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

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
Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow
Recommended peripheral speed for the turbine agitator is 200-250 metres/minute
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

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Mechanical Operations
Work index is defined as the

Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen
Energy needed to crush one ton of feed to 100 microns
Energy needed to crush one tonne of feed to 200 microns
Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen

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