This question can better be answered by the Musing owners/ admins.
However, what I feel is that there should not be any such limitation.
As long as someone is asking some quality question/ answers. He/She should ask as many as they want to clear their doubts.
Before asking questions following should be kept in mind.
Question should be relevant.
Avoid asking repeated question.
Question asked should be clear and properly described.
Following should be kept in mind while answering:
Answer given should be relevant to the question asked.
Given complete explanation of answer for better understanding.
Avoid coping others content. Otherwise you will be flagged.