BEFORE GIVING ANY PSU INTERVIEW I SEARCHED A LOT FOR THE QUESTIONS ASKED BUT I ALWAYS GOT INSUFFICIENT QUESTIONS. SO THIS IS MY ATTEMPT TO BRING YOU PERSONALLY EXPERIENCED QUESTIONS. I ALWAYS UPDATE IT BY GATHERING INFORMATION FROM FRIENDS TOO.

SO DO COMMENT AND FOLLOW ME FOR MORE EXPERIENCES AND VARIOUS INFORMATION.

DRDO INTERVIEW (JRF)

Monday, December 31, 2018

⏩DRDO IRDE(Instruments Research and Development Establishment),Dehradoon.



Interview Date:16th Sept 2018.(JRF).

   This is the lab where I got selected as JRF.

Though this is my success story, you can learn from my first Interview where I made so many mistakes.Because , once Dr. A.P.J. Abdul Kalam said ," Read failure stories ,not the success stories you can learn from them".

  For this first of all they put one exam. Scheduled on 10 o clock. after the exam interview was there for selected candidates only. Exam timing was of two hours. 

   My train arrived late at Dehradoon station. I was totally new in that city. To find out the laboratory it takes time and I was 40-43 minutes late for the exam. when I went to the center, they refused to allow me for the exam. I was requesting them "I came here all the way from Maharashtra. And the train was late ." Meanwhile, an elder person said, "okay, hurry up just sit for the exam. rapidly fill the form first. But you will not get extra time".it took around 5 minutes. Totally I was 50 min late for the exam.
   There were 10 questions common for all branches and next 50 questions were of particular branches. There was no negative marking so I solved all questions very fastly. All the questions I felt easy maybe because this time I was fully prepared. Around 250 candidates were there for the exam and vacancies were 5.
In the afternoon 3 o clock they displayed the result, My name in the list was 11th.
   I had taken a MADE EASY handbook for the revision of concept along with me. I suggest you that book for the concepts. For rapid preparation. 
   On the next day morning interview was there. I made one friend there named Krishna(Himachal Pradesh). We both seek for residence. There were two Dharamshala which were cheap. Because it was a tourist place hotel prices were not affordable for me. But in dharmshala no vacancies. One autowala helped us to find out one cheap but good in condition room. We both studied in the night, asked questions to each other.
    In the interview...
   As I entered in interview hall. That person who allowed me for the exam was chief of the interview panel. He identified me, "you,    are the one who was late for exam right?".. I said "yes".
"Still you got qualified." ...good.
   Then he told to other panel members about that. Exam takers were different people and interview panel members were different only that chief was common.
   One of panel member said, "impressive...!!!"
       I think half the battle I won here itself.
 They started questioning.

1. Tell me your favourite subjects.

EDC,Digital ,controls.

2. Types of ADC?

This was my weak part in digital. I murmured," slope...something... something...".
  One lady panel member was encouraging me. "Yes, you r right go ahead".
 I had not read about this last night but I knew the names I could not remember there.

3. What is quantization noise?

   I said "no".

4. Can you draw BJT symbol?

I thought now they are making fun of me. I politely drew the symbol.

5.If you put two diodes attached, will it act as BJT and why?

I knew the answer. Its as it is given in ACE academy notes. 

6. What are the applications of BJT? 

  Amplifier, switch.

7. What are the universal gates?

The favorite question of DRDO scientists.
"Nand, Nor".

8. Can you draw universal gates using other gates?

Yes.

9. By using which law?

De Morgan's law.

10. What is the zener diode?

I said,"It is connected in reverse bias.
It works on tunneling effect.
Used as a voltage regulator."

11. What is phototransistor?

I replied, "It works on photoconductive effect. When light falls on it. Current flows."

12. What is a relay?

It is a isolator ,used to connect low vtg ckt to high vtg ckt.

13. Tell me the working of wifi.

"No."

14. Types of modulation?

I told.

15. Which is efficient ASK,PSK,FSK ?

PSK.

16. You have to creat a square wave what you will do?

Actually they were expecting ring oscillator. But i told "by giving sine wave as input to comparator" 
I could ans this que becoz i came across such a numerical in previous year GATE

17.What is CFL?

I confused. I murmured,"cloroforo....no".




18. Tell me about CRT ?

I could tell them only full form. Cathod ray tube.


19. They given one graph to find the equation of it.

I derived the equation but i dont know it was correct or wrong ,they also haven't commented on it.

20. Then they asked me about my family background. Residence.....

Finally said", can you join if we select you?
The mad only will say no.
Then they said thank you. And told me to tell outside that dont send next candidate for 2 minutes.
  Here only i came to know that im selected.
While leaving room i said,"maam  I know that ADC types".
   She,"then tell me".
"But as of now I couldn't remember".
She said "okey no problem. Best luck."
 After few days admin officer called me and said im selected............





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