I had two phone interviews. The first was with the HR manager which was fairly easy. The second was with the lead electrical design engineer. He asked more technical questions.

Not too stressful. I got an email to visit them at the career fair at my college. I talked to an Engineer and he took down a lot of notes to take back to the office. Over the next 4 weeks I had 3 phone interviews with the HR coordinator and HR director and a skype interview with the lead design engineer. The questions weren't too technical but at the same time covered some basics of electrical engineering to have an idea of the candidate they are looking at. A lot of the questions made me seem that they were trying to see if i would fit in the team more than just raw technical knowledge which i really liked.