单项选择题

The volute pump is one in which the impeller （）.

A.discharges into a gradually widening channel
B.has stationary diffuser vanes
C.produces no kinetic energy
D.All of the above are true

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单项选择题

Which of the following pumps belongs to centrifugal pump?（）

A.Piston pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump

单项选择题

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

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