There are 2 rounds of interviews. I attended only the first one. It was done with 2 engineers and video recorded, and the recording would be sent to HR for assessment. Questions included your 5-year plan, your understanding about the position, why would you want to join Exxonmobil, some personal expierence. etc.
One of my friends has passed the first round interview. His 2nd interview was done with 6 interviewers from different departments.
PS: Be prepared for waiting. My appointment was 1:45pm but I waited for an hour until someone came out and called my name.