Distillation Design Mcqs

Q:

The locus of points in the composition space where the temperature for a given mixture at vapor-liquid equilibrium is constant, is called?

A) Isotherm B) Paratherm
C) Dual nature D) Final-therm
 
Answer & Explanation Answer: A) Isotherm

Explanation: Liquid isotherms are lines of constant value of the boiling temperature and vapor isotherms are lines of constant value of the condensation temperature.

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24
Q:

The locus of compositions that cannot be crossed by the given distillation process, is called?

A) Distillation line B) Distillation Boundary
C) Distillation Map D) Distillation region
 
Answer & Explanation Answer: B) Distillation Boundary

Explanation: The locus of compositions that cannot be crossed by the given distillation process, the existence and location of such boundaries depend critically on the type of distillation in question.

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21
Q:

Bottom flowrate (B) is used to control the level in?

A) Rampage B) Reflux
C) Reboiler D) Condenser drum
 
Answer & Explanation Answer: C) Reboiler

Explanation: Bottom flowrate (B) is used to control the level in reboiler, for the extractive middle vessel batch distillation column.

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16
Q:

Distillate flowrate (D) is used to control the level in?

A) Rampage B) Reflux
C) Reboiler D) Condenser drum
 
Answer & Explanation Answer: D) Condenser drum

Explanation: Distillate flowrate (D) is used to control the level in condenser drum, for the extractive middle vessel batch distillation column.

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16
Q:

Liquid flow out of middle vessel (LM) is used to control?

A) 2/E B) 7/E
C) 8/E D) 1/E
 
Answer & Explanation Answer: A) 2/E

Explanation: Liquid flow out of middle vessel (LM) is used to control the 2/E split in the stripping section, for the extractive middle vessel batch distillation column.

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18
Q:

Entrainer feed flowrate (E), is used to control?

A) 5/6 split B) 7/8 split
C) ½ split D) ¾ split
 
Answer & Explanation Answer: C) ½ split

Explanation: Entrainer feed flowrate (E) is used to control the 1/2 split in the extractive section for the extractive middle vessel batch distillation column.

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18
Q:

Liquid reflux (L1), is used to control?

A) 1/E split B) 1/2E split
C) 1/5E split D) E split
 
Answer & Explanation Answer: A) 1/E split

Explanation: Liquid reflux (L1) is used to control the 1/E split in the rectifying section for the extractive middle vessel batch distillation column.

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20
Q:

High reflux “weakens”, the effect of the?

A) Stages B) Trays
C) Entrainer D) Plates
 
Answer & Explanation Answer: C) Entrainer

Explanation: High reflux “weakens” the effect of the entrainer (E), there is a minimum and a maximum reflux ratio in order to achieve acceptable separation between component 1 and E.

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