I applied for the Control Systems stream. The last stage was the on-site interview after two HR rounds and one technical round.

Technical Round: The questions were divided into clear sections, similar to the telephone interview. They expected you to know the answers thoroughly and to answer most of the questions correctly. I don't remember all of them, unfortunately.

• Find eigenvalues and eigenvectors of a 2x2 matrix.
• Find the maximum area of a rectangle under a curve. You have to write the expression for y from the equation of the curve. Area = x*y. Differentiate, equate to zero, and find the value of x for which the area is maximum. Then, take the second derivative and check if the value of the function is < 0.
• Write a recursive function to determine factorial or Fibonacci numbers.
• Write pseudocode for any sorting algorithm.
• Write an algorithm to draw a section of an arc if the topmost point is (y,0).
• Some inheritance questions.
• They gave me a snippet of code that copies one string to another and asked me what the function does.
• Find the bug in a piece of code.
• Pointer questions, such as *++q and ++*q.
• Draw the responses of differently damped systems for a 2nd-order linear system.
• What happens if there are zeros in the system?
• Lead-lag compensators.
• Lyapunov stability.
• Controllability and observability.

HR and Manager Rounds:

• How are you with working in teams?
• How would your supervisor describe you?
• What do you think your supervisor considers your main weaknesses?
• Can you handle multiple responsibilities?
• What is your preferred supervision style?
• If you could not do any control systems work at all in this role, how would you handle it? Would you be okay with it?

A few HR questions were difficult. I did not expect lead-lag compensator design.

What do you think you will dislike in this job was tough to answer.