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Mass Transfer

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

D ∝ P0.5
D ∝ 1/P
D ∝ 1/P1.5
D ∝ 1/P0.5

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Mass Transfer
Which of the following assumes constant molal vaporisation and overflow?

McCabe-Thiele method
Plate absorption column
Enthalpy concentration method
Ponchan-Savarit method

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Mass Transfer
McCabe-Thiele method of binary distillation does not assume that the

None of these
Heat of mixing is negligible
Molar latent heats of all components are equal
Sensible heat changes are negligible compared with latent heat changes

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Mass Transfer
In the desorption of highly soluble gas from the liquid, the main resistance will be in the __________ phase.

Neither A nor B
Both A & B
Liquid
Gas

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Mass Transfer
With increase in temperature, the leaching rate increases due to

Both A & B
Decreased liquid viscosity
Increased diffusivity
Neither A nor B

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

>1 and ≈ 1
< 1 and ≈ 1
1 and 0
0 and ≈ 1

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