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Chemical Engineering - Mass Transfer

Exercise : Mass Transfer - Section 13
26.
For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams
increases
decreases
remains unaffected
passes through a maximum
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to
f
f/2
2f
1/f
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is
0.54
1.04
1.24
1.94
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Minimum reflux ratio in a distillation column results in
optimum number of trays.
minimum reboiler size.
maximum condenser size.
minimum number of trays.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Flooding in a distillation column is detected by a sharp
increase in Murphree plate efficiency.
decrease in pressure drop.
decrease in liquid hold up in the coloumn.
increase in pressure drop.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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