Mass Transfer
In case of an absorber, the operating

Line always lies below the equilibrium curve
Line always lies above the equilibrium curve
Velocity is more than the loading velocity
Line can be either above or below the equilibrium curve

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Number of plates decreases very slowly first and then more and more rapidly
Slope of the operating line in stripping section decreases
Liquid flow increases while the vapor flow decreases for a system
Total cost first decreases and then increases

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Mass Transfer
Entrainer used in azeotropic distillation should

Form a new azeotrope of low relative volatility with one of the constituents of the mixture
Form a low boiling azeotrope with one of the constituents of the mixture
Have high viscosity to provide high tray efficiency
Have high latent heat of vaporisation

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