Coal is finally pulverised to 200 mesh size for burning in boilers by a___________________?
Correct answer: D. Ball mill
- A. Hammer crusher
- B. Gyratory crusher
- C. Roll crusher
- D. Ball mill
Explanation
A ball mill provides repeated impact and attrition, making it suitable for pulverising coal to a fine size such as 200 mesh. Hammer, roll, and gyratory crushers are normally used for coarser size reduction.
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