單項選擇題

If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）

A.insufficient speed
B.cavitation
C.excess discharge pressure
D.excessive net positive suction head B

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單項選擇題

The valve which is most suited for regulating the flow through a pipeline is a （）

A.gate valve
B.globe valve
C.swing-check valve
D.plug-cock valve

單項選擇題

Increasing the speed of a centrifugal pump will result in an increase in its capacity in its capacityAnother means of increasing the capacity pump is to increase the（）

A.diameter of the discharge piping, with all other factors remaining the same
B.diameter of the suction piping, with all other factors remaining the same
C.width of the impeller only
D.diameter of the impeller