IIT Delhi Interview Experience

Within a week of returning from IIT Kanpur (click here to see more), I had to rush to IIT Delhi.I had applied in the below specializations at IITD:

  • MTech in EE Dept – 1) Integrated Electronics & Circuits 2) Communications 3) Computer Technology 4) Control & Automation
  • Interdisciplinary MTech in VDTT ( VLSI Design Tools & Technology )
  • Interdisciplinary MTech in JTM ( Bharti School of Telecom Technology & Management )

I did not get a call from IEC and Communications at IIT Delhi as the cutoff for interviews was very high( 910 & 860 respectively ) compared to previous years.Slightly disappointed by this, I reached IIT Delhi one day before the interviews ( 14th May ).

VDTT (15th May):

After verification of our documents ( the only IIT where our documents were actually verified πŸ˜› ), I was the first one to be called for the interviews.First and last ones to go are always at disadvantage. I had heard this before, but I realized it only after I entered the room.It was a one-to-one interview.The professor asked me what was my GATE score and whether I was a University Topper.Then he started with the questions.Much to my relief, I answered all of them pretty well but luck had just turned its face away from me. Suddenly this prof. had to go in an urgent meeting; he was replaced by two other profs.Unfortunately, the first prof took his laptop and with it the Excel Sheet which recorded my performance till now.This chain of events distracted me a bit. I was not able to answer the remaining questions with confidence and hence failed to satisfy them.The questions asked by them were:

  • A long network of R,L,C elements was given and I was asked to find the voltages at each node and currents in all the branches at steady state and switching instant of a step input.
  • Write a program to find the maximum and second maximum in an array of elements along with their array indices.
  • Realization of given driving point impedance function, Z(s) = (s+3)/(s+2).I realized it using R and L; asked me to do the same with R & C. Then he asked if this function can be realized by L & C elements. If not, why?
  • Draw the basic CE amplifier and explain the role of each capacitance in the circuit. How will you choose a suitable value for the emitter capacitor ( bypass capacitor ) practically? Give a formula.
  • What is a phase locked loop? Draw its circuit.
  • Circuit for CMOS inverter and its VTC.
  • If input and output of a CMOS inverter are shorted what will happen? Show it graphically on the VTC.

My interview lasted for about 1 hour and it was the longest for any candidate.But, I failed to qualify for the next round of sponsor’s interview.

JTM(15th May):

At about 6 pm on the same day, I had my second interview.Each of the candidates was supposed to fill his/her primary and secondary areas of interest in a form before the interview.I filled Wireless Communication as my primary and Computer Networks as my secondary areas of interest.The questions I faced were:

  • What is a fading channel? Explain.
  • What is multiplicative noise ? Explain with the help of equation and diagram. How is it different from additive noise?
  • Draw the constellation diagram of 8-PAM.They gave an alternative diagram to the one I drew and asked me which one is better and why?
  • Draw the constellation diagram of 8- QAM and 16-QAM. What are the merits and demerits of both?
  • Calculate the energy required to transmit for both the constellation diagrams.
  • What is the condition for orthogonality in case of M-FSK? Write mathematical equation and explain.

My interview lasted for about 30 mins.The interviewers were very kind and co-operative.I would also like to appraise the wonderful job done by the coordinators in conducting the interviews in a very systematic and organized manner.I think my experience of working in a telecom company came to my advantage here and I was not surprised when I saw my name in the list of selected candidates πŸ™‚

Computer Technology ( 16th May ):

While applying I haven’t even seen what this course was about and hence hadn’t prepared a least bit related to its interview.So,on the night before the interview, I decided to take a glance at its home page to know about it.The more I learnt about it ; the more I started liking it and the more I repented of not preparing for the interview and missing out such a golden chance.Computer Technology is a specialization which takes 50% of the students from CS and the rest from EC/EE. Being an EC student one tends to get away from coding related questions as much as possible; leaving that front for the CS guys to score.So, the competition was more here and my anxiety was growing with every passing moment.Anyhow,when my turn came, I got up with a positive attitude and decided to give my best shot.

When I entered the room, I was met with a pleasant shock. My panel was the same as the previous interview. The professors identified me immediately and beamed at me. They asked me what will I choose between CTech and JTM. They told me that both the courses are almost the same in content and even most of the faculty members are common for both.The results of JTM were not out yet, so I replied that I would like to be interviewed for CTech also and then decide based on the outcome. They were quite generous to give me a chance and started their questions:

  • What is CSMA-CD and CSMA-CA? Which one is used in GSM?
  • What will the maximum and minimum packet size limit for a CSMA-CA network.Give formula along with proof.
  • What will the maximum length of an IP packet between any two points A and B in the network?
  • What are the different sorting algorithms ? Order of complexity of each.
  • Write a program for merge sort.
  • What is channel coding? Which layer is responsible for that? Justify.

