Texas Instruments Internship interview questions

I received an email from a TI recruiter without having applied to TI before who was interested in a project I had on my resume which he found through my TI-sponsored research program at school. He forwarded my information into a project manager who interviewed me a week later. It was a WebEx Meeting. The interviewer did not ask me any behavioral questions, and went straight into the technical questions. The first was a buck converter, and I was asked ambiguous questions about the topology. The answers I gave were acceptable, but not what he was looking for, so he would ask me to clarify over and over. After the interview was complete, I received an email from a recruiter asking me to fill out an actual application, since I had never applied in the first place, and I never heard back from them.