You might well feel measurable reactions to questions in the course of a polygraph examination, but not necessarily. It's standard procedure for polygraphers to interrogate when the charts are scored as "deception indicated." So the absence of a post-test interrogation is generally speaking a good (but not absolute) indication that one has passed, or that the result was at worst inconclusive.

I have a quick question I just took a polygraph. The polygrapher spilled his BS about it being 95-98% accurate and that the machine would measure my adrenal gland reaction before I had time to have a thought in my head.

Would I be able to feel a reaction if I had any? I was not nervous because I did not care about this test really but I am curious because I felt little if anything. Also would the polygrapher have told me if I failed or passed? (I was not interrogated on questions asked if I wanted to get anything off my chest) and there really wasnt even a post test interview.