单项选择题

Auxiliary diesel engines can be automatically shut down as a result of （）

A.low lube oil temperature
B.low lube oil pressure
C.high exhaust temperature
D.high cooling water pressure

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单项选择题

Which of the listed conditions can cause a diesel engine to use too much lube oil?（）

A.Dirty lube oil filter
B.Too much piston ring wear
C.High lube oil viscosity
D.Low lube oil temperature

单项选择题

Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）

A.The oil oxidizes and forms carbon deposits
B.The viscosity increases
C.Engine oil consumption decreases
D.Lubricating qualities of the oil are enhanced

单项选择题

The oxidation by-products forming in diesel engine lube oil can cause （）

A.pitting
B.sludge
C.hard varnish
D.all of the above