Subtopic: Mechanics and energy requirement in size reduction of agriculture produce
Question Statement:
Which of the following statements regarding the comminution laws of size reduction are CORRECT?
Options:
(A) Rittinger's law accurately predicts energy requirements for fine grinding where the creation of new surface area dominates ($d < 0.1\text{ mm}$)
(B) Kick's law relates energy to the volumetric reduction ratio and is most applicable to coarse crushing ($d > 50\text{ mm}$)
(C) Bond's law is widely utilized for intermediate size reduction ranges ($0.1\text{ mm} < d < 50\text{ mm}$) such as ball milling and hammer milling of grains
(D) Bond's work index $W_i$ has units of $\text{kJ/mol}$ and is completely independent of feed moisture content
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
Statements A, B, and C correctly describe the valid particle size regimes for Rittinger's, Kick's, and Bond's laws. Statement D is INCORRECT because Bond's work index $W_i$ is expressed in $\text{kWh/tonne}$ (or $\text{kWh/ton}$) and strongly depends on moisture content, grain hardness, and anatomical structure.