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單項(xiàng)選擇題

Throttling in the （） line of a centrifugal pump involves the risk of the pump cavitation.

A.suction
B.exhaust
C.pressure
D.discharge

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單項(xiàng)選擇題

A positive displacement pump is that where the volume of the pump chamber is alternately increased to （） and then decreased to （）.

A.draw the liquid in；force the liquid out
B.force the liquid out；draw the liquid in
C.suction；draw
D.deliver；outlet

單項(xiàng)選擇題

The amount of fluid delivered by a helical pump can be regulated by （）.

A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree