65 + Interview Questions in Key Fractionation Concepts in Distillation Design Page 1 InterviewSolution

1.	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 recoveredThe question was posed to me in my homework.Question is from Computer Simulation Result Analysis in division Key Fractionation Concepts of Distillation Design
Answer» The correct option is (B) RECOVERED in the bottom STREAM Easiest explanation: COMPONENTS heavier than the heavy key are FINALLY separated at bottom stream and light key at the top.

Discussion

2.	Slope of rectifying line is given by(a) R/XD(b) R/(R+1)(c) F/ (D+W)(d) R/(R+1)The question was asked in semester exam.My question is from Mccabe Thiele Diagram-Construction topic in section Key Fractionation Concepts of Distillation Design
Answer» Correct option is (b) R/(R+1) The BEST EXPLANATION: The rectifying LINE slope is always given as ratio of Reflux ratio plus UNITY i.e. R/(R+1), While R/XD gives us the reflux to liquid ratio for the OPERATION.

Discussion

3.	The equilibrium line is plotted on the graph at(a) Middle of both sections(b) 900from stripping section(c) 450from axis meet up(d) At meetup of axisI got this question in an interview for job.The query is from Constant Molar Overflow and Other Assumptions topic in section Key Fractionation Concepts of Distillation Design
Answer» Right OPTION is (c) 450from axis MEET up Best EXPLANATION: Equilibrium line is always plotted between axes at 450, while the 90 0 perpendicular is used to find the feed point on x-y graph.

Discussion

4.	More volatile keys are defined as(a) Heavy key (H)(b) Over Key (O)(c) Light Key (L)(d) Down comer Key (D)I got this question in quiz.This key question is from Computer Simulation Result Analysis in portion Key Fractionation Concepts of Distillation Design
Answer» The correct CHOICE is (C) Light KEY (L) For explanation: KEYS must differ in volatility more volatile is the Light Key (L), while the less volatile keys are DEFINED as Heavy key (H).

Discussion

5.	Consider the following data, L’ = 363 and slope of section is 1.55. Estimate Vapor flow rate on either side(a) 234(b) 284(c) 303(d) 456I had been asked this question during an interview.This question is from Constant Molar Overflow and Other Assumptions topic in division Key Fractionation Concepts of Distillation Design
Answer» CORRECT OPTION is (a) 234 Best explanation: The slope is GIVEN by L’/V’=1.55, V’ = 363/1.55 = 234.

Discussion

6.	If F= 200 kmol/h and ZF=0.4, XD=0.95, XW=0.04 and R=2.0, Then D is(a) 88.1(b) 22.6(c) 79.1(d) 158.2The question was asked during an interview for a job.My question is from Mccabe Thiele Diagram-Construction in portion Key Fractionation Concepts of Distillation Design
Answer» Right OPTION is (c) 79.1 Explanation: USING equation FzF= DXD + Wxw substituting VALUES we get D=79.1.

Discussion

7.	Which of the following model is best for computer simulation?(a) Auto Model(b) HYSYS Model(c) Cremer Model(d) Two parameter modelThe question was asked in homework.My enquiry is from Computer Simulation Result Analysis in portion Key Fractionation Concepts of Distillation Design
Answer» RIGHT choice is (b) HYSYS Model The explanation: For computer simulation HYSYS Model is widely USED, auto model is used to DESIGN automobiles, WHEREAS two parameter model is used in REACTION operations.

Discussion

8.	Gilliland’s x intercept is given as(a) Rmin/R+1(b) R/R+1(c) Nmin/R+1(d) R-Rmin/R+1This question was posed to me at a job interview.Asked question is from Key Components of Multi component Distillation topic in division Key Fractionation Concepts of Distillation Design
Answer» Right option is (d) R-Rmin/R+1 For explanation: Gilliland represented correlation GRAPHICALLY as R-Rmin/R+1 on X AXIS, where R is the reflux ratio of the SYSTEM.

