單項(xiàng)選擇題Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）

A.Flash point improvers
B.Pour point improvers
C.Inhibitors
D.Foam suppressors


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1.單項(xiàng)選擇題Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）

A.Low viscosity index
B.Low carbon forming tendencies
C.High film strength
D.High non-corrosive qualities

2.單項(xiàng)選擇題A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with （）

A.a high viscosity index
B.a low viscosity index
C.neutralize acids
D.resist oxidation at high temperatures

3.單項(xiàng)選擇題The Total Base Number (TBN) value of diesel engine lube oil refers to its ability to （）

A.resist changes in viscosity with changes in temperature
B.resist emulsification
C.neutralize acids
D.resist oxidation at high temperatures

4.單項(xiàng)選擇題One characteristic of a lubricating oil adversely affecting the result of centrifuging is （）

A.high TBN value
B.low oil floc point
C.low oil demulsibility
D.low oil neutralization number

5.單項(xiàng)選擇題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 worn