72 + Interview Questions in Column Process Design in Distillation Design Page 1 InterviewSolution

1.	According to smoker’s equation, C is given as(a) 1 + (α -1) k(b) 1 -(α -1)k(c) 1 -(α +1)k(d) α -1The question was asked in quiz.The query is from Analytical X-Y Diagram -Smoker’s Equation topic in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The correct OPTION is (a) 1 + (α -1) k Explanation: According to smoker’s EQUATION C is GIVEN as 1 + (α -1) k, where k VALUE is calculated from bottom and top sections of the COLUMN.

Discussion

2.	Jafarey Equation is an analytical closed form formula, to calculate(a) Reflux ratio(b) Number of trays(c) Number of stages(d) Number of feedsI had been asked this question in an international level competition.This intriguing question comes from The Jafarey, Dougles and Mcavoy Equation topic in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» CORRECT option is (b) Number of trays To EXPLAIN I would say: Jaffrey Equation is an analytical closed FORM formula to calculate Number of trays simplifying SMOKER’s equation.

Discussion

3.	If Component is non-distributed, then(a) DR >1(b) DR
Answer» The correct answer is (a) DR >1 The best I can EXPLAIN: If COMPONENT is non-distributed then DR >1 CONTAINED entirely distillate, while if COMPONENTS are distributed they are entirely withdrawn.

Discussion

4.	Most distillation columns are designed for reflux ratio between(a) 3 to 5Rmin(b) 1.2 and 1 .7 Rmin(c) 2to 10 Rmin(d) 0.2 to 0.7 RminThe question was asked in an interview for job.The above asked question is from Reflux Stage Relationships in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The correct OPTION is (b) 1.2 and 1 .7 RMIN Easiest explanation: This is the most SUITABLE for 1.2 and 1.7 Rmin times reflux ratio, this also reduces the operating and the final cost of the SYSTEM.

Discussion

5.	What does DCF represents?(a) Distillation Corp Factor(b) Damping Correction Factor(c) Down Comer Flow(d) Discounted Cash flowI have been asked this question during an internship interview.My query is from Process Design and Optimization topic in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer»

Discussion

6.	In Jafarey Equation, N is predicted with an error of(a) ± 2 to 3(b) ± 1 to 2(c) ± 6 to 7(d) Can’t be specifiedI have been asked this question in unit test.I need to ask this question from The Jafarey, Dougles and Mcavoy Equation in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The correct ANSWER is (a) ± 2 to 3 To explain: In Jafarey Equation N is PREDICTED with an ERROR of ± 2 to 3 stages, this is an ideal error with RESPECT to human and conservative errors that occur.

Discussion

7.	Smoker’s equation is convenient to use, in binary separations with(a) Large number of stages(b) Small number of stages(c) Independent stages(d) Dependent stagesI have been asked this question at a job interview.My query is from Analytical X-Y Diagram -Smoker’s Equation in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» RIGHT answer is (a) Large NUMBER of stages Explanation: SMOKER’s equation is convenient to USE in binary separations with large number of stages, while Fenske’s for the minimum number of trays.

Discussion

8.	The Smith-Brinkley (SB) method, is based on an analytical solution of the(a) Infinite-difference equations(b) Differential Equations(c) Integration(d) Finite-difference equationsI had been asked this question in an international level competition.This interesting question is from Analysis of Existing Columns with Brinkley Method topic in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» RIGHT choice is (d) Finite-difference equations Explanation: The Smith-Brinkley (SB) method, is BASED on an ANALYTICAL solution of the finite-difference equations that can be written for staged separation PROCESSES.

Discussion

9.	The reflux ratio corresponding to the minimum total cost is called as(a) Optimum reflux ratio(b) Minimum reflux ratio(c) Final Ratio(d) Total Reflux RatioThis question was posed to me in semester exam.Question is taken from Minimum Reflux for System Containing Distributed Monkeys in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer»

Discussion

10.	If S=8.137 and α =1.956. Then No. of stages are?(a) 13(b) 14(c) 12(d) 16The question was posed to me during an interview.This interesting question is from Minimum Reflux topic in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» RIGHT ANSWER is (C) 12 The EXPLANATION: As N=S/ln α = 8.137/ln 1.956 = 12.

