UPSC Civil Services Preliminary During the period 1993 to 2010 have resulted in large sets of objective type questions in various fields of engineering. It is observed that a very significant proportion of these questions are regularly appearing in ESE, GATE, PSU’s and Competitive examination various of state services commissioned electricity boards of the country. These questions are thus very much useful to electrical and communication students. The subjects contains in this book: Circuits-Theory, EM Theory, Control Systems, Measurements and Instrumentation, Analog Electronics, Digital Electronics, Microprocessors, Communication Systems, Signals and Systems, Energy Conversion, Power Systems, Power Electronics and Electric Drives, Electrical Materials. With a view of assisting candidates appearing for examinations of the above type, ACE academy takes a pride in bringing out a complete set of solutions for the civil services preliminary questions. Most of these questions are conceptual and of high standard. Detailed solutions explaining how the answers are arrived at is presented in addition to answer keys . These will be found useful not only in answering objective type questions but also questions of the conventional type. The solutions are prepared with Utmost care. Inspite of this, If there are errors of any type, we will be grateful to be informed of the same to aceenggpublications@gmail.com Best wishes to all those who want to go through the following pages.