單項(xiàng)選擇題If you notice smoke coming fro the crankcase exhaust fan outlet of an operating diesel engine, you would suspect（）

A.a cracked cylinder liner
B.clogged intake ports
C.broken piston rings
D.a faulty head gasket


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1.單項(xiàng)選擇題When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）

A.increase the starting air pressure
B.use a higher than normal cranking speed
C.increase the fuel injection pressure
D.use a fuel having a lower ignition temperature

2.單項(xiàng)選擇題Water accumulation in the cylinder of a secured engine is an indication that the （）

A.soft water pump was not secured along with the engine
B.jacket water thermostat has failed
C.cylinder liner may be cracked
D.raw water pump is over-speeding just prior to engine shutdown

3.單項(xiàng)選擇題If a diesel engine turned over at normal cranking speed but failed to start, the cause could be late fuel injection or （）

A.excessive fuel pressure
B.high lube oil viscosity
C.inadequate fuel injection
D.excessive starting air pressure

4.單項(xiàng)選擇題A bronze bearing liner with a lead-tin flashing has a milky-white color over most of its surface and some areas of exposed bronze, the white coloring indicates（）

A.proper break-in wear
B.improper break-in wear
C.relocation of the overlay flashing
D.water contamination of the lube oil system

5.單項(xiàng)選擇題If a diesel engine turned over freely but failed to start, the cause could be （）

A.water in the fuel
B.cold lube oil
C.excessive starting air pressure
D.excessive fuel pressure