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51.	For Multicomponent Mixtures Equilibria depend on ?(a) Pressure(b) Temperature(c) Humidity(d) EnthalpyI had been asked this question by my school teacher while I was bunking the class.This interesting question is from Key Components of Multi component Distillation in portion Key Fractionation Concepts of Distillation Design
Answer» RIGHT option is (b) Temperature The BEST explanation: It DEPENDS on T, which CHANGES from stage to stage, Pressure is not the deciding criteria as it can vary from Colum to column.

52.	For computer simulation, considerations were defined by(a) Richardson and Coulson(b) Robinson and Gilliland(c) Murphree and Fenske(d) Johnson and MorganI got this question in unit test.My question is from Computer Simulation Result Analysis topic in section Key Fractionation Concepts of Distillation Design
Answer» Correct answer is (d) Johnson and Morgan To elaborate: KEY CONSIDERATIONS were defined by Johnson and Morgan and Robinson and Gilliland gave the correlation of stages and Richardson and COULSON are famous chemical ENGINEERING AUTHORS.

53.	The feed line equation is given by(a) F – L = q(b) L’ – L = qF(c) V – V’ =F(d) F = L – VI have been asked this question during a job interview.My question is taken from Mccabe Thiele Diagram-Fundamentals in division Key Fractionation Concepts of Distillation Design
Answer» RIGHT option is (B) L’ – L = qF Easy explanation: The feed line equation is L’ – L = QF where Q is the product of quantity of liquid CONTAINED in feed.

54.	The point where equilibrium curve and component balance meets is called as(a) Murphree point.(b) Intersection point(c) Junction point(d) Pinch pointI have been asked this question in semester exam.This question is from Constant Molar Overflow and Other Assumptions in portion Key Fractionation Concepts of Distillation Design
Answer» RIGHT choice is (d) Pinch point The best I can EXPLAIN: At infinite STAGES the where EQUILIBRIUM curve and component balance meets is CALLED as pinch point.

55.	HETP is defined?(a) Height equivalent to theoretical plate(b) High efficiency tower plate(c) High energy temperature point(d) Homotomy Engineer Temperature PointI have been asked this question in an interview.Question is from Constant Molar Overflow and Other Assumptions in portion Key Fractionation Concepts of Distillation Design
Answer» Correct choice is (a) HEIGHT equivalent to theoretical PLATE The explanation is: HETP is Height equivalent to theoretical plate, also DEFINED as ratio of HTU (height of transfer units) and NTU.

56.	If stages are fixed, then Reflux ratio(a) Decreases(b) Increases(c) Equates to 0(d) Approaches infinity.The question was asked at a job interview.Question is taken from Theoretical Stages in section Key Fractionation Concepts of Distillation Design
Answer» Correct choice is (b) Increases Easy explanation: The stages and the REFLUX ratio are directly proportional, while when it APPROACHES to 0 the distillate is not WITHDRAWN and if INFINITE all feed is withdrawn.

57.	If the feed is saturated liquid, then(a) q = 1(b) q= 0.1(c) q = F(d) q= 0The question was asked in an international level competition.This is a very interesting question from Mccabe Thiele Diagram-Line Equation in division Key Fractionation Concepts of Distillation Design
Answer» Correct choice is (a) Q = 1 The best explanation: When the FEED is saturated LIQUID with a VERTICAL LINE which then lines passes through (zF,zF) i.e. q = 0.

58.	If the liquid flow rate is 212 and vapor flow rate is 284, then the slope of rectifying section is?(a) 0.55(b) 0.89(c) 1.33(d) 0.75This question was addressed to me by my college professor while I was bunking the class.I would like to ask this question from Mccabe Thiele Diagram-Fundamentals topic in division Key Fractionation Concepts of Distillation Design
Answer» CORRECT CHOICE is (d) 0.75 Easy EXPLANATION: As SLOPE is GIVEN by L/V = 212/284 = 0.75.

59.	The boil up ratio can be defined as ratio of(a) V/L(b) D/V(c) V/W(d) L/WThe question was asked in an international level competition.This question is from Theoretical Stages topic in portion Key Fractionation Concepts of Distillation Design
Answer» The correct CHOICE is (c) V/W Best EXPLANATION: Boil up ratio is the ratio of VAPOR leaving the rebuilder to liquid at bottom product, also it is defined as the slope of stripping LINE.

60.	The external reflux ratio can be defined as(a) L0/D(b) D/L(c) D0/L(d) V/LThe question was asked in an interview.I would like to ask this question from Theoretical Stages in chapter Key Fractionation Concepts of Distillation Design
Answer» RIGHT answer is (d) V/L For explanation I WOULD say: The reflux RATIO is defined as the ratio of liquid flow rate and distilled flow rate, also this is called as the SLOPE of rectifying line.

61.	When Cooling is applied to condense a part of overhead product it is called(a) Reflux(b) Dew point(c) Boil Up(d) Relative BPThe question was posed to me during an interview.This key question is from Theoretical Stages in portion Key Fractionation Concepts of Distillation Design
Answer» Correct option is (a) Reflux The BEST EXPLANATION: Such operations is called as Rectifying stages and called Reflux, It is also called the RATIO of DISTILLATE and liquid flow rate.

62.	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 pressureI have been asked this question by my college director while I was bunking the class.The query is from Theoretical Stages in portion Key Fractionation Concepts of Distillation Design
Answer» The correct ANSWER is (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.

63.	Minimum number of trays can be calculated using(a) Bernoulli’s Eon(b) Henry’s Law(c) Fenske’s Equation(d) Homotomy EquationThis question was addressed to me in an international level competition.Query is from Theoretical Stages in chapter Key Fractionation Concepts of Distillation Design
Answer» Right OPTION is (c) Fenske’s Equation Explanation: MINIMUM NUMBER of trays can be EASILY calculated using Fenske’s equation with use of relative volatility.

64.	When rectifying and stripping both are combined in single stage process this is(a) Differentiation(b) Fractionation(c) Recycle(d) PurgingThis question was addressed to me in an international level competition.Enquiry is from Theoretical Stages topic in section Key Fractionation Concepts of Distillation Design
Answer» RIGHT answer is (b) Fractionation Easiest EXPLANATION: Such is an OPERATION is also called Fractional Distillation, The moles of the components reduce with RESPECT to time in this operation.

65.	When heat is supplied to bottom of liquid stage to vaporize a portion it is called(a) Condensing(b) Boil up(c) Cooling(d) DesaltingI had been asked this question in a national level competition.The question is from Theoretical Stages topic in portion Key Fractionation Concepts of Distillation Design
Answer» Correct ANSWER is (B) BOIL up To elaborate: Such operations USED in stripping section called as Boil up, the boiler is used as a heat exchanger to reheat the condensed liquid.