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Mass Transfer

Mass Transfer
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

3.97
0.24
1
600

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Mass Transfer
On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

Increased reflux ratio
Increased reboiler load
Greater degree of separation with a fixed number of trays
None of these

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Mass Transfer
Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution.

Degree of ideality
Viscosity
Neither A nor B
Both A & B

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Mass Transfer
Radioactive nuclear waste is treated in

Pulsed column extractor
Bollman extractor
Rotating-disc contactor
Mixer-settler extractor

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Mass Transfer
The rate of mass transfer is not dependent upon the

Interfacial surface exposed between the phases
Both A & B
Degree of dispersion of one fluid in the other
None of these

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Mass Transfer
The adiabatic saturation curve for a vapour-gas mixture is

Slightly concave downward
Slightly concave upward
None of these
Straight line

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