單項選擇題Persistent knocking in one cylinder of a diesel engine could be caused by().

A.a low load on that cylinder
B.sluggish piston ring action
C.excessive piston crown cooling
D.excessive clearance of piston pin


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1.單項選擇題Operating conditions in the crank chamber are very () those in the cylinder.

A.the same as
B.similar to
C.separated from
D.different from

2.單項選擇題Opening of the cylinder () will admit compressed air into the cylinder.

A.safety valve
B.indicator cock
C.blow-down valve
D.start valve

3.單項選擇題Once all cylinders are firing regularly, () is shut off.

A.the exhaust valve
B.the starting air
C.the inlet valve
D.the fuel oil

5.單項選擇題Once a scavenge fire is detected the engine ().

A.will be speeded up
B.should be slowed down
C.must slow down
D.have to be slow down