Engineering Questions with Answers - Multiple Choice Questions
Distillation Design MCQ’s – The Jafarey, Dougles and Mcavoy Equation
1 - Question
Jafarey, Dougles and Mcavoy Equation is capable of predicting
a) Column performance
b) Column feed rate
c) Column design
d) Column diameter
View Answer
Answer: a
Explanation: Jafarey, Dougles and Mcavoy Equation is capable of predicting Column performance and control of disturbances.
2 - Question
The term PLK stands for
a) Primary left key
b) Pseudo Left key
c) Pseudo light key
d) Pressure light key
View Answer
Answer: b
Explanation: The term PLK stands for Pseudo Left key, which indicated the components which are heavy key and are separated at left side.
3 - Question
PHK and PLK are also applied in
a) Hengstebeck’s equation
b) Fenske’s equation
c) Gilliland equation
d) Homotomy equation
View Answer
Answer: a
Explanation: PHK and PLK are also applied in Hengstebeck’s method, while Fenske’s equation uses the relative volatility.
4 - Question
Jafarey Equation is an analytical closed form formula, to calculate
a) Reflux ratio
b) Number of trays
c) Number of stages
d) Number of feeds
View Answer
Answer: b
Explanation: Jaffrey Equation is an analytical closed form formula to calculate Number of trays simplifying smoker’s equation
5 - Question
In Jafarey Equation, N is predicted with an error of
a) ± 2 to 3
b) ± 1 to 2
c) ± 6 to 7
d) Can’t be specified
View Answer
Answer: a
Explanation: In Jafarey Equation N is predicted with an error of ± 2 to 3 stages, this is an ideal error with respect to human and conservative errors that occur.
6 - Question
PHK stands for
a) Pre Heavy key
b) Pseudo Heavy key
c) Primary Heavy key
d) Pressure Heavy key
View Answer
Answer: b
Explanation: PHK stands for Pseudo Heavy key representing the bottom end products which are removed at the bottom of column.
7 - Question
Dougles equation is useful for
a) Binary separations
b) Multicomponent separations
c) Tertiary Separations
d) Cant’ be specified
View Answer
Answer: b
Explanation: Dougles equation is useful for multicomponent separations extended form of smoker’s equation.
8 - Question
Calculate ln S? If XLK=0.95 and XHK = 0.05 and XL= 0.90 and XH= 0.10, then
a) 6.77
b) 5.142
c) 7.898
d) Can’t be calculated
View Answer
Answer: b
Explanation: as ln (0.95/0.05) (0.90/0.10) = 5.142.
9 - Question
Solve the following equation 0.3089R2 – 0.4033R – 0.1242=0?
a) 2.45
b) 1.31
c) 8.9
d) 7.8
View Answer
Answer: b
Explanation: Using quadratic formula f(x) =0.3089R2 – 0.4033R – 0.1242, and at f (1.31) = 0 we can conclude and thus R=1.31.
10 - Question
The overall column efficiency is defined as
a) Nthoretical/Nactual
b) Nthoretical*Nactual
c) Nthoretical=Nactual
d) Nactual + 1
View Answer
Answer: a
Explanation: The overall column efficiency is defined as Eoverall = Nthoretical/Nactual, whereas Nactual + 1 gives the real number of trays in a column.