It's Tektro V-brake, 700x35c wheel.
What I wanted to know is, if I undo the brake, could the brake pads become mis-aligned when putting the wheel back?--will I need to readjust the brake or it will be the same as original? (Obviously I have never tried yet.)
I suspect that you're trying too hard.
Look at where the cable attaches to the wheel brake arches. See that little metal noodle thing. Squeeze your brake pads together against the wheel rim and, now that the cable feels loose, pull that metal noodle sideways. It'll come out of the little metal stirrup that holds it. Now the brakes will open wider and allow you to remove the wheel easily.
Whe reeplacing the wheel, simply reverse the process and the brakes will line up exactly as they were before.