Civil Engineering MCQAE Level Civil Engineering
Net Positive Suction Head (NPSH) in a centrifugal pump must be positive to prevent:
Fluid MechanicsNPSHMEDIUM
Choose the correct answer
A
Excessive flow rate
B
Cavitation (vapor bubble formation on impeller)
C
Overheating of motor
D
Bearing failure
Correct Answer
B. Cavitation (vapor bubble formation on impeller)
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NPSH_available = (p_suction - p_vapor) / (rho x g) + V^2/(2g). If NPSH_available < NPSH_required (pump characteristic), cavitation occurs: vapor bubbles form in low-pressure zones and implode, damaging impeller.
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