In the beginning they took me to a tour at the technical facilities and then the personal interview started. I was asked technical questions about antennas and there was also an HR member there that asked HR type of questions. By experience I would suggest you to review the results of previous projects you undertook like thesis, know the subject you are applying for and pay attention during the tour because they are going to ask questions about it later during the interview. They didn't want you to remember any details but you need to have a very good sense of the area you are going to work , know the basic principles and be critical about them. Good Luck!!!