This is a very good question

However, there is no standard answer to that. It very much depends on your company, position and level. Having said that, there are still some guidelines we can follow.

I. Technology
For sure, you can ask questions about technical approaches, the company adopting.
II Communication and Management
Certialy, you want to know how people suppose to work together in your group.
III Company
What is about the company, the industry and where should the company move.
IV Position
Why they have this opening, what kind of people they are looking for

Good Luck