Diesel engine lube oil can become contaminated as a result（）

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• Dirt in the fuel oil system of a diesel engine can cause （）.

  A . clogged filters B . poor combustion C . overloading of the diesel D . shock of fuel line

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• If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）

  A . a dirty lube oil strainer B . internal water leaks C . an oil suction line restriction D . excessive wears of the cooling water pum

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• Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）

  A . Low viscosity index B . Low carbon forming tendencies C . High film strength D . High non-corrosive qualitie

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• Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）

  A . an increased flash point B . higher lube oil pressures C . an increased viscosity D . lower lube oil pressure

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• For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.

  A . a gravity tank B . a sump C . a vessel D . a bottle

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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 oxidation by-products forming in diesel engine lube oil can cause （）

  A . pitting B . sludge C . hard varnish D . all of the above

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• Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.

  A . open the bypass line B . cut in the lube oil cooler C . pressurize the lube oil system D . top off the expansion tank

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• Leaking oil seals on a diesel engine turbocharger can cause（）

  A . the engine to run after the fuel has been secured B . the engine to over-speed C . a fire D . all of the above

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• High lube oil temperatures developing in a diesel engine can result from（）

  A . high oil pressure B . excessive bearing end play C . plugged oil control rings D . engine overload

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• Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）

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

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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 temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.

  A . 8-10℃ B . 10-12℃ C . 10-15℃ D . 10-20℃

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• A four-stroke cycle, turbocharged, 1000 horsepower diesel engine has been operating under loadThe load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperatureIn response to this condition, you should:（）

  A . reduce load B . check your exhaust C . adjust cooling water temperature D . increase lube oil flow

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• Clogged diesel engine fuel oil filters can cause（）

  A . loss of power B . misfiring C . low fuel oil pressure D . All of the above

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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 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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• 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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• A dirty diesel engine oil filter element can best be detected by （）.

  A . visual inspection of the elements B . the pressure drop across the filter C . high lube oil sump temperature D . decrease in oil viscosity from the filter

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• The pressure differential across a diesel engine lube oil system duplex filter should be checked to （）

  A . determine the need for filter cleaning B . measure any change in oil viscosity C . prevent damage to the filter D . determine the need for batch filtratio

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• Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）

  A . decrease the time required between cleanings B . removes all large and small foreign objects C . ensure a positive flow of oil at all times D . ensure that all lube oil has been treated twice

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• The Total Base Number (TBN) value of diesel engine lube oil refers to its ability to （）

  A . resist changes in viscosity with changes in temperature B . resist emulsification C . neutralize acids D . resist oxidation at high temperature

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• Which of the following conditions could be a cause of excessive fuel dilution of diesel engine lube oil?（）

  A . Leaking fuel injectors B . Lower than normal compression C . Delayed fuel injection D . All of the above are correct

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• Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil？ .

  A.Water discharging from the water outlet of the lube oil purifier B.Fuel oil discharging from the water outlet of the lube oil purifier C.Lube oil discharging from the water outlet of the lube oil purifier D.A change in the lube oil viscosity

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