单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
A reciprocating pump belongs to （） according to its working principle.
A.injector pumps
B.positive displacement pumps
C.centrifugal pump
D.centripetal pumps -
单项选择题
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
