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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1.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

2.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

4.單項(xiàng)選擇題The amount of fluid delivered by a positive displacement pump can be regulated by ().

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

5.單項(xiàng)選擇題The amount of fluid delivered by a reciprocating pump can be regulated by ().

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

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