We are glad and excited to announce that the Fourth Edition of this book received an overwhelming response from the engineering student community, compelling us to release its Fifth Edition within a very short period of time. This thoroughly revised Fifth Edition (Enlarged Size) has been updated with additional matter, many solved problems, including solutions to all University Examination Problems, Numerous Exercises for Practice and University Question Papers upto December 2017. Special care has been taken to maintain high degree of accuracy in the theory and numericals throughout the book.