英译汉：lubrication

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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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• Water lubricated tailshaft bearings wear,（）

  A . the after one is more than forward one B . the forward one is more than after one C . the forward one is the same with after one D . it depends on the type of engine

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• Which of the listed cylinder liner surface conditions indicates proper lubrication?（）

  A . Dull black appearance B . Bright appearance C . Thin layer of lacquer D . Thick oily film

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• During repair,lubrication lines and orifices must be （）.

  A . taken away B . engaged C . connected D . sealed off

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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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• Air line lubricators are used in compressed air systems to lubricate （）.

  A、the suction and discharge valves B、tools and equipment served by compressed air C、air line reducing valves D、all of the above

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• The （） of the lubricant should be sufficient to hold the film together, but it should allow the lubricant to flow easily.

  A . specific gravity B . viscosity C . acid value D . calorific value

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• Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.

  A . cylinder liners and piston rings B . main bearings C . crankpin bearings D . turboblower

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• Wristpin bearings are difficult to lubricate because of their oscillating motion and（）

  A . their free-floating design B . their relatively small size C . the reciprocating motion of the piston D . their position in the lubrication system

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• On small, low pressure, air compressors, the cylinders are usually lubricated by the （）.

  A . splash method B . mechanical force feed lubricators C . detached sump method D . internal cooling passages in the crankshafts and connecting rod

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• （）diesel engines generally have two systems of lubrication:（）a total loss system feeding and a circulating system lubricating the running gear and cooling the pistons.

  A . Large crosshead type；crossheads B . High speed；the cylinders C . Large crosshead type；the cylinders D . Four-stroke；pistons and cylinder

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• The most crucial time for any bearing with regards to lubrication is （）

  A . during low loads B . after proper oil viscosity is reached C . during starting D . after cleaning filter

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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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• The lubricating pipes and dusts should be blown out with （）.

  A . atmosphere B . the fresh water C . compressed air D . chemical compound

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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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• A grease gun is generally used to lubricate a （）.

  A . condensate pump ball bearing B . main shaft bearing C . main turbine bearing D . diesel engine wrist pin bearing

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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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• There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.

  A . recirculating B . total loss C . cooling D . refrigeratio

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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 key functions of lubricants include （).

  A. reduce friction B. carry away contaminants and debris C. prevent corrosion and seal for gases D. all of the above

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