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
View Answer
Answer: b
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
View Answer
Answer: c
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)
View Answer
Answer: d
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)
View Answer
Answer: b
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
View Answer
Answer: b
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
View Answer
Answer: a
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
View Answer
Answer: c
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
View Answer
Answer: a
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
View Answer
Answer: a
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
View Answer
Answer: a
Explanation: Each row acts as a Different factor, the pressure, temperature, volume all other factors are arranged in a separate column to differentiate between them.