In New Pal, you can still listen to Fire/EMS. They haven't moved to Trunking yet. Also Richard has a CHIRP file if you want to use what the rest of us are using. Good luck studying for your test. Also checkout Shortwave radio
I work at a large southern Indiana engine manufacturer for diesel engines ;). I test the engines in a lab all day and I have learned a few things. Exhaust leaks. DO NOT run it in your home! a seperate area is ideal. Concrete block walls and a heavy steel door will quite down very large engines...
I have seen cheap Military Diesel Generators on government liquidation sites in the past. They have been auctioning them from Stout Airfield last I saw. Could be a bit of overkill though...