Net positive suction head (NPSH) of a centrifugal pump must be____________________?
Correct answer: A. Greater than the vapour pressure of the liquid
- A. Greater than the vapour pressure of the liquid
- B. Less than the vapour pressure of the liquid
- C. Equal to the vapour pressure of the liquid
- D. Less than barometric pressure
Explanation
The suction pressure head must remain above the liquid's vapour-pressure head so that vaporisation and cavitation do not occur at the pump inlet. This is the practical NPSH condition intended by the question.
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