单项选择题

On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）

A.centrifugal pump is cheaper than reciprocating pump
B.the size of centrifugal pump with same capacity is smaller than that of reciprocating pump
C.centrifugal pump makes maintenance easier than reciprocating pump does
D.all of the above

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单项选择题

When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will（）

A.rise quickly
B.rise slowly
C.drop quickly
D.drop slowly

单项选择题

Continuous surging of turbocharger can be caused by（）
①crash stop of engine
②increased back pressure after T-Ch
③fouled or damaged turbine nozzle ring

A.all are correct
B.②and③are correct
C.none of the above is correct
D.①only is correct

单项选择题

When occurring a fire in the scavenge air box, the following measures should be taken except for（）

A.reducing speed to SLOW and asking bridge for permission to stop
B.stopping the fuel oil supply
C.switching-on the auxiliary blowers
D.putting the scavenge air box fire extinguishing equipment into function