Engineering Questions with Answers - Multiple Choice Questions
Separation Processes MCQ’s – Pressure Swing Distillation
1 - Question
When is the pressure swing distillation used?
a) When the binary azeotrope changes composition by 5mol% over a moderate range of pressure
b) When the binary azeotrope changes composition by 10mol% over a moderate range of pressure
c) When the binary azeotrope changes composition by 2mol% over a moderate range of pressure
d) When the binary azeotrope changes composition by 0.5mol% over a moderate range of pressure
View Answer
Explanation: Pressure swing distillation is used when a binary azeotrope disappears or changes composition by 5mol% over a moderate range of pressure.
2 - Question
What is done in pressure swing distillation?
a) Two columns in series at same pressure
b) Two columns in parallel at same pressure
c) Two columns in series at different pressures
d) Two columns in parallel at different pressures
View Answer
Explanation: Pressure swing distillations using two ordinary columns in series operating at different pressures.
3 - Question
Which of the following is an application of pressure swing distillation?
a) Tetrahydrofuran-water mixture
b) Hydrochloric acid-methanol mixture
c) Tetrahydrofuran-methanol mixture
d) Hydrochloric acid- tetrahydrofuran mixture
View Answer
Explanation: The minimum boiling azeotrope of Tetrahydrofuran-water mixture is separated by pressure swing distillation.
4 - Question
Formic acid-water mixture is separated using:
a) Salt distillation
b) Extractive distillation
c) Differential distillation
d) Pressure swing distillation
View Answer
Explanation: Formic acid-water mixture is separated using Pressure swing distillation.
5 - Question
Hydrochloric acid-water mixture is separated using:
a) Salt distillation
b) Extractive distillation
c) Differential distillation
d) Pressure swing distillation
View Answer
Explanation: Hydrochloric acid-water mixture is separated using Pressure swing distillation.
6 - Question
Why is recycle ratio a key design factor?
a) Low cost of gas compression
b) High cost of gas compression
c) High equipment cost d) High gas cost
View Answer
Explanation: Due to the high cost of gas compression, the recycle ratio is key design factor.
7 - Question
What does recycle ratio depends on?
a) Variation of azeotropic composition with column pressure
b) Variation of pressure with composition
c) Cost of gas compression
d) Efficiency of instrument
View Answer
Explanation: The recycle ratio depends on Variation of azeotropic composition with column pressure.
8 - Question
In the separation of ethanol-water the feed is __________ in ethanol than azeotrope.
a) Less rich
b) More rich
c) Less clear
d) More clear
View Answer
Explanation: In the separation of ethanol-water the feed is less rich in ethanol than azeotrope.
9 - Question
For pressure swing distillation, due to high cost of gas compression, __________ is akey factor.
a) Efficiency
b) Feed
c) Yield
d) Recycle ratio
View Answer
Explanation: Recycle ratio is the key factor due to high cost of gas compression.
10 - Question
Why is pressure swing distillation costly?
a) High cost of gas compression
b) High cost of equipment
c) High cost of columns
d) Less yield
View Answer
Explanation: Due to high cost of gas compression, the separation technique is costly.