Allied & ICAR Exam Bank • ALLIED_0634 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Size Reduction and Milling

Subtopic: Size Reduction and Milling

Question Statement:

A hammer mill reduces particle size primarily by which mechanical mechanism?

Options:

  • (A) High-velocity impact and shatter
  • (B) Pure compression between slow rollers
  • (C) Hydrodynamic cavitation
  • (D) Ultrasonic vibration

Answer Key:

A

Step-by-Step Solution & Explanation

Free-swinging hammers rotating at $1800-3600\text{ rpm}$ smash unconstrained grains in mid-air and against breaker plates by dynamic impact.
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