Mechanical Operations
Rod mills employed for grinding

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

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Mechanical Operations
In case of a hammer crusher,

Reduction ratio can be varied by adjusting the distance from cage to hammers
Maximum acceptable feed size is 30 cms
All of these
Crushing takes place by impact breaking

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