The interview was very rigorous. I had a GD round with an simple topic (Automation in different fields) and then an HR round and Technical round. But in both, technical questions were asked. The questions were asked to know my Basic knowledge from all core Mechanical subjects. You will be asked your area of interest and only for those answers will you be judged. I am an aeronautical student and hence was asked questions involving my stream. If you have a very good grip on the basics and it's understandings, the interview will be a piece of cake.