Allied & ICAR Exam Bank • ALLIED_1296 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Size Reduction and Milling

Subtopic: Roll Crusher Nip Angle

Question Statement:

In a smooth double roll crusher of roll radius $R$ processing grain of radius $r$, the maximum angle of nip $2\beta$ for successful feeding without slipping depends directly on the:

Options:

  • (A) Coefficient of friction $\mu$ between grain and roll surface ($\tan \beta \le \mu$)
  • (B) Rotational speed of rolls only
  • (C) Length of roll face
  • (D) Moisture content of rolls

Answer Key:

A

Step-by-Step Solution & Explanation

Resolving tangential friction and normal forces shows that particle drawing requires $\tan \beta \le \mu$, meaning the angle of nip cannot exceed twice the friction angle ($2\beta \le 2\phi$).
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