Discussion
Which one of the following is a WRONG statement?
Answer: B
The WRONG statement is that the net positive suction head should be more than the theoretical atmospheric pressure.
Cavitation is avoided when the available NPSH exceeds the NPSH required by the pump, a value given by the manufacturer and usually a few metres. It has nothing to do with exceeding atmospheric pressure (about 10.3 m of water); with a suction lift the available NPSH is always less than atmospheric head.
The other statements are correct: the head at zero flow is the shutoff head; by the affinity laws head varies as speed squared; and turbine (deep-well) pumps are multistage centrifugal pumps, so they behave more like centrifugal than propeller pumps.
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