Discussion

9.	Calculate Boil up? If vapor flow and bottom withdrawal are 237.3 and 120.9 respectively(a) 1.5(b) 2.9(c) 2.111(d) 1.963I have been asked this question during an internship interview.My doubt stems from Mccabe Thiele Diagram-Construction in section Key Fractionation Concepts of Distillation Design
Answer» RIGHT answer is (d) 1.963 The EXPLANATION is: As boil up is ratio of VAPOR FLOW and bottom WITHDRAWAL then 237.3/120.9 = 1.963.

Discussion

10.	If xD=0.95, xW= 0.04 and α=2.5. Find total trays?(a) 7(b) 6.7(c) 7.7(d) 6I have been asked this question in homework.The question is from Mccabe Thiele Diagram-Construction topic in division Key Fractionation Concepts of Distillation Design
Answer» CORRECT answer is (b) 6.7 The explanation: Using FENSKE’s equation total number of trays to be CALCULATE are5.7 as NM + 1 then 5.7+1 = 6.7 which is the final answer.

Discussion

11.	The real number of trays are obtained as ratio of(a) Number of ideal trays and flow rate(b) Number of ideal trays and efficiency(c) Number of ideal trays and reflux ratio(d) Number of ideal trays and stripping ratioThis question was posed to me in an interview for job.Question is taken from Mccabe Thiele Diagram-Line Equation topic in chapter Key Fractionation Concepts of Distillation Design
Answer» RIGHT answer is (b) Number of IDEAL TRAYS and efficiency Easiest explanation: Number of ideal trays divided by the TRAY efficiency gives us the real number of trays, Number of ideal trays and reflux ratio gives us the ease of separation.

Discussion

12.	The liquid rich section in a distillation column is called as(a) Boil up section(b) Reflux section(c) Stripping Section(d) Enriching SectionThe question was posed to me in an internship interview.I'm obligated to ask this question of Mccabe Thiele Diagram-Fundamentals topic in section Key Fractionation Concepts of Distillation Design
Answer» The correct CHOICE is (c) STRIPPING Section The best explanation: The PART below the feed tray is ENRICHED with liquid feed which is called as Stripping Section and contains only liquid at the column TEMPERATURE.

Discussion

13.	The overall Energy balance of a column is given by(a) V1HV1 = L0HL0 + DHD + QC(b) QC = V1HV1(c) V1HV1 = DHD + H0(d) Can change with modelsI got this question at a job interview.This is a very interesting question from Mccabe Thiele Diagram-Fundamentals topic in chapter Key Fractionation Concepts of Distillation Design
Answer» Correct option is (a) V1HV1 = L0HL0 + DHD + QC Easy explanation: The energy BALANCE equation is GIVEN as V1HV1 = L0HL0 + DHD + QC, where Qc is the heat provided through reboiler.

Discussion

14.	Gilliland Correlation is arranged to estimate the(a) Numbers of Stages(b) Numbers of Reboiler(c) Numbers of Feed(d) Numbers of ColumnThis question was posed to me in my homework.My question is taken from Key Components of Multi component Distillation in portion Key Fractionation Concepts of Distillation Design
Answer» The correct ANSWER is (a) NUMBERS of Stages To EXPLAIN I would say: Gilliland Correlation is arranged to estimate the Numbers of Stages at FINITE reflux ratio, while reboiler is only a unit piece of set.

Discussion

15.	The vapor rich section in the distillation column is called as(a) Rectifying Section(b) Boiling section(c) Stripping Section(d) Leaching sectionThe question was posed to me in an interview for job.My query is from Mccabe Thiele Diagram-Fundamentals topic in division Key Fractionation Concepts of Distillation Design
Answer» CORRECT option is (a) RECTIFYING Section The explanation is: The PART above the feed tray is RICH in VAPOR which is called as rectifying or enriching section and contains only vapor in equilibrium with liquid.

