Many reqs are a waste of time. They already know who they want to hire. The company typically uses job requisitions to show that they are really looking for the most qualified. If they want you, they will ask easy questions. If not, impossible questions designed to make you fail the interview. Hr looks for words in your resume that match the job req. Hr is the first gate keeper. Hr has no knowledge of engineering, yet they are the gate keepers.

Why do you want this position? What are your weaknesses? Give examples of solving problems.