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ISRO SCIENTIST INTERVIEW

Friday, January 18, 2019

⏩ISRO( Indian Space Research Organisation ) , Delhi.

Interview Date: 22nd Nov 2016.
Selected as Scientist SC in ISRO.









Hi, I am Navneet Kumar.

As I entered the room there were about 8-10 interviewers sitting on the other side of a U shaped table and in front of them in a chair, I was supposed to sit and answer their questions. First, the Chairman asked me for my introduction which I gave very briefly, then he asked me 3 of my favorite subjects.

I said " Digital electronics, Signal theory, Electronic devices".


Digital expert asked me the following questions-

1)What is FPGA?

I did not know much about it and just gave him its full form.

He said" explain its functionality "

I went silent and said I don't know sir.

2) Have u read about logic families?

Yes, sir!

3)which is the fastest logic family and why?

(I gave a good answer and he seemed satisfied)

 

4)why CMOS is used more in practical applications?

I answered it well

 

5)Explain Noise figure, Fan out etc etc..

I answered them 

6)Difference between DTL and DCTL?

I explained DTL but had not heard about DCTL till then! so he let me go with that.

 

7)Explain SRAM and DRAM?

I answered it.

 

8)What are PLDs and what is the Difference between PROM and PLA?

I answered it decently enough.
Then he passed on the baton to signal theory expert.

 

9)what is Digital signal processing?

I somehow tried very hard to explain it which was certainly not enough for him and he asked me a counter question.

 

10) why DSP is used?

I had not prepared anything for that so I could not answer it.
he said, "it's okay if you don't know".
Then came from out of the blue "Analog electronics expert".
I was sent to the whiteboard right behind my back.

 

11)Design straight line equation y=mx+C with an op-amp?

I made it and he said, "Don't you think it'll have design issues, I saw my design and gave one alternative solution to which he was fairly satisfied."
then he quick-fired me with 4-5 op-amp theory questions like Slew rate, CMRR, gain bandwidth product etc atc.. (I answered them all)

Chairman then looked into my BIO-DATA form and said, "You made a project on 8085 microprocessor?"

"Yes," I said.
He asked me to explain it?
I explain it to its entirety and he was okay with that
Then he asked me some project specific questions like:

 

12)why did you use RST7.5 and RST6.5?(I had used interrupts in my project) etc etc..

Then again came the Digital expert.

 

13)Difference between TRAP, RST5.5, RST6.5 and RST7.5?

I answered.

 

14)Difference between EPROM and EEPROM? Which ROM did you use in your project?

I told him the difference and also I had used EPROM and told him why I used it.
As I was near to the board so he thought of utilizing it again.

 

15)Draw a timing waveform through a D flip flop and indicate set-up time, hold time and propagation delay in it?

I drew it and he made sure I make it very neat so that he could clearly see every delay in detail and gave instructions throughout in the process.

16)Master-slave FF working, Direct bandgap semiconductor etc..

Then I came back to the chair and chairman said "OK! you can go now"
"Thank you", I said.


I was giving interview unhurriedly and was keeping calm in answering every question. Also, I gave all my answers in English so I think it's better to answer them in English as most of them are comfortable that way.
Being spontaneous is very important as they don't give much time to think.

I scored 129/240 in written (51 attempted 45 correct 6 incorrect) and got 74.40/100 in the interview and was at panel position 66/201 after the interview.

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