Mechanical Operations
Solid particles separation based on the difference in their flow velocities through fluids is termed as the

Classification
Clarification
Sedimentation
Elutriation

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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
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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