Mass Transfer
The binary diffusivity in gases at atmospheric conditions is about

10-4 cm²/seC₂
10-3 sec/cm
10-1 cm²/sec
10-9 cm/sec

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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.
Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute
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%
Rotary dryer is suitable for drying sticky material

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Mass Transfer
Pick out the wrong statement pertaining to leaching.

Vegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor
Door classifier can be used for leaching of coarse solids
Fine solids can not be leached in a Pachuka tank
Very high temperature is not needed for the leaching of sugar beet

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