how many hours did you have when you took your initial interview? I got my restricted 10 years ago and haven't flown since.. you think with this (lacking) kind of experience they wont get to technical? Still ask questions about jet systems I would assume?
I had 85 hours TT when I did Stage 1.
They will definitely get technical with you sooner or later, so try to read up a bit on jet systems etc. The purpose of asking you these things is to see how you react when outside your comfort zone. Obviously they also want to know if you have done any extra reading outside your level of experience. They probably don't expect you to know the answer to such questions, but that is the point of it all - they want to see if you will try to find a reasonable answer, or just sit back and fold your arms. If you read my list of Stage 2 and 3 questions that I posted a while back, you will see I got a lot of jet-related questions despite all my flying experience being on single-engine piston aircraft in day VFR.