This book is intended to serve as a text-book for all the students who are preparing themselves in this subject of Mechanical Engineering for Diploma examinations in the States of Punjab. Haryana, Himachal Pradesh and Union territories of Delhi and Chandigarh. This book covers absolutely the full syllabus prepared by Curriculum Development Centre. T.T.T.I. Chandigarh. The language used in this book is simple and illustrative.The second edition of the book has been entirely revised and new topics have been added in the various chapters to cover the syllabi and questions asked in the examination papers of Boards of Technical Education of various states.