Mass Transfer
Which of the following same diameter columns gives lowest pressure drop per unit height?

Randomly packed column
Bubble-cap column
Packed column (stacked)
Sieve-plate column

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Mass Transfer
Pick out the wrong statement pertaining to leaching.

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

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