Discussion

16.	The vapor rich section in the distillation column is called as(a) Rectifying Section(b) Boiling section(c) Stripping Section(d) Leaching sectionI had been asked this question in an online interview.My doubt is from Mccabe Thiele Diagram-Fundamentals topic in portion Key Fractionation Concepts of Distillation Design
Answer»

Discussion

17.	Gilliland Correlation is arranged to estimate the(a) Numbers of Stages(b) Numbers of Reboiler(c) Numbers of Feed(d) Numbers of ColumnThe question was asked in my homework.Origin of the question is Key Components of Multi component Distillation topic in division Key Fractionation Concepts of Distillation Design
Answer»

Discussion

18.	If ZF¬=0.58 and also feed contains 35% mole of the liquid, then intercept of y axis is(a) 0.892(b) 0.205(c) 0.707(d) Can’t be calculatedThe question was posed to me in exam.My question is based upon Mccabe Thiele Diagram-Construction in division Key Fractionation Concepts of Distillation Design
Answer» RIGHT ANSWER is (a) 0.892 The EXPLANATION: As – (ZF/q-1) USING VALUES -0.58/ (0.35-1) = 0.892.

Discussion

19.	If the D -> 0, then the condition is called as(a) Total Boil up(b) No distillation(c) No Separation(d) Total RefluxThis question was addressed to me in my homework.I need to ask this question from Mccabe Thiele Diagram-Line Equation topic in division Key Fractionation Concepts of Distillation Design
Answer» Right option is (d) Total Reflux To EXPLAIN: When D tends to zero no product is WITHDRAWN which is called as total reflux, and when D-> infinity this is called total BOIL up.

Discussion

20.	If the ideal trays are 7.7 and the efficiency of each one is 0.5, then real number of trays are(a) 15.4(b) 14.1(c) 15.0(d) 18.5This question was addressed to me in a job interview.My question comes from Mccabe Thiele Diagram-Line Equation in chapter Key Fractionation Concepts of Distillation Design
Answer» The CORRECT CHOICE is (a) 15.4 For EXPLANATION: The REAL number of TRAYS are 7.7/0.5 = 15.4.

Discussion

21.	The equilibrium curve of the column is given as(a) yn=x(b) y*=x(c) yn+1=xn(d) xn+1=yThis question was addressed to me in my homework.I'd like to ask this question from Mccabe Thiele Diagram-Fundamentals in section Key Fractionation Concepts of Distillation Design
Answer» The correct answer is (C) yn+1=xn Easiest explanation: The equilibrium curve is the LOCUS of all equilibrium POINT given as yn+1=xn, while y*=x REPRESENTS the equilibrium relation of gas and liquid.

Discussion

22.	The feed of a distillation column is related to be a(a) Binary mixture(b) Urinary mixture(c) Mixture of phases(d) Tertiary MixtureThis question was posed to me by my school teacher while I was bunking the class.My question comes from Mccabe Thiele Diagram-Fundamentals in division Key Fractionation Concepts of Distillation Design
Answer» Correct choice is (d) TERTIARY MIXTURE Easy explanation: Mixture of PHASES i.e. two phase mixture is necessary for distillation, EITHER it can be a multicomponent mixture as per required conditions.

Discussion

23.	Which of following is an important assumption of McCabe Thiele method?(a) Heat loss is maximum(b) Heat loss is negligible(c) Heat loss is infinite(d) Can’t be specifiedI had been asked this question in an interview for internship.I'm obligated to ask this question of Constant Molar Overflow and Other Assumptions in section Key Fractionation Concepts of Distillation Design
Answer» Right OPTION is (b) Heat loss is NEGLIGIBLE To explain: The major ASSUMPTION of McCabe Thiele METHOD is Heat loss is negligible and also an overhead reboiler and condenser are used to recover heat loss.

