What questions do you ask when you go to a job fair or interview about electrical work?

If you are a student, employers generally don't ask anything. Generally, employers know that college students are not rich in gold and can't learn anything at school. When recruiting, you have to show your eagerness to work in the recruiting unit.

He recruits students for training, and of course he wants to go to their company.

Some employers may ask some questions to test their study in the university, but now enterprises that distinguish between learning and not learning generally look at your CET-4 and CET-6.

If he asks about your professional knowledge, it is nothing more than some knowledge of analog-to-digital electricity, circuits and single-chip computers.

Say more, even if you can't answer, just go around.