ExxonMobil Research Engineer (PhD) interview questions

I got an invitation for an onsite visit. I arrived the night before the interview day and I was invited to an unofficial dinner (which I believe that it was an important part of the interview--even if they call it unofficial). The next day I gave a talk early in the morning and met with several team members and team leaders (You are expected to wake up early in the morning e.g. 7.30 am give a presentation at 9.00 am and get done with the interview at 5.00pm). It was a very nice experience