Question Bank • QB_SUB_IDE_0250 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Pump Cavitation, NPSH & Installation

Subtopic: NPSH Available calculation

Question Statement:

To prevent destructive cavitation in a centrifugal irrigation pump, the installation must ensure that:

Options:

  • (A) $\text{NPSH}_{\text{Available}} > \text{NPSH}_{\text{Required}}$
  • (B) $\text{NPSH}_{\text{Available}} < \text{NPSH}_{\text{Required}}$
  • (C) Suction lift is at least 15 meters
  • (D) Discharge valve is completely closed

Answer Key:

A

Step-by-Step Solution & Explanation

Cavitation occurs if local static pressure drops to the liquid vapor pressure. Thus, available net positive suction head must exceed the manufacturer's required NPSH by a safe margin.
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