Discussion

24.	Calculate minimum reflux? If intercept is 0.56 and XD= 0.96(a) 0.174(b) 0.125(c) 0.21(d) 0.28The question was posed to me in final exam.My question is based upon Mccabe Thiele Diagram-Construction topic in portion Key Fractionation Concepts of Distillation Design
Answer» CORRECT ANSWER is (a) 0.174 To ELABORATE: As 0.56=XD/ (RM+1) = 0.96/ (RM+1) M= 0.174.

Discussion

25.	For identifying misallocated feed stages, which of the following is used?(a) Key Ratios(b) Molar Ratios(c) Reflux Ratios(d) Feed RatiosI have been asked this question during an interview.I would like to ask this question from Computer Simulation Result Analysis topic in division Key Fractionation Concepts of Distillation Design
Answer» The CORRECT option is (a) Key RATIOS Best EXPLANATION: Misallocated feed stages are identified USING Key Ratios, while separation are identified using the feed ratios.

Discussion

26.	Optimum feed-stage location, can be obtained by using(a) Gilliland correlation(b) Kirk bride correlation(c) Fenske’s correlation(d) Sorel’s correlationThe question was posed to me in an online interview.The query is from Key Components of Multi component Distillation topic in chapter Key Fractionation Concepts of Distillation Design
Answer» Right OPTION is (b) KIRK bride correlation For explanation: An approximate optimum feed-stage LOCATION, can be obtained by Equation of Kirk bride correlation while Gilliland correlation is used to plot INTERCEPTS.

Discussion

27.	For multi-component systems, Underwood Equations gives(a) Minimum Reflux(b) Minimum Strip(c) Maximum Reflux(d) Minimum TraysThis question was addressed to me during an online interview.Question is taken from Key Components of Multi component Distillation topic in division Key Fractionation Concepts of Distillation Design
Answer» Correct choice is (a) MINIMUM Reflux Explanation: Underwood Equations GIVES Minimum Reflux, FENSKE’s equation gives minimum TRAYS and MCCABE gives us minimum Reflux.

Discussion

28.	Sometime the reboiler is also considered as the(a) Reflux item(b) Extra equity(c) Heat extractor(d) Extra StageI had been asked this question in final exam.The query is from Mccabe Thiele Diagram-Line Equation in portion Key Fractionation Concepts of Distillation Design
Answer» The correct OPTION is (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.

Discussion

29.	The method of construction of an x-y diagram was explained by(a) Richardson and Coulson(b) Robinson and Gilliland(c) Murphree and Fenske(d) Cremer and PullongThis question was posed to me in an online interview.Asked question is from Constant Molar Overflow and Other Assumptions topic in chapter Key Fractionation Concepts of Distillation Design
Answer» Right option is (b) Robinson and Gilliland Best explanation: Pseudo PROPERTIES were given by Robinson and Gilliland, while MURPHREE and Fenske gave EQUATIONS to calculate trays and efficiency respectively.

Discussion

30.	8) In McCabe Thiele method, equilibrium line is drawn between(a) x-y(b) y-x(c) x- y(d) y-xI have been asked this question in a job interview.Origin of the question is Constant Molar Overflow and Other Assumptions in section Key Fractionation Concepts of Distillation Design
Answer» The CORRECT option is (a) X-y To ELABORATE: The equilibrium is always drawn between x-y MOLE ratios, where x is mole of liquid feed and y is the mole of gas at equilibrium CONDITIONS.

Discussion

31.	Key ratios and stages are plotted on which scale?(a) Binary scale(b) Exponential Scale(c) Semi log scale(d) Pressure scaleThe question was posed to me in an interview for internship.Question is taken from Computer Simulation Result Analysis topic in division Key Fractionation Concepts of Distillation Design
Answer» Right answer is (c) Semi log scale Easiest explanation: KEY ratios and STAGES are PLOTTED on Semi log scale, and EQUILIBRIUM relation are plotted on binary scale.

