122 + Interview Questions in Rigorous Distillation Calculations in Distillation Design Page 3 InterviewSolution

101.	In the below equation, e^Lj represents?(a) Gas flux(b) Equilibrium(c) Energy(d) Liquid fluxI got this question in final exam.Enquiry is from Non Equilibrium Rate Based Methods topic in division Rigorous Distillation Calculations of Distillation Design
Answer» Right choice is (d) LIQUID flux To EXPLAIN I would say: Liquid flux at INTERFACIAL area daj, ENERGY involved PER unit area involved is defined as the liquid flux.

Discussion

102.	In global Newton method, The K value is(a) Coupled(b) Decoupled(c) Extreme(d) Bi-lateralThe question was posed to me during an interview.My question is from Global Newton Method topic in division Rigorous Distillation Calculations of Distillation Design
Answer» The correct choice is (B) Decoupled The explanation is: In global Newton method, The K VALUE is decoupled, as two values can lead to DIFFERENT CALCULATIONS and thus only an average value is chosen.

Discussion

103.	For a total condenser, the reflux ratio just include(a) L1/KI1D(b) – (1+L1/D)(c) – (1+L1/KI1D)(d) – (Aij)The question was posed to me in an online quiz.I'm obligated to ask this question of Tridiagonal Matrix Method for Material Balances topic in division Rigorous Distillation Calculations of Distillation Design
Answer» The correct choice is (B) – (1+L1/D) For explanation: For a total CONDENSER the reflux RATIO just include mij= – (1+L1/D), Where D is the distillate of the column and L is the liquid FLOW rate of column.

Discussion

104.	When a solution is said to be formed?(a) All MESH equation are zero(b) All MESH equation are infinite(c) All MESH equation are satisfied(d) All MESH equation are unityI had been asked this question in an international level competition.My question comes from Rigorous Distillation-Basic Concepts in section Rigorous Distillation Calculations of Distillation Design
Answer» RIGHT CHOICE is (c) All MESH equation are satisfied Easy explanation: When all MESH equation are satisfied a solution is said to be formed, when MESH are ZERO this represent the error in CALCULATIONS.

Discussion

105.	Rigorous methods are used as primary(a) Stage calculation tools(b) Cost calculation tools(c) Control optimization tools(d) Design and optimization toolsThe question was asked during a job interview.My query is from Rigorous Distillation-Basic Concepts topic in portion Rigorous Distillation Calculations of Distillation Design
Answer» RIGHT option is (d) DESIGN and optimization TOOLS Easiest explanation: RIGOROUS methods are USED as primary Design and optimization tools and Procuring methods are used for calculations of cost and stages.

Discussion

106.	MERQ Stands for?(a) Material, equilibrium, regression and heat(b) Material, Energy, rate and equilibrium(c) Material, equilibrium, summation and Quality(d) Material, equilibrium, summation and heatThe question was asked during an interview.Query is from Non Equilibrium Rate Based Methods in portion Rigorous Distillation Calculations of Distillation Design
Answer» Correct OPTION is (b) Material, ENERGY, RATE and EQUILIBRIUM Explanation: MERQ Stands for Material, Energy, rate and equilibrium, Whereas MESH stands for Material, equilibrium, summation and heat.

Discussion

107.	The end of an equilibrium curve is called as(a) Critical point(b) Triple point(c) End point(d) Single pointI have been asked this question in an internship interview.This key question is from Problems When Setting Simulation Input in portion Rigorous Distillation Calculations of Distillation Design
Answer» RIGHT choice is (a) Critical point The explanation is: A critical point is the end point of a phase EQUILIBRIUM curve, while the point where all three phases of WATER coexist is CALLED as triple point and final stages of any curve are called as end point.

Discussion

108.	F(x) stands for(a) Simpler solution(b) Complex Solution(c) Difficult Solution(d) Simple SolutionI have been asked this question by my school teacher while I was bunking the class.Enquiry is from Relaxation Method topic in section Rigorous Distillation Calculations of Distillation Design
Answer» Correct OPTION is (c) Difficult Solution To explain I WOULD say: F(X) stands for Difficult Solution, as we can follow the Homotomy EQUATION curve and path of curve.

Discussion

109.	For Russell method, ln Kbj is defined as(a) Aj – (Bj/Tj)(b) – (Bj/Tj)(c) Aj (Bj/Tj)(d) Aj + (Bj/Tj)The question was asked in class test.The above asked question is from Inside Out Method in portion Rigorous Distillation Calculations of Distillation Design
Answer» RIGHT choice is (a) Aj – (Bj/Tj) For explanation I WOULD say: For Russell method ln KBJ = Aj–(Bj/Tj), the Russell equations resembles the same as that of the Antoine equation for detecting vapor PRESSURE.

