Allied & ICAR Exam Bank • ALLIED_0567 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Centrifugal Pumps and Cavitation

Subtopic: Centrifugal Pumps and Cavitation

Question Statement:

To prevent cavitation at the impeller eye of an agricultural centrifugal pump, the installation must ensure that:

Options:

  • (A) $NPSH_{available} > NPSH_{required}$
  • (B) $NPSH_{available} < NPSH_{required}$
  • (C) Suction head equals zero
  • (D) Discharge is zero

Answer Key:

A

Step-by-Step Solution & Explanation

Available Net Positive Suction Head ($NPSH_A$) must exceed pump manufacturer's required $NPSH_R$ by a safety margin of at least $0.5-1.0\text{ m}$ to prevent vapor bubble formation.
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