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

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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 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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• 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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• In an oil cooler circulated by sea water, the oil is at a larger pressure the result being that any leak in the cooler will mean a loss of （）.

  A . oil B . sea water C . refrigerant D . fresh water

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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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• 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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• Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.

  A . wax precipitation in the lube oil B . contamination by dust, scale, or moisture C . refrigerant bubbles in the lube oil D . refrigerant reducing the lube oil viscosity

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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 amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.

  A . specific gravity B . viscosity C . S E number D . hydrolytic stability

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• With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to （）.

  A . allow filtration of less viscous oil B . decrease the pressure drop across the filter C . improve overall filtration D . all of the above

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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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• The pour point of lubricating oils is affected the most by which of the following?（）

  A . Extensive centrifuging B . Wax content C . Water content D . Acid content

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• The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.

  A . play a great part on B . run a role in C . plays an important part in D . acts as important part at

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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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• 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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• In a diesel engine lube oil system, which of the following parts should be lubricated first?（）

  A . Camshaft beatings B . Main bearings C . Piston crowns D . Cylinder wall

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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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• Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.

  A . the cylinder cover B . the piston rings C . the piston crown D . the piston skirt

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• （） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.

  A . Too larger B . Too smaller C . Excess D . Excessive

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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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• 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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