Mass Transfer
Positive deviation from Raoult's law means a mixture whose total pressure is

Less than that computed for ideality
Greater than that computed for ideality
None of these
Less than the sum of the vapour pressure of the components

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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
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.
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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