Grand Viva 2014 Questions

[mayank sancheti]

Some of the dual degree students wish if BTechs could share the GV questions of this year. Please add your panel and questions to this thread.

Panel: Padmanabhan, Mr. & Mrs. Neogi

Padmanabhan:
Write Navier Stokes Eq., what are the diff. terms? explain.

What courses have you taken? ... Instability etc..
What do you mean by Instability?

What is streamline? State two boundary conditions.

Fugacity? Dalton's Law?

Mr. Neogi:
How do you measure vacuum?
Thermocouple? 

Flow meters? How does Rotameter work? 

What should be the effective thickness of any heat exchanger?

Types of controller? What are feedback and feedforward controllers? 

Mrs. Neogi:

What electives did you take?

Analogy between heat and mass transfer?

friction factor in a pipe?

A+B --> C ; C+D -->E, then draw the conc. vs time curve

Derive PFR and CSTR rate formulae.

--
Mayank Sancheti

Senior Year Undergraduate
Department of Chemical Engineering
IIT Kharagpur 

[Pranjal Goswami]

Panel : Prof. JC, Prof. Atta, Prof. Gargi Das

JC:

Write Taylor Series?

Now, from the Taylor Series, can you derive the first principle of derivative?

What is the series expansion of exponential?

He then wrote a non-homogeneous first order ODE and asked:

What is the order of this ODE?

Is it homogeneous or non-homogeneous?

How do you solve it?

He drew a CSTR and asked to write the modelling equations for the CSTR

What is the transient part in the modelling equation?

Now some IPC, What is the function of derivative part in a PID controller?

Is it always advantageous to have a derivative action? Ans : No, if the errors are small but changing very frequently, then d(error)/dt will be large and would cause unnecessary control action.

What are some temperature measurement devices?

What is the difference between Thermistor and Thermocouple?

In which cases would you use them? what is the advantage of both?

Atta:

Major part of the viva was different kinds of Reynolds numbers and their ranges for laminar and turbulent cases.

What is Hydraulic radius?

What is the relation between hydraulic radius and hydraulic diameter? Ans: Its not D=2R, its D=4R

How do you define Re in case of convection currents over a flat plate?

What is particle Re?

In a packed bed, how do you evaluate the pressure drop?

In Unit operations for size reduction, what is the difference between crushing and milling? 

What kind of forces cause the size reduction?

Do you remember any laws related to size reduction?( I said Bond's, Ritinger's and Kick's law)

Elaborate the said laws, in which case would you use Bond's law?

Gargi Das:

Do you know what is fugacity?

Why is fugacity required? How is it different from the physical pressure read by a barometer?

What is an ideal solution?

How about non-ideal? What causes non-ideality?

Draw a composition vs pressure diagram for a ideal binary liquid mixture.

How about introducing some deviation there?

What are azeotropes?

Will any non-ideal mixture make an azeotrope?

What is LMTD correction factor?

What do you correct using an LMTD correction factor?

Let's say the correction factor is 0.6, what would you change in your design of Heat Exchanger?

Draw a Sieve Tray Layout.

Do you have holes on the whole plate?

Where are the weir and down-comer?

Won't the liquid just flow through the holes?

What stops the liquid from doing that?

Finally, what are some important dimensionless numbers related to convection?

Since I mentioned Graetz and Grasshoff Number for free convection calculations, she asked about their significance.

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Regards,

Pranjal Goswami

Final Year Student

[Ankit Sahu]

Panel - GHK, KUNDU, JKB

GHK

1. What is fourier's law ? write the expression.

2. You have a temp measurement instrument and a lamp & now you want to measure conductivity of a semi infinite wooden sheet of thickness w. How wud u do it if there is no fourier's law.

(Discussed this for 10 minutes+ some HR questions)

Kundu

1.Draw 1-2 shell n tube heat exchanger and some simple design questions.

2.write the LMTD eq for Temp and draw temp profiles of streams (both Co & counter)

3.Critical Velocity (Ball mill) , its formula and significance.

4.HR questions

JKB

1.type of pumps,their working and when to use which one.

2.when to use distillation or extraction

3.fluidflow application in chemical Reaction engineering.

4. thiele modulus

5.relative volatility

6.external mass tranfer eq in packed bed

Regards,

Ankit Sahu

4rd Year Undergraduate Student,

Department of Chemical Engineering,
Indian Institute of Technology,
Kharagpur,W.B.,India. 

[Abhimanyu]

Kundu

Ficks's and Kick's law 

Define work index , Bond law

meaning of 1 mesh , how many microns in 1 mesh

Draw momentum and thermal boundary layers

Suggest a flow meter for measuring slurry flow rate.

