Mechanical Operations
Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called

Clarification
Sedimentation
Decantation
Classification

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

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

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