Grand Viva - 2015

[sanchitsingal84]

Hi Everyone,

I would request all final year students who gave their grand viva last week to post the questions they faced in the following thread.

Regards

Sanchit Singal

IIT Kharagpur

[Akash Gupta]

My panel was SNG, JKB and VHP.

SNG:

1) What are your plans after KGP?

2) Write Navier-Stokes equation.

3)What is venturimeter? Draw pressure profile along the length.

4) What is Rotameter? How it works.

5) Draw the schematic of a float.

6) Is Buoyancy a body force or drag force.

7) What is Newton Raphson method?

8) Are all methods iteration based? 

9) Have you heard about Gauss elimination?

10) Can Newton Raphson be used to solve a 10x10 matrix?

JKB:

1) Draw schematic for the 3 types of reactors.

2) Write mole balance for all 3.

3) What is RTD? What is average residence time.

4) Are CSTR in series ideal or non-ideal?

5) u/DL?

6) Importance of dispersion number? What is Peclet Number?

7) How does dispersion number vary when the number of CSTRs in series are increased?

8) What is fludized bed?

9) What is Carnot Cycle? Draw it.

10) What are isothermal and adiabatic process.

11) Which process has more work done.

VHP:

1) What are baffles? What are its functions?

2) In a condenser, if the baffles are removed, what changes should be made to maintain the same efficiency?

3) What is the function of Reflux Drum.

4) What is osmotic pressure? 

5) What is SMP?

6) What is the difference between dialysis and RO?

7) What subjects have you taken this semester?

8) Future plans.

Warm regards-

Akash Gupta

Final Year Undergraduate Student
Department of Chemical Engineering
Indian Institute of Technology, Kharagpur
+91 7699499369

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[Abhishek Agarwal]

My panel was same with Akash Gupta, though I was asked less questions but all are included.

[Aditya Jalan]

I also had the same panel. I would just mention the questions not included by gupta.

SNG:

1.Give  some examples of body forces

2.What is multivariate newton raphson

JKB:

1. Two CSTR of different volume are connected in series. Find the relation between the initial flow rate and concentration after 2nd reactor, assume first order reaction.

2. What are the disadvantages of using a bigger size catalyst pellet.

3. In a process pressure and temperature changes simultaneously then how will you find the entropy

VHP:

1. How can you improve the efficiency of HE without putting in new baffles ? 

[Palak Rungta]

My panel was same i.e VHP, JKB, SNG. I am just listing the questions which have not been mentioned already.

VHP:

1. Stefan Boltzman Law.
2. What property of objects effect emission?
3. How pressure is maintained using a reflux drum?

JKB:

1. Different types of solid liquid reactors.
2. Back mix reactors.
3. Vant-hoff equation
4. how pellet size affects mass transfer
5. Gibbs Duhem equation
6. how will you find fugacity coefficeient.

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Palak Rungta

Fourth year Under-graduate

Department of Chemical Engineering

Indian Institute of Technology, Kharagpur

Ph: +91-8001619399

Email: palak...@gmail.com

[vikas.iit.29]

My panel was Kundu, Sonali and D.Sarkar.

KUNDU:

Bernoulli's eq with its assumption

Pressure drop term

Pump for slurry

1st 2nd 3rd law of thermo

Gibbs Duhem eq

Sonali: 

Sider tate eq

Heat exchanger diagram

baffles cut, tie rods, leakage in pipes, LMTD etc

CRE: If K is given how will you calculate X (reaction was given).

Sarkar:

fourier law

Is k scalar vector tensor?

method to solve ODE and PDE

Laplace transformation 

Eigen vector

[Ankur Verma]

My panel was JKB , VHP and SNG

VHP

1. Plans after kgp 

2. In baker hughes what is going to be ur role ?? (my answer : drilling fluids ...thought of diverting discussion on fluid mechanics but use literally kuch nhi aata :P )

3. Why crude prices going down ?

4. why baker why not schlums( I was like...... abe chutiya hai kya kuch bhi ,,, jo milegi wahi toh jaunga !!! )

5. planning for MBA? (bhak sale Nhi karni MBA :P )

6. FAV subject  (Fluid mechanics ..but he asked questions from Mass transfer :p )

7. Osmotic pressure 

8. kirchoff's law for conduction 

9. ficks 1st law 

10. how and why to create turbulence in HE ( Baffles , increase fluid velocity )

11. Dialysis 

12. liquid liquid extraction related question.

then again on Baker Hughes ...blah blah blah 

at the end he said ALL the bast ankur !! ( I aksed sir is this for GV or Job ??..he said "kuch bhi samjh lo ")

SNG 

1. same bakar on Baker Hughes for 10 minutes 

2. Rotameter working 

3. Newton Rapson method

4. Crude properties 

5. again why crude prices... ??

