A、A.change in impeller diameter
B、B.square of the impeller diameter
C、C.cube of the impeller diameter
D、D.impeller efficiency for large changes in the size of the impeller
更多“The discharge head of a centrifugal pump will vary directly with the （）.”相关的问题
A、Suction head B、Pump head C、Discharge head D、Total head
A、Length of the discharge pipe B、Height of the discharge pipe C、Difference between the discharge and suction pressures D、Sum of discharge and suction pressures
A、the discharge valve is open B、the control box glass is broken C、pressure from the control cylinders is detected D、the control cylinders have been completely discharged
A、between the suction and discharge B、below the liquid supply C、above the liquid supply D、any of the above
A、A.primarily to lubricate the shaft seals B、B.due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller C、C.to initially unload the pump by having its head pressure equal to discharge pressure D、D.in order to overcome the potential energy of water in the discharge line
A、insufficient speed B、cavitation C、excess discharge pressure D、excessive net positive suction head B
A、At the head of the tow B、75m from the head of the tow C、120m from the head of the tow D、180m from the head of the tow
A、have a greater head capacity B、operate with increased impeller efficiency C、discharge through the suction side of the pump casing D、require more power to run the shaft
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