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單項選擇題

Worn main bearings in a diesel engine can result in （）

A.decreased compression pressure
B.increased lube oil pressure
C.lower lube oil temperature
D.excessive leakage past the piston rings

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單項選擇題

When monitoring diesel engine performance, the most useful instrument to use is the （）

A.dwell-tachometer
B.exhaust gas pyrometer
C.fuel flow rate mete
D.exhaust gas analyzer

單項選擇題

Low compression in a diesel engine could be caused by（）

A.worn or broken cylinder liner sealing rings
B.high cooling water temperature
C.worn or broken piston rings
D.low fuel oil pressure