the crankcase and scavenging air boxes for a two-stroke diesel engine is achieved by means of _. A. the connecting rod stuffing boxes B. the rings in the stuffing boxes C. the sealing rings of piston D. the scraper rings of piston12. Sediment collects in a tubular pur

9、ifier _. A. on top cover B. on sides of bowl C. in drain line on the discs D. on the discs13. The _ chamber is enclosed between the cylinder head and piston. A. lubrication B. injection C. cooling D. combustion14. The _ or balance tank collects the re-circulated fuel oil. A. buffer B. sump C. bilge

10、D. overflowing15 The crank pin journal is provided with large bores for _. A. lubrication B. cooling C. balancing purpose D. ventilation16 The crank throws are displaced from _ to obtained the same number of degrees between the different crank throws. A. one another B. the other C. each other D. eac

11、h others17 The crankshaft is of the semi built type, with the journal _ the forged or cast steel crank throws. A. shrunk into B. expanded into C. extended into D. designated into18。The crankshaft rests in bearings built into cross girders of _. A. A-shape frame B. cylinder block C. the bed-plate D.

12、the double bottom19 The crankshaft should be turned by means of _ to see that all parts move freely. A. a steering gear B. a chain gear C. a turning gear D. a sever motor20 The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which recei

13、ves them. The difference is termed "_". A. nip B. nap C. gap D. lip21 The lube oil in the bearings is drawn from a _, usually located in the bed- plate . A. tank B. sump C. vessel D. bottle推荐精选22 The lubricating oil is pumped from the drain tank, very often with _ in the suction line. A. a

14、 filter B. a strainer C. a magnetic filter D. a fine strainer23 The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the _ cycle. A. two-stroke B. four-stoke C. long-stroke D. short-stroke24 The oil is drawn from a drain tank through _, one of a pa

15、ir of pumps, into one of fine filters. A. a strain tank B. a head tank C. a service tank D. a strainer25 The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree of alkalinity to _ the acid conditions. A. invade B. provide C. detergent D. neutralize26

16、The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the _ caused by the friction at the bearings. A. acids B. additives C. heat D. gear27 The quantity of oil injected into the cylinder can be regulated _. A. by turning the pump plunger B. by

17、 vary the fuel valve spring force C. by no means by controlling the governor28 The remaining oil in the lubricating pipes and dusts should be blown out with _. A. atmosphere B. the fresh water C. compressed air D. chemical compounds29 The turbo-blower comprises a gas turbine and a _. A. condenser B.

18、 blower C. soot blower D. air receiver30 The two halves of connecting rod large end bearing are held together by _. A. bridges B. tap bolts C. jack bolts D. shims31 The two-stroke cycle begins with the piston _ , with the air inlet ports or scavenge ports in the sides of the cylinder being opened. A

19、. coming down from the B. D. C B. coming up from the B. D. C C. coming down from the T.D.C D. coming up from the T.D.C32 The withdrawing of the cylinder liners, in general, depends on their _. This may amount to approximately 1/120 of the diameter in some engines. A. correct maneuvering B. wear C. w

20、orking efficiency D. maintenance33 When the order"_"is received from the bridge, the main air stop valve in the starting air line should be shut.推荐精选 A. stand-by engine B. full ahead C. finished with engine ' D. full away34 When the piston is pushed down , it forces the engine to do wo

21、rk on the crankshaft which in turn drives _. A. the ship's rudder B. the ship's propeller C. the turning gear D. the thrust bearing35 Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accom- plished _. A. during the valve overlap period B. with only the exhaus

22、t valve open C. at a pressure below atmospheric D. without cooling the cylinders or pistons36 Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of _. A. fuel oil vapor at the sludge tank vent B. unburned fuel vapors in the scavenge air receiver

23、C. lube oil vapors in the crank case D. lube oil vapors in the engine room37 Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a _.A. high temperature and a high viscosity B. high temperature and a low viscosityC. low temperature

24、 and a high viscosity D. low temperature and a low viscosity38 High firing pressures and a low exhaust temperature in a diesel engine may result fromA. decreased piston to cylinder head clearanceB. increased exhaust system back pressureC. early fuel injection timingD. low scavenge air temperature39

25、Diesel fuel oil having a low cetane rating can result in _. A. improved cold weather starting B. smoother engine operation C. combustion knock D. reduce ignition lag40 The governor controlling a diesel engine modulates crankshaft RPM by adjusting the _. A. intake air supply B. turbocharger speed C.

26、fuel injection pumps D. engine speed droop41 High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can becaused by _. A. engine overload B. low combustion temperature C. plugged fuel nozzle holes D. excessive compression pressure42 The main purpose of the piston oil scr

27、aper rings is to _.推荐精选A. seal the space between the piston and the linerB. reduce the amount of lube oil burned in the combustion chamberC. transmit heat from the piston to the cylinder linerD. damp out fluctuations of the piston side thrust43 What causes diesel fuel to be ignited in the cylinder o

28、f an operating diesel engine?A. Spark plug B. Heat of compressionC. Carburetor D. Glow plug44 Some pumps use packing as sealing gland. The gland should be _.A. slack enough to allow slight leakage of fluidB. slightly clockedC. brought up tight so as not to allow any leakageD. fitted with a relief va

