NVIDIA interview questions

I got the opportunity via my college. The first round of screening was a objective type set of questions. It had 4 sections i.e. c/c++, OS, DS, Aptitude The interview consisted of questions about Projects mentioned in resume, c++ and data structures. It was a long one. The interview is long enough to test your depth of knowledge. The interviewers were quite friendly and made environment comfortable.

1 phone interview, 5 on-sight interviews 5 interviewers interviewed me back to back for 4 hours The phone interview went nearly 45-50 min Each on sight round was for 45-50 min without any break The HR services there is pathetic - 6 emails and 2 phone calls, which they didn't answer, from my side and then they give me the result that too without any solid reason. If I was not fit for the role why did they keep me hanging for nearly a month without any intermediate update. If it takes so much time to make a decision, I doubt the skills of hiring team