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单选题
Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil（）.
A
TBN number
B
viscosity
C
temperature
D
foaming
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单选题What function is provided by the crankcase ventilation system on some diesel engines?（）A
Increases the sludge forming tendency of lube oilB
Prevents the accumulation of combustible gasesC
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单选题It is necessary for us （） after having served for a certain period.A
to change the lube oilB
have the lube oil purifiedC
have the lube oil burntD
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单选题Demulsibility of a lube oil is defined as （）.A
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考题
单选题Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.A
wax precipitation in the lube oilB
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考题
单选题If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）A
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单选题While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）A
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单选题Which harmful consequence may be the result of lube oil sludge accumulation? （）A
Clogged oil pump suction screensB
Increased oil operating temperaturesC
Sticking piston ringsD
All of the above
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