Mechanical Operations
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

3.6 W.Dr.ρ
3.6 V.W. ρ
3.6 V.W.Dr.ρ
3.6 V.W.Dr/ρ

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

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