Mechanical Operations
Which of the following is the most suitable for handling fibrous and dense slurries?

Cone type agitator
Propeller agitator
Radial propeller agitator
Turbine agitator

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Mechanical Operations
Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is

All of these
Separated from the cake by dissolving solids or by burning it off
Added to the feed slurry
Precoated on the filter medium prior to filtration

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