This set of Mass Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Rectification of Azeotropic Mixtures”.
1. Fractionator(s) required for separating binary azeotropic mixture is
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: Azeotropes has the same boiling point so for effective separation of two mixture we need additional fractionator since the vapour.
2. Process mainly involved in Azeotropic separation is
a) Condensation
b) Decantation
c) Agitation
d) All of the mentioned
View Answer
Explanation: Decantation is the process of separating the two solutions by precipitation or other. The decanted products are sent to the other fractionator.
3. The second fractionator tower is applicable for the stripping process alone.
a) True
b) False
View Answer
Explanation: Yes. On the second fractionator, the more volatile components get transferred from condensed liquid to the reboiler vapour.
4. Condenser required for rectifying binary Azeotropic mixture is
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: Since the distillate vapour from the fractionator are sent to the same condenser used for the first for minimizing the fixed cost.
5. If the distillate has a composition of azeotrope and the residue has rich phase of one component. Then the azeotropic mixture is a
a) Maximum-boiling mixture
b) Minimum boiling mixture
c) Constant boiling mixture
d) Differential boiling mixture
View Answer
Explanation: Minimum boiling mixture is the mixture where the high volatile component goes to the distillate and other comes to residue.
6. Distillate from the first fractionator should be ______ bubble point.
a) Below
b) More than
c) Equals to
d) None of the mentioned
View Answer
Explanation: If the distillate is above bubble point then the vapour gets loss from the decanter.
7. The method applicable for Azeotropic rectification is
a) McCabe method
b) Ponchon method
c) Extraction method
d) Other method
View Answer
Explanation: Rectification of azeotropes is based on enthalpy data so Ponchon Savorit method is preferred.
8. For the azeotropic rectification which, of the following is applicable?
a) Distillate should be above bubble point
b) To have the excessive vapour loss
c) To decrease the internal reflux ratio
d) None of the mentioned
View Answer
Explanation: Since if the internal reflux ratio is increased the vapours will get loss. The vapour loss will affect the separation.
9. For the maximum boiling mixture, the residue has the azeotropic mixture.
a) True
b) False
View Answer
Explanation: Since the maximum boiling mixture is for low volatile component it will comes to the residue and separated by adding other components.
10. To prevent the composition change the vapour should not gets loss from the decanter.
a) True
b) False
View Answer
Explanation: If the vapour gets loss it will affect the compositions of the residue.
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