Aside from the open and closed questions, I would also recommend that my new instructor utilize "planted" questions. The instructor thinks of several open and closed ended questions prior to the start of class and secretly distributes these to a few students. When the instructor gives a verbal or visual cue, the student will then ask the question you have given them. This usually relates to your key objectives and helps wrap up that objective. It is also a technique to help keep students engaged and actively listening to the instructor.