Question Bank • QB_IDE_EXP_082 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Wells and Pumps

Subtopic: Pump characteristics

Question Statement:

Cavitation in a centrifugal irrigation pump occurs when the absolute fluid pressure at the impeller eye falls below the:

Options:

  • (A) Saturation vapor pressure of the liquid at operating temperature
  • (B) Atmospheric pressure
  • (C) Shut-off head pressure
  • (D) Discharge piping static pressure

Answer Key:

A

Step-by-Step Solution & Explanation

When the local static pressure drops below the saturation vapor pressure of the liquid, vapor bubbles nucleate and subsequently collapse violently against the impeller vanes in higher pressure regions, causing cavitation pitting and vibration.
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