单项选择题

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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单项选择题

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)

单项选择题

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

单项选择题

When an auxiliary boiler is panting and emitting black smoke, you should （）.

A.increase the fuel oil temperature
B.decrease the fuel oil temperature
C.decrease the fuel oil supply pressure
D.increase the air supply