Mass Transfer
Drying operation under vacuum is carried out to

Reduce drying temperature
Increase drying temperature
Dry materials having high bound moisture content
Dry those materials which have very high unbound mositure content

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Mass Transfer
Pick out the wrong statement pertaining to leaching.

Door classifier can be used for leaching of coarse solids
Vegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor
Very high temperature is not needed for the leaching of sugar beet
Fine solids can not be leached in a Pachuka tank

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