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

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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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• The degree to which the viscosity of an oil will change with a change in temperature is indicated by the （）.

  A . weight designation B . viscosity index C . pour point D . thermal change value

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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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• The viscosity regulator controls the fuel oil temperature （） provide oil at the correct viscosity for combustion.

  A . in order that B . because of C . in order to D . owing to

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• Which of the following statements is correct regarding an oil with a high viscosity index?（）

  A . A large change of viscosity occurs with a minor change in temperature B . No change in viscosity occurs with any change in temperature C . Very little change in viscosity occurs with a significant change in temperature D . The viscosity of the oil increases with an increase in temperature

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• When centrifuging heavy fuel oil, an important factor to consider is the （） (1) flow rate (2) viscosity of the fuel oil

  A . (1) only is correct B . (2) only is correct C . both (1) and (2) are correct D . neither (1) or (2) are correct

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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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• 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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• Which of the following statements is correct concerning the viscosity of lubricating oil?（）

  A . Viscosity will increase as temperature increases B . Viscosity is a measure of a fluid s internal resistance to flow C . Viscosity will decrease as temperature decreases D . Viscosity is not dependent on temperature

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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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• A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）

  A . loss of additives from the lube oil B . carbon deposits in the lube oil C . excessive centrifuging D . excessive fuel dilutio

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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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• 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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• To assist separation of low viscosity oils steam coils or electric heaters are fitted （） of the oily water separator.

  A . in entrance B . in exit C . in the upper part D . on the outside

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• Temperature affects the viscosity of oil.（)

  是 否

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