Mechanical Operations
Bond crushing law

Is less realistic in estimating the power requirements of commercial crushers
States that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product
States that the work required for the crushing is proportional to the new surface created
Calls for relatively less energy for the smaller product particles, than does the Rittinger law

ANSWER DOWNLOAD EXAMIANS APP

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)

ANSWER DOWNLOAD EXAMIANS APP