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

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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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• 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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• Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they （）.

  A . are exposed to a vacuum B . come in contact with extremely hot surfaces C . are reduced in temperature to just above the pour point D . become extremely agitated or aerated

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• What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）

  A . White B . Black C . Blue D . Clear

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• The main function of the lubrication system in to enable （） of a film of oil between the moving parts.

  A . the information B . the formation C . the scatter D . the frictio

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• Large crosshead type engine generally has two lubrication systems, a function performed only by cylinder oil system is（）

  A . lubricating B . cooling C . sealing D . cleaning

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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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• On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.

  A . a spindle lubricator B . an oil jet C . internal splashing D . drilled passages in the crankshaft

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• In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.

  A . metal particles loosened by wear B . air when no air cleaners are used C . condensation of water vapors D . breakdown of the lubricating oil by dilutio

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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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• 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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• Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）

  A . filtering B . centrifuging C . depositing D . operating

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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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• Large crosshead type engine generally has two lubrication systems, a function performed only by crankcase oil system is（）

  A . lubricating B . cooling C . cleaning D . neutralizing

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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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• On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.

  A、banjo feed B、splash feed C、gravity feed D、pressure feed

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• Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）

  A、a circulating system; a total loss system B、a total loss system; a circulating system C、an opened system; a closed system D、a closed system; an opened system

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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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• Oil will lubricate these parts （） effectively than water.

  A . much B . more C . most D . le

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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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• On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so ______ that the temperature of the piston cooling oil returns are 32 to 35℃ over a period of at least two hours.

  A.slow B.quick C.arranged D.high

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