单项选择题

In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.

A.produce a scavenging effect in the combustion space
B.equalize cylinder and exhaust manifold pressures
C.alleviate the difference in valve size between the intake and exhaust
D.flush out condensate that collects after each compression stroke

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单项选择题

Early injection timing is indicated by （）.

A.high exhaust temperature and low firing pressure
B.high exhaust temperature and high firing pressure
C.low exhaust temperature and low firing pressure
D.low exhaust temperature and high firing pressure

单项选择题

A faulty injection in one cylinder of an operating diesel engine can be located by （）

A.cutting out individual injectors and noting engine performance
B.checking lube oil temperature
C.checking cam position
D.using a timing light

单项选择题

What harmful condition can result if a diesel engine is operated at very light loads for long periods of time?（）

A.increased carbon buildup
B.burning of intake valves
C.excessive firing pressures
D.increased fuel consumption