# Distillation Design Questions and Answers – The Jafarey, Dougles and Mcavoy Equation

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This set of Distillation Design test focuses on “The Jafarey, Dougles and Mcavoy Equation”.

1. Jafarey, Dougles and Mcavoy Equation is capable of predicting
a) Column performance
b) Column feed rate
c) Column design
d) Column diameter

Explanation: Jafarey, Dougles and Mcavoy Equation is capable of predicting Column performance and control of disturbances.

2. The term PLK stands for
a) Primary left key
b) Pseudo Left key
c) Pseudo light key
d) Pressure light key

Explanation: The term PLK stands for Pseudo Left key, which indicated the components which are heavy key and are separated at left side.

3. PHK and PLK are also applied in
a) Hengstebeck’s equation
b) Fenske’s equation
c) Gilliland equation
d) Homotomy equation

Explanation: PHK and PLK are also applied in Hengstebeck’s method, while Fenske’s equation uses the relative volatility.

4. 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

Explanation: Jaffrey Equation is an analytical closed form formula to calculate Number of trays simplifying smoker’s equation.

5. 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

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. PHK stands for
a) Pre Heavy key
b) Pseudo Heavy key
c) Primary Heavy key
d) Pressure Heavy key

Explanation: PHK stands for Pseudo Heavy key representing the bottom end products which are removed at the bottom of column.

7. Dougles equation is useful for
a) Binary separations
b) Multicomponent separations
c) Tertiary Separations
d) Cant’ be specified

Explanation: Dougles equation is useful for multicomponent separations extended form of smoker’s equation.

8. 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

Explanation: as ln (0.95/0.05) (0.90/0.10) = 5.142.

9. Solve the following equation 0.3089R2 – 0.4033R – 0.1242=0?
a) 2.45
b) 1.31
c) 8.9
d) 7.8

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. The overall column efficiency is defined as
a) Nthoretical/Nactual
b) Nthoretical*Nactual
c) Nthoretical=Nactual
d) Nactual + 1

Explanation: The overall column efficiency is defined as Eoverall = Nthoretical/Nactual, whereas Nactual + 1 gives the real number of trays in a column.

Sanfoundry Global Education & Learning Series – Distillation Design.
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