單項選擇題

The camshaft on a four-stroke/cycle diesel engine provides a means to operate the （）.

A.fuel injectors
B.exhaust valves
C.intake valves
D.all of the above

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單項選擇題

A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （）
(1) scavenging air is cooling the exhaust gases
(2) exhaust cycle time is longer

A.(1) only
B.(2) only
C.both (1) and (2)
D.neither (1) nor (2)

單項選擇題

If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutralization number, the （）.

A.acidity has increased
B.viscosity has decreased
C.demulsibility has improved
D.foaming is guaranteed to occur