Indian Oil Production Engineer interview questions

Indian Oil shortlists candidates for interviews based on GATE scores previously it was based on all india entrance test. I attended the interview on aug 2008. Typically the process has one GD/ Group activity, one technical interview and one HR interview. The technical interview will be mostly from basics of engineering. For chemical engg read about pumps, distillation and heat exchangers. Reading a little bit about the company from its website will be usefull