Subtopic: Mechanics and energy requirement in size reduction of agriculture produce
Question Statement:
Match the following types of mill in Column I based on their grinding mechanisms in Column II:
| Column I | Column II |
|---|---|
| P. Attrition mill | 1. Compression and shear |
| Q. Ball mill | 2. Impact and abrasion |
| R. Hammer mill | 3. Crushing and shear |
| S. Roller mill | 4. Impact and shear |
Options:
(A) P-3; Q-2; R-4; S-1
(B) P-2; Q-3; R-4; S-1
(C) P-3; Q-1; R-4; S-2
(D) P-3; Q-4; R-1; S-2
Official Answer Key:
A
Step-by-Step Solution & Explanation
P. Attrition mill → 3. Crushing and shear. Material is rubbed between two grooved plates (one rotating, one stationary); the dominant actions are crushing and rubbing/shear.
Q. Ball mill → 2. Impact and abrasion. Tumbling balls in a rotating drum strike the charge (impact) and roll over it (abrasion).
R. Hammer mill → 4. Impact and shear. Swinging hammers at high tip speed strike the particles, with additional shear against the screen and breaker plate.
S. Roller mill → 1. Compression and shear. Material is nipped between counter-rotating rolls; differential roll speeds add a shearing action to the compression.
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