Mechanical Operations
A. __________ mill is a revolving mill divided into two or more sections by perforated partitions in which preliminary grinding takes place at one end and the finishing grinding at the discharge end.

Compartment
Rod
Tube
Pebble

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Mechanical Operations
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

Jaw crusher, Ball mill, Fluid energy mill
Fluid energy mill, Ball mill, Jaw crusher
Fluid energy mill, Jaw crusher, Ball mill
Ball mill, Jaw crusher, Fluid energy mill

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

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