6. venturi meter 

7. orific meter 

9. different kinds of fluids 

JKB 

1. what is epsilon 

2. gave one question on calculation of epsilon [A + 2B ---> C + D    A= 30% B= 45% ]

3. basic questions on thermodynamics 

4. One tricky question on thermo : draw one diagram ans asked me to find work done as the function of mole changes 

 

--

[Ankur Verma]

*best *asked :P :D 

[uday shankar]

My panel was same as that of Vikas kumar. So I am just adding questions which are different of from already listed questions:

Kundu:

-What is entropy? how to reduce entropy of a system?

-What is reylonds analogy?

-N.S equation , assumptions, utility?

-Poiseuille's equation, Darcy's law,filtration equation

-What is couette flow? what if the lower surface is moving   and the upper surface remains static?

-Work Index, Bonds Law , Kicks Law, Rittinger's law.

-How to calculate efficiency?

Sonali:

-Heat excahnger diagram

-How tubes are fitted inside the shell? How are they attached to the tube sheet?

-Auto catalytic reaction, which reactor to be used?

-Suppose you have two identical CSTR reactors of volume 2.5 liters each and two PFR of vol 1.5 liters and 1 liter. For any given reaction how will you connect them in series?

Sarkar:

-Difference between Conduction and Convection.

-What is the steady state temperature profile in a rectangular slab if the fluid on one side is held at Tb1 and the fluid on the other side is held at Tb2? For small Biot number and for large biot number.

-How to solve a series of n linear equations?

ᐧ

--

Regards,

Uday Shankar

UG Fourth Year, Chemical Engineering

IIT Kharagpur

Ph: 8768129088

[Harshna Paroha]

Panel-Swati Neogi, Saikat Chakraborty and A.K Jana

 

Swati Neogi- (Only reading her notes would suffice the requirement; She was the best in the panel )

1.) What is the basic law of mass transfer ? Write its expression.

2.)How will you define molar flux J?  How it varies with different frames of reference?

3.) How can we predict Gas phase diffusion coefficient? (She expected me to remember whole Chapman-Enskog eqn but I just told her the variation of T ^1.5 and P)

4.) What is the use of Stefan Tube?

5.) What are the various theories of mass transfer? What were the model parameters in each theory?

 

A.K Jana- (His part of my viva was the shortest)

 

1.) What are your favourite subjects? A. I said Heat transfer, he smiled and said this is not my area of expertise. He mentioned his subjects of interest but then continued my viva with heat transfer questions only)

2.) Someone before me made a rough sketch of  1,2 shell n tube Heat exchanger. He asked me to redraw it and correct it . Followed by couple of questions on baffles (advantages and disadvantages), tie rods, etc.

3.) What is overall heat transfer coefficient? Significance? How many resistances are included to calculate 'U'?

 

Saikat Chakraborty-

 

(Refer to KMJ's viva questions )

ᐧ

Harshna Paroha

Department of Chemical Engineering

IIT Kharagpur

+91-9002287068

[Saket Gubba]

My panel was Sonali,Sarkar,Kundu

I am doing Btech in Chemical and Mtech in Finance.

Nothing much was there in my viva,All of the three started asking,what does your roll number(11CH3FP12) signify.Why did u take finance. About 5 min was wasted by every one in this useless thing.

Sonali:

1)Write does Dittus Bolter equation and explain all the terms in it.

2)Draw the 1-2 Heat exchanger and explain how does it work.

3)Write the Arhenius equation and for two diff Ea, where Ea1>Ea2, Draw the graph of k vs T.

4)For the same volume and flow rate in a CSTR and PFR,which will have a higher conversion?

5)What is an elementary reaction?

