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Mass Transfer

Mass Transfer
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases 'A' and 'B' is

0.5
1
∞
2

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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
Batch tray dryers suffers from the disadvantage of

High maintenance cost
Non-uniform & low production rate
High labour cost & low heat economy
All of the listed here

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

Decreases linearly
Increases
Remains same
Decreases

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Mass Transfer
If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is

L/G
G/L
None of these
Always < 1

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