Sounds oh, so familiar!!! We do Invensys. I worked for a company who had Alerton in the past. I also worked at Nailor Industries in Houston for several years dealing with all their controls issues- people sending in VAV controllers for us to install, configuring our own in-house DDC controls, pneumatics and analog electronic controls. It was all pretty interesting.
I've been out for 9 years and really haven't done much heavy-duty engineering, so the test was rough for me as well..
I actually took the machine design in the PM. I had planned on it, but then decided I might do HVAC. When I read the MD portion, I was like, holy cow, this looks rough, after skimming through all the questions. Then I started skimming through the HVAC and started to work them. Then I realized that was maybe even more rough. I went back to machine design after losing lots of precious time....
I'm nervously optimistic! You are an ME, right?
Ed