This set of Distillation Design Multiple Choice Questions & Answers focuses on “Recovery from Failure and Analyze Results”.
1. The difference between the value which has been computed and the correct value is?
a) Error
b) Shift
c) Dynamic
d) Static
View Answer
Explanation: It is always an error, the deflection in original value from the calculate value is defined as error also can be calculated as percent of error.
2. Inside out method apply, Stripping factor to
a) Adjust Feed
b) Adjust Final Values
c) Adjust flow rates
d) Adjust Reflux
View Answer
Explanation: Inside out method apply Stripping factor to Adjust flow rates, while NR method applies to adjust the reflux.
3. Negative flow may be removed by increasing?
a) Feed
b) Reflux
c) Trays
d) Stages
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Explanation: Negative flow may be removed by increasing Reflux, as the flow increase it causes the danger of flooding and thus increasing reflux is the only option.
4. A reversed temperature profile, means problem with
a) Column temperature
b) Stage temperature
c) Feed temperature
d) Plate temperature
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Explanation: A reversed temperature profile means problem with feed temperature in vapor phase because vapor are intended to rise up and dissolve within liquid thus affecting liquid temperature.
5. Accuracy depends upon the?
a) H value
b) S value
c) T value
d) K value
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Explanation: In rigorous calculation accuracy depends upon the K value, the ratio of the K values is the deciding factor of accuracy of i and j components.
6. Aij is the?
a) Absorption factor
b) Mass transfer area
c) Activity of i and j
d) Stripping Factor
View Answer
Explanation: Aij is the Absorption factor for component i and stage j, while “a” denotes the mass transfer area and V/L is the stripping factor.
7. C is the?
a) Heat capacity
b) Coefficient
c) Total component
d) Final component
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Explanation: C is the Total component or last components also Cp is called heat capacity measure in (KJ/Kg.K) Cp water is 4.328.
8. For the below graph the Pinch point is at?
a) 5th stage
b) 9th stage
c) 10th stage
d) 2nd stage
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Explanation: As seen in the graph Pinch point is at 5th stage, where the operating line and the equilibrium curve meets is called the pinch point.
9. Bubble point is at?
a) A
b) B
c) C
d) Wrong interpretation
View Answer
Explanation: A represents the bubble point at P-T Curve starting, as then temperature increases and approaches the dew point.
10. In the same diagram, Critical point is at?
a) A
b) B
c) C
d) Wrong interpretation
View Answer
Explanation: C represents the bubble point at P-T curve where it is the Extreme point, the highest value reached and then the curve decreases to lowest temperature.
Sanfoundry Global Education & Learning Series – Distillation Design.
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