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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

1
5 to 10
1 to 5
> 10

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Mass Transfer
Overall efficiency of the distillation column is

The ratio of number of actual plates to ideal plates
The ratio of number of ideal plates to actual plates
Same as the Murphree efficiency
Always more than the point efficiency

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Mass Transfer
Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes?

Plate towers
Spray towers
Wetted wall columns
Packed towers

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Mass Transfer
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

Is same as
Is greater than
Is lower than
Cannot be predicted as data are insufficient

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Mass Transfer
Freundlich equation applies to the adsorption of solute from

Dilute solutions, over a small concentration range
Gaseous solutions at high pressure
Concentrated solutions
None of these

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 - Ro) = Ro/Ri
(1 + Ro) = Ro/Ri
(1 + Ri) = Ro/Ri
(1 - Ri) = Ro/Ri

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