Discussion

110.	QR is denoted as the(a) Heat of reference(b) Heat of resemblance(c) Heat of rigorous(d) Heat of ReboilerI had been asked this question during a job interview.This intriguing question originated from Global Newton Method in portion Rigorous Distillation Calculations of Distillation Design
Answer» CORRECT CHOICE is (d) Heat of Reboiler Best explanation: QR is denoted as the Heat of Reboiler, the bottom product can cause heat LOSSES thus loosing heat can cause FAILURE thus reboiler heat QR is necessary.

Discussion

111.	9) Newton’s method cannot continue, if for some Pn-1(a) f’(Pn+1)(b) f’(P)(c) f’(Pn-1)(d) PThe question was asked in examination.This is a very interesting question from 2N Newton Method topic in section Rigorous Distillation Calculations of Distillation Design
Answer» Correct answer is (c) F’(Pn-1) Easy EXPLANATION: Newton’s method cannot continue if for some f’ (Pn-1), as the DERIVATIVE at some point BECOMES zero then this is called as FAILURE in the newton’s method.

Discussion

112.	The θj factor is a(a) Subtracted(b) Additive(c) Multiplier(d) DividerThe question was asked in my homework.My doubt is from 2N Newton Method in division Rigorous Distillation Calculations of Distillation Design
Answer» Right ANSWER is (c) Multiplier For explanation I would SAY: As \|L/V\| = θj*\|Lj/Vj\|CR and θj factor is a Multiplier, this is based on a correlation that ACTS as a correction factor of the calculation.

Discussion

113.	XIJ and Yij are the component balances of(a) Equilibrium relation(b) Constant relation(c) Final relation(d) Direct relationI had been asked this question in exam.My enquiry is from 2N Newton Method in division Rigorous Distillation Calculations of Distillation Design
Answer» The correct answer is (a) Equilibrium relation The explanation is: XIJ and Yij are the COMPONENT BALANCES of Equilibrium relation, Whereas X=Y represents the FINAL relation of the SYSTEM.

Discussion

114.	The independent variables of independent functions are used as, Fi =(a) [E1 E2 E3 …. EN-1 EN, K1 K2 K3 …. KN-1 KN].(b) [T1 T2 T3 …. TN-1 TN, K1 K2 K3 …. KN-1 KN].(c) [S1 S2 S3 …. SN-1 SN, E1 E2 E3 …. EN-1 EN].(d) [K1 K2 K3 …. KN-1 KN, T1 T2 T3 …. TN-1 TN].This question was addressed to me by my school teacher while I was bunking the class.Asked question is from 2N Newton Method in division Rigorous Distillation Calculations of Distillation Design
Answer» RIGHT choice is (c) [S1 S2 S3 …. SN-1 SN, E1 E2 E3 …. EN-1 EN]. The explanation: As Fi= [S1 S2 S3 …. SN-1 SN, E1 E2 E3 …. EN-1 EN] ^T, where S is the same FACTOR as USED in Fenske’s equation and E are the respective energy of the systems.

Discussion

115.	Naphtali Sandholm method uses(a) MESH(b) LVF(c) RVF(d) TEMAI had been asked this question in an interview for job.My question is taken from Global Newton Method topic in chapter Rigorous Distillation Calculations of Distillation Design
Answer» CORRECT ANSWER is (a) MESH Explanation: Naphtali Sandholm METHOD uses temperature and vapor from MESH, while TEMA is the standards used for the design of HEAT exchangers and other columns.

Discussion

116.	The transposed vapor rate vector, Vi is raised to power of(a) Jk(b) Ik(c) T(d) PThis question was addressed to me by my school principal while I was bunking the class.My question comes from Stratergy of Solution using Rigorous Methods topic in chapter Rigorous Distillation Calculations of Distillation Design
Answer» RIGHT choice is (C) T The explanation is: As VI = (DI, vi1, vi2, viN) ^T So T is POWER, here T represents the temperature on which the vapor rate is measured.

Discussion

117.	The number of independent functions are equal to(a) Number of Trays(b) Number of Stages(c) Number of species(d) Number of FeedsThe question was posed to me during an online exam.This intriguing question originated from Sumrates Method topic in section Rigorous Distillation Calculations of Distillation Design
Answer» CORRECT option is (B) Number of Stages To ELABORATE: as Fi = [E1 E2 E3…..EN] INDEPENDENT functions are equal to number of Stages, it has no relation with the number of trays and FEED they are totally independent.

Discussion

118.	Rigorous method are based on?(a) Heat duties(b) Product compositions(c) Feed tares(d) StagesThis question was posed to me in unit test.This intriguing question originated from Stratergy of Solution using Rigorous Methods in portion Rigorous Distillation Calculations of Distillation Design
Answer» The CORRECT option is (a) Heat duties To explain I WOULD say: Rigorous method are based on Heat duties and other methods are based on the FEED and PRODUCT compositions.

Discussion

119.	In the following equation, e^vj represents?(a) Gas flux(b) Liquid flux(c) Energy(d) EquilibriumI got this question in an online quiz.Question is taken from Non Equilibrium Rate Based Methods topic in chapter Rigorous Distillation Calculations of Distillation Design
Answer» Right ANSWER is (a) GAS flux The EXPLANATION is: Gas flux at interfacial area daj and the equilibrium energy consumption BASED on the area of ACTION and effective energy.

