The reasons for why questions were down-voted, and why they were closed are hardly related. They don't trigger each other.
However, there might a several reasons explaining the correlation between the down-votes a question may get, and why it may get closed.
A question is not close-voted just because of the bad quality. There's no such criteria for close votes. However, if the question is still unclear after editing, then it may get down-votes, and be closed as it's "not a real question" or "too localized", etc.