Mass Transfer
To remove all the moisture from a wet solid it requires exposure to __________ air.

High temperature
None of these
Highly humid
Perfectly dry

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Mass Transfer
At equilibrium the concentration of water in vapour phase (C*)in kg/m³ of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m³ containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is

1
0.2
0.4

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Mass Transfer
For absorbing a sparingly soluble gas in a liquid

Liquid side mass transfer co-efficient should be decreased
Gas side mass transfer co-efficient should be increased
Mass transfer co-efficient must be kept constant
Liquid side mass transfer co-efficient should be increased

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Mass Transfer
McCabe-Thiele method

Is more accurate than Ponchan-Savarit method
Can use any type of units
Uses weight fractions to express liquid and vapour composition
Uses molal units for material and energy balance

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