Mechanical Operations
Crushing efficiency is the ratio of the

Energy absorbed by the solid to the surface energy created by crushing
Energy absorbed by the solid to that fed to the machine
Energy fed to the machine to the surface energy created by crushing
Surface energy created by crushing to the energy absorbed by the solid

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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
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
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

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