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Mass Transfer

Mass Transfer
In case of liquids, the binary diffusivity is proportional to (where, T = temperature)

√T
T²
1/T
T

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Mass Transfer
Design calculation for multiple component distillation is done by

Mccabe-Thiele method
Enthalpy concentration method
Ponchon-Savarit method
Tray to tray calculations

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Mass Transfer
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

Momentum diffusivity to thermal diffusivity
None of these
Mass diffusivity to momentum diffusivity
Thermal diffusivity to mass diffusivity

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Mass Transfer
For a binary mixture with low relative volatility, continuous rectification to get pure products will require

Less number of trays
High reflux ratio
Low reflux ratio
Small cross-section column

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Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

95
91.5
90
99

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Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/ky.Cz is around

1
0.24
0.6
0.72

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