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Mass Transfer

Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re
Re0.53
Re0.83
Re0.33

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Mass Transfer
______ is the separation technique used for desalination of sea water.

Absorption
Reverse osmosis
Thermal diffusion
Adsorption

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Mass Transfer
Mass transfer co-efficient 'K' according to penetration theory varies with mass dif-fusivity as

D1.5
D0.5
D
1/D

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Mass Transfer
Drift in a cooling tower is

Desirable
The water entrained by the circulating air
All of these
Dependent on the water lost by evaporation

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Mass Transfer
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.

Higher than
Lower than
Either same or higher than
Same as

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Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

-1.5
-0.6
1.5
0.6

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