Engineering Questions with Answers - Multiple Choice Questions

# Separation Processes MCQ’s – Heterogeneous Azeotropic Distillation

1 - Question

Sequences based on heterogeneous azeotropic mixtures are :
a) Common
b) Rare
c) Expensive
d) Inexpensive
Explanation: Sequences based on heterogeneous azeotropic mixtures are common.

2 - Question

Heterogeneous azeotropic distillation is carried out by ___________ process.
a) Batch
b) Continuous
c) Batch and continuous
d) Feed
Explanation: Earlier the process was batch now it is continuous.

3 - Question

The reflux flow is 500 moles/hr and distillate flow is 100moles/hr, what is the value of ϕ by lever rule?
a) 5
b) 4
c) 2.5
d) 1.2
Explanation: ϕ= Reflux flow/ distillate flow=500/100=5.

4 - Question

The reflux flow is 400 moles/hr and distillate flow is 100moles/hr, what is the value of ϕ by lever rule?
a) 5
b) 4
c) 2.5
d) 1.2
Explanation: ϕ= Reflux flow/ distillate flow=400/100=4.

5 - Question

The reflux flow is 250 moles/hr and distillate flow is 100moles/hr, what is the value of ϕ by lever rule?
a) 5
b) 4
c) 2.5
d) 1.2
Explanation: ϕ= Reflux flow/ distillate flow=250/100=2.5.

6 - Question

The reflux flow is 240 moles/hr and distillate flow is 200moles/hr, what is the value of ϕ by lever rule?
a) 5
b) 4
c) 2.5
d) 1.2
Explanation: ϕ= Reflux flow/ distillate flow=240/200=2.5.

7 - Question

The reflux flow is 800 moles/hr and distillate flow is 500moles/hr, what is the value of ϕ by lever rule?
a) 50
b) 4
c) 2.5
d) 1.6
Explanation: ϕ= Reflux flow/ distillate flow=800/500=1.6.

8 - Question

The reflux flow is 5000 moles/hr and distillate flow is 250moles/hr, what is the value of ϕ by lever rule?
a) 5
b) 40
c) 20
d) 1.2
Explanation: ϕ= Reflux flow/ distillate flow=5000/2500=20.

9 - Question

If the value of ϕ is 20 by lever rule and reflux is 6000mol/hr what is distillate rate?
a) 300mol/hr
b) 30mol/hr
c) 400mol/hr
d) 40mol/hr
Explanation: ϕ= reflux flow/distillate flow ,hence distillate flow = reflux flow/ ϕ = 6000/200= 300.

10 - Question

If the value of ϕ is 20 by lever rule and reflux is 8000mol/hr what is distillate rate?
a) 300mol/hr
b) 30mol/hr
c) 400mol/hr
d) 40mol/hr
Explanation: ϕ= reflux flow/distillate flow ,hence distillate flow = reflux flow/ ϕ = 8000/200= 400.

11 - Question

If the value of ϕ is 10 by lever rule and reflux is 3500mol/hr what is distillate rate?
a) 350mol/hr
b) 30mol/hr
c) 450mol/hr
d) 40mol/hr
Explanation: ϕ= reflux flow/distillate flow ,hence distillate flow = reflux flow/ ϕ = 3500/10= 350.

12 - Question

If the value of ϕ is 20 by lever rule and reflux is 2000mol/hr what is distillate rate?
a) 100mol/hr
b) 30mol/hr
c) 400mol/hr
d) 40mol/hr
Explanation: ϕ= reflux flow/distillate flow ,hence distillate flow = reflux flow/ ϕ = 2000/20= 100.

13 - Question

If the value of ϕ is 25 by lever rule and reflux is 3000mol/hr what is distillate rate?
a) 12mol/hr
b) 120mol/hr
c) 240mol/hr
d) 40mol/hr