Kundu:

1)Did you attend mech op cls,I dont remember your face.Why did you sit behind etc etc.Did Arnab also teach you Mech op.etc etc

2)Draw a rotameter and explain its working.Is it a variable area or a variable pressure instrument.

3)Draw an oriface meter and a venturimeter,In which are the losses more.

4)What is a vena contracta?

5)What is eulers Equation

6)He shifted to economics later on,Asking what is micro and macro econimics,Then asked about demand and supply curve,some questions related to regression analysis.and later on what are your plans,Where do you want to settle in future? some more useless questions

Sarkar:

1)Which all subjects did you cover did you take this semester.Whos teaching you.

2)He wrote the heat equation and asked to derive it.

3)write fouriers law.Now write it for 3D case.and how many initial and boundary conditions do you require.

4)How do you solve a pde.Tell the numerical methods which you are familiar with.

5)If i give you about 60 linear equations,How will you solve.

6)What is Eulers forward method and Eulers Backward Method.Which is good and why??Among the two which is an implicit and which is an explicit method.

7)That was the end,Later he went into politics from my home state,asking from where are you.Whos your chief minister,whos your finance minister.Whos the vice president of india,finance minister of india.Hows your chief minister ruling etc etc.Who do you think will win the delhi elections and about 10 mins of useless talk about politics.

ᐧ

On Mon, Feb 9, 2015 at 1:06 PM, uday shankar <mailuda...@gmail.com> wrote:

[rishav ranjan]

My panel was RM, PAD, S ray:

RM :

Asked a few questions about psychometric chart (I said i do not know, so he didn't ask further)

What is boundary layer ?
draw thermal and momentum boundary layer ? which will be bigger and why ?
what is advection ? difference between advection and convection ?

what is substantial derivative ? Derive it.

what is Cp ? Cv ? relation between them ? valid for what scenario ?
Wander Vaal's equation ? significance of a and b in the equation ?

PAD

Drew a cylindrical pore and asked to write the constitutive equation for reaction and mass balance.
asked to write a constitutive equation for any system ( i wrote fourier law). Asked few questions on it. How temp will vary for a bar of metal kept at two different temp. Asked me to write the pde for the system and to show how temp. varies with time as well.

S ray

how to increase purity of top product in a distillation column?

what is transport phenomena ?

what is tromboyl ? what is weiglow table ? what is blake crusher ? what is hardgrove crushability index ? what is filter aid ?

what is zeroth law of thermodynamics ?

asked significance of terms in navier stokes ?
asked about my job and then asked what is principal component of harpic ?
chemical name of bleaching powder ?

what is 1st order system ? write a transfer function for 1st order ?
what is laplace transform ? why do we do it ?

Rishav Ranjan

Final Year , Chemical Engineering

IIT Kharagpur

Ph No. : 9748170638

[Pankaj Kumar]

My panel was Sray, RM and PAD

PAD:

1) calculate the entropy of double pipe heat exchanger.

2) entropy will increase or decrease?

3) expression of entropy? why 'dQ' not delta Q in expression

4) draw entropy graph for same heat exchanger

RM

1) LMTD and its derivation

2) boiling curve n explain it

3) dirt factor and write the expression

4) sate curve

5) difference between leaching and extraction

6) expression of vanderwall equation

7) draw 2-4 pass shell and tube heat exchanger

Sray

1) how will u convert toluene to nitro toluene . what catalyst could be used. how many isomer are possible of nitrotolene

2) asked somthing about condenser

3) what is plate type heat exchanger?

4) zeroth law of thermodynamics

5) angle of nip in roll crusher

6) characteristic curve of centrifugal pump and one problems to find pressure drop if head and flow is given

7) triple point

only this much questions, I remember...

