二、根据材料,回答下题:
第5题:
请帮忙给出正确答案和分析,谢谢!
第1题
A.discharge side of the centrifugal pump
B.suction side of the centrifugal pump
C.the lowest point of the cooling water system
D.inlet of the main engine
第2题
A centrifugal pump can’t supply water after startingYou should check ____.
A.priming water
B.power supply
C.packing gland
D.bearing lubrication
第3题
A.high steam pressure in the boiler
B.abnormally high feed-water temperature
C.abnormally high boiler water temperature
D.steam demand exceeding feed pump capacity
第4题
When starting a centrifugal pump, the discharge valve should be ____.
A.closed
B.opened fully
C.cracked open
D.partly open
第5题
A.a reciprocating pump
B.a vane pump
C.a centrifugal pump
D.a triple screw pump
第6题
A centrifugal bilge pump requires priming _____.
A.primarily to lubricate the shaft seals
B.due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller
C.to initially unload the pump by having its head pressure equal to discharge pressure
D.in order to overcome the potential energy of water in the discharge line
第7题
If a centrifugal pump vibrates and is noisy when operating, the cause could be _____.
A.worn gland sealing shaft
B.worn wearing rings
C.a bent shaft
D.reversed pump coupling
第8题
One of the main functions of wearing rings, as used in a centrifugal pump, is to _____.
A.maintain radial alignment between the pump impeller and casing
B.absorb all impeller shaft end thrust
C.prevent water leakage to the atmosphere
D.prevent wear of the pump casing and/or impeller
第9题
The purpose of the wearing rings used in a centrifugal pump is to _____.
A.prevent an internal explosion in the pump when it is overheated
B.enable a visual inspection of the pump while it is running
C.insure a proper alignment of the pump coupling to the driver
D.accommodate for friction between the impeller and the easing
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