And I'll concur with shugs.... I felt I didn't get many questions about the ability to study, work effectively in a team or any of the other 'qualities' they see as important since I've got good exam results from school, several uni degrees and a good set of experience that provides good examples of these sorts of skills as far as team working, practical learning etc goes.
I did get lots of questions about why I was pursuing this career now, why I hadn't done anything about it before (at other times in my adult life when I could have applied), and was asked whether I thought scientists could be any good at being ATCOs! Are we too theoretical and stuck in our ways - do we know how to adapt and change?! It was one of those experiences when I think they wanted to see how I dealt with being pushed over and over again, and if I would break...
And then I was asked loads of technical stuff, I think to gauge my commitment, interest, knowledge, and especially for them to see how I apply knowledge I have, how I 'think' about things and deal with ever changing scenarios (see above). Some simple questions with straightforward knowledge-based answers, but other open-ended questions too which required good problem solving skills.
Who knows if this'll help anyone, but they were my experiences.