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Category: Mass Transfer
Drift in a cooling tower is ___________________?
A. The water entrained by the circulating air
B. Dependent on the water lost by evaporation
C. Desirable
D. All A., B. & C.
The adiabatic saturation curve for a vapour-gas mixture is__________________?
A. Straight line
B. Slightly concave upward
C. Slightly concave downward
D. None of these
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is_________________?
A. Equal to the heat of formation of surface compound
B. Equal to the heat of wetting
C. Zero
D. Called integral heat of adsorption
Liquid diffusivity is of the order of _______________ cm2 /second?
A. 0.01
B. 0.1
C. 10-5 to 10-6
D. > 1
Rose oil is extracted from rose leaves using ____________ distillation?
A. High pressure
B. Low pressure
C. Extractive
D. Steam
In case of constant underflow extraction operation, the _______________________ at all solute concentration?
A. Solids are drained to the same extent
B. Ratio of the insoluble to solution is constant
C. Both A. & B.
D. Neither A. nor B.
Plate efficiency_______________________?
A. Is a function of the mass transfer between liquid and vapour
B. Increases due to foaming
C. Increases due to liquid entrainment
D. Increases due to weeping and dumping of liquid
Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?
A. Viscosity with concentration
B. Degree of ideality of the solution
C. Both A. and B.
D. Neither A. nor B.
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of _______________ is zero?
A. Interface
B. Gas phase
C. Liquid phase
D. All A , B. & C.
Relative volatility does not change appreciably with the change in_____________________?
A. Temperature
B. Vapour pressure of either component
C. Total pressure
D. None of these
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