Mechanical Operations
Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?

Rod mill
Ball mill
Fluid energy mill
Gyratory crusher

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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

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

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