About Book:

                  I sincerely thank our Chairman Shri. K.V.Thangkabalu, M1.1. 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. M. Venkatesh, Principal Thangavelu Engineering College and Dr. It. Subramaniyan, Principal TJ. 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 & ACCET, 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