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轮机英语测试卷

《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 be

A. leaky fuel injectors

B. low firing pressure

C. high firing pressure

D. seizure of pistons

2. If an auxiliary diesel engine stalls frequently , the main cause may be _____________.

A. faulty ftiel injection equipment

B. excessive crankshaft clearance

C. an incorrectly assembled governor idle spring

D. high exhaust back pressure from one cylinder

3. If the engine does not start on air, it may be due to _____________.

A. low compression of the fuel pumps

B. incorrect timing of fuel pumps

C. the starting air valves stuck

D. air-locks in fuel oil pipeline

4. 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. the turning gear still engaged

5. 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. supercharging

6. In _____________ the incoming air passes over the piston crown then rises towards 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. supercharging

7. In an oil cooler circulated by sea water, the oil is at a larger pressure, the result being that

any leak in the cooler will mean a loss of _____________.

A. oil

B. sea water

C. refrigerant

D. fresh water

8 .In an ordinary diesel engine the fuel injection begins _____________.

A. after TDC

B. before TDC

C. after BDC

D. before BDC

9. On opposite ends of a single shaft of a turboblower are a gas driven _____________ and a

air compressor, which are sealed each other.

A. charge air receiver

B. scavenging air belt

C. turbine

D. air cooler

10. 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

D. the bulge

11. 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 piston

12. 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 discs

13. The _____________ chamber is enclosed between the cylinder head and piston.

A. lubrication

B. injection

C. cooling

D. combustion

14. The _____________ or balance tank collects the re-circulated fuel oil.

A. buffer

B. sump

C. bilge

D. overflowing

15．The crank pin journal is provided with large bores for _____________.

A. lubrication

B. cooling

C. balancing purpose

D. ventilation

16．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. each others

17．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 into

18。The crankshaft rests in bearings built into cross girders of _____________.

A. A-shape frame

B. cylinder block

C. the bed-plate

D. the double bottom 19．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 motor

20．The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives them. The difference is termed "_____________".

A. nip

B. nap

C. gap

D. lip

21．The lube oil in the bearings is drawn from a _____________, usually located in the bed- plate .

A. tank

B. sump

C. vessel

D. bottle

22．The lubricating oil is pumped from the drain tank, very often with _____________ in the suction line.

A. a filter

B. a strainer

C. a magnetic filter

D. a fine strainer 23．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-stroke

24．The oil is drawn from a drain tank through _____________, one of a pair of pumps, into one of fine filters.

A. a strain tank

B. a head tank

C. a service tank

D. a strainer

25．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. neutralize

26．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. gear

27．The quantity of oil injected into the cylinder can be regulated _____________.

A. by turning the pump plunger

B.. by vary the fuel valve spring force

C. by no means by controlling the governor

28．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 compounds 29．The turbo-blower comprises a gas turbine and a _____________.

A. condenser

B. blower

C. soot blower

D. air receiver

30．The two halves of connecting rod large end bearing are held together by _____________.

A. bridges

B. tap bolts

C. jack bolts

D. shims

31．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. 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.C 32．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. working efficiency

D. maintenance

33．When the order"_____________"is received from the bridge, the main air stop valve in the starting air line should be shut.

A. stand-by engine

B. full ahead

C. finished with engine '

D. full away

34．When the piston is pushed down , it forces the engine to do work on the crankshaft which in turn drives _____________.

A. the ship's rudder

B. the ship's propeller

C. the turning gear

D. the thrust bearing 35．Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accom- plished _____________.

A. during the valve overlap period

B. with only the exhaust valve open

C. at a pressure below atmospheric

D. without cooling the cylinders or pistons

36．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

C. lube oil vapors in the crank case

D. lube oil vapors in the engine room

37．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 viscosity

C. low temperature and a high viscosity

D. low temperature and a low viscosity 38．High firing pressures and a low exhaust temperature in a diesel engine may result from

A. decreased piston to cylinder head clearance

B. increased exhaust system back pressure

C. early fuel injection timing

D. low scavenge air temperature

39．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 lag 40．The governor controlling a diesel engine modulates crankshaft RPM by adjusting the ____.

