A. Vapors and liquids are at their dew point and bubble point respectively
B. Driving force for the liquid flow is its specific weight
C. Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from
the bottom to the top of the column
D. Highest temperature is encountered at the top of the column
Related Mcqs:
- As the reflux ratio in a distillation column is increased from the minimum, the______________________?
A. Slope of the operating line in stripping section decreases
B. Number of plates decreases very slowly first and then more and more rapidly
C. Total cost first decreases and then increases
D. Liquid flow increases while the vapor flow decreases for a system - 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 - Packed column distillation is limited to the column _____________ metres?
A. Height < 6
B. Diameter < 0.6
C. Both A. & B.
D. Neither A. nor B. - A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?
A. Composition of vapors and that of liquid do not vary throughout the column
B. Reboiler load and condenser load are minimum
C. The top and bottom compositions are unchanged with and without total reflux
D. The top and bottom compositions correspond to the maximum enrichment available - The operating cost of a distillation column at minimum reflux ratio is____________________?
A. Minimum
B. Maximum
C. Infinite
D. Zero - For a distillation column operating at minimum reflux, the_______________________?
A. Concentration of liquid and vapour leaving a plate will be same
B. Reflux ratio will be maximum
C. Number of plates required will be maximum
D. None of these - 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 - Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?
A. Cost
B. Availability
C. Toxicity
D. Selectivity - In stripping section of continuous distillation column, the_______________________?
A. Liquid is stripped of high boiler
B. Liquid is enriched with high boiler
C. Vapour is stripped of low boiler
D. None of these - At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?
A. 0
B. 1
C. ∞
D. < 1
