Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.

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• Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.

  A、using a slightly dirty air filter B、using oil having an excessive viscosity C、intercooler or after-cooler leaks D、carrying the oil level higher than normal

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• Which harmful consequence may be the result of lube oil sludge accumulation? （）

  A . Clogged oil pump suction screens B . Increased oil operating temperatures C . Sticking piston rings D . All of the above

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• Lube oil pumps taking suction from the sump of most small marine engines are usually （）.

  A . of the diaphragm type B . of the centrifugal type C . of the positive displacement type D . independently driven by electric motor

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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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• When fuel oil is accidentally missed with lube oil which of the following processes can be used to separate them?（） Ⅰ.filtering Ⅱ.settling

  A . Ⅰ only B . Ⅱ only C . either Ⅰ or Ⅱ D . neither Ⅰ or Ⅱ

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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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• The pressure difference before and after the lube oil filter indicates （）the filter should be cleaned.

  A . when B . how C . where D . whether

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• If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）

  A . changed B . centrifuged C . filtered D . settled

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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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• 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 lube oil sample taken from the main engine lube oil system has dark yellow opaque color.This is the result of （）

  A . water contamination B . mixing oils of two widely different viscosities C . overheating D . aeratio

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• Excessive lube oil consumption can result from worn or broken（）

  A . piston rings B . valve guides C . valve seals D . all of the above

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• A dirty fuel oil filter is can be detected by （） Ⅰ.fuel oil analysis Ⅱ.observing the pressure drop across the filter

  A . Ⅰonly B . Ⅱonly C . eitherⅠorⅡ D . neitherⅠnor

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• Lube oil cannot be efficiently filtered if its （）.

  A . viscosity is too low B . temperature is too low C . pump discharge pressure is higher than the systems pressure D . pump capacity is greater than the systems need

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• Main propulsion engine lube oil sumps should be constructed （）

  A . so as to never be integral lube B . with a sloped bottom C . only of nonferrous, noncorrosive metals D . with drain/return lines terminating just above or at the designed normal level

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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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• 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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• 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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• When separating the lube oil without additive, it is usually cleaned with hot water; the aim is to remove （） from it.

  A . acid B . sludge C . mechanical impurity D . salinity

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• A condition that can increase the foaming tendency of lube oil is （）

  A . excessively high oil temperatures B . water or moisture contamination C . fuel dilution D . life its cylinder relief vale

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• If a used lube oil analysis indicates an excessive chromate content, this means （）

  A . air filtration is inadequate B . engine coolant leaking into the lube oil C . fuel oil is leaking into the lube oil D . the piston rings are excessively wor

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• Waste oil from the lube oil sumps of machinery may NOT be （）.

  A . drained into the vessels bilges B . reclaimed for other uses C . held in a slop tank D . purified and then reused

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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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