Engineering Questions with Answers - Multiple Choice Questions
Separation Processes MCQ’s – Differential Distillation
1 - Question
In differential distillation, there is no ____________
a) Distillate
b) Reaction
c) Reflux
d) Vapors
View Answer
Explanation: In differential distillation, there is no reflux.
2 - Question
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
Explanation: For total condensation Yd=Xd.
3 - Question
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
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.2.
4 - Question
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
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 1.
5 - Question
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
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.27.
6 - Question
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
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.8.
7 - Question
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
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.4.
8 - Question
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
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.75.
9 - Question
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
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 1.
10 - Question
. 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
Explanation: XD = W0X0 –WX/W0-X, hence Xd= 0.64.