E-PolyLearning

16. If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively
a. A
b. B
c. C
d. None of these
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Answer: (b).B

17. Below is given an equilibrium moisture curve of a substance. State which regions represent free moisture and unbound moisture respectively.
a. II, III
b. II, IV
c. IV, III
d. IV, II
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Answer: (a).II, III

18. The following expression is
a. differential distillation equation
b. for NtoG in absorption for dilute mixture
c. slope of q-line in McCabe-Thiele method
d. for relative volatility
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Answer: (a).differential distillation equation

19. Which of the following is the correct ternery diagram for liquid-liquid extraction system comprising of one pair partly soluble (e.g. water-benzene-acetic acid in which A-diluent, B - solvent and C - solute)?
a. A
b. B
c. C
d. D
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Answer: (a).A

20. The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if
a. A
b. B
c. C
d. D
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Answer: (b).B

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