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单选题
The function of a lubricating oil is （） to lubricate the running surface （） to carry away a great deal of heat.
A
not；but
B
neither；nor
C
either；or
D
not only；but also
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单选题An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to （）A
have a high viscosity indexB
mix readily with refrigerantC
have a high freezing pointD
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high TBN valueB
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单选题Excessive lubricating oil consumption in a running diesel engine can be caused by （）A
clogged lube oil pipingB
excessive valve-guide clearanceC
high lube oil viscosityD
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单选题The amount of lubricating oil in the drain tank should be checked by （）.A
measuringB
sounding rodC
meteringD
weighting
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单选题Which of the following will be the function of lubricating oil used in marine engines?（）A
to remove heat from oil cooled pistonsB
to wash away wear detritusC
to neutralize acidic productsD
all of the above
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单选题（） is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a storage tank.A
A filterB
A centrifugeC
A distillerD
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单选题When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.A
filter to remove the fuel oilB
use the settler to remove the fuel oilC
remove the fuel oil by centrifugingD
drain and then renew the lube oil supply
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单选题Two main lubricating oil pumps are usual and are obligatory in （）.A
container shipsB
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passenger shipsD
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单选题What is one effect of running a diesel engine at too cool a temperature? （）A
Buildup of sludge in the lubricating systemB
Excessive fuel consumptionC
Severe heat stresses on mechanical partsD
Foaming of the lubricating oil
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单选题The （）should be kept running for about half an hour after FWE.A
crankcase lubricating oil pumpB
fuel oil pumpC
air compressorD
auxiliary blower
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sliding piston ringsB
engines camshaftC
small pumpsD
forced feed system
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单选题Engine coolant accumulating in the diesel engine lubricating oil can result from a （）A
low oil pressureB
high coolant pressureC
leaking fuel injectorD
cracked cylinder head or liner
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metal particles loosened by wearB
air when no air cleaners are usedC
condensation of water vaporsD
breakdown of the lubricating oil by dilution
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Except forB
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ExceptD
In addition to
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单选题If the analysis of used lube oil indicates a high content of iron particles, this could indicate（）A
corrosive deterioration of a bearingB
inadequate air filtrationC
excessive ring and liner wearD
excessive cooling of lubricating oil
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单选题The function of lubricating oil is to （）A
maintain even distribution of bearing wearB
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remove entrained water
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increasing cooling water flowB
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单选题The function of lubricating oil is to （）.A
reduce friction between moving surfacesB
provide even distribution of bearing wearC
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单选题One of function of diesel engine lubricating oil is to （）A
induce carbon formation on cylinder wallsB
improve fuel penetration in the combustion spaceC
form a friction reducing film between mating surfacesD
lubricate the fuel injection
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单选题Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）A
SplashB
GravityC
PressureD
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考题
单选题The （）pump is usually used as the lubricating oil pump.A
turbineB
screwC
vaneejectorD
centrifugal
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