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单选题
A multistage centrifugal pump can be BEST described as having （）.
A
two or more impellers housed together in one casing and mounted on a single shaft
B
a single stepped impeller mounted in a progressively staged casing
C
a large radial clearance between the impeller and casing to prevent overheating due to
D
an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages
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更多 “单选题A multistage centrifugal pump can be BEST described as having （）.A two or more impellers housed together in one casing and mounted on a single shaftB a single stepped impeller mounted in a progressively staged casingC a large radial clearance between the impeller and casing to prevent overheating due toD an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages” 相关考题
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Single stage or multistageB
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width of the impeller onlyD
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单选题All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.A
set the relief valveB
check the lubrication systemC
vent the pump casingD
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increase speedB
increase the size of the cardent assemblyC
reduce wearing ring clearancesD
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excessive pump speedB
excessive suction headC
worn wearing ringsD
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单选题The purpose of the wearing rings used in a centrifugal pump is to （）.A
prevent an internal explosion in the pump when it is overheatedB
enable a visual inspection of the pump while it is runningC
insure a proper alignment of the pump coupling to the driverD
accommodate for friction between the impeller and the easing
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a reciprocating pumpB
a vane pumpC
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The pump delivers full capacity when started, but gradually slackens off toan abnormally low flowB
The pump packing gland overheats after short operating periodsC
The motor over-current protective device continually shuts the pump downD
Pounding noises can be heard at the pump suction chest
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centrifugal pump is cheaper than reciprocating pumpB
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centrifugal pump makes maintenance easier than reciprocating pump doesD
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priming waterB
power supplyC
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bearing lubrication
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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
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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
They increase the strength of the shaft
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