单项选择题

An overcorrecting and unstable engine governor operation is known as（）.

A.droop
B.dead banding
C.dash potting
D.hunting

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单项选择题

Coolant can be lost from a diesel engine jacket cooling waster system by leakage from（）

A.cylinder head cracks
B.piping joints
C.pump leaking
D.all of the above

单项选择题

Ring groove inserts are occasionally used on aluminum alloy piston to（）

A.reduce the ring groove wear rate
B.seal against crankcase vapors
C.lessen the wear on aluminum part of the cylinder
D.allow for the greater expansion rate of aluminum

单项选择题

A sudden drop in diesel engine cylinder compression pressure can be caused by（）

A.a leaking fuel injector nozzle
B.a clogged air filter
C.excessively early fuel injection
D.malfunctioning valves