Mechanical Operations
For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?

Leva
None of these
Kozney-Karman equation
Blake-Plummer equation

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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
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
Energy needed to crush one tonne of feed to 200 microns

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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

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

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