Mass Transfer
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

Higher absolute (specific) humidity
Higher dew point
Higher wet bulb temperature
Higher relative humidity

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

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

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Mass Transfer
An example of elutioh is

Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank
Dissolution of tannin out of tree barks by water
Separation of sugar from sugar beet by hot water
Recovery of vegetable oils from seeds

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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.
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%
Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute

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