I applied online. The process took 1 day. I interviewed at Indian Oil (New Delhi) in Jul 2019
Interview
After clearing the GATE exam, you have to apply in Indian oil, then if you met the criteria, they call you for an interview, the interview process includes group discussion and technical+ personal interview.
Interview questions [1]
Question 1
They asked about how am I doing, why did I take drop in studies and they also asked about my family and hometown.
For technical they asked about different type of sensors and transducer, some questions were from control system .
They ask about your project so prepare that.