On Mon, Feb 9, 2015 at 1:55 PM, Saket Gubba <gubba...@gmail.com> wrote:

[Madasu Navya]

My panel was Swati Neogi, Saiket and Jana

Swati Neogi: ( Everything she taught in MT 1 )

1. Driving force for Mass Transfer

2. Fick's law 

3. Analogy between heat, mass and momentum 

4. Types of diffusion ( in terms of diffusing, non diffusing) Ans: Na=0, Nb#0 ; counter diffusing ( equi and non equimolar )

5. There is carbon charcoal and air is passed on it, what kind of diffusion is it ? Ans: C + O2 ---> CO2  equimolar counter diffusion

         2C + O2 ---> 2CO  non-equimolar counter diffusion) 

6. Methods used for finding diffusivity, both gas phase and liquid phase

7. W = K*  Driving force. Is this valid for all mass transfer processes? Ans : yes

8. Theories used to find convective mass transfer? and some stuff related to that

9. What flow meters you are aware of? I told rotameter, orifice and venturi

10. Working principle of rotameter

Jana: Fav subject ( I told heat and mass) - He told that these subjects are not of his interest

Asked me whether I want subject or intelligent questions

1. Why don't we have 1,3 Heat Exchangers?

2. Asked me about some terms which I'm not aware of. Then asked me about pool boiling and related graph ( q vs excess temp.)

3. What is pitch? Types of pitch. ( square and triangular) Advantages and disadvantages of both of them

 

Saiket:

1. Formula for Michaelis Menten Kinetics

2. Given a CSTR and 2 equations

    A + B ---> R   (K1)

    R + B ---> S   (K2) 

    K1/ K2 ---> infinite , then how can you attain max conc. of S? Explain

3. Difference between ideal and non ideal reactors. Example for non ideal reactor

4. Different types of reactors available 

5. How to find Eigen values ? What are their significance (Ans: Determining stability, explained him in terms of real part of complex number and told him the conditions of stability and unstability)

6. Then asked me about neutral stability and related graph

7. What is competitive Inhibition?

8. Write relation between thickness and distance travelled  for flow , heat and mass 

9. Explicit euler method formula. 

--

---
Regards,
Madasu Navya,
4th year Undergraduate Student,
Department of Chemical Engineering,
IIT Kharagpur.

[Madasu Navya]

My panel was Swati Neogi, Saiket and Jana

Swati Neogi: ( Everything she taught in MT 1 )

1. Driving force for Mass Transfer

2. Fick's law 

3. Analogy between heat, mass and momentum 

4. Types of diffusion ( in terms of diffusing, non diffusing) Ans: Na=0, Nb#0 ; counter diffusing ( equi and non equimolar )

5. There is carbon charcoal and air is passed on it, what kind of diffusion is it ? Ans: C + O2 ---> CO2  equimolar counter diffusion

         2C + O2 ---> 2CO  non-equimolar counter diffusion) 

6. Methods used for finding diffusivity, both gas phase and liquid phase

7. W = K*  Driving force. Is this valid for all mass transfer processes? Ans : yes

8. Theories used to find convective mass transfer? and some stuff related to that

9. What flow meters you are aware of? I told rotameter, orifice and venturi

10. Working principle of rotameter

Jana: Fav subject ( I told heat and mass) - He told that these subjects are not of his expertise

Asked me whether I want subject or intelligent questions

1. Why don't we have 1,3 Heat Exchangers?

2. Asked me about some terms which I'm not aware of. Then asked me about pool boiling and related graph ( q vs excess temp.)

3. What is pitch? Types of pitch. ( square and triangular) Advantages and disadvantages of both of them

 

Saiket:

1. Formula for Michaelis Menten Kinetics

2. Given a CSTR and 2 equations

    A + B ---> R   (K1)

    R + B ---> S   (K2) 

    K1/ K2 ---> infinite , then how can you attain max conc. of S? Explain

3. Difference between ideal and non ideal reactors. Example for non ideal reactor

4. Different types of reactors available 

5. How to find Eigen values ? What are their significance (Ans: Determining stability, explained him in terms of real part of complex number and told him the conditions of stability and unstability)

6. Then asked me about neutral stability and related graph

7. What is competitive Inhibition?

8. Write relation between thickness and distance travelled  for flow , heat and mass 

9. Explicit euler method formula. 

[Dimple Bansal]

My panel was Swati Neogi, Saiket and Jana

Swati Neogi:

1. Mass Transfer driving force

2. Different ways of representing mass fluxes in different frames of references (Ans: I, J and N)

3. Experimental methods used to find Diffusion coefficient

4. Molar flux formula for multi-component mixture  

5. Different modes of heat transfer and their formulas

6. Analogy between heat and mass transfer

7. Bernoulli's equation. Modification required for bends and viscous flows

8. Different flow meters

9. Working principle of Rotameter

10. Relation between gas diffusion coefficient, Temperature and Pressure. (D as a function of T^1.5/P)

11.  What are the conditions which make Dab= Dba relation valid? (Ans: Ideal solutions)

Saikat:

