I worked at Hindustan Petroleum part-time
you will have a lot of skilled people working around you
as it is a oil refinery you will feel very hot in that environment
I applied online. The process took 3+ weeks. I interviewed at Hindustan Petroleum (Lucknow, SC) in May 2015.
7 people in the interview panel . Questions were mostly HR type only regarding college life and your favorite moments. Do remain confident and speak your heart. They do not want to hear philosophical crap but what you really are. Mostly they are looking for Marketing profiles however refinery and r&d profiles are also open. They may ask your option during the interview.