Mass Transfer
Overall efficiency of the distillation column is

The ratio of number of actual plates to ideal plates
The ratio of number of ideal plates to actual plates
Always more than the point efficiency
Same as the Murphree efficiency

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Mass Transfer
In case of an absorber, the operating

Line always lies below the equilibrium curve
Velocity is more than the loading velocity
Line always lies above the equilibrium curve
Line can be either above or below the equilibrium curve

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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
Vegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor
Fine solids can not be leached in a Pachuka tank

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