Mechanical Operations
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the

Volatile matter content
Size
Density separation
Differential wettability

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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
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

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