I don't remember the exact questions I was asked, but I believe there is a pretty standard set of questions they choose from. I googled types of questions they would ask and prepared answers for them ahead of time and I'm pretty sure I only received one question that I hadn't prepared for. Sorry I am not much help and don't remember specifics, but they were relatively easy to find on the internet, I think I found some on glassdoor.
If you're being hired as a tech trainee, I was asked really the same questions I've been asked for any other job. What career path I was on, strengths and weaknesses, availability, the most challenging and the most rewarding situations I've been in at work.. that's it really.