Question Bank • QB_SUB_APE_0215 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Size Reduction Mechanics & Energy Laws

Subtopic: Rittinger law power scaling

Question Statement:

According to Rittinger's law of comminution, the energy consumed per unit mass in size reduction is directly proportional to:

Options:

  • (A) The new surface area produced ($1/L_2 - 1/L_1$)
  • (B) The volume reduction ($L_1^3 - L_2^3$)
  • (C) The natural log of the size reduction ratio $\ln(L_1/L_2)$
  • (D) The square root of feed diameter

Answer Key:

A

Step-by-Step Solution & Explanation

Rittinger's hypothesis states energy is proportional to the new surface area created: $E = K_R \left(\frac{1}{L_2} - \frac{1}{L_1}\right)$. Kick's law uses logarithmic ratio, and Bond's law uses square root of reciprocal sizes.
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