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

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

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Mechanical Operations
Pick out the wrong statement pertaining to the turbine agitator.

Turbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators sh
Generally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter while the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator diamete
Recommended peripheral speed for the turbine agitator is 200-250 metres/minute
Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow

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