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Distillation Design Mcqs

Q:

An ideal distillation stage is the one that

A) Operates at steady state B) Operates at High temperature
C) Operates at Low pressure D) Operates at high pressure
 
Answer & Explanation Answer: A) Operates at steady state

Explanation: An ideal distillation stage operates at steady state has liquid product and vapor product, i.e. Liquid rate equals the gas flow rate.

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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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76
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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136
Q:

When the boiling temperature is plotted against the liquid composition, then it is called

A) Cooling Curve B) Heating Curve
C) Bubble point curve D) Volatility Phase Diagram
 
Answer & Explanation Answer: C) Bubble point curve

Explanation: The (T-x) curve is called as Bubble point Curve, Where T is boiling temperature and x is the mole fraction of the liquid.

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Q:

The higher the concentration of volatile species, the distillation

A) The higher the rate of liquid flow B) The lower the rate of Separation
C) The higher the rate of separation D) Cannot be specified
 
Answer & Explanation Answer: C) The higher the rate of separation

Explanation: Volatility is directly proportional to the ease of separation (?) while it is inversely proportional to difficulty of separation.

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78
Q:

Which of the following shows the correct Gibbs phase rule equation?

A) F=C-P+2 B) P=C+P
C) C=F-P+2 D) C=P-F
 
Answer & Explanation Answer: A) F=C-P+2

Explanation: According to Gibb’s F=C-P+2 for any system, where F is degree of freedom, C is number of components and P is the number of phases.

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