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Mass Transfer

Mass Transfer
If moisture content of solid on dry basis is X, then the same on wet basis is

X/(X + 1)
(X - 1)/X
(X + 1)/X
X/(X - 1)

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Mass Transfer
Under conditions of flooding in packed tower, the gas pressure drop

Decreases rapidly
Is maximum
Increases rapidly
Remains constant

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Mass Transfer
During constant rate period, the rate of drying decreases with the

Neither A nor B
Increase in air humidity
Both A & B
Decrease in air temperature

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Mass Transfer
Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

Evaporation
Liquid extraction
Distillation
Absorption

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Mass Transfer
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

Gas phase
Interface
Liquid phase
All of these

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Mass Transfer
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

44119
70-80
30-40
90-100

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