Every time you suggest a question, it will go through a series of automatic filters such as the repeated question or offensive question filter. If the question is not approved by these filters, it will be automatically rejected for the appropriate reason. If the question goes through these filters, it will be added to a list of questions where it will be rated by other users before it gets approved.
If your question gets rejected for no apparent reason, please get in touch with us so we can look into your situation.