Engineering Questions with Answers - Multiple Choice Questions

# Distillation Design MCQ’s – Mccabe Thiele Diagram-Fundamentals

1 - Question

Separation of a volatile mixture of relatively pure products, is done in a
a) Steam distillation
b) Fractionating Column
c) Flash Distillation
d) Depending of product required

Explanation: The separation always depends on the quality of product required independent of operation required.

2 - Question

McCabe Thiele is based on the assumption?
a) Constant molar overflow
b) Constant reflux ratio
c) Volatile products are used for better separation
d) Boil up ratio is infinity

Explanation: The best assumption of the McCabe Method is it is based on Constant molar overflow, while heat duties are neglected in the method.

3 - Question

The vapor rich section in the distillation column is called as
a) Rectifying Section
b) Boiling section
c) Stripping Section
d) Leaching section

Explanation: The part above the feed tray is rich in vapor which is called as rectifying or enriching section and contains only vapor in equilibrium with liquid.

4 - Question

The liquid rich section in a distillation column is called as
a) Boil up section
b) Reflux section
c) Stripping Section
d) Enriching Section

Explanation: The part below the feed tray is enriched with liquid feed which is called as Stripping Section and contains only liquid at the column temperature.

5 - Question

The feed of a distillation column is related to be a
a) Binary mixture
b) Urinary mixture
c) Mixture of phases
d) Tertiary Mixture

Explanation: Mixture of phases i.e. two phase mixture is necessary for distillation, either it can be a multicomponent mixture as per required conditions.

6 - Question

The equilibrium curve of the column is given as
a) yn=x
b) y*=x
c) yn+1=xn
d) xn+1=y

Explanation: The equilibrium curve is the locus of all equilibrium point given as yn+1=xn, while y*=x represents the equilibrium relation of gas and liquid.

7 - Question

The feed line equation is given by
a) F – L = q
b) L’ – L = qF
c) V – V’ =F
d) F = L – V

Explanation: The feed line equation is L’ – L = QF where q is the product of quantity of liquid contained in feed.

8 - Question

The overall Energy balance of a column is given by
a) V1HV1 = L0HL0 + DHD + QC
b) QC = V1HV1
c) V1HV1 = DHD + H0
d) Can change with models

Explanation: The energy balance equation is given as V1HV1 = L0HL0 + DHD + QC, where Qc is the heat provided through reboiler.

9 - Question

If the liquid flow rate is 212 and vapor flow rate is 284, then the slope of rectifying section is?
a) 0.55
b) 0.89
c) 1.33
d) 0.75

Explanation: As slope is given by L/V = 212/284 = 0.75.

10 - Question

If 0.75 is the fraction of liquid in the feed, Estimate the feed line slope?
a) -2.0
b) -1.5
c) -3.0
d) Cannot be calculated