Mechanical Operations
A pebble mill

Both B and C
Is a tube mill lined with ceramic or other non-metallic liner
Is a ball mill
Employs flints or ceramic pebbles as the grinding medium

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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
Crushing takes place by impact breaking
All of these

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