I interviewed with a second-year who works in admissions. It was very informal, and lasted about an hour. Below are the questions she asked me:
-Walk me through your résumé
-Tell me a time when you faced a conflict
-Tell me about your leadership style / how did you develop it?
-Why Kellogg? Why MBA?
-What do you plan to do after school?
-What will you contribute on campus?
-What questions do you have for me?
Then she asked me a few questions about two items on my resume.