This is the major elimination round. Rejection rate is 80%, in my batch of 12 people only 3 succeeded. regarding GD topics, 5 people will be watching you, topics are current general. We were given "finance Budget of current fiscal year" , other batch was given "jan lokpal bill", and "old NITs vs new IITs".
Give ur GD in a sophisticated manner, dont try to interrupt it can be fatal for u . Initiate the GD and give regular contribution, play like a team, its not an extempore. In my group 3 ppl including me makes for the interview.
There will be only one interview, taken by 4 of them members of GM cadre. the interview is technical + HR mix. In technical they start from ur project report and then get deeper into it. then they try to know ur attitude towards chemical plant or refinery, I did my training in IFFCO (2nd year) and SAIL(3rd year) , so ask me which one is good steel plant or the chemical plant. Q2: What you can do at a petrol pump from engineer point of view. Q3: how will you measure density, velocity of flowing petrol. (I am from INSTRUMENTATION AND CONTROL ENGG.), They are foccused on your extra curricular activities more than ur academics.