Are there any limitation to the number of posts for a certain period? Suppose, I want to ask more than six questions within one hour. Does this act go against the rules of this website? What is the highest number of questions which can be asked within one hour?
We do have a limit, but it's based on a number of days not hours: six questions per day, and fifty per month. So you would be allowed to submit six questions in an hour, but that would use up your allowance for the day.
That said, six questions an hour should be infeasible, unless they are of poor quality. Take a look at an answer about question quality and research. Even six questions a day should be pushing it.