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

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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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• To receive oil residues from the purification of fuel and lubricating oils in the machinery spaces, what kind of tank(s) should be provided on board?（）

  A、bilge tank B、sludge tank . C、overflow tank D、oil collecting tank

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• 英译汉：lubrication

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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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• Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.

  A、main bearings B、connecting rod bearings C、piston pin bushings D、all of the above

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  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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  A . camshaft beatings B . main bearings C . piston crowns D . cylinder wall

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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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• （）provides strength and strong space for fule,lubricating oil,fresh water,salt(ballast)water and potable water.

  A . The double bottom B . The cofferdam C . The navigating bridge D . The superstructure

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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 （）

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

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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?（）

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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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