Mechanical Operations
Removal of activated carbon from glycerine is done by

Rotary vacuum filter
Batch basket centrifuge
None of these
Plate and frame filter

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Mechanical Operations
Rod mills employed for grinding

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

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