Discussion

11.	When R is infinite, the slope of this rectifying becomes(a) 0(b) 1(c) 0.5(d) Can’t be specifiedThe question was posed to me in semester exam.Query is from Minimum Stages in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right CHOICE is (B) 1 Best EXPLANATION: When R is infinity, the slope of this line becomes 1, while R is ZERO the slope of this line REACHES infinity.

Discussion

12.	What does RVP Stands For?(a) Reid Vapor pressure(b) Reflux vapor pressure(c) Reid Viscous Parameter(d) Right Vary ParameterThe question was posed to me in semester exam.My enquiry is from Process Design and Optimization topic in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» CORRECT option is (a) REID VAPOR pressure Explanation: It is a physical property representing Reid Vapor pressure, while for PERFORMING REFLUX operations the Reflux vapor pressure is considered.

Discussion

13.	If the feed temperature is 211^oK and Dew point is 70^oF, then tn is(a) 68^oF(b) 178^oF(c) 140.5^oF(d) 259.5^oFI had been asked this question in final exam.The question is from Analysis of Existing Columns with Brinkley Method topic in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right answer is (c) 140.5^oF To ELABORATE: As TN= (70+211)/2 = 140.5^oF.

Discussion

14.	Smith Brinkley method is valuable for(a) Off-line optimization(b) Reflux optimization(c) On-line optimization(d) In-line optimizationI had been asked this question in my homework.Question is taken from Analysis of Existing Columns with Brinkley Method topic in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Correct OPTION is (c) On-line optimization The EXPLANATION is: SMITH Brinkley method is valuable for On-line optimization, while NR for the REFLUX Reflux optimization.

Discussion

15.	Smith Brinkley method is valuable for(a) Off-line optimization(b) Reflux optimization(c) On-line optimization(d) In-line optimizationThis question was posed to me during an interview.I want to ask this question from Analysis of Existing Columns with Brinkley Method in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer»

Discussion

16.	The hi is defined as the(a) Correlating factor(b) Correction Factor(c) Striping Factor(d) Relating FactorThe question was asked during an interview for a job.I would like to ask this question from Analysis of Existing Columns with Brinkley Method topic in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» CORRECT answer is (a) Correlating factor To explain: The correlating factor is DEFINES as by hi, while L/V is DEFINED as the STRIPPING factor of systems.

Discussion

17.	If distillate is 95%, and withdrawal is 4 and α=2.5. Estimate total number of tray?(a) 7.7(b) 10(c) 6.7(d) 5.7This question was posed to me in an online quiz.My query is from Minimum Stages topic in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» CORRECT choice is (c) 6.7 Explanation: Using Fenske’s EQUATION and SUBSUMING VALUES we have 2.66/log 2.5= 6.7.

Discussion

18.	The material balance optimization is also referred as(a) L V optimization(b) B D optimization(c) D B optimization(d) V L optimizationI had been asked this question in exam.The above asked question is from Process Design and Optimization in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Correct option is (c) D B optimization The best EXPLANATION: D B is optimization at a FIXED recovery and L V optimization is done for the matching of feed rates.

Discussion

19.	At higher recovery _____ distillate is produced.(a) Low(b) More(c) Finite(d) UnwantedThis question was addressed to me during an online interview.My doubt stems from Process Design and Optimization topic in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right ANSWER is (b) More The best EXPLANATION: At higher recovery ¬¬¬¬More DISTILLATE is produced but of LOWER purity. At a lower recovery the relation FOLLOWS an inverse character.

