Mechanical Operations
Two particles are called to be equal settling, if they are having the same.

None of these
Size
Specific gravity
Terminal velocities in the same fluid & in the same field of force

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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?

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

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