单项选择题
If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）
A.insufficient speed
B.cavitation
C.excess discharge pressure
D.excessive net positive suction head B
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相关考题
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单项选择题
The valve which is most suited for regulating the flow through a pipeline is a （）
A.gate valve
B.globe valve
C.swing-check valve
D.plug-cock valve -
单项选择题
Increasing the speed of a centrifugal pump will result in an increase in its capacity in its capacityAnother means of increasing the capacity pump is to increase the（）
A.diameter of the discharge piping, with all other factors remaining the same
B.diameter of the suction piping, with all other factors remaining the same
C.width of the impeller only
D.diameter of the impeller -
单项选择题
Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?（）
A.Oil is discharged from the impeller through the outlet
B.Gravity causes the oil to flow toward the discharge
C.The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts
D.The discharge capacity varies directly with the speed of the impeller
