單項選擇題Bearing knocks are likely to occur from （）.

A.less clearance
B.dirty lube oil
C.overload
D.bearing wear


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1.單項選擇題Be sure to make the engine turn by （） before starting and after stopping .

A.steering gear
B.turning gear
C.steering wheel
D.turning cycle

2.單項選擇題At the top of the A-frames there is a strong cast iron frame called （）.

A.cylinder liner
B.cylinder cover
C.the gear box
D.the scavenging box

4.單項選擇題As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.

A.being compressed
B.to be pumped up
C.is pressurized
D.are built up

5.單項選擇題As for a diesel engine, lack of combustion air may be due to （）.

A.fouling turbine
B.fuel pump faults
C.lubrication failure
D.excessive cooling