JKB

What is fugacity

Conversion in CSTR and PFR

what does plug flow mean

How to measure pore volume of catalyst

RTD curve 

Relation between delta G and equilibrium constant

For decomposition of Ammonia , find Kp , given the %dissociation 

some questions on packed bed reactor

GHK

GHK : which subject should i ask ?

Me : Sir,  heat transfer

He asked just 1 question

Suppose we have a paper cup kept at about 1 m from a vertical hot plate. wind is blowing . Discuss heat transfer mechanisms from the plate to the cup. Discuss which will be the primary mode of heat transfer and what will be it's percentage contribution to the total heat transfer.

All the best... :)

...

ABHIMANYU,

4th Year UG Student,

Department of Chemical Engineering,

IIT Kharagpur,

Kharagpur - 721302 .

[Mithun Chouhan]

Panel : Gargi , Atta , JCB

same as pranjal 

Mithun Chouhan

Fourth Year Undergraduate Student,

[Anand Choudhary]

Kundu sir: 

1. reynold no of particle .

2. about multi component  distillation process.

3. about my industry internship etc.

4. pump and different type of centrifugal pump.

JKB:

1. about type of reactor.

2. FCC column and its functioing and diagram.

3. pressure drop inside the heat exchanger. in which it is more : triangular or square pitch.

4.  parallel reaction .

Hari krishnan sir:

 he ask which area interest you. i said i like petroleum industry.

than  he ask about octane no .

what is knocking 

why knocking occur. 

and type of engine.

On Fri, Apr 25, 2014 at 2:40 PM, Abhimanyu <abhimanyu...@gmail.com> wrote:

[Mithun Chouhan]

Panel : Gargi , Atta , JCB

same as pranjal 

On Fri, Apr 25, 2014 at 2:40 PM, Abhimanyu <abhimanyu...@gmail.com> wrote:

--

Mithun Chouhan

Fourth Year Undergraduate Student,

[saurabhgoel93]

D Sarkar
- Asked me to solve an ODE 

- Type of thermometers and their specifications?

- Steady state Heat Transfer equations ?

- Boundary conditions for a given heat transfer problem?

- Feed forward controller and diagram?

D Mukherjee

- What are the different equations of state?

- What are the parameters in van der waals equation of state?

- How to solve Van der waals Equation numericall? What are the starting approximation?

- How to manufacture NH3?

- How to seperate oxygen from air?

- Different types of joints?

- What is chemical potential?

- How to determine particle size distribution? sieve analysis?

- What is shape facrtor?

- What is Gibbs Duhem Equation?

- What is Gibbs Phase Rule?

- Laws of Thermodynamics?

Saikat Chakrabarty
- What are the different non-dimensional numbers in chemical engineering? What are their significance in each of their fields (mass, heat and momentum tranfer)?

- What are the different types of diffusivities? Rank them in order of their magnitude?

- Write the modelling equations for a non-steady state plug flow reactor? How to obtain solutions to this?

- Asked me to solve a reactor problem... Gave a reaction and asked me to write the condition at which rate is maximum.

- What is Michaelis Menton Kinetics?

- What is difference between competitive and non-competitve inhibition?

[anurag srivastava]

Panel : GHK , Kundu , JKB

JKB

• CGPA
  
• Mole balance Equations for 3 CSTR's in series
• Mole balance equations for 3 PFR's in series
• Difference between a CSTR and a PFR
• What are integral and differential methods of solution
• Dispersion No.

Kundu

• Lots of Bhaat and HR questions initially
• Sieder tate Equation
• Dittius Bolter equation and when is it used
• Darcy's equation and when was it taught to you.
• Driving Force in Reverse osmosis , dialysis and filtration

GHK

• Write your favourite equation
• Now prove this using only thermodynamics ( it was more like an open discussion)
• HR questions
  

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[Vaibhav Bhargava]

Panel: Saikat, DM, DS

Saikat:

1. Reynold's number
2. Types of diffusion.
3. Dimensionless numbers in Heat and mass transfer.
4. Reynold's analogy
5. Unsteady state reactor
6. Michelis mentin
7. Competitive reactions

DM:

1. Laws of crushing
2. How to measure particle size (mesh number etc)
3. Ball mill + critical speed of rotation of ball mill
4. 1st 2nd Laws of Thermodynamics
5. Application of 1st and 2nd laws (1st law in momentum eqn, 2nd in carnot engine, refrigeration)
6. Non ideal gas equation.

DS:

1. Give eqn for 2nd order process (d^2x/dt^2 + adx/dt + by + c = f(t) )
2. Solve this equation.
3. Time constant- how to find?

--
Vaibhav Bhargava

Department of Chemical Engineering

Indian Institute of Technology Kharagpur

Kharagpur, West Bengal, India.