Mechanical Operations
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the

Size
Differential wettability
Density separation
Volatile matter content

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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
Maximum feed size determines the required roll diameter
Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced

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