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Mass Transfer

Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the temperature (T) as

D ∝ T
D ∝ T1.5
D ∝ T0.5
D ∝ T2

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Mass Transfer
Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture?

Bamboo
Anthracite coal
Rag paper
Inorganic solids

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Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ D2
K ∝ D
K ∝ D1.5
K ∝ √D

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Mass Transfer
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.

Wet bulb temperature
Relative humidity
Partial pressure of water vapor
None of these

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Mass Transfer
In McCabe-Thiele method, at infinite reflux ratio

The overhead product is minimum
Both the operating lines coincide with diagonal
Neither A nor B
Both A & B

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

Adsorption
Evaporation
Sublimation
Dehydration

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