Why is a minimum of net positive suction head (NPSH) required for a hydraulic pump?

Why is a minimum of net positive suction head (NPSH) required for a hydraulic pump? Correct Answer To prevent cavitation

NPSH is the difference of absolute pressure head at the inlet to the pump and the vapour pressure head corresponding to temperature of the liquid pumped plus the velocity head. The NPSH should always be positive to keep away the cavitation.
Bissoy MCQ

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