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.

BARC SCIENTIST INTERVIEW (SELECTION THROUGH GATE) ,DGFS

Monday, January 28, 2019

⏩BARC 


B-Tech -ECE.
GATE SCORE 736.
Applied for DGFS-09.
Got Medical slip.

Interview Date: 2 July 2009

IGCAR KALAPAKKAM.

This is Raghavan.
Interview panel consists of 5 people but one of them was checking my certificates only. Remaining four interacted more. Just before attending the interview I got admission in IIT-KGP. But it was not there in sponsored courses list.so it was my first question. 

1) IIT or BARC?

I said BARC.


  When the interviewer asks you such type of questions then a youtube video
          A Talk With Shubham Dabir
will help you to tackle them. In this he has given 4-5 PSU interview experiences as he is GATE 2017 topper (AIR-75).


  Now they asked me to tell them if I knew what type of questions being asked by the panel to previous interviewees.
This was a shock for me. I said I remember one. Asked me to tell the question and solution. I told.
Then I was given a block diagram. Input is the clock. Output should be 

00 , 01 , 11, 10 .

I was asked to design that block and derive it step by step.
 Next they asked me to pen down my fav 5 subjects.

1. Networks

2. EDC

3. Digital Electronics & Microprocessor

4. Analog 

5. Control Systems.

Then they asked me questions like.

2) If we want to indicate 0 and 1 using glowing LED, how to do that?

3) how LED works?

This is one of the favorite questions of BARC scientists.

                       


4) how do you drive the LEDs with your block.

Do you need extra cost? If so design that. How much current does a typical gate output would be?

5) some typical questions on TTL logic.

Voltage level, fan in, fan out ... And so on.
How you will get the power supply for your gate.

Then that question stretched to the topic like AC generation.
Conversion to DC.
Rectification and Regulation.
Zener diode construction and working principle.

6) Application of feedback in voltage regulators.

For all these questions I asked to draw block diagrams and asked to explain their level of satisfaction.

7)Now they came upon OP AMP.

Pin diagram of 741.
Design voltage amplifier of particular gain.
Inverting, noninverting...How will you get that gain?
How can you apply KCL directly at an opamp input terminal?
Ideal opamp circuits.
Why opamps are not ideal?

DC defects of the opamp in a voltage amplifier.

What happens if we interchange the connections to pin 2 and 3.

Draw output. Power supply voltage range. Saturation conditions. A range of resistance in the feedback path and input terminals.

8) Explain LPF ckt with an opamp.

Draw output for some typical inputs.
LPF with passive components?

9)what happens if few resistors/capacitors are added series/parallel?

And output for some typical inputs.

Finally, one irregular signal was shown. 

10) suppose this is voltage across capacitor/inductor

Derive and plot the current waveform for each.


I was asked to leave after that and asked to wait for 5 min. Later I got a medical slip, thank God. I can't describe.

They didn't ask about my project.
My interview lasted for around one hour. Throughout my interview, sometimes I could not recollect and answer some questions in a flash they made me think.
Provided me enough hints.
My panel was amicable but sometimes I felt that I'm nowhere, I'm not up to the standard they wanted. Overall it was a very good experience...!!!

  Here you can find Electrical Interview Questions.