Mechanical Operations
In classification, particles are said to be equal settling, if they have the same terminal velocities in the

Same field of force
Different fluids
Both B and C
Same fluid

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Mechanical Operations
Rod mills employed for grinding

Employ steel rods of 2-12 cms diameter extending over full length of the mill
Is useful for handling sticky materials
All of these
Employ a steel shell having L/D ratio of 1.5 to 3.0

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