Allied & ICAR Exam Bank • ALLIED_1285 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Size Reduction and Milling

Subtopic: Hammer Mills

Question Statement:

In a hammer mill, particle comminution occurs primarily through which mechanism?

Options:

  • (A) High-velocity impact of swinging steel hammers and attrition against breaker plates and perforated screen
  • (B) Pure static compression between two slow rolls
  • (C) Hydraulic fluid shear
  • (D) Ultrasonic cavitation

Answer Key:

A

Step-by-Step Solution & Explanation

Hammers rotating at $2000\text{ to }3600\text{ rpm}$ shatter particles by direct kinetic impact, followed by particle-wall collision and attrition until fragments exit through sizing screen holes.
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