单项选择题

A four-stroke/cycle, 1000horsepower diesel engine fails to start at normal cranking speed with normal fuel pressure and ambient temperatureThe reason for the failure could be（）

A.glazed liners or pistons
B.high lube oil pressure
C.excessive compression ratio
D.worn valve seats and valves

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单项选择题

In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）

A.governor droop
B.speeder spring tension
C.fuel rack lag
D.load on the engine

单项选择题

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

单项选择题

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