I agree that good engineers can learn most tech fast, and that that is due to experience and not them being inherently smarter than others. If this is true though, how do you measure (non specific) experience? Maybe asking for 100 relatively easy but totally random knowledge crumbs? (some web, some unix, some networking, some functional programming, etc). It would be impossible to score high, but well rounded engineers could get more of them right. This might actually be a better approach than asking a few hard questions.