Distillation Design Mcqs

Q:

Components heavier than the heavy key are finally

A) Recovered in the Condenser B) Recovered in the bottom stream
C) Recovered in the Upsides stream D) Not recovered
 
Answer & Explanation Answer: B) Recovered in the bottom stream

Explanation: Components heavier than the heavy key are finally separated at bottom stream and light key at the top.

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Q:

When the temperature is plotted against the equilibrium vapor, then it is called

A) Condensing Curve B) Dew Point curve
C) Equilibrium Curve D) Bubble Curve
 
Answer & Explanation Answer: B) Dew Point curve

Explanation: The (T-y*) curve is called as Dew point Curve, Where T is boiling temperature, and y is the equilibrium moles of the gaseous components.

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61
Q:

An azeotrope occurs, when there is same _______

A) Bubble Point B) Boiling Point
C) VLE Composition D) Pressure Equilibrium
 
Answer & Explanation Answer: C) VLE Composition

Explanation: An azeotrope occurs when the composition of a vapor in equilibrium with a liquid mixture has the same composition as the liquid.

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59
Q:

Sometime the reboiler is also considered as the

A) Reflux item B) Extra equity
C) Heat extractor D) Extra Stage
 
Answer & Explanation Answer: D) Extra Stage

Explanation: The reboiler is sometimes used as an extra stage of operation of distillation, because the heat dissipated is also considered in the calculation of trays.

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Q:

Gilliland Correlation is arranged to estimate the

A) Numbers of Stages B) Numbers of Reboiler
C) Numbers of Feed D) Numbers of Column
 
Answer & Explanation Answer: A) Numbers of Stages

Explanation: Gilliland Correlation is arranged to estimate the Numbers of Stages at finite reflux ratio, while reboiler is only a unit piece of set.

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53
Q:

Molecular Distillation is

A) For heat sensitive materials B) Very low pressure distillation
C) High low pressure distillation D) Purge pressure
 
Answer & Explanation Answer: B) Very low pressure distillation

Explanation: Molecular Distillation is done for very low pressure distillation operations, while batch distillation occurs at high pressure and temperatures.

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48
Q:

Which system can be said as an Ideal system that obeys?

A) Henrys Law B) Daltons Law
C) Phase Rule D) Cremer’s rule
 
Answer & Explanation Answer: D) Cremer’s rule

Explanation: The system that obeys Henry’s and Dalton’s Law is called an ideal system, as they are derived from the ideal gas relation PV=Nrt.

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Q:

For an infinite number of plates required, the desired separation

A) Hardly possible B) Finely possible
C) Can’t be specified D) Assumable
 
Answer & Explanation Answer: A) Hardly possible

Explanation: At infinite plates for reflux ratio, the desired separation is just barely possible, while for fixed number of trays the separation can be assumed.

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