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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1.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

2.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

3.單項選擇題The most common instrument used to measure diesel engine exhaust pressure is the （）

A.pyrometer
B.bourdon gauge
C.pneumercator
D.manometer

4.單項選擇題A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）

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

5.單項選擇題One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）

A.crankcase
B.piston
C.cylinder liner
D.crank cheek