Discussion

32.	If the fractional recovery of light key in the distillate is FR, then light key in the feed is(a) DxD= (FRD)+FxLK(b) DxD= (FRD)/FxLK(c) DxD= (FRD)FxLK(d) DxD= (FRD)I have been asked this question by my school principal while I was bunking the class.The origin of the question is Key Components of Multi component Distillation topic in portion Key Fractionation Concepts of Distillation Design
Answer» Correct OPTION is (c) DXD= (FRD)FXLK Easy EXPLANATION: The definition of the fractional RECOVERY is DxD= (FRD) FxLK, while gives us the material balance on feed and distillate DxD= (FRD).

Discussion

33.	In the Fenske’s equation, xw and yw are(a) Equilibrium liquid and vapor concentration(b) Equilibrium distilled content(c) Partial vapor concentrations of liquid and solid(d) Total vapor and liquid rateI had been asked this question by my school teacher while I was bunking the class.This interesting question is from Mccabe Thiele Diagram-Line Equation topic in division Key Fractionation Concepts of Distillation Design
Answer» The correct choice is (a) Equilibrium liquid and VAPOR CONCENTRATION The best I can EXPLAIN: Fenske’s equation makes use of equilibrium liquid and vapor concentration, Equilibrium distilled CONTENT is used by the McCabe Thiele METHOD.

Discussion

34.	In multicomponent distillation, the separation of components is calculated using(a) Assumed flows of species(b) Assumed flows of reflux(c) Assumed flows of Vapor(d) Assumed flows of liquidThis question was posed to me in homework.This key question is from Key Components of Multi component Distillation topic in section Key Fractionation Concepts of Distillation Design
Answer» CORRECT option is (c) Assumed flows of Vapor To explain I WOULD SAY: The number of plates above and below the feed is assumed, and the separation is calculated using assumed REFLUX.

Discussion

35.	For the light key component, Equilibrium relation is(a) yK=x(b) Kx=y(c) Depend upon trays(d) Can’t be specifiedI have been asked this question by my school principal while I was bunking the class.I want to ask this question from Key Components of Multi component Distillation topic in division Key Fractionation Concepts of Distillation Design
Answer» The correct choice is (a) yK=x To EXPLAIN I would say: Here Kx=y is the equilibrium relation, which does not depends upon the number of TRAYS or the VICE versa relation i.e.Kx=y REPRESENTING x and y moles of gas and fluid.

Discussion

36.	If feed is saturated vapor, then(a) q = 1(b) q= 0.5(c) q= 0(d) q= infiniteThis question was posed to me in an interview for job.I would like to ask this question from Mccabe Thiele Diagram-Line Equation in portion Key Fractionation Concepts of Distillation Design
Answer» Right choice is (c) q= 0 To explain: When the feed is saturated vapor then LINES passes through (zF,zF) i.e. q = 0, when q is infinite the feed is TOTALLY WITHDRAWN.

Discussion

37.	If R=1.5 and xd= 0.96, then intercept of enriching line is estimated as(a) 0.384(b) 0.234(c) 0.5(d) 0.96This question was posed to me during an online exam.I need to ask this question from Mccabe Thiele Diagram-Line Equation topic in portion Key Fractionation Concepts of Distillation Design
Answer» The CORRECT ANSWER is (a) 0.384 To EXPLAIN: As xD/R+1 = 0.96/1.5+1 =0.384.

Discussion

38.	McCabe Thiele is based on the assumption?(a) Constant molar overflow(b) Constant reflux ratio(c) Volatile products are used for better separation(d) Boil up ratio is infinityThis question was addressed to me during a job interview.My enquiry is from Mccabe Thiele Diagram-Fundamentals topic in division Key Fractionation Concepts of Distillation Design
Answer» RIGHT choice is (a) Constant molar overflow The BEST EXPLANATION: The best ASSUMPTION of the McCabe Method is it is based on Constant molar overflow, while heat DUTIES are neglected in the method.

