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单选题
A centrifugal pump can’t supply water after startingYou should check （）.
A
priming water
B
power supply
C
packing gland
D
bearing lubrication
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单选题A centrifugal bilge pump requires priming （）.A
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increase speedB
increase the size of the cardent assemblyC
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单选题If you were operating a centrifugal water service pump with worn wearing rings, the （）.A
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单选题（）is used in typical marine pattern self-contained unit.A
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单选题After stopping oily water separator, sea water should be permitted for （） minutes,（）should be closed after stopping pump to reduce oxidation corrosion of inner wall.A
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15；inlet and outlet valueC
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volute must impart a radial and rotary motion of the water suction sideC
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考题
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increasing water supply flowC
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考题
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考题
单选题Which of the listed conditions can lead to cavitation气穴in a centrifugal pump?（）A
Vapor pockets formed in the suction flow streamB
Rough easing volute surfacesC
Worn wearing ringsD
Heavy fluid in the flow stream
考题
单选题Why are removable sleeves installed on centrifugal pump shafts?（）A
They make it easier to replace the pump shaft packingB
They can be economically replaced as they wear outC
They can be removed when it is necessary to lighten the weight of the pumpD
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