Recently there have been some questions which seem to have been posted intended as quizzes for users here rather than as legitimate questions. This isn't something I can prove, but given the nature and timing of the questions it seems like the answers were actually known to the OP at the time. Moreover, the questions were of the type that were probably not interesting to anyone else, e.g. identification style questions or extremely trivial facts.
I know that it's fine to ask questions that you already know the answer to, though in such cases it's usually good to write your own answer. However, is it still encouraged if the question is not likely to be interesting or useful to anyone else? Put another way, is it appropriate to downvote and/or vote to close questions where the OP clearly already knows the answer and is only posting to test us? It seems to me that all that kind of question does is inflate rep scores and fill our site with random questions that aren't really interesting to anyone.
As a note, even if it is acceptable to take negative actions against such posts, it should probably only be done once one is certain that the question fits this description.