Discussion

39.	Optimum reflux ratio ranges between(a) 2 to 5(b) 2 to 3(c) 1.0 to 1 .5(d) 1.0 to 2.5I got this question during an online interview.Origin of the question is Theoretical Stages topic in chapter Key Fractionation Concepts of Distillation Design
Answer» The CORRECT OPTION is (c) 1.0 to 1 .5 Easy explanation: Best optimum reflux is between ranges. 1.0

Discussion

40.	The component balance of the component A is given as(a) FzF= DxD + Wxw(b) FzF= DxD – Wxw(c) FzF= DxD/Wxw(d) FzF= DxD *WxwThis question was posed to me in an online interview.The question is from Mccabe Thiele Diagram-Construction topic in chapter Key Fractionation Concepts of Distillation Design
Answer» Right option is (a) FzF= DXD + WXW To elaborate: According to McCabe Thiele method MATERIAL balance over is GIVEN as FzF= DxD + Wxw, where F is the TOTAL feed.

Discussion

41.	The overall material balance of the tower is given by(a) L= V+W(b) F=D+W(c) D= F+HD(d) D= V+HDI got this question during an interview for a job.The query is from Mccabe Thiele Diagram-Line Equation in portion Key Fractionation Concepts of Distillation Design
Answer» The correct option is (b) F=D+W Explanation: The overall MATERIAL BALANCE EQUATION is given as F=D+W where F is the flow rate, D is the DISTILLATE and W is the withdrawn product.

Discussion

42.	Separation of a volatile mixture of relatively pure products, is done in a(a) Steam distillation(b) Fractionating Column(c) Flash Distillation(d) Depending of product requiredI have been asked this question during an internship interview.My question comes from Mccabe Thiele Diagram-Fundamentals in portion Key Fractionation Concepts of Distillation Design
Answer» The correct option is (d) Depending of product required The explanation is: The SEPARATION ALWAYS depends on the quality of product required INDEPENDENT of operation required.

Discussion

43.	The condition where reflux and stripping ratio approaches to infinity is called as(a) Minimum reflux(b) Total reflux(c) Optimum ratio(d) Feed ratioThe question was posed to me by my school teacher while I was bunking the class.This intriguing question originated from Constant Molar Overflow and Other Assumptions topic in section Key Fractionation Concepts of Distillation Design
Answer» Right option is (b) TOTAL reflux The EXPLANATION is: Both balance lines approaches to COINCIDE such a condition is called Total reflux, the slope of rectifying and stripping LINE MATCHES each other.

Discussion

44.	d/b plots are used when there is(a) Non key components(b) Total reflux(c) Boil up required(d) Can’t be specifiedI have been asked this question in final exam.My question comes from Computer Simulation Result Analysis in division Key Fractionation Concepts of Distillation Design
Answer» The correct ANSWER is (a) Non key components For EXPLANATION: The d/b PLOTS are USED when there is tight SPACING on non-key components, while full withdrawal of product is called as total reflux.

Discussion

45.	If ZF=0.6 and also feed contains 72% mole of the liquid, then intercept of x axis is(a) 0.744(b) 0.899(c) 0.833(d) 1.2I have been asked this question by my college director while I was bunking the class.My question is taken from Mccabe Thiele Diagram-Construction topic in division Key Fractionation Concepts of Distillation Design
Answer» The CORRECT CHOICE is (C) 0.833 To EXPLAIN I would say: As (ZF/q) using values 0.6/ (0.72) = 0.833.

Discussion

46.	In which case Constant Molar overflow is true?(a) Equimolar counter diffusion(b) Equimolar co-current diffusion(c) Distinct overflow(d) Not Sure of DiffusionI got this question by my school teacher while I was bunking the class.Asked question is from Constant Molar Overflow and Other Assumptions in chapter Key Fractionation Concepts of Distillation Design
Answer» CORRECT OPTION is (a) Equimolar COUNTER diffusion The best I can explain: CMO is totally based on the assumption of equal-molar counter diffusion, mainly used in the CALCULATION of trays in the McCabe Thiele method.