Discussion

20.	Ki are determined at the(a) Top section Temperatures(b) Bottom section Temperatures(c) Middle section Temperatures(d) Right section TemperaturesThe question was posed to me in semester exam.My question is based upon Analysis of Existing Columns with Brinkley Method in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The CORRECT answer is (a) Top section Temperatures Best explanation: KI are DETERMINED at the Top section Temperatures, and the pressure are determined at the left and right of column RESPECTIVELY.

Discussion

21.	If Component is distributed, then(a) 0< DR> 1(b) 0< DR< 1(c) DR= 0(d) DR < 0This question was addressed to me by my college director while I was bunking the class.This key question is from Reflux Stage Relationships topic in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The correct ANSWER is (b) 0< DR< 1 Explanation: If Component is DISTRIBUTED then 0< DR< 1, DR is recovery component, if DR = 0 then there EXISTS no distributed components in the systems.

Discussion

22.	Fenske’s Equation can be written as(a) Nmin = S/ ln α(b) Nmin = ln S/ ln α(c) Nmin – 1 = ln S/ ln α(d) Nmin + 1 = ln S/ ln αThe question was posed to me in homework.My query is from Reflux Stage Relationships in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» CORRECT choice is (b) Nmin = ln S/ ln α To EXPLAIN: The Fenske’s equation is GIVEN by this equation Nmin = ln S/ ln α, where N is the NUMBER of trays and alpha is the relative volatility.

Discussion

23.	In a tray column, Murphree efficiency(a) Exceed 100%(b) Equal to 100%(c) Can’t be specified(d) Depend upon cases givenThis question was addressed to me in semester exam.Asked question is from Minimum Stages topic in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The CORRECT option is (a) Exceed 100% EASIEST explanation: In a non-ideal case, Murphree EFFICIENCY can exceed 100%, also it depends on the cases given and the FEED TYPE.

Discussion

24.	Tray efficiency correspondingly depends upon?(a) Column Diameter(b) Column throughput(c) Column length(d) Column feedThe question was posed to me by my school teacher while I was bunking the class.My doubt stems from Process Design and Optimization in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right CHOICE is (B) Column THROUGHPUT To explain I would say: Tray efficiency depends UPON column throughput and velocity depends upon the Column Diameter.

Discussion

25.	The Ratio of optimum feed stages to total number of stages is(a) Dependent on number of stages(b) Independent of number of stages(c) Independent of total stage(d) Inversely proportional.This question was posed to me in examination.This question is from Minimum Reflux in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right ANSWER is (B) Independent of number of stages The explanation is: This is mathematically EXPLAINED as Fenske’s equation, which also involves relative VOLATILITY of the COMPONENTS.

Discussion

26.	For non-ideal cases, to calculate number of stages we use(a) Point efficiency(b) Murphree efficiency(c) Tray efficiency(d) Overall efficiencyThis question was addressed to me during an online exam.Enquiry is from Minimum Stages topic in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right answer is (b) Murphree efficiency To ELABORATE: To calculate the number of stages in a non-ideal CASE, Murphree efficiency LINE is used INSTEAD of the ideal.

Discussion

27.	According to smoker’s equation, b is given as(a) R+1(b) xD/R+1(c) xD/y(d) y/R+1The question was asked in homework.My question is based upon Analytical X-Y Diagram -Smoker’s Equation topic in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» RIGHT answer is (b) xD/R+1 To ELABORATE: According to smoker’s equation b is GIVEN as xD/R+1, where XD is the moles of LIQUID distilled with the rate of reflux R.

Discussion

28.	Solve the following equation 0.3089R2 – 0.4033R – 0.1242=0?(a) 2.45(b) 1.31(c) 8.9(d) 7.8This question was posed to me by my school principal while I was bunking the class.My query is from The Jafarey, Dougles and Mcavoy Equation in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» RIGHT option is (b) 1.31 The EXPLANATION is: USING quadratic formula f(x) =0.3089R2 – 0.4033R – 0.1242, and at f (1.31) = 0 we can CONCLUDE and THUS R=1.31.

