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

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Mechanical Operations
A filter press is

Not suitable, if the liquid is the main product
Having prohibitively high maintenance cost
Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure
A batch filter

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