Apple Hardware Engineer interview questions

Initial "informal chat" that was actually an interview on campus. Asked a mix of technical questions (stress/strain diagram, necking, etc) and design questions based on an example in my resume (they asked me to redesign a project I'd worked on based on fake client feedback). And a brain teaser. Some discussion about finite element analysis work that I'd done after my freshman year and some in-depth questions on how FEA works. Second interview was 30m phone interview with 2 hardware engineers. I expected technical questions but got none. The interview was all about how my design process works, and was rather ambiguous.