Mass Transfer
Pick out the wrong statement pertaining to the rotary dryer.

Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.
Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute
Rotary dryer is suitable for drying sticky material
Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%

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Mass Transfer
Which of the following processes is not an example of adsorption applied to gaseous separations?

Removal of objectionable odour and impurities from industrial gases
Dehumidification of air and gas
Decolouration of yellow glycerene
Recovery of valuable solvent vapors from dilute mixture with air and other gases

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Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Pressure drop in the equipment will be very high
None of these
Viscosity variation of the fluids may cause channeling/flooding

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