Being in a technical school I use the question the question technique on a daily basis. I feel that it is important to have the student come up with the right answer by guiding them with leading questions. Kind of a follow the leader excersise. When the student askes a question in the lab I answer by asking a simple question that has direct relavance to what was asked; and lead them to the right answer. One tip is that if they get stuck help them out to keep it moving along. A student feels pride when they realize they knew the answer, they just needed help bringing it to the surface.