Imagination Technologies Hardware Engineer interview questions

I was interviewed via phone by an engineer and an HR manager. They asked me some very tricky questions about HW design. The answers were not so obvious. Also, due to the phone I couldn't sometimes understand the Engineer (he had also heavy British accent). The questions were actually problems of Digital Design. Also, they asked me about my past projects and my studies. Finally, the HR manager asked me some general questions like: "Why did you apply for Imagination Technologies", "Tell me about your strong and weak points." The interview last for about an hour.