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单选题
The pressure head of a water pump is given in the unit of （）.
A
kg
B
MPa
C
mH20
D
None of the above
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单选题（） provides the head or pressure to supply the domestic water where required.A
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单选题A centrifugal bilge pump requires priming （）.A
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due to the inability of this type of pump to lift water to cover the suction (eye) of the impellerC
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in order to overcome the potential energy of water in the discharge line
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单选题In a domestic fresh water system, the pump starters are controlled by （） switches which operate when the pressure in the tank varies within predetermined limits as water is drawn off.A
water levelB
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a level controllerB
a temperature switchC
a pressure switchD
a floating ball
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单选题Oil pressure in the lubrication system is（）than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.A
higherB
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the filter is cloggedB
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screw pump is worn seriously and volumetric efficiency is decreased
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单选题Which of the following terms is used to identify the pressure of the liquid entering a pump?（）A
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单选题The outlet from an expansion tank of a closed freshwater cooling system should be piped to the （）.A
cylinder head water outlet headerB
cylinder jacket inlet mainC
heat exchanger inlet connectionD
jacket water pump suction line
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jacket water outletB
expansion tank inletC
heat exchanger inletD
cooling water pump outlet
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单选题（）is used in typical marine pattern self-contained unit.A
a water cooled condenserB
a slop tankC
a expansion tankD
a centrifugal pump
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excessive water in the bilgesB
a clogged suction strainerC
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单选题The static suction head of is the （）A
distance of the suction liquid level above the line of the pumpB
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force necessary to overcome frictional losses in the pump and pipingD
amount in inches of mercury the total suction head is below atmospheric pressure
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单选题If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.A
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abnormally high feed water temperatureC
abnormally high boiler water temperatureD
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考题
单选题Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?（）A
Correct the cause of the scoring and repair the sleeve or replace with a new oneB
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单选题The pressure head of a pump is given in the unit of （）.A
kgB
MPaC
meter fluid columnD
None of the above is true
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mechanical energyB
heat energyC
potential energyD
kinetic head
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