I don't think it entirely matters whether you are likely to use the exact phrase, building an understanding of the construction is helpful, for which I really appreciate other users explanations. I guess the most likely might be in a discussion of livestock and whether they are ready for market - "are they fat?" seems like a possible question.
Well, I haven't had much use for the sentence "Police is not a Politician" either up to now, but "Are they large?" seems a lot more useful and at least grammatically correct. It is a good example of adjective agreement.
For a realistic context, what about:
"My brothers eat a lot." - "Are they large?"