Non-Modeling Private Equity Case Study Interviews

Hello all - I have a final round coming up for an infrastructure fund focused on telecom, airports, roads. I have read a lot of posts on modeling type of case studies and am comfortable with those, but can someone provide tips or general idea of how more on-the-spot type of case questions would like?

I'm currently guessing market sizing type of questions or modelling approach? I frankly have no project finance experience, just TMT experience for the most part, so any tips / pointers would be appreciated. Thank you!