Mechanical Operations
Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ?

Rittinger's law
None of these
Kick's law
Bond's law

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Mechanical Operations
In case of a hammer crusher,

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

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