We are glad and excited to announce that the First Edition of this bookreceived an overwhelming response from the engineering student community,compelling us to release its Second Edition within a very short period of time.This thoroughly revised Second Edition has been updated with additionalmatter, many solved problems, including solutions to all University ExaminationProblems and Numerous Exercises for practice.Special care has been taken to maintain high degree of accuracy in the theoryand numericals throughout the book.