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Question
Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?
Options:
A .  Wet grinding in low viscous suspension
B .  Wet grinding in high viscous suspension
C .  Dry grinding of large particles (upto 1.25 cms)
D .  Dry grinding of large particles in un-baffed mills
Answer: Option D
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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