Mechanical Operations
Pick out the wrong statement pertaining to the roll crushers.

Both the rolls run necessarily at the same speed
Maximum feed size determines the required roll diameter
For hard material's crushing, the reduction ratio should not exceed 4
Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced

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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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