International interview questions

Hiring manager asked about the experience and some purchasing question. I start at the wrong foot by let him ask all the question until he realized I don't less expereince than what he's expecting.

The process started with me applying for a calibrations engineer position at the company after completing my Master's degree. I got a call from the HR manager and had a brief interview on the phone. This was a very short interview and an initial screening in the process. She then forwarded my resume and credentials to the hiring manager of the department where the position was located. The hiring manager took a small interview on the phone inquiring about my experience and education. I was then called on site for a final interview which consisted of two managers from the same department where the position was located. After clearing the on-site interview I got a call from the HR manager again saying the interview went well and its a go ahead from the managers.