The asker of 'dumb questions'

I study a somewhat technical tech masters degree that is open to both technical and non-technical students. A large chunk of our grade is in-class participation and most teachers have made a point that not participating will affect grades. 

The technical students (ie those who studied a science/comp science undergraduate) often ask very advanced questions and make remarks that are completely out of my remit. Most of the non-technical people don’t ask a lot of questions, but the ones that do ask some clever ones (some are very up-to-date with e.g. technological developments in some sectors and link that to the class content).   

I am quite worried about the class participation grades and force myself to ask at least 1 question per class. But I feel quite stupid because I've asked objectively dumb questions (e.g. with very obvious answers or based on misunderstandings of concepts), and I often lack the terminology to formulate the question correctly. I’ve even had situations when the teacher could not understand what I was asking and I felt mortified. There are also some students in the class making fun about students who ‘ask dumb questions’ and even though no-one has targeted me I still feel as though I’ll be in that category. 

I’m just starting to dread raising my hand because I’ve felt so stupid each time, but equally I don’t want my grades to suffer just because I feel self-conscious. Not sure what the point of this post is beyond, well, taking it off my chest. If anyone has any encouraging words or advice I'd appreciate that too.