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1.	The K value can be expressed as(a) y/x(b) yi/x(c) x/y(d) yi/xiI got this question in exam.Enquiry is from Vapour Liquid Equilibrium in section Introduction to Distillation of Distillation Design
Answer» CORRECT CHOICE is (d) yi/xi For explanation I would SAY: The ratio of mole fraction of components in vapor and liquid PHASE is called as K value.

2.	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 CurveThe question was asked during an online interview.The query is from Vapour Liquid Equilibrium in portion Introduction to Distillation of Distillation Design
Answer» Correct option is (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.

3.	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 specifiedThis question was addressed to me in an online interview.The above asked question is from Vapour Liquid Equilibrium topic in division Introduction to Distillation of Distillation Design
Answer» Correct choice is (C) The higher the rate of separation The explanation: Volatility is DIRECTLY proportional to the ease of separation (α) while it is INVERSELY proportional to DIFFICULTY of separation.

4.	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 DiagramI had been asked this question in class test.My question is taken from Vapour Liquid Equilibrium in chapter Introduction to Distillation of Distillation Design
Answer»

5.	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-FThe question was posed to me in an internship interview.My question is taken from Vapour Liquid Equilibrium in section Introduction to Distillation of Distillation Design
Answer» Right option is (a) F=C-P+2 For EXPLANATION I would say: 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.

6.	Which system can be said as an Ideal system that obeys?(a) Henrys Law(b) Daltons Law(c) Phase Rule(d) Cremer’s ruleThe question was asked in an interview for internship.Question is from Vapour Liquid Equilibrium topic in portion Introduction to Distillation of Distillation Design
Answer» Right answer is (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.

7.	The Relative Volatility of components i and j can be defined as(a) Ki/Kj(b) K/Kj(c) yi/y(d) xi/xI had been asked this question in an interview for internship.My enquiry is from Vapour Liquid Equilibrium topic in section Introduction to Distillation of Distillation Design
Answer» CORRECT ANSWER is (a) Ki/Kj Easiest explanation: The RATIO of K VALUES is defined as the relative volatility, Where Ki is the gaseous COMPONENTS and Kj is the fluid components.

8.	Given that αAB=2.0, Then equilibrium ratio of B is KB=0.7, Estimate αBA ?(a) 0.9(b) 0.65(c) 0.5(d) 0.6This question was addressed to me in final exam.Asked question is from Vapour Liquid Equilibrium in division Introduction to Distillation of Distillation Design
Answer» The CORRECT ANSWER is (C) 0.5 Explanation: As α=KB/KA, 2.0= 0.7/KA, KA = 0.35 and αAB =KA/KB =0.35/0.7 = 0.5.

9.	VLE data once obtained is represented on which scale?(a) Binary Scale (0
Answer» The correct answer is (a) Binary Scale (0<X<1) For explanation: Binary scales are most SUITABLE as they represent MOLE fractions of the both SPECIES x* and y* at all conditions.