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Mass Transfer

Mass Transfer
Mechanism of moisture removal in case of freeze drying of food stuff is by

Dehydration
Sublimation
Adsorption
Evaporation

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Mass Transfer
Only small amount of evaporation of water produces large cooling effects because of its

Large latent heat
Small latent heat
Low viscosity
None of these

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Mass Transfer
Which of the following provides maximum contact surface for a liquid-vapour system?

Wetted wall column
Packed tower
Bubble-cap plate column
Seive-plate column

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Mass Transfer
Make up water is required in a cooling tower to replace the water lost by

Drift
All of these
Evaporation
Blowdown and leakage

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Mass Transfer
Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.

Sherwood
Peclet
Schmidt
Stanton

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Mass Transfer
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

Humidification only
Both heating and humidification
Heating only
Evaporative cooling

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