单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

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