Engineering Questions with Answers - Multiple Choice Questions

# Distillation Design MCQ’s – Tridiagonal Matrix Method for Material Balances

1 - Question

For a partial Condenser, the terms for middle diagonals are?
a) KIf and LiF
b) -(1+L1/KI1D)
c) -(Aij)
d) Aij

Explanation: For a partial Condenser the terms for middle diagonals -(1+L1/KI1D)=mi1 and Aij represents the factor of equilibrium.

2 - Question

For a partial Condenser, the terms for lower diagonals are?
a) -(1+L1/KI1D)
b) -(Aij)
c) L1/KI1D
d) Aij

Explanation: For a partial Condenser the terms for lower diagonals are L1/KI1D=Ai1 and L1/KI1D represents the equivalent to absorption factor.

3 - Question

For a reboiler stage N, the middle diagonal is
a) -(1+L1/KI1D)
b) KIf and LiF
c) L1/KI1D
d) -(1+B1/KI1VN)

Explanation: For a reboiler stage N the middle diagonal is-(1+B1/KI1VN), -(1+L1/KI1D) represents the next set of absorption factor of next + 1 stages.

4 - Question

For a total condenser, the reflux ratio just include
a) L1/KI1D
b) – (1+L1/D)
c) – (1+L1/KI1D)
d) – (Aij)

Explanation: For a total condenser the reflux ratio just include mij= – (1+L1/D), Where D is the distillate of the column and L is the liquid flow rate of column.

5 - Question

In matrix form, the total material balance equations are expressed as
a) F V=-R
b) RV=-F
c) L/V=F
d) V/R = F

Explanation: In matrix form the total material balance equations are expressed as RV= -F, this matrix can be solved either by determinant method or L U method.

6 - Question

In Thomas algorithm
a) Stage factor is calculated
b) Reflux factor is calculated
c) Feed factor is calculated
d) Boil up factor is calculated

Explanation: In Thomas algorithm Stage factor is calculated, in various other such as matrix method the reflux and the feed factor are to be calculated.

7 - Question

Forward elimination always starts from the
a) Right of corner
b) Middle of corner
c) Upper left corner
d) Last row

Explanation: Forward elimination always starts from the upper left corner, all elements are covered as the approach is from top to bottom.

8 - Question

Back substitution always starts from the
a) Lower right corner
b) Middle of corner
c) Upper right corner
d) Last row

Explanation: Back substitution always starts from the lower right corner and all elements are considered as the bottom to top approach method.

9 - Question

For Wide boiling mixtures, K value is
a) Different at different places
b) Same at different places
c) Specific at any time
d) Final Temperature based

Explanation: Wide boiling mixtures have K value is Different at different places, K value is independent of temperature, pressure and other affecting phenomena.

10 - Question

Each row acts as a
a) Different factor
b) Same factor
c) Coinciding factors
d) Elliptical Factor