Discussion

120.	The temperature where the first vapor is formed, when heating a liquid consisting of two or more components(a) Dew point(b) Bubble point(c) Final point(d) Aniline pointI have been asked this question in an online interview.Origin of the question is Bubble Point Method in section Rigorous Distillation Calculations of Distillation Design
Answer» The correct answer is (a) Dew point For explanation I would say: The temperature where the FIRST VAPOR is formed when heating a liquid consisting of TWO or more components BUBBLE point, while when the first drop of aniline separates out is called the aniline point. ^Nc∑Yi ∑Kixi.

Discussion

121.	In matrix form, the total material balance equations are expressed as(a) F V=-R(b) RV=-F(c) L/V=F(d) V/R = FThe question was asked in an international level competition.My question is taken from Tridiagonal Matrix Method for Material Balances in division Rigorous Distillation Calculations of Distillation Design
Answer» The CORRECT option is (b) RV=-F Easiest explanation: In matrix form the total material balance EQUATIONS are expressed as RV= -F, this matrix can be solved either by DETERMINANT method or L U method.

Discussion

122.	Tj is assigned as the(a) Stage temperature(b) Boiler temperature(c) Condenser temperature(d) Components temperatureThis question was posed to me in examination.This intriguing question comes from Rigorous Computational Methods in portion Rigorous Distillation Calculations of Distillation Design
Answer» CORRECT answer is (d) Components temperature The BEST I can EXPLAIN: Tj is assigned as the Stage temperature, While TC and TB are assigned as condenser and boiler temperature.

Discussion

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In the below equation, e^Lj represents?(a) Gas flux(b) Equilibrium(c) Energy(d) Liquid fluxI got this question in final exam.Enquiry is from Non Equilibrium Rate Based Methods topic in division Rigorous Distillation Calculations of Distillation Design

In global Newton method, The K value is(a) Coupled(b) Decoupled(c) Extreme(d) Bi-lateralThe question was posed to me during an interview.My question is from Global Newton Method topic in division Rigorous Distillation Calculations of Distillation Design

The end of an equilibrium curve is called as(a) Critical point(b) Triple point(c) End point(d) Single pointI have been asked this question in an internship interview.This key question is from Problems When Setting Simulation Input in portion Rigorous Distillation Calculations of Distillation Design

F(x) stands for(a) Simpler solution(b) Complex Solution(c) Difficult Solution(d) Simple SolutionI have been asked this question by my school teacher while I was bunking the class.Enquiry is from Relaxation Method topic in section Rigorous Distillation Calculations of Distillation Design

For Russell method, ln Kbj is defined as(a) Aj – (Bj/Tj)(b) – (Bj/Tj)(c) Aj (Bj/Tj)(d) Aj + (Bj/Tj)The question was asked in class test.The above asked question is from Inside Out Method in portion Rigorous Distillation Calculations of Distillation Design

QR is denoted as the(a) Heat of reference(b) Heat of resemblance(c) Heat of rigorous(d) Heat of ReboilerI had been asked this question during a job interview.This intriguing question originated from Global Newton Method in portion Rigorous Distillation Calculations of Distillation Design

9) Newton’s method cannot continue, if for some Pn-1(a) f’(Pn+1)(b) f’(P)(c) f’(Pn-1)(d) PThe question was asked in examination.This is a very interesting question from 2N Newton Method topic in section Rigorous Distillation Calculations of Distillation Design

The θj factor is a(a) Subtracted(b) Additive(c) Multiplier(d) DividerThe question was asked in my homework.My doubt is from 2N Newton Method in division Rigorous Distillation Calculations of Distillation Design

XIJ and Yij are the component balances of(a) Equilibrium relation(b) Constant relation(c) Final relation(d) Direct relationI had been asked this question in exam.My enquiry is from 2N Newton Method in division Rigorous Distillation Calculations of Distillation Design

Naphtali Sandholm method uses(a) MESH(b) LVF(c) RVF(d) TEMAI had been asked this question in an interview for job.My question is taken from Global Newton Method topic in chapter Rigorous Distillation Calculations of Distillation Design

Rigorous method are based on?(a) Heat duties(b) Product compositions(c) Feed tares(d) StagesThis question was posed to me in unit test.This intriguing question originated from Stratergy of Solution using Rigorous Methods in portion Rigorous Distillation Calculations of Distillation Design

In the following equation, e^vj represents?(a) Gas flux(b) Liquid flux(c) Energy(d) EquilibriumI got this question in an online quiz.Question is taken from Non Equilibrium Rate Based Methods topic in chapter Rigorous Distillation Calculations of Distillation Design

Tj is assigned as the(a) Stage temperature(b) Boiler temperature(c) Condenser temperature(d) Components temperatureThis question was posed to me in examination.This intriguing question comes from Rigorous Computational Methods in portion Rigorous Distillation Calculations of Distillation Design