单项选择题

Reduced capacity, accompanied by vibration and noise at the suction of a centrifugal pump is a result of （）.

A.cavitation
B.water hammer
C.fluid friction
D.steam knock

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单项选择题

A.sub-cooled liquid
B.high temperature liquid
C.oil saturated liquid
D.superheated vapor

单项选择题

A.Reciprocating
B.Centrifugal
C.Rotary
D.Gear

单项选择题

A.change in the impeller diameter
B.square of the impeller radius
C.cube of the impeller diameter
D.impeller efficiency for large changes in its size