After all questions were answered there were technical questions that are typically seen from Mechanical Engineering degree exams such as if the flow is this high how will the flow move around here in addition to structures such as pipes and moving gears. Best advice is to practise year 1 and 2 fundamentals for the interview. Make sure to apply all of Newton's Laws effectively to these questions and you'll ace it. One additional note: Don't worry about getting the correct answer for every question. It is more important to be out with the thought process as you go through. I couldn't answer a couple off the top of my head but I brought it back to the fundamentals to explain where I'd go and why I'd chosen to look at the problem from the direction chosen.