Discussion

29.	If NR is 5.44 and NS is 3.42. Total stages are(a) 2.02(b) 1.8(c) 8.86(d) 1.59This question was addressed to me in class test.My enquiry is from Analytical X-Y Diagram -Smoker’s Equation topic in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The CORRECT OPTION is (c) 8.86 Best EXPLANATION: as NR + NS = 5.44 + 3.42 = 8.86.

Discussion

30.	In a distillation operation, the reflux ratio may vary between(a) Zero and one(b) Zero and infinity(c) Minimum and infinity(d) One and twoThis question was addressed to me in unit test.This key question is from Reflux Stage Relationships in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» CORRECT choice is (a) Zero and one To elaborate: L0/D VARIES from zero to one, as the RATIO cannot be more than one because that will cause the failure of the column.

Discussion

31.	The Smith-Brinkley (SB) method, rates a column on basis of(a) Initial sequence of the stages(b) Reverse sequence of its stages(c) Forward sequence of its stages(d) Straight SequenceI have been asked this question during an online interview.My question is from Analysis of Existing Columns with Brinkley Method topic in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» RIGHT answer is (b) Reverse sequence of its stages Easy explanation: The Smith-Brinkley (SB) method rates a COLUMN on basis of Reverse sequence of its stages, so to obtain TOP to bottom APPROACH.

Discussion

32.	The McCabe Thiele method(a) Uses molal units for material and energy balance(b) Uses weight fractions to express liquid and vapor composition(c) Can use any type of units(d) Is more accurate than ponchan savarit methodI have been asked this question during an online interview.My doubt stems from Minimum Reflux for System Containing Distributed Monkeys in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The CORRECT option is (B) Uses weight fractions to EXPRESS LIQUID and vapor composition Easiest explanation: The MCCABE Thiele method uses weight fractions to express liquid and vapor composition for calculations.

Discussion

33.	PHK and PLK are also applied in(a) Hengstebeck’s equation(b) Fenske’s equation(c) Gilliland equation(d) Homotomy equationThe question was asked in class test.My doubt stems from The Jafarey, Dougles and Mcavoy Equation in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right answer is (a) Hengstebeck’s equation To explain I would say: PHK and PLK are also applied in Hengstebeck’s METHOD, while FENSKE’s equation USES the RELATIVE volatility.

Discussion

34.	^N√αN this equation is called as(a) Sorel’s Method(b) Polson Equation(c) Fenske’s Equation(d) Gilliland EquationI got this question in class test.My question is based upon Reflux Stage Relationships in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer»

Discussion

35.	HETP is numerically equal to HTU, If and only if operating line(a) Lies below the equilibrium line(b) Lies above equilibrium line(c) At equilibrium line(d) Is far from equilibrium lineI have been asked this question in a job interview.The above asked question is from Minimum Reflux for System Containing Distributed Monkeys topic in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right option is (c) At equilibrium LINE To explain: HETP is numerically equal to HTU if and only if operating line is parallel to equilibrium line, this MEANS NTU i.e. number of transfer units are UNITY.

Discussion

36.	Light non-keys end up as a(a) Final product(b) Feed outlet(c) Bottom end product(d) Overhead productI had been asked this question during an interview.My doubt is from Minimum Reflux for System Containing Distributed Monkeys topic in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Correct OPTION is (d) Overhead product For explanation I would SAY: Light non-keys ALWAYS end up as an overhead product, while HEAVY keys at BOTTOM product of the column.

Discussion

37.	Colburn method is based on the(a) Constant Molar Overflow and relative volatility(b) Steady state flow(c) Reflux ratio(d) Maximum TraysI have been asked this question by my college professor while I was bunking the class.This intriguing question originated from Minimum Reflux in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right choice is (a) Constant MOLAR OVERFLOW and RELATIVE volatility For explanation: The Colburn method is an elaborate method based on ASSUMPTION that Constant Molar Overflow and relative volatility.

