Qualcomm interview questions

got an email to schedule a phone interview. The phone interview was based on C questions: bit manipulation detect overflow static identifier stack configuration when a function is called semaphore and many OS questions : cache coherency, mutex, deadlock, spinlock, Paging

I had 2 phone interview each one about 1 hour. It followed by an on site interview in San Diego. They allowed my one hour presentation about my PhD work. and I had 1:1 interview with 7 member of a team. They ask technical questions but not related to what you do and each one mostly ask about what they do in the team.