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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相关考题
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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