Discussion

38.	The vertical D/F line indicated the(a) Maximum impurity level(b) Minimum impurity level(c) More separation(d) Less separationI have been asked this question in examination.This intriguing question comes from Process Design and Optimization topic in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» RIGHT ANSWER is (a) MAXIMUM impurity level To explain: The vertical D/F line indicated the Maximum impurity level at that POINT on the curve, and this should has to be MINIMIZED for better operations.

Discussion

39.	The ROSE Method involves the plot of(a) 1/R vs 1/N(b) 1/S vs 1/N(c) 1/S vs 1/R(d) 1/T vs 1/PI have been asked this question by my school teacher while I was bunking the class.This interesting question is from Minimum Reflux in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The CORRECT option is (a) 1/R vs 1/N Explanation: ROSE curve is not a straight line given by 1/R vs 1/N, while 1/S vs 1/N is defined as the inverse Rose curve METHOD.

Discussion

40.	Calculate ln S? If XLK=0.95 and XHK = 0.05 and XL= 0.90 and X^H= 0.10, then(a) 6.77(b) 5.142(c) 7.898(d) Can’t be calculatedThis question was posed to me in examination.This intriguing question comes from The Jafarey, Dougles and Mcavoy Equation in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» RIGHT option is (B) 5.142 For explanation I WOULD say: as ln (0.95/0.05) (0.90/0.10) = 5.142.

Discussion

41.	Calculate b? If xD= 0.95 and R=8(a) 0.445(b) 0.118(c) 0.2375(d) 0.568The question was asked in an internship interview.I would like to ask this question from Analytical X-Y Diagram -Smoker’s Equation in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» CORRECT CHOICE is (C) 0.2375 Easiest EXPLANATION: AS xD/R+1 = 0.95/8+1= 0.2375.

Discussion

42.	Calculate ln S? If XLK=0.41 and XHK = 0.005 and XL= 0.417 and XH= 0.01, then(a) 9.45(b) 8.90(c) 8.137(d) 7.98The question was asked during an online exam.My question is taken from Reflux Stage Relationships in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» CORRECT CHOICE is (C) 8.137 Easiest EXPLANATION: As LN (0.41/0.005) (0.417/0.01) = 8.137.

Discussion

43.	Which of the following assumes constant molal vaporization and overflow?(a) McCabe Thiele method(b) Ponchan Savarit Method(c) Enthalpy concentration method(d) Plate absorption methodThis question was posed to me during an interview.I need to ask this question from Minimum Reflux for System Containing Distributed Monkeys in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right OPTION is (a) McCabe Thiele method The best I can explain: The McCabe Thiele method assumes CONSTANT molal vaporization and overflow, while the Ponchan Savarit Method is based on the enthalpy BALANCE of COMPONENTS.

Discussion

44.	Minimum reflux ratio in a distillation column results in(a) Optimum no. of trays(b) Minimum reboiler size(c) Maximum condenser size(d) Minimum number of traysI had been asked this question by my school teacher while I was bunking the class.My query is from Minimum Stages topic in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Correct OPTION is (c) Maximum condenser size The best explanation: MINIMUM reflux ratio in a DISTILLATION COLUMN results in maximum condenser size as INVERSELY proportional.

Discussion

45.	The term PLK stands for(a) Primary left key(b) Pseudo Left key(c) Pseudo light key(d) Pressure light keyThe question was posed to me during an interview.Enquiry is from The Jafarey, Dougles and Mcavoy Equation topic in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The correct ANSWER is (B) Pseudo LEFT key The best explanation: The term PLK stands for Pseudo Left key, which indicated the components which are heavy key and are separated at left side.

Discussion

46.	In batch distillation, with constant reflux overhead product composition(a) Increases with time(b) Decreases with time(c) Does not vary with time(d) Does vary with timeThis question was posed to me by my school principal while I was bunking the class.This question is from Minimum Reflux for System Containing Distributed Monkeys in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Correct answer is (b) Decreases with time Easy EXPLANATION: As BATCH operation feed reduces with given time THUS reflux decreases, as batch DISTILLATION CONTAINS a limited amount of feed.

