KOTHARI, D. P. D. P. KOTHARI, Ph.D., is Director General, J B Group of Institutions, Yenkapally, Moinabad, Hyderabad-500075. Earlier, he was Professor at the Centre for Energy Studies, Indian Institute of Technology Delhi. He also served as Director-in-Charge, IIT Delhi (2005), Deputy Director (Administration), IIT Delhi (2003-06), Principal, National Institute of Technology Nagpur (1997–1998) and Head, Centre for Energy Studies, IIT Delhi (1997–1998). Dr. Kothari’s fields of specialization include optimal hydro-thermal scheduling, unit commitment, maintenance scheduling, energy conservation, and power quality and energy systems planning and modelling. A recipient of several national awards, Dr. Kothari who contributed extensively to the specialized areas, guided 28 Ph.D.s and 60 M.Tech.s, authored 20 books on Power Systems and published 625 research papers in various national and international journals. NAGRATH, I.J. Dr. I.J.NAGRATH, PH.D.is Professor of Electrical and Electronics Engineering and Deputy Director, Birla Institute of Technology and Science, Pilani. He has published several research papers in prestigious national and international journals and authored/co-authored a number of well-established books, including Basic Electrical Engineering, Modern Power System Analysis and Theory and Problems of Electrical Machines.