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Mass Transfer

Mass Transfer
The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is

-ve
∞
+ve

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Mass Transfer
Dry bulb temperature of unsaturated air is more than its __________ temperature.

Dew point
Neither A nor B
Wet bulb
Both A & B

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Mass Transfer
The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is

∞
0.5
2
1

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Mass Transfer
In liquid extraction, if the selectivity is unity, then

Solvent flow rate should be very low
Separation of the constituents is the most effective
No separation will occur
Amount of solvent required will be minimum

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Mass Transfer
Separation of two or more components of a liquid solution can not be achieved by

Evaporation
Liquid extraction
Fractional crystallisation
Absorption

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

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

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