Rotary Cutter Mill and Roller Mill Principle, Construction, Uses, Advantage, Disadvantage, Question Answer for GPAT, GATE, Pharmacist, Drug Inspector & NIPER JEE Exam ... A. Hammer mill B. Roller mill C. Ball mill D. None of the above. ANSWERS: 1. Compression 2. Screen 3. 500 rotations per min 4. Fibrous material 5. A – 3 B – 4 C – …