Mechanical Operations
In case of a hammer crusher,

Reduction ratio can be varied by adjusting the distance from cage to hammers
All of these
Crushing takes place by impact breaking
Maximum acceptable feed size is 30 cms

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

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