單項選擇題

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

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單項選擇題

A （） pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.

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

單項選擇題

A reciprocating pump belongs to （） according to its working principle.

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