I have not seen a lot out there. Graffeo"s "The Elec. Eng's Gude to Passing the PE" does a good job. I have not done this myself but a good idea may be to do a Google search and combine info from various articles. I did that for VFD's, among other things, and found that be very helpful for April's exam. In fact, that strategy proved to be helpful for several other topics too.