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Mass Transfer

Mass Transfer
Deairation (removal of O₂) of water is done by

Absorption
Ion-exchange
Adsorption
Rectification

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Mass Transfer
Chemisorption compared to physical absorption has

None of these
Lower adsorption rate
Lower capacity of the solvent for the solute gas
Increased utilisation of stagnant zones of the liquid phase

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Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

1.5
-1.5
0.6
-0.6

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Mass Transfer
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Size
Porosity
Durability
Cost

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Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Increases with time
Decreases with time
Does not affect the moisture content of the wet solid
Does not change with time

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

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