They asked 10 undergrad level textbook problems from heat transfer and fluid flows. It doesn't make much sense to me to do this for a job that requires a PhD. I didn't know how to answer some of them since it's been years since I have used this, but I could have done it in 30 minutes if I could use the internet/textbook. I see no point in such interview, highly disappointing.

was told, interview would be basics of fluid mechanics/thermodynamics. Was given to solve numericals related to heat transfer and fluid mechanics during the interview.Second round is usually behavioral and the final round is a PPT round with the team.