Looking for a recommendation of a book I can take out from the library at my University. I am looking for a book that has questions & answers (even or odd) to circuits involving transformers. I currently have a textbook with problems, but it has no answers. I find it rather pointless working through a problem when one cannot ensure they got it right. This is at an undergraduate level; in fact it is my first real course in power. Main topics I am looking for is single-phase transformers, and triple phase transformers. Thanks in advance!