Siemens Graduate Engineer Trainee interview questions

It was a 3 round process. 1st: online assessment of technical skills which was again including 3 different sets of assessments. 2nd: Technical interview round which was taken by two interviewers and they asked to explain the concepts using pen and paper with in depth elaboration. 3rd: HR round. It was also very easy round. they were really impressed because of the way I explained the things they asked me.