Engineering Questions with Answers - Multiple Choice Questions

# Distillation Design MCQ’s – Stratergy of Solution using Rigorous Methods

1 - Question

The Wang Henke equation is used, for the calculation of
a) Flow rates
b) Volatility
c) Stages
d) Reflux

Explanation: The Wang Henke equation is used for the calculation of component and flow rates, Fenske’s for relative volatility and material balance for flow rates.

2 - Question

Wide boiling and energy coupled systems are drastically
a) Exponential
b) Linear
c) Logarithmic
d) Semi logical

Explanation: Wide boiling and energy coupled systems are drastically Linear, while d/b plots are nonlinear and equilibrium plots are also nonlinear.

3 - Question

Difference between k and k+1 should be very
a) Small
b) Large
c) Zero
d) Unity

Explanation: Difference between k and k+1 should be very small, if the difference increases this could cause problems like stage failure and flooding.

4 - Question

Rigorous method are based on?
a) Heat duties
b) Product compositions
c) Feed tares
d) Stages

Explanation: Rigorous method are based on Heat duties and other methods are based on the feed and Product compositions.

5 - Question

MESH equations are written in terms of?
a) Mass rates
b) Flow rates
c) Vapor rates
d) Liquid rate

Explanation: MESH equations are written in terms of Vapor rates and material balance equations are written in mass and flow rates.

6 - Question

In matrix form, system equation is expressed as
a) rivi = -fj
b) rivi = -Kj
c) rivi = -Gj
d) rivi = -Zj

Explanation: In matrix form system equation is expressed as rivi = -fj, where f is the function of the matrix and ri and vi are rows and columns.

7 - Question

The transposed vapor rate vector, Vi is raised to power of
a) Jk
b) Ik
c) T
d) P

Explanation: As Vi = (di, vi1, vi2, viNT So T is Power, here T represents the temperature on which the vapor rate is measured.

8 - Question

The transposed feed Rate vector, is proportional to
a) T
b) G
c) K
d) P

Explanation: fj = (0, 0, 0……Vi…0, 0)T So T is Power of the function and the zero represents the empty states in the function.

9 - Question

The adiabatic split of vapor and liquid portion are expressed as
a) VIf and LiF
b) KIf and LiF
c) VIf and KiF
d) XIf and YiF

Explanation: The adiabatic split of vapor and liquid portion are expressed as VIf and LIf, These are equally important for all compositions of vapor and liquid.

10 - Question

. The main diagonal mij is expressed as
a) –(1+Aij)
b) -(Aij)
c) 1-Aij
d) Aij