Same as Kumar Mayank Jha and Navya

1. Subtrate Inhibition and its rate equation 

2. Monod Growth Model

3. Significance of process stability and how to judge the stability based on eigen values.

4. Is recycle reactor Ideal or Non ideal? Why?

5. How can we make ideal CSTR and PFR non ideal?

6. Analogy between heat, mass and momentum, relation of different boundary layer thicknesses with dimensionless numbers

AKJana:

 Drew me a distillation column with wall  installed vertically inside the column and asked me:

1. To design trays for the column 

2. Write mass, component and energy balance equations for each tray

2. Write the equations of heat transfer through the wall and how will it effect the composition and temperature of products

3. Relative voltatility is a function of which parameters? ( asked me to derive the relation using Dalton and Raoult's Law) (Ans: It is a function of molar composition, total pressure and vapour pressure of the components)

--

[aadikan93]

My panel was Prof. Sonali Sengupta, Prof. Debasis Sarkar, and Prof. Gautam Kundu.

These are questions which are not covered elsewhere

Another interesting dimension in my panel ( and SNG,JKB and VHP one too) was that at the beginning, professors split up subjects among themselves. Pro: They are testing u in stuff they dont have expertise in, Con: You cant skip any subject even after knowing the panel

We came to know about the panel 4 hrs before the viva. 

GK

1) What is the second law of thermodynamics? 

2) What are Carnot, Otto and Diesel Cycle?

3) Difference between Sphericity and Angularity ( synonym of shape factor, it seems)

4) Derive the work done in a cycle in Carnot Engine

5) Darcy's law, and different types of mean diameters.

6) General plans for the future, about university offers and why Stanford , Princeton , GRE scores :P, etc.

SSG

1) Draw 1-2 heat exchanger, baffles , why shell side from bottom to top( no channeling) 

2) This was interesting:

There is a leak in ur HE, in some of the tubes, how will you locate the tubes with the leak?

Ans: Run the system with only shell side fluid, the pressure difference between outside and inside of the tubes at the sites of holes will make the fluid seep in and come out together at the other end. The tubes with fluid flowing out trough the axis opening have a hole somewhere. 

3) Some questions on basic CRE ( JKBs part) 

4) How are tubes attached to the tube sheet?

DS

1) Fourier Equation when K is function of T,

2) Which transform to solve it? Hopf-Cole Transformation ( Laplace, Fourier and Legendre Transformation are used only for linear PDEs)

3) A large portion of my time revolved around an open ended question on effective solubility of a mixture of 2 solutes in a solvent when their individual solubilities are known.

My answer involved UNIQUAC models and how to set up an experiment to find it out. 

 All the best for your VIVA folks! 

Cheers,

AK

On Sunday, February 8, 2015 at 6:37:18 PM UTC+5:30, sanchitsingal84 wrote:

[sanchit singal]

GV Questions - partha dutta

Panel: DM, Sudipto, Sudarshan(didn't even come)...was a written viva(sounds strange)...18 qns. in 50 minutes...

1. Gibb's-Duhem relation.

2. What is Departure function?

3. Reason for offset in P-controller.

4. Any equation for a non-ideal gas. (I wrote Van der waal eqn.)

5. Three cases: Pr=1, Pr1. Draw Thermal and Hydrodynamic boundary layers.

6. Plot of Utility Cost and Capital Cost vs. (delta.T)min .

7. Plot response of 1st order system for step input change. What is time constant?

8. Significance of terms in Navier-Stokes eqn.

9. Bubble point calculation.

10. Any 1 law of crushing.

11. Criteria of (CP)hot and (CP)cold above and below Pinch temp.

12. Principle of working of Rotameter.

13. For reversible Exothermic rxn., if T increases, will equlibrium conversion increase or decrease?

14. Significance of Schmidt No.

15. Unit of rate constant of n-th order rxn.

16. State Henry's law.

17. Difference between Nusselt no. and Biot no.

18. Derive critical velocity for Ball mill.

--Partha

 KMJ's viva 

 Panel-Swati Neogi, Saikat Chakraborty and A.K Jana

Swati Neogi-

1.) What is the driving force for Mass Transfer? A. Chemical Potential. 

