Mechanical Operations
In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the

Square of the viscosity
Filtration time only
Washing time only
Square root of the velocity

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Mechanical Operations
Rod mills employed for grinding

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

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