The book is now revised & enlarged by two senior professors, who have added new chapters and revised the styling & presentation of the material contents, to suit the book to newer requirements of Engineering curriculum. Question bank and MCQ's are added at the end of Chapters for self-evaluation of the subject matter. Salient Features - New improved styling of contents. - Question bank, MCQ's & Essay type questions provided. - New chapter added on conducting & insulating materials. - Information about present status of Materials is provided.