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.Management Sciences
Category: Mass Transfer
Raoult’s law is applicable to the_____________________?
A. Ideal solutions
B. Real solutions
C. Mixture of water and alcohol
D. Non-ideal gases
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around_________________?
A. 1
B. 0.24
C. 3.97
D. 600
The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________?
A. D ∝ P0.5
B. D ∝ 1/P0.5
C. D ∝ 1/P
D. D ∝ 1/P1.5
Leaching of uranium ore and gold ore is done in________________________?
A. Centrifugal extractor
B. Pachuca tanks
C. Bollman extractor
D. None of these
Components, having widely different boiling point in a binary mixture, can be separated using ________________ distillation?
A. Molecular
B. Extractive
C. Steam
D. Simple
A minimum boiling azeotrope is exemplified by__________________________?
A. Toluene-benzene
B. Acetone-carbon disulphide
C. Water-isobutyl alcohol
D. None of these
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the____________________?
A. Packing may be crushed due to thermal expansion/contraction of the components of the
equipments
B. Pressure drop in the equipment will be very high
C. Viscosity variation of the fluids may cause channelling/flooding
D. None of these
The relative volatility of a binary mixture at constant temperature _________________ the total pressure?
A. Decreases with increase in
B. Increases with increase in
C. Is independent of
D. None of these
Sides of equilateral-triangular co-ordinates (on which ternary liquid system is plotted) represent ______________________?
A. A pure component
B. A binary mixture
C. A ternary mixture
D. Partially miscible ternary system
When the temperature and humidity of air is low, we usually use _______________ draft cooling tower?
A. Natural
B. Forced
C. Induced
D. None of these
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