This book has been written to meet the long felt demand of Electrical Engineering students preparing for Diploma, Degree U.P.S.C. Preliminary, Engineering Services, Competitive Tests and Viva-Voce Examinations and for those who are aspiring for bright jobs. The author will consider his efforts amply rewarded if the book serves the purpose of the students for whom it is meant. A comprehensive book for quick reference and objective type questions for all types of competitive examinations. This book is also useful for the recruitment test/interview by various public sector undertakings, GATE, UPSC and Civil Services, I.E.T.E., CPWD, IEE, Railways etc.