Oil will lubricate these parts （） effectively than water.

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• If the detergent type lubricating oil being used in a diesel engine is black, the oil （）

  A . must be centrifuged B . must by filtered C . must be changed D . is holding finely dispersed carbon in suspensio

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• The removal of （） from lubricating oil will reduce engine wear and possible breakdowns.

  A . contaminating water B . contaminated additives C . contaminated fuel D . contaminating impuritie

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• Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.

  A . overspeed trip B . audible/visual alarm C . the ships/boats general alarm D . reserve oil storage tank

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• In a complete oil/water separator, more oil will separate out onto the underside of these plates and travel outwards until it is free to rise into the oil collecting space Whats the meaning of "it" in the sentence above?（）

  A . a separator B . oil C . water D . an oil collecting space

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• Engine coolant accumulating in the diesel engine lubricating oil can result from a （）

  A . low oil pressure B . high coolant pressure C . leaking fuel injector D . cracked cylinder head or liner

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• The （）pump is usually used as the lubricating oil pump.

  A . turbine B . screw C . vaneejector D . centrifugal

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• In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.

  A . crosshead B . crankpin C . crank journal D . gudgeon pi

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• The amount of lubricating oil in the drain tank should be checked by （）.

  A . measuring B . sounding rod C . metering D . weighting

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• An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to （）

  A . have a high viscosity index B . mix readily with refrigerant C . have a high freezing point D . have a low pour point

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• There will usually be summaries or daily account tables for heavy oil, diesel oil, lubricating oil, and fresh water, which will be compiled（）

  A . at the beginning of every watch B . at the beginning of the first watch every day C . at the completion of every watch D . at noon every day

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• Two main lubricating oil pumps are usual and are obligatory in （）.

  A . container ships B . bulk carriers C . passenger ships D . barge

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• One of function of diesel engine lubricating oil is to （）

  A . induce carbon formation on cylinder walls B . improve fuel penetration in the combustion space C . form a friction reducing film between mating surfaces D . lubricate the fuel injectio

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• There should be a lubricating oil （） between the main beatings and the crankshaft.

  A . film B . cap C . lacquer D . shell

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• Lubricating oil should be changed on a heavy duty diesel engine when（）.

  A . it gets dark in color B . a sample rubbed between fingers feels thin C . it has been in use for a specified interval D . it no longer supports combustio

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• The tendency for lubricating oil to thin out at high temperatures and thicken at low temperatures will be characterized by a （）.

  A . low viscosity index B . high viscosity index C . high neutralization number D . low demulsibility quality

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• One characteristic of a lubricating oil adversely affecting the result of centrifuging is （）

  A . high TBN value B . low oil floc point C . low oil demulsibility D . low oil neutralization number

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• （） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.

  A . Except for B . Beside C . Except D . In addition to

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• Lubricating oil viscosity in an operating diesel engine can be reduced by（）

  A . increasing cooling water flow B . increasing lube oil flow C . dilution by fuel oil D . adding SAE 70 oil

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• Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）

  A . Splash B . Gravity C . Pressure D . Bypa

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• The following options are all the functions of lubricating oil except（）

  A . removing heat and deposits B . neutralizing acidic products C . lubricating D . improving combustion efficiency

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• In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a （） in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.

  A . telescopic pipes B . large bore C . drilled passage D . tied rod

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• When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.

  A . filter to remove the fuel oil B . use the settler to remove the fuel oil C . remove the fuel oil by centrifuging D . drain and then renew the lube oil supply

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• The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil temperatures and pressures （） in much the same way as for the main engine.

  A . to be kept B . logged C . changed D . has remained

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• Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause______.

  A.carbon deposits on the compressor suction valves B.the evaporator temperature to increase C.rapid corrosion of the thermal expansion valve D.no operating problems

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