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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Mechanical Operations
Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the

Powdered food & granular materials
Dry chemicals
Light metal powder down upto 4 meshsize
Heavy tonnages of rocks or gravel

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