Should a student keep asking questions to a faculty even if the faculty is unsure of the answer? I am taking an advance course in Computer Science so the class size is pretty limited (8 to be exact). The faculty is very senior and well respected in the field. For past few lectures, I have been asking questions that make the faculty a little uncomfortable which I can guess from the way the answers are given (I am also on a psychology class :-) )

For example, to understand a concept, I say "why X has been used ?". He tries his best to answer "because of A,B,C reasons". During this explanation, occasionally I can sense high level of uncomfort in him and the answers are ambiguous. So, now I have doubt that "if X, then why A ? " and so on. Should one continue with these kind of questions when you know that the faculty won't be able to answer the questions perfectly or isn't comfortable enough to satisfy your inquisitiveness. I do not doubt his competence at all and respect him very much. But how does a faculty feel in this kind of continuous poking (if it is so) or should one resort to personal interaction so that he may feel more comfortable ? 

Does that hold negatively for the student that student is trying to humiliate the faculty ?

Note: Questions are not non-sense but are somewhat basic and supported by logic.
You're studying psychology. That doesn't make you telepathic.

There's a wide variety of possible reasons for what's going on:


you are mistaken, your lecturer is not uncomfortable. Crazy, I know, but you just might be wrong.
your lecturer has indigestion, or piles, or tight shoes
your questions indicate you're missing basic knowledge
the questions take the group away from the core material that the lecturer has to get through, and answering them will slow the teaching down
your lecturer doesn't know the answer, and can't bring themselves to say as much, and doesn't have the nous to turn it around and ask you or the rest of the class to find the answer. That's quite a failing in an academic, to be unable to say "I don't know".


Note that repeatedly asking "why A?" "So why B?" "So why C? ..." is something that toddlers do, it's often just time-wasting and attention-seeking and is likely to annoy a lot of people; even if those aren't your motives, be aware that it could come across as that. So instead of just asking questions, look for some answers yourself. You are doing a higher degree, after all, so you should be looking for answers yourself, as well as seeking help from staff and other students.