A. intake air supply

B. turbocharger speed

C. fuel injection pumps

D. engine speed droop 41．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 pressure 42．The main purpose of the piston oil scraper rings is to _____________.

A. seal the space between the piston and the liner

B. reduce the amount of lube oil burned in the combustion chamber

C. transmit heat from the piston to the cylinder liner

D. damp out fluctuations of the piston side thrust

43．What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?

A. Spark plug

B. Heat of compression

C. Carburetor

D. Glow plug

44．Some pumps use packing as sealing gland. The gland should be ___________.

A. slack enough to allow slight leakage of fluid

B. slightly clocked

C. brought up tight so as not to allow any leakage

D. fitted with a relief valve

45．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 flow

46．In a ordinary cargo crane, ___________ is fitted to rotate the crane.

A. the slewing motor

B. the luffing motor

C. the hoisting motor

D. none of the above

47．The crane is usually mounted on a pedestal to offer adequate ___________ to the operator.

A. time

B. space

C. length

D. visibility

48．A refrigprant boils and vaporizes in the __________ in a compression refrigeration system.

A. liquid receiver

B. compressor

C. condenser

D. cooling coil

49．A refrigerant gives up heat when it goes through __________.

A. condenser

B. regurgitate

C. evaporator

D. boil coil

50．It should be ensured that only ______ vapor is handled by the refrigeration compressor

A. humidity

B. dry

C. steam

D. oil

51．Moisture should be kept out of an R-12 system because it tends to cause

A. icing of the automatic controls

B. embrittlement of some parts of the automatic controls

C. sludge in the lubricating oil

D. all of the above

52．Air that may enter a refrigeration plant tends to collect in the _________

A. upper part of the receiver

B. upper part of the condenser

C. down stream end of the cooling coil

D. outlet end of the condenser

53．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 mounted 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．Additional 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 blower

56．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 the cylinders.

A. the control rod

B. the hunting gear

C. the floating ring

D. the tiller arm

57．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 unit

58．Where tanks are arranged for either oil or ballast _________ must be fitted in the pipeline.

A. a change-over chest

B. a head tank

C. a emergency bilge pump

D. an air cooler

59．The refrigerating agent can ___________ at low temperature in the evaporator.

A. expand

B. evaporate

C. condense

D. distil

60．Generating tubes in waste heat boilers are finned to _______________.

A. reduce gas flow turbulence

B. prevent exhaust gas corrosion

C. increase the rate of combustion

D. increase the rate of heat transfer

61．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

62．Fins are installed on the generating tube surfaces in waste heat boilers to __________.

A. prevent soot fires in the exhaust system

B. prevent exhaust gas erosion of the tubes

C. increase the velocity of exhaust gas flow

D. increase the rate of heat transfer

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 failure

64．Thermostatic expansion valve are__________.

A. either all the way open or all the way closed

B. normally open

C. throttled depending on load

D. controlled by suction pressure

65．If 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 compressor oil

66．Which of the listed conditions can lead to cavitation in a centrifugal pump?

A. Vapor pockets formed in the suction flow stream

B. Rough casing volute surfaces

C. Worn wearing rings

D. Heavy fluid in the flow stream

67．Which of the following descriptions best identifies the operating principal of a flash-type evaporator?

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 noisy when operating, the cause could be _________.

A. worn gland sealing shaft

B. worn wearing rings

C. a bent shaft

D. reversed pump coupling

69．Distilled water from an evaporator may be discharged into a potable water tank

A. through a detachable hose connection

B. after passing through an activated charcoal filter

C. after chemical analysis shows it is fit for consumption

D. through a solenoid operated three-way valve

70．If the discharge valve is closed before the drive motor is stopped, which of the following types of pumps will most likely be damaged?

A. Centrifugal

B. Gear

C. Propeller

D. Tuibine

71．When the relief valve opens it discharges high pressure refrigerant vapor to the ________.

A. liquid strainer

B. refrigerant inlet of the condenser

C. inlet side of the evaporator

D. suction side of the compressor

72．The pressure of a liquid leaving the pump can be referred to as the __________.

