Mechanical Operations
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

Ball mill, Jaw crusher, Fluid energy mill
Fluid energy mill, Ball mill, Jaw crusher
Jaw crusher, Ball mill, Fluid energy mill
Fluid energy mill, Jaw crusher, Ball mill

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

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