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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. 

It all depends if you have enough Resource Credits. If you have enough for 5 comments then it then that is all you can do. However there is no limit by musing.io as such and are allowed to ask and answer as many questions as possible.

I have been fortunate enough to only be limited last week when the HF20 was happening and the patch was put in place. At that point I was only allowed to do roughly 28 questions and answers per day and now since then I have had no issues.

Well there isn't any limit placed on the number of questions you can ask or answer on musing per say, but the amount of RCs that you have plays a vital role in determining just how many times you can comment on steemit or any steem related Dapp.

If you have up to 100sp then you'll be able to answer and ask up to at least 100 questions before your RC has finished and that's more than enough if you ask me, besides, RCs take about 4 days to fully recharge so you'll be fine even if they finish.

I've probably answered far more than 100 questions on musing and I haven't had any issues whatsoever so I'm pretty sure there isn't any limit. If you really want to be sure then you can go to the musing blog page on steemit(steemit.com/@musing), There you'll find a link to their discord server. You can join and ask the admins there yourself, they're quite friendly and will attend to you quickly.

The only limit is based on how many RC you have available.

I will copy my usual RC post below to explain (boy this is getting a lot of airtime)

 Your steempower affects how many RC you have and that is what controls how often you can post and vote, etc.

What are RC and where did they come from? 

RC = Resource Credit. RC is an estimation of cost, which includes:  

- CPU (mega)cycles

- State memory

- History size

It is a feature implemented in HF20 to replace the old bandwidth system.

Every action taken on the blockchain has a "cost" associated with it to perform. The larger, the more complex the action, the more space it requires on the blockchain, etc, the larger the cost. In the past that was monitored by the bandwidth number.

As each of us performed actions our available bandwidth decreased. However it was determined that bandwidth was not an accurate measure of the cost of these operations and also was not scaleable in the future.  A new solution was devised.... enter Resource Credits.

This is supposed to be a more true and accurate calculation  of what resources are needed to perform each action. The longer your post/comment, the more pictures included, etc the more storage it takes on the blockchain, the higher the "cost" to the user.It recharges over a 5 day so you will always go from 0% RC to 100% if you do nothing for 5 days. Personally I just won't use more then 20% or so a day and that way I won't have to worry about running out.

When HF20 was first implemented there were MANY issues with resource credits. There was a bug where initially any action you had taken at all since you first started here was counted against your RC and so most people had a HUGE negative debt and were unable to post, comment, upvote, or even power up since they had no RC to do those actions.

Patches have been implemented over the last few week to correct most of the issues found during the initial launch. There was a patch last week that increased the available resource pool for each block by a factor of 10. This had the impact of allowing most users to regain most of their RC right away as now suddenly supply outweighed demand and costs of operations were essentially lowered.

Another stated reason for the implementation of RC was to combat the number of spam bots out there. These bots were using an unfairly high amount of resources on the old system and not being charged directly for it. Under RC each account must have enough resource credits to pay for its own actions.It is hopeful that this will reduce (not eliminate) the amount  of spam comment bots plaguing the system.

RC is also a learning system that will attempt to find a balance. This means costs of operations will continually be changing. This allows flexibility and scalability moving forward when such features as communities and SMT's (Smart Media Tokens) are implemented in the future.

So overall RC was a necessary and needed upgrade to Steem for future growth and scalability but I do not think in any way its implementation can be considered smooth or uneventful. New users or those with low SP (and therefore low RC) will need to change their habits and be more conscious of how they spend their resource credits. You can get a general estimate of how many actions you can undertake by visiting www.beempy.com/power/@yourusername. You will be shown a page similar to:

From this information you can a more accurate sense of how many comments you can make, how much each will cost, how long it will take to recharge and other items. Remember it will take 5 days to recharge from 0 to 100%.