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

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• A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.

  A . temperature of the exhaust gases B . energy supplied to the turbocharger C . air pressure to the intake manifold D . purge of exhausted gases from the cylinder

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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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• A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）

  A . ignition lag B . engine horsepower C . lube oil system pressure D . specific fuel consumptio

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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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• Worn main bearings in a diesel engine can result in （）

  A . decreased compression pressure B . increased lube oil pressure C . lower lube oil temperature D . excessive leakage past the piston ring

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

  A . the water produced during combustion B . the sulfur in the fuel C . unburned fuel oil 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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• A diesel engine is supercharged in order to（）

  A . lower the no-load RPMs B . provide more air for combine with the fuel C . increase the no-load RPMs D . provide more fuel combine with the air

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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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• 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 restricted air intake to a diesel engine may result in the engine （）.

  A . failing to reach rated speed B . knocking under maximum load C . hunting or surging under light load D . overspeeding and running away

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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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• In a diesel engine, blow-by（）

  A . increase exhaust back pressure B . causes excessive crankcase pressure C . can only be detected by a compression check D . decreases fuel consumptio

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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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