單項(xiàng)選擇題Which cause of following will not lead to refrigeration plant short-cycle?（）

A.lack of refrigerant
B.refrigerant with much water
C.set defectively low pressure relay
D.no cooling water


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題

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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題On what do you depend having the air cooler of main engine chemically washed?（）

A.increased air pressure differenced before and aft air cooler
B.reduced exhaust temperature in all cylinders
C.reduced temperature difference between water inlet and outlet
D.both A and C