In my experience with technical interviews, the majority of time is spent on algorithm questions. This was especially bad at a recent interview I had at Google... all 5 interview rounds were almost entirely focused on one or two algorithm questions without any regard to any of the usual open-ended questions about past challenges, motivation, etc. I even had one interviewer start out asking about an interesting technical challenge I had, and basically cut me off after a minute or two with kind of a "ok thats great lets get on with the whiteboard now."