In case of a ball mill ?
Correct answer: D. Coarse feed requires a larger ball
- A. None of these
- B. Fine feed requires a larger ball
- C. Operating speed should be more than the critical speed
- D. Coarse feed requires a larger ball
Explanation
Coarse feed particles need larger balls so that the impact force is sufficient to break them. A ball mill is normally operated below its critical speed, since operation above it causes the balls to centrifuge instead of falling.
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