單項(xiàng)選擇題The pump discharge pressure will be considerably higher than the pressure at the ().

A.pump entry branch
B.outlet pipe
C.impeller
D.None of the above is true


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1.單項(xiàng)選擇題What is the purpose of a relief valve?()

A.to fill 2 tanks at the same time
B.to use pump at a higher pressure
C.to return liquid to suction side if discharge valve is closed
D.All of the above are true

3.單項(xiàng)選擇題A reciprocating pump belongs to () according to its working principle.

A.injector pumps
B.positive displacement pumps
C.centrifugal pump
D.centripetal pumps

4.單項(xiàng)選擇題Shaft sealing in a centrifugal pump can be effected by ().

A.the mechanical seal
B.packed stuffing boxes
C.either A or B
D.neither A nor B