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Mass Transfer

Mass Transfer
Diameter of raschig rings used in packed tower in industry is normally around __________ inches.

12
8
18
2

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Mass Transfer
In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the

Concentration
Temperature and pressure
None of these
Nature of the constituents

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Mass Transfer
Overall efficiency of the distillation column is

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

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Mass Transfer
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)

10
8.89
8.25
6.89

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Mass Transfer
In a binary system, separation is very efficient, when the relative volatility is

< 1
0.5
> 1
1

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Mass Transfer
Deairation (removal of O₂) of water is done by

Adsorption
Ion-exchange
Absorption
Rectification

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