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Mass Transfer

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

K ∝ D2
K ∝ D1.5
K ∝ D
K ∝ √D

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Mass Transfer
Rayleigh's equation applies to __________ distillation.

Flash
Steam
Continuous
Differential

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Mass Transfer
Steady state equimolal counter diffusion occurs in case of

Absorption
Binary phase distillation
Liquid-liquid extraction
Leaching

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

95
99
91.5
90

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Mass Transfer
Which of the following remains constant during evaporative cooling process with recirculated water supply?

Wet bulb temperature
Relative humidity
Partial pressure of vapour
None of these

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Mass Transfer
With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

Remains unaffected
Decreases linearly
Decreases
Increases

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