MIT Signal Processing Engineer interview questions

Interviewed for an entry signal processing engineer position. Came in around 9:00am. Waited for a few minutes in front lobby while they gave me a security pass and called the HR coordinator. When the coordinator came, she took me in and walked me to my first interviewer. Ended up interviewing with 4 individuals, and then had lunch with a couple other folks working within the same group. Finished up around noon or 1:00pm. All in all it was a pleasant experience and I enjoyed speaking with everyone. I thought the interview went really well, but I didn't end up getting the job.