2.) What is Chemical Potential dependent on? A. Concentration difference, Nature of Chemical Species, Temperature, Phase, Pressure etc.

3.) Write Fick's Law

4.) What is the analogous term for diffusivity in heat transfer and momentum transfer? A. Thermal Diffusivity and Kinematic Viscosity (Write their formulae as well)

5.) Basic Questions on Dimensionless Numbers.

A.K Jana-

1.) Do you want interesting questions or questions based on book knowledge? Do not act smart and go for interesting questions. I tried which led him to ask me a design problem on Distillation Towers. I had to retract my statement immediately

2.) Favourite Subject? A. Thermodynamics (Yes, I love ThermoD, deal with it.) Key is to drag him into unfamiliar territory and ThermoD works well to achieve that objective.

3.) What is the importance of ThermoD? A. Speak something on the lines of Equilibrium, reversibility etc.

4.) Name few kinds of Equilibrium? A. Phase Equilibrium and Chemical Equilibrium

5.) Write the multicomponent phase equilibrium equations in a non-reacting system?

6.) What is Chemical Potential dependent on?

7.) What does saying that " The reaction, A+B->C has reached Chemical Equilibrium" signify?

A. I am not going to give the answer to this. If you are so dumb to not be able to answer this question, call IIT authorities and they will take your degree away. 

8.) What is reactive distillation? I was lucky to have read this on Quora before (Thanks Quora!) 

9.) Another question based on an application of reactive distillation? Thankfully, it was the same Quora question. No, I am not finding that question for you. Deal with it.

Saikat Chakraborty-

1.) Write the formula for Michaelis Menten Kinetics?

2.) Write the formula for the same with Competitive Inhibition? Did not know the answer, tried to derive it in front of him, he got bored and changed the question.

3.) Some arbitrary question on how to achieve the maximum concentration of S in a reactor? Can't write the question in a comment. Call me and will tell you.

4.) Difference between non-ideal reactors and ideal reactors? A. Don't know about PFR but in CSTR, I explained something about the bell curve between residence time and no particles. 

5.) What is the explicit Euler method? Did not know the answer

6.) Some question on what does the Eigenvector in a Langmuir equation like thing signify (He gave the equation) signify? Did not know the answer. 

Basically Saikat focuses on reaction engg and ODE-PDE. Most hellish part of my viva due to the questions, Saikat did not try to psyche as written in previous year questions. Found him to be congenial. I found Swati to be more aggressive. (Might be due to my lacklustre performance in my BTP)

--

[Abhishek Malhotra]

Panel : VHP, SNG, JKB. Mentioned questions not mentioned previously

JKB

micromixing

CSTR in series model for non isothermal

affect of micromixing in dispersion no

calorific value, LPG

LPG composition

semi batch reactor

SNG

how to solve odes both numerically and analytically

stream function 

how to write equation of a streamline

NPSH

VHP 

stokes law ( not eqn )

cstr or pfr how to decide ?

--

Regards,

Abhishek  Malhotra,

Department of Chemical Engineering,
Indian Institute of Technology, Kharagpur.

[Jyoti Prakash]

Panel- Swati,Jana,Saiket

Saiket-

What are the ideal reactors?

Why those are ideal ?

Examples of ideal and non ideal reactor.

Michaelis Menten Kinetics

Basic reaction set for --uncompetetive,noncompetetive,substrate inhibited,product inhibited reactions

Zeroth order reaction, will it continue forever??

            

Swati Neogi- completely same as others(Dimple,Navya,Mayank)

           

Jana-

Asked best subject?

I told him to ask on pumps and Heat exchangers but no subjects.

Working Principle of a centrifugal pump, Req NPSH, and how is it related to vap pressure.

What is vap pressure relate it to Roults,Henrys and Daltons law. 

Use of baffles.

Advantages and disadvantages of baffles.

        

Sincerely,

Jyoti Prakash Behera,

Fourth Year Undergraduate Student,

Department of Chemical Engineering,

Indian Institute of Technology, Kharagpur.