Discussion

47.	d/b plots are also called as(a) Key plots(b) Mole plots(c) Reflux plots(d) Non Key plotsI have been asked this question by my college professor while I was bunking the class.I want to ask this question from Computer Simulation Result Analysis topic in portion Key Fractionation Concepts of Distillation Design
Answer» CORRECT option is (a) KEY PLOTS The best I can explain: They are called as key plots always, where d is the higher key representative and b the LOWER ONE.

Discussion

48.	Gilliland’s y intercept is given as(a) Nmin/N+1(b) N-Nmin/N+1(c) N+Nmin/N+1(d) N/N+1I got this question in final exam.Query is from Key Components of Multi component Distillation in portion Key Fractionation Concepts of Distillation Design
Answer» Right answer is (b) N-Nmin/N+1 For EXPLANATION: GILLILAND represented correlation GRAPHICALLY as, N-Nmin/N+1 on y axis, where N is the number of STAGES.

Discussion

49.	The very First step of McCabe method is?(a) Plot the equilibrium curve(b) Plot diagonal curve(c) Plot Operating line(d) Plot stripping lineThis question was posed to me by my college professor while I was bunking the class.This interesting question is from Mccabe Thiele Diagram-Construction topic in section Key Fractionation Concepts of Distillation Design
Answer» CORRECT option is (a) PLOT the equilibrium curve Easiest explanation: FIRSTLY we plot the Equilibrium diagram from the given equilibrium DATA, then the diagonal curve and then plot the operating line.

Discussion

50.	For an infinite number of plates required, the desired separation(a) Hardly possible(b) Finely possible(c) Can’t be specified(d) AssumableThe question was asked by my school principal while I was bunking the class.The origin of the question is Computer Simulation Result Analysis topic in chapter Key Fractionation Concepts of Distillation Design
Answer» Correct answer is (a) Hardly POSSIBLE To EXPLAIN: At infinite PLATES for REFLUX ratio, the desired separation is just barely possible, while for fixed number of trays the separation can be assumed.

Discussion

Explore topic-wise InterviewSolutions in .

Slope of rectifying line is given by(a) R/XD(b) R/(R+1)(c) F/ (D+W)(d) R/(R+1)The question was asked in semester exam.My question is from Mccabe Thiele Diagram-Construction topic in section Key Fractionation Concepts of Distillation Design

More volatile keys are defined as(a) Heavy key (H)(b) Over Key (O)(c) Light Key (L)(d) Down comer Key (D)I got this question in quiz.This key question is from Computer Simulation Result Analysis in portion Key Fractionation Concepts of Distillation Design

If F= 200 kmol/h and ZF=0.4, XD=0.95, XW=0.04 and R=2.0, Then D is(a) 88.1(b) 22.6(c) 79.1(d) 158.2The question was asked during an interview for a job.My question is from Mccabe Thiele Diagram-Construction in portion Key Fractionation Concepts of Distillation Design

Which of the following model is best for computer simulation?(a) Auto Model(b) HYSYS Model(c) Cremer Model(d) Two parameter modelThe question was asked in homework.My enquiry is from Computer Simulation Result Analysis in portion Key Fractionation Concepts of Distillation Design

Gilliland’s x intercept is given as(a) Rmin/R+1(b) R/R+1(c) Nmin/R+1(d) R-Rmin/R+1This question was posed to me at a job interview.Asked question is from Key Components of Multi component Distillation topic in division Key Fractionation Concepts of Distillation Design

Calculate Boil up? If vapor flow and bottom withdrawal are 237.3 and 120.9 respectively(a) 1.5(b) 2.9(c) 2.111(d) 1.963I have been asked this question during an internship interview.My doubt stems from Mccabe Thiele Diagram-Construction in section Key Fractionation Concepts of Distillation Design

If xD=0.95, xW= 0.04 and α=2.5. Find total trays?(a) 7(b) 6.7(c) 7.7(d) 6I have been asked this question in homework.The question is from Mccabe Thiele Diagram-Construction topic in division Key Fractionation Concepts of Distillation Design

