Separation Processes Questions and Answers – Differential Distillation

This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Differential Distillation”.

1. In differential distillation, there is no ____________
a) Distillate
b) Reaction
c) Reflux
d) Vapors
View Answer

Answer: c
Explanation: In differential distillation, there is no reflux.

2. What is the condition for Yd and xd for toatal condensation?
a) Yd greater than xd
b) Yd smaller than xd
c) Yd smaller than or equal to xd
d) Yd equal to xd
View Answer

Answer: d
Explanation: For total condensation Yd=Xd.

3. What is the mole fraction in instantaneous distillate if:
Moles of liquid in residue at start W0= 1000
Moles of liquid in residue at end W= 500
Mole fraction in liquid at start X0 = 0.6
Mole fraction in liquid at end X= 0.5
a) 0.2
b) 0.3
c) 0.4
d) 0.5
View Answer

Answer: a
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.2.
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4. What is the mole fraction in instantaneous distillate if:
Moles of liquid in residue at start W0= 800
Moles of liquid in residue at end W= 500
Mole fraction in liquid at start X0 = 0.5
Mole fraction in liquid at end X= 0.1
a) 0.2
b) 0.3
c) 1
d) 0.5
View Answer

Answer: c
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 1.

5. What is the mole fraction in instantaneous distillate if:
Moles of liquid in residue at start W0= 2000
Moles of liquid in residue at end W= 500
Mole fraction in liquid at start X0 = 0.3
Mole fraction in liquid at end X= 0.4
a) 0.23
b) 0.34
c) 0.27
d) 0.56
View Answer

Answer: c
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.27.
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6. What is the mole fraction in instantaneous distillate if:
Moles of liquid in residue at start W0= 1000
Moles of liquid in residue at end W= 500
Mole fraction in liquid at start X0 = 0.5
Mole fraction in liquid at end X= 0.2
a) 0.2
b) 0.66
c) 0.4
d) 0.8
View Answer

Answer: d
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.8.

7. What is the mole fraction in instantaneous distillate if:
Moles of liquid in residue at start W0= 1000
Moles of liquid in residue at end W= 500
Mole fraction in liquid at start X0 = 0.25
Mole fraction in liquid at end X= 0.1
a) 0.2
b) 0.3
c) 0.4
d) 0.5
View Answer

Answer: c
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.4.
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8. What is the mole fraction in instantaneous distillate if:
Moles of liquid in residue at start W0= 1000
Moles of liquid in residue at end W= 600
Mole fraction in liquid at start X0 = 0.6
Mole fraction in liquid at end X= 0.5
a) 0.2
b) 0.67
c) 0.44
d) 0.75
View Answer

Answer: d
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.75.

9. What is the mole fraction in instantaneous distillate if:
Moles of liquid in residue at start W0= 1000
Moles of liquid in residue at end W= 500
Mole fraction in liquid at start X0 = 0.7
Mole fraction in liquid at end X= 0.4
a) 0.2
b) 1
c) 0.4
d) 0.5
View Answer

Answer: b
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 1.
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10. What is the mole fraction in instantaneous distillate if:
Moles of liquid in residue at start W0= 1000
Moles of liquid in residue at end W= 300
Mole fraction in liquid at start X0 = 0.6
Mole fraction in liquid at end X= 0.5
a) 0.26
b) 0.61
c) 0.64
d) 0.59
View Answer

Answer: c
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.64.

Sanfoundry Global Education & Learning Series – Separation Processes.

To practice all areas of Separation Processes, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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