Most of the questions were technical with objective answers. This is expected for an engineering position and they were all fairly straight forward. The most difficult portion of the interview was the open ended scenario based questions. Basically, this gives the employer a chance to see how effective your problem solving skills are. What really makes this difficult is that there is no "right" answer but there are a lot of "wrong" answers. In short, be prepared to think about the questions asked; memorizing trivia will not help.