Discussion

47.	Colburn Method can be used to calculate the _____ in a binary system.(a) Minimum Reflux(b) Maximum Reflux(c) Minimum Trays(d) Maximum TraysI had been asked this question in class test.This intriguing question comes from Minimum Reflux in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Right OPTION is (a) Minimum REFLUX The best I can EXPLAIN: Minimum reflux can be calculated by the Colburn METHOD, FENSKE’s can be used for Minimum Trays.

Discussion

48.	When distillate contains highest possibility of light key, D/F approaches(a) Infinity(b) Zero(c) Unity(d) DoubleI got this question in an interview for job.This is a very interesting question from Process Design and Optimization in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» Correct CHOICE is (C) UNITY Explanation: When distillate contains highest possibility of light key D/F approaches Unity and LOWEST when D/F approaches Zero.

Discussion

49.	When a minor fraction of liquid flows to the tray below through the tray perforations it is called(a) Weeping(b) Dumping(c) Entrainment(d) FeedingThis question was addressed to me during an interview for a job.The question is from Process Design and Optimization in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The correct option is (a) Weeping To explain: During weeping, a MINOR fraction of liquid FLOWS to the tray below through the tray PERFORATIONS.

Discussion

50.	Smoker’s equation is based on assumption?(a) Constant molar overflow and volatility(b) Constant Molar overflow and viscosity(c) Constant feed and stages(d) Constant PressureThe question was posed to me in an interview for internship.This intriguing question originated from Analytical X-Y Diagram -Smoker’s Equation topic in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design
Answer» The correct option is (a) Constant molar overflow and VOLATILITY Easiest EXPLANATION: SMOKER’s equation is BASED on ASSUMPTION of Constant molar overflow and volatility, while McCabe and Ponchan are based on Constant molar overflow only.

Discussion

Explore topic-wise InterviewSolutions in .

According to smoker’s equation, C is given as(a) 1 + (α -1) k(b) 1 -(α -1)k(c) 1 -(α +1)k(d) α -1The question was asked in quiz.The query is from Analytical X-Y Diagram -Smoker’s Equation topic in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design

If Component is non-distributed, then(a) DR >1(b) DR

If S=8.137 and α =1.956. Then No. of stages are?(a) 13(b) 14(c) 12(d) 16The question was posed to me during an interview.This interesting question is from Minimum Reflux topic in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design

When R is infinite, the slope of this rectifying becomes(a) 0(b) 1(c) 0.5(d) Can’t be specifiedThe question was posed to me in semester exam.Query is from Minimum Stages in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design

If distillate is 95%, and withdrawal is 4 and α=2.5. Estimate total number of tray?(a) 7.7(b) 10(c) 6.7(d) 5.7This question was posed to me in an online quiz.My query is from Minimum Stages topic in division Column Process Design, Optimization and Shortcut Calculations of Distillation Design

At higher recovery _____ distillate is produced.(a) Low(b) More(c) Finite(d) UnwantedThis question was addressed to me during an online interview.My doubt stems from Process Design and Optimization topic in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design

According to smoker’s equation, b is given as(a) R+1(b) xD/R+1(c) xD/y(d) y/R+1The question was asked in homework.My question is based upon Analytical X-Y Diagram -Smoker’s Equation topic in chapter Column Process Design, Optimization and Shortcut Calculations of Distillation Design

If NR is 5.44 and NS is 3.42. Total stages are(a) 2.02(b) 1.8(c) 8.86(d) 1.59This question was addressed to me in class test.My enquiry is from Analytical X-Y Diagram -Smoker’s Equation topic in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design

Calculate b? If xD= 0.95 and R=8(a) 0.445(b) 0.118(c) 0.2375(d) 0.568The question was asked in an internship interview.I would like to ask this question from Analytical X-Y Diagram -Smoker’s Equation in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design