When separating lube oil separator, the optimal separating quantity is（）of the rated quantity on name plate.

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• Oil water separators are used to ensure that ships don’t discharge oil when （） bilge water.

  A . to pump off B . being pumped C . pumping out D . it pumping out

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• Although lube oils used in the main lubricating service systems should have a relatively high flash point to avoid ignition, they can create smoke and fire hazards when they （）.

  A . are exposed to a vacuum B . come in contact with extremely hot surfaces C . are reduced in temperature to just above the pour point D . become extremely agitated or aerated

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

  A . under high pressure B . under low pressure C . heated to reduce viscosity D . cooled to increase viscosity

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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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• 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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• When finish work on the oil separator, you should（）firstly.

  A . cut off the power B . cut off the oil inlet C . open guide water valve D . close oil outlet value

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• When two oil separators are working in series, they should work with （）

  A . both as clarifiers B . first one as clarifiers, second one as purifier C . both as purifiers D . first one as purifier, second one as clarifier

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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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• 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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• 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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