A. total head

B. discharge head

C. net positive suction head

D. suction head

73．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

74.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 combustion in a diesel engine can be caused by ______.

A. high compression pressure

B. low intake air temperature

C. low exhaust pressure

D. high scavenge air temperature

77.An automated diesel engine should normally shut down due to ______.

A. low lube oil temperature

B. high ambient air temperature

C. low lube oil pressure

D. high exhaust system back pressure

78.To successfully reduce an excessively high diesel engine exhaust gas temperature, you

should ______.

A. reduce the engine driven fuel pump outlet pressure

B. retard the fuel injector timing to reduce power

C. increase the fuel rack setting

D. reduce the load on the engine

79.______, the engine must be stopped immediately.

A. Should knocking occur

B. If knocking occur

C. Should if knocking occurs

D. If occur knocking

80.Lower suction pressure of a pump may be caused by ______.

A. too much air in the pipe line

B. closed inlet valve

C. empty tank

D. leaky

pipe

81.Each journal and pin should be examined for ______and grooving.

A. bridges

B. recesses

C. rears

D. ridging

82. A built-up exhaust valve is one in which ______.

A. the stem and heads are made of different material

B. low-alloy steel is used throughout

C. a replaceable valve disk is welded to the head

D. the self-centering action comes from motion of the valve stem in the guide

https://www.sodocs.net/doc/fd6343545.html,bustion knock can occur in the cylinders of a diesel engine under any condition

permitting ______.

A. a shortened ignition delay period

B. a lean fuel/air mixture

C. excess fuel in the combustion chamber

D. rapid vaporization of injected fuel

droplets

84.The bearing cap and shell are replaced and tightened up until ______.

A. the “ nip ”is zero

B. the “ nap ” is zero

C. the “ gap ”is correct

D. the “ clearance ” is correct

85.The resistance of electric wire will decrease as its ______.

A. length increases

B. cross-sectional area increases

C. temperature increases

D. percent of metallic purities increases

86.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 tanks

fuel tanks

87.Tools with ______handles should be used to check electric circuit.

A. plastic

B. metal

C. stainless steel

D. copper

88.The crankcase cover should not be opened until at least ______minutes after the engine

stops.

A. 10

B. 15

C. 20

D. 30

89.“Movement of engine no longer required.” means “______”.

A. Stop Engine

B. No Engine Revolution

C. Stand-by Engine

D. Finished

With Engine

90.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-parties or below convention size shall be given ______.

A. more favorable treatment

B. less favorable treatment

C. no more favorable treatment

D. the most favorable treatment

91.When starting a reciprocating pump, the discharge valve should be ______.

A. closed

B. opened fully

C. cracked open

D. partly open

92.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 tanks

D. fuel tanks

93.The resistance of electric wire will decrease as its ______.

A. length increases

B. cross-sectional area increases

C. temperature increases

D. percent of metallic purities increases

94.The ______is used to measure power.

A. ammeter

B. voltmeter

C. wattmeter

D. frequency meter

95.The certificate for the refrigerating plant will ______soon. I’d like to extend its validation

now.

A. update

B. finish

C. outdated

D. expire

96.If the buoyant force （浮力）on a ship's hull is equal to or greater than the displacement

tonnage, the ship will ______.

A. require ballast added to only the port side tanks

B. be down by the head

C. sink

D. float

97.The three basic parts of any eductor are the nozzle, the suction chamber, and the

_____________.

A. injector

B. compressor

C. diffuser

D. siphon

98.The fire drill must, as far as practicable, be conducted as if ______.

A. there is a minor emergency

B. there is an actual emergency

C. there were a minor emergency

D. there were an actual emergency

99.To maintain the down stream pressure within defined limits over a range of flow and

despite any changes in supply pressure, ______is fitted.

A. a check valve

B. a gate valve

C. a pressure reducing valve

D. a quick closing valve

100.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-parties or below convention size shall be given ______.

A. more favorable treatment

B. less favorable treatment

C. no more favorable treatment

D. the most favorable treatment

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