No its a symptom of it. Friction is the cause.

Actually there are many reasons for whine, it is a result of various things friction not really being the main player. and is different blower to blower.

for instance the blower on my car is very loud, later versions are quiter due to gear and lobe design (angle, not friction related)

sounds better when the whine imo. but some sound like they are wailing (maloo)

http://www.youtube.com/watch?v=KWb6Ff5HzDs
Sprintex S5-210 supercharger kit for the 86