单项选择题

Excessive lube oil consumption can result from worn or broken（）

A.piston rings
B.valve guides
C.valve seals
D.all of the above

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单项选择题

In an operating diesel engine, pre-ignition can be caused by （）

A.excessively late fuel injection
B.oil in the air charge
C.water in the fuel
D.injection continuing after the fuel charge is ignited

单项选择题

One cause of diesel engine surging can be a result of （）

A.injection pump plungers stuck or worn
B.low compression
C.solenoid stuck open
D.fuel tank too full

单项选择题

Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）

A.facilitate bi-directional operation
B.provide the greatest pump efficiency
C.prevent pump clogging from marine growth
D.prevent cavitation at the pump outlet