Hi Sue
I have two main questions (one theoretical, one empirical) although I've had a lot of comments over having two and had to fight to keep my corner. The first question (theoretical) has two sub-questions and the second question (empirical) has about five sub-questions.
I started out with 3 questions. I'm at transfer stage too (Upgrade in just over a week - eek) - and that has worked wonders for reshaping my focus. I did a pilot and that more or less helped me to stabilise my questions. In the first 12-18 months they were very fuzzy and I had to live with a lot of uncertainty.