They also asked me the questions which I was not able to answer in the previous interview. Obviously, they figured it out that I was quite lazy to search for the correct answer; that too in a single day and didn’t ask much about them. The interview was good ; but I was skeptical that they would select the same candidate for two courses. I was happily proved wrong when they declared the result πŸ™‚

Control & Automation ( 17th May ):

Well, frankly speaking I went to this interview only to kill my spare time. My flight was in the evening and I had no work to do in the hostel.I was not interested in this course; and so was quite chilled out before the interview.I didn’t even care to do the formality of touching my friend’s book the pages of which she was turning hurriedly.There were four persons in my panel.One of them asked me why I left my job and what will I do if I failed to get admission in an IIT? To this I replied that I am positive that I will do. He was impressed by my determination and started asking questions:

  • What is a homogeneous equation? Questions related to eigen values and eigen vectors.
  • Definition of an LTI system.Give mathematical equations along with examples.How is principle of homogeneity mentioned in my definition related to the homogeneous equation AX=0?
  • Can an LTI system be unstable? If yes , how. If no, how?
  • Draw pole zero plot of lead compensator. what is the difference between lead compensator and PD controller?

The interview was obviously not good, but to my surprise I was placed in the waiting list for admission. πŸ˜‰


  • IIT Delhi is the best for placements along with IIT Bombay.
  • It is the chillest IIT in the sense that professors are quite cool and there is not much load ( compared to iitk,b,m ). So, you can enjoy your two years of college fully.
  • For those of you who are aiming for IAS, IES, PSU’s IITD is just the right place for you. Just outside the IIT gate you will find ample coaching institutes for all types of exams and we all know that Delhi is the best place for preparation of Civils and PSU entrance( Note: I highly discourage leaving an MTech program midway to join in somewhere else which leads to wastage of seats in IIT’s)
  • The research work in some courses of IITD is one of the best in India ( e.g. computer vision , image processing, robotics ).So, for people who want to do PhD in these areas you will get lot of resources and good references. Also, VDTT program conducted by IITD is recognized as one of the best in its kind where you get the chance of getting specialized training by the industry people and sponsorship as well.
  • Location of IIT Delhi offers a huge advantage with all historic places, airport,markets and other places to roam around and eat within few radius of the campus πŸ™‚


  • The hostels of IIT Delhi ( talking of the girl’s hostel ) are not so good ( compared to iitk,kgp,b).You will have to share room with two other people ; which might be troublesome if you are not used to living like that.
  • The food in the mess of the girls hostel was not good(everyone seconded this opinion ). Though you always have the option of eating in canteens and having yummy mango shakes πŸ™‚
  • IITD pays more weightage to GATE score for shortlisting candidates for admission.This is what I heard and also observed myself.This doesn’t mean that if your GATE score is less you won’t be selected. It just means that you have to be very good in your interview.People with high GATE score, even if you fail to give your best performance you might still expect an admission call.

Phew!! This was a long post. Hope it helped you in some way.Coming next are my experiences at IIT Bombay and BARC. Till then good luck and have a nice day.Keep visiting πŸ™‚ πŸ™‚



23 thoughts on “IIT Delhi Interview Experience

  1. Pingback: BARC OCES/DGFS Interview Experience | MUSINGS…

  2. It is a good idea to pen down thoughts and experiences. It is better to publish and have a copy in shelf . It is the best to post (as you are doing) for others gain for free. All the best.


  3. Pingback: Conclusion | MUSINGS…

  4. Pingback: IIT Kanpur Interview Experience | MUSINGS…

    • Hi Kris..As I mentioned, I can’t share my own experiences..but as per the feedback received from others, they were asking more about the projects and basic HR questions.TI was a bit more involved and asked in depth the concepts of analog and digital design.


  5. hello disha… thanx a lot for guiding us all d way…ur posts indeed are complete and very helpful..
    I had some doubts regarding IIT DELHI- bharati school of telecomm and technology n management..
    how do u rate getting an MS or Mtech degree from BSTTM regarding future prospects,placement or PhD..
    Thanx again… πŸ™‚


    • Hi Suravi..Glad I can be of help πŸ™‚ The scope is pretty good from both placement and further studies … You just need opportunities ; eventually it comes down to your own perseverance and hard work πŸ™‚


  6. Very usefull post . can you please share your JTM (Telecom technology and management) interview experience too.
    if not completely remember then atleast what sort of topics do they ask in this ??


    • Hi Gaurav…I didn’t use any extra book to read wireless communication..Since I was working in a telecom company I had working knowledge about the field .. at BTech level we had Rappaport as part of our curriculum for wireless education


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