Piper Aircraft Engineering(Fall) interview questions

I applied through their website and got a call within 2 days to set up an interview. The interview was pretty short and standard. Mostly went through my resume and one or two standard questions (describe yourself, etc). I was also asked a specific technical question on the refrigeration cycle ,which was listed on my resume (so be ready to talk about specific things on your resume), though I do not think I was going to be working with that at all. The job itself was not explained at all. The engineers I interviewed with over the phone seemed to be in a hurry as the interview only lasted 15 minutes. I did not think I would get an offer due to the short interview and the lack of explanation of what I would be doing there but within 2 days I got an offer and was giving two more days to accept/decline.