Mechanical Operations
A propeller agitator

Is used for mixing high viscosity pastes
Produces mainly axial flow
Runs at very slow speed (2 rpm)
All of these

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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
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

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Mechanical Operations
A pebble mill

Is a tube mill lined with ceramic or other non-metallic liner
Both B and C
Employs flints or ceramic pebbles as the grinding medium
Is a ball mill

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