A. Sensible heat changes are negligible compared with latent heat changes
B. Molar latent heats of all components are equal
C. Heat of mixing is negligible
D. None of these
Related Mcqs:
- In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at ________________ reflux ?
A. Total
B. Minimum
C. Operating
D. Maximum permissible - In McCabe-Thiele method, at infinite reflux ratio___________________?
A. Number of plates is maximum
B. Overhead product is maximum
C. Both the operating lines coincide with the diagram
D. None of these - In McCabe-Thiele method, at infinite reflux ratio________________?
A. The overhead product is minimum
B. Both the operating lines coincide with diagonal
C. Both A. and B.
D. Neither A. nor B. - If f = moles of vapour present per mole of feed, then the slope of feed line is (McCabe- Thiele method) ________________________?
A. (1 – f)/f
B. – (f – 1)/f
C. -1/f
D. -f/(1 – f) - According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the column ?
A. 5
B. 9
C. 12
D. 28 - McCabe-Thiele method________________?
A. Uses molal units for material and energy balance
B. Uses weight fractions to express liquid and vapour composition
C. Can use any type of units
D. Is more accurate than Ponchon-Savarit method - In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of_______________________?
A. Area between operating line and 45° diagonal x-y diagram
B. Condenser and reboiler surfaces
C. Tower cross-section
D. None of these - In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the__________________?
A. Temperature and pressure
B. Concentration
C. Nature of the constituents
D. None of these - Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele’s method ?
A. Partial condenser
B. Total condenser
C. Reboiler
D. Both B. and C - Components, having widely different boiling point in a binary mixture, can be separated using ________________ distillation?
A. Molecular
B. Extractive
C. Steam
D. Simple
