Mass Transfer
Use of packed towers for distillation is generally limited to the

Vacuum distillation
Multicomponent distillation
Small sizes
High pressure operation

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Total cost first decreases and then increases
Liquid flow increases while the vapor flow decreases for a system
Slope of the operating line in stripping section decreases
Number of plates decreases very slowly first and then more and more rapidly

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

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%
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.

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