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

Both the rolls run necessarily at the same speed
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
Maximum feed size determines the required roll diameter

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Mechanical Operations
In case of grinding in a ball mill

Grinding cost and power requirement increases with increasing fineness of the products
All of these
Its capacity decreases with increasing fineness of the products
Wet grinding achieves a finer product size than dry grinding

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