Discussion
Match the size reduction equipment in Column I with the method of operation in Column II.
| Column I | Column II |
|---|---|
| P. Hammer mill | 1. Compression |
| Q. Burr mill | 2. Impact |
| R. Crushing rolls | 3. Cutting |
| S. Rotary knife | 4. Attrition |
Answer: A
The match is P-2, Q-4, R-1, S-3.
- A hammer mill breaks material by the impact of swinging hammers.
- A burr (plate) mill grinds by attrition between two rubbing plates.
- Crushing rolls squeeze material in the nip between two rolls: compression.
- A rotary knife cuts.
The other options assign compression or cutting to the hammer mill, which works by impact.
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