Which of the following achieves the least reduction ratio for a given feed size ?
Correct answer: B. Roll crusher
- A. Jaw crusher
- B. Roll crusher
- C. Cone crusher
- D. Gyratory crusher
Explanation
Roll crushers generally operate with a relatively small size-reduction ratio, commonly about 3 to 4, whereas jaw, cone, and gyratory crushers can achieve larger ratios. Therefore, the roll crusher gives the least reduction ratio among these choices.
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