Mechanical Operations
Crushing efficiency is the ratio of the

Surface energy created by crushing to the energy absorbed by the solid
Energy absorbed by the solid to the surface energy created by crushing
Energy fed to the machine to the surface energy created by crushing
Energy absorbed by the solid to that fed to the machine

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Mechanical Operations
A pebble mill

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

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