单项选择题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.单项选择题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.单项选择题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.单项选择题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.单项选择题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

6.单项选择题Once a fire is detected the engine should be slowed downOn no account ().

A.the trunking should be opened up
B.should the trunking be opened up
C.the trunking should not be opened up
D.should the trunking not be opened up

7.单项选择题On top of scavenging air box is mounted a strong cast iron frame for each cylinder known as()

A.cooling jacket
B.cylinder liner
C.piston crown
D.cylinder cover

9.单项选择题On opposite ends of a single shaft of a turboblower are a gas driven ()and a air compressor, which are sealed each other.

A.charge air receiver
B.scavenging air belt
C.turbine
D.air cooler