If ZF¬=0.58 and also feed contains 35% mole of the liquid, then intercept of y axis is(a) 0.892(b) 0.205(c) 0.707(d) Can’t be calculatedThe question was posed to me in exam.My question is based upon Mccabe Thiele Diagram-Construction in division Key Fractionation Concepts of Distillation Design

If the ideal trays are 7.7 and the efficiency of each one is 0.5, then real number of trays are(a) 15.4(b) 14.1(c) 15.0(d) 18.5This question was addressed to me in a job interview.My question comes from Mccabe Thiele Diagram-Line Equation in chapter Key Fractionation Concepts of Distillation Design

The equilibrium curve of the column is given as(a) yn=x(b) y*=x(c) yn+1=xn(d) xn+1=yThis question was addressed to me in my homework.I'd like to ask this question from Mccabe Thiele Diagram-Fundamentals in section Key Fractionation Concepts of Distillation Design

Calculate minimum reflux? If intercept is 0.56 and XD= 0.96(a) 0.174(b) 0.125(c) 0.21(d) 0.28The question was posed to me in final exam.My question is based upon Mccabe Thiele Diagram-Construction topic in portion Key Fractionation Concepts of Distillation Design

Sometime the reboiler is also considered as the(a) Reflux item(b) Extra equity(c) Heat extractor(d) Extra StageI had been asked this question in final exam.The query is from Mccabe Thiele Diagram-Line Equation in portion Key Fractionation Concepts of Distillation Design

8) In McCabe Thiele method, equilibrium line is drawn between(a) x-y(b) y-x(c) x*- y(d) y*-xI have been asked this question in a job interview.Origin of the question is Constant Molar Overflow and Other Assumptions in section Key Fractionation Concepts of Distillation Design

If feed is saturated vapor, then(a) q = 1(b) q= 0.5(c) q= 0(d) q= infiniteThis question was posed to me in an interview for job.I would like to ask this question from Mccabe Thiele Diagram-Line Equation in portion Key Fractionation Concepts of Distillation Design

If R=1.5 and xd= 0.96, then intercept of enriching line is estimated as(a) 0.384(b) 0.234(c) 0.5(d) 0.96This question was posed to me during an online exam.I need to ask this question from Mccabe Thiele Diagram-Line Equation topic in portion Key Fractionation Concepts of Distillation Design

Optimum reflux ratio ranges between(a) 2 to 5(b) 2 to 3(c) 1.0 to 1 .5(d) 1.0 to 2.5I got this question during an online interview.Origin of the question is Theoretical Stages topic in chapter Key Fractionation Concepts of Distillation Design

The component balance of the component A is given as(a) FzF= DxD + Wxw(b) FzF= DxD – Wxw(c) FzF= DxD/Wxw(d) FzF= DxD *WxwThis question was posed to me in an online interview.The question is from Mccabe Thiele Diagram-Construction topic in chapter Key Fractionation Concepts of Distillation Design

The overall material balance of the tower is given by(a) L= V+W(b) F=D+W(c) D= F+HD(d) D= V+HDI got this question during an interview for a job.The query is from Mccabe Thiele Diagram-Line Equation in portion Key Fractionation Concepts of Distillation Design

d/b plots are used when there is(a) Non key components(b) Total reflux(c) Boil up required(d) Can’t be specifiedI have been asked this question in final exam.My question comes from Computer Simulation Result Analysis in division Key Fractionation Concepts of Distillation Design

Gilliland’s y intercept is given as(a) Nmin/N+1(b) N-Nmin/N+1(c) N+Nmin/N+1(d) N/N+1I got this question in final exam.Query is from Key Components of Multi component Distillation in portion Key Fractionation Concepts of Distillation Design

8) In McCabe Thiele method, equilibrium line is drawn between(a) x-y(b) y-x(c) x- y(d) y-xI have been asked this question in a job interview.Origin of the question is Constant Molar Overflow and Other Assumptions in section Key Fractionation Concepts of Distillation Design