29、lve45 Air chambers are usually fitted to reciprocating pumps in order to _.A. increase discharge pressure B. increase suction vacuum C. develop pulsation flow D. keep a steady rate of flow46 In a ordinary cargo crane, _ is fitted to rotate the crane. A. the slewing motor B. the luffing motor C. the

30、hoisting motor D. none of the above47 The crane is usually mounted on a pedestal to offer adequate _ to the operator. A. time B. space C. length D. visibility48 A refrigprant boils and vaporizes in the _ in a compression refrigeration system.A. liquid receiver B. compressorC. condenser D. cooling co

31、il49A refrigerant gives up heat when it goes through _.A. condenser B. regurgitateC. evaporator D. boil coil50It should be ensured that only _ vapor is handled by the refrigeration compressorA. humidity B. dry C. steam D. oil51Moisture should be kept out of an R-12 system because it tends to cause A

32、. icing of the automatic controls B. embrittlement of some parts of the automatic controls C. sludge in the lubricating oil D. all of the above52Air that may enter a refrigeration plant tends to collect in the _ A. upper part of the receiver B. upper part of the condenser推荐精选 C. down stream end of t

33、he cooling coil D. outlet end of the condenser53 With reference to a two ram actuating mechanism, which one of the following statement is false? A. The rams work inside cylinders. B. The cylinders have glands sealing their open ends. C. The rams are connected to a cross-head. D. The cross-head is mo

34、unted on the rudder stock.54 With reference to an axial piston pump, which one of the following statements is true ? A. The cylindrical barrel is coupled to the motor. B. The cylindrical barrel has an odd number of bores. C. The bores end in sockets. D. The sockets fit in the swash plate.55 Addition

35、al heat extraction from the exhaust gases can be effected by adding an _ section to the unit in plants. A. air cooler B. economizer C. injector D. air blower56 If a heavy sea strikes the rudder, the shock is transmitted through _ to the rams, this cause a sudden increase in oil pressure in one of th

36、e cylinders. A. the control rod B. the hunting gear C. the floating ring D. the tiller arm57 The control rod of a steering gear pump is attached at its outer end to _. A. the hunting gear B. the rudder stock C. the rudder controller D. the feedback unit58 Where tanks are arranged for either oil or b

37、allast _ must be fitted in the pipeline. A. a change-over chest B. a head tank C. a emergency bilge pump D. an air cooler59 The refrigerating agent can _ at low temperature in the evaporator.A. expand B. evaporateC. condense D. distil60Generating tubes in waste heat boilers are finned to _. A. reduc

38、e gas flow turbulence B. prevent exhaust gas corrosion C. increase the rate of combustion D. increase the rate of heat transfer61 The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of _. A. seawater contamination推荐精选 B. frequent surface blows C.

39、dissolved oxygen deaeration D. frequent bottom blows62 Fins are installed on the generating tube surfaces in waste heat boilers to _.A. prevent soot fires in the exhaust systemB. prevent exhaust gas erosion of the tubesC. increase the velocity of exhaust gas flowD. increase the rate of heat transfer

40、63 Excessive vibration of an automatically fired auxiliary boiler can be caused by _ A. air or water in the furnace B. combustion pulses C. fuel oil pump failure D. flame failure64Thermostatic expansion valve are_. A. either all the way open or all the way closed B. normally open C. throttled depend

41、ing on load D. controlled by suction pressure65If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator, the trouble may be _. A. excessive condenser cooling water B. warm food in the refrigerator C. a shortage of refrigerant D. s shortage of c

42、ompressor oil66Which of the listed conditions can lead to cavitation in a centrifugal pump?A. Vapor pockets formed in the suction flow streamB. Rough casing volute surfacesC. Worn wearing ringsD. Heavy fluid in the flow stream67 Which of the following descriptions best identifies the operating princ

43、ipal of a flash-typeevaporator?A. Sea water is heated to boiling temperature while under a vacuum.B. Sea water is passed over heated plates in a thin film.C. Heated sea water is injected into a vacuum chamber.D. Sea water is forced through a heated eductor.68 If a centrifugal pump vibrates and is no

44、isy when operating, the cause could be _.A. worn gland sealing shaftB. worn wearing ringsC. a bent shaft推荐精选D. reversed pump coupling69 Distilled water from an evaporator may be discharged into a potable water tankA. through a detachable hose connectionB. after passing through an activated charcoal

45、filterC. after chemical analysis shows it is fit for consumptionD. through a solenoid operated three-way valve70If the discharge valve is closed before the drive motor is stopped, which of the followingtypes of pumps will most likely be damaged?A. Centrifugal B. GearC. Propeller D. Tuibine71 When th

46、e relief valve opens it discharges high pressure refrigerant vapor to the _.A. liquid strainerB. refrigerant inlet of the condenserC. inlet side of the evaporatorD. suction side of the compressor72 The pressure of a liquid leaving the pump can be referred to as the _.A. total head B. discharge headC

47、. net positive suction head D. suction head73 Tube leaks in the distillate cooler of a two stage flash evaporator will result in _.A. loss of second stage vacuumB. contamination of the distillateC. lower feed inlet temperatureD. contamination of the second stage condenser74. 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 air 75. Defective timing gear in a diesel engine may lead to: A. smoky exhaust B. starting failure C. overload D. over speed 76. Poor com