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This quiz contains multiple-choice problems on vapour-liquid equilibria, idealities concepts, flash vapourisation methods, differential distillation methods, distillation column operation, azeotropic mixture rectification, reflux ratio and its cost variance, various distillation types and flash vapourisation laws.
A new phase is given for separation by distillation. True or false?
True
False
Distillation is possible only if the solution components are
Volatile
Non-volatile
Cryogenic
None of the above
No further process is required for
Absorption
Extraction
Distillation
All of the above
Find the relative volatility of a solution of A and B, given the vapour pressure of A is 260 mmHg and B is 360 mmHg.
0.72
1.38
2
None of the above
If the gas phase composition of component A is 0.65 and its relative volatility is 2, find the liquid phase composition.
0.48
0.58
0.68
0.78
Components A and B have the same boiling point. Can they be separated ordinarily?
Yes
No
The possibility of separation will be greater if the factor is greater than 1. True or false?
True
False
Find the vapour pressure of component A in an ideal mixture if its liquid composition and the partial pressure are 0.65 and 260 mmHg, respectively.
260 mmHg
400 mmHg
760 mmHg
Cannot determine
Consider an ideal vapour-liquid binary mixture. Find the total pressure if the vapour pressures of A and B are 260 mmHg and 520 mmHg respectively, and the mole fraction of A is 0.55.
177 mmHg
277 mmHg
377 mmHg
477 mmHg
The enriching section operating line intercepts the origin in the McCabe-Thiele method when
Reflux ratio = 0
Reflux ratio = infinity
Reflux ratio = 1
Reflux ratio = 1.5 * or 2 * Reflux minimum
The McCabe-Thiele method excludes
Entropy
Enthalpy
Flow rate
Number of theoretical stages
To find the total number of theoretical trays, we usually add one additional stage for
Condenser
Reboiler
Condenser or reboiler
No additional trays
Find the slope of the operating line of the fractionator’s top section if the reflux ratio = 2 (the McCabe-Thiele method is applicable).
0.57
0.67
0.77
0.87
Consider a sugar solution [sugar + water]; only water evaporates since sugar is __ on vaporisation.
Volatile
Non-volatile
Cryogenic
None of the above
If the feed enters the distillation column at its dew point, the slope of the flash vaporisation operating line is
0
1
Between 0 and 1
