# Distillation Design Questions and Answers – Rigorous Computational Methods

«
»

This set of Distillation Design Multiple Choice Questions & Answers (MCQs) focuses on “Rigorous Computational Methods”.

1. Which of the following is also called Rating method?
a) McCabe Thiele
b) Ponchan Savarit
c) Thiele Geddes
d) Homotomy

Explanation: Thiele Geddes is also called as rating method, McCabe Thiele is called tray analysis method and Ponchan Savarit as enthalpy method.

2. In Thiele Geddes method, which of the following are calculated?
a) Vapor and liquid compositions
b) Input and output fees rates
c) Reflux ratio
d) Boil up

Explanation: Vapor and liquid compositions are calculated In Thiele Geddes method, while reflux ratio in McCabe Thiele method.

3. Which method is the inverse of Thiele Geddes Method?
a) Lewis Matheson
b) Ponchan Savarit
c) McCabe Thiele
d) Homotomy

Explanation: Lewis Matheson is the inverse of Thiele Geddes method, while other listed methods are completely different from each other and all are used to calculate number of trays.

4. Lewis Matheson method can be adjusted, for fixed number of
a) Trays
b) Stages
c) Columns
d) Sections

Explanation: Lewis Matheson method can be adjusted for fixed number of Stages instead of reflux ratio fixed.

5. Tj is assigned as the
a) Stage temperature
b) Boiler temperature
c) Condenser temperature
d) Components temperature

Explanation: Tj is assigned as the Stage temperature, While TC and TB are assigned as condenser and boiler temperature.

6. The value of K is independent of
a) Composition
b) Feed ratio
c) Volatility
d) Reflux

Explanation: As per the relation the value of K is given as the function of KV = f (pure liquid)/f (pure vapor).

7. User provided internal flows are generally for
a) Reflux in high purity
c) Narrow building columns
d) NOR relation

Explanation: User provided internal flows are generally for Reflux in high purity, overhead liquid products and Narrow building columns also called as NOR relation.

8. For accurate Reflux, estimate
a) Reflux of high purity is used
b) Narrow boiling is used
c) Super fractionators are used
d) Final temperature is used

Explanation: For accurate Reflux estimate, narrow boiling is necessary, where separation is required the reflux of high priority is used.

9. Azeotropic composition is?
a) y*>x
b) y*<x
c) y*=x
d) x+y* = 1

Explanation: Azeotropic composition is y*=x, whereas the x+y* = 1 gives the actual mole balance of gas and liquid at equilibrium.

10. Molecular Distillation is
a) For heat sensitive materials
b) Very low pressure distillation
c) High low pressure distillation
d) Purge pressure 