Mechanical Operations
Close circuit grinding by a ball mill with air sweeping employs a

Cyclone separator between mill & classifier
Both A & B
Classifier
Neither A nor B

ANSWER DOWNLOAD EXAMIANS APP

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

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
Both the rolls run necessarily at the same speed

ANSWER DOWNLOAD EXAMIANS APP