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Mass Transfer

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

Evaporation
Dehydration
Adsorption
Sublimation

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Mass Transfer
Smoke is an example of

Liquid dispersed in gas
Solid dispersed in liquid
Gas dispersed in liquid
Solid dispersed in gas

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Mass Transfer
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

Unsaturated surface
Both A & B
Neither A nor B
Constant rate

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Mass Transfer
Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the

Sensible heat
Latent heat
Humid heat
Specific heat

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Mass Transfer
In gas-liquid contact operation, the number of ideal stages, N = (xa - xb)/(xb - x*b) . This is true when the stripping factor 'S' is

S = ∞
S = 1
S > 1
S < 1

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Mass Transfer
During the constant rate period of drying of a solid,

Increased air humidity decreases the rate of drying
Surface evaporation of unbound moisture occurs
Increasing the air temperature decreases the drying rate
None of these

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