Mechanical Operations
In case of a hammer crusher, the final product size depends on the

All of these
Feed rate
Clearance between hammer & grinding plates
Rotor speed

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Mechanical Operations
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?

Wet grinding in low viscous suspension
Dry grindng of large particles in un-baffed mills
Wet grinding in high viscous suspension
Dry grinding of large particles (upto 1.25 cms)

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