About Book:

          I sincerely thank our Chairman Shri. K.V.ThangkaBalu, M.P. and our Chairperson Smt. Jayanthi ThangaBalu, Thangavelu Group of Colleges, without whose permission and Patronage. this book would not have been a success.

         I also thank Dr. Durai Arulneyam, Principal Thangavelu Engineering College and Dr. K. Raveendran, Principal T.J. Institute of Technology for lending their support to publish this book. Also I am immensely pleased to thank Dr. B. Jothiram formerly faculty in CEG, Chennai-25, GCE, Salem  & ACCENT, Karaikudi for his valuable suggestions towards further improvement of this edition.

       My thanks are due to my department colleagues for their valuable suggestions and help, at every stage.