Props to you for mentioning QN to show that you did some research and not just apply to CMU or any other program randomly.
That said, the answers sound a bit naive and it may show a lack of understanding of the current industry, job market condition, trend, etc.
Starting from risk analyst and then network your way into trading jobs is a very long shot at best. How many people you personally know that did that?
This is a very bland answer and doesn't show that you are genuinely interested or passionated about the field at all.
The first question is probably been asked too many times so a quick search would answer them. So is the second question. There is nothing specific about CMU that change the answer to it. It's just a very generic question.
There are just way too many information about CMU on this website for you to not know a lot about them already. Questions should be used to show that you did your HW and ask something different.
That's my take. At the very least, you get an interview so it's a 50/50 chance.