After having worked in the filed of industrial compressors, pumps, material handling equipment, dynamometer field and software industry I decided to write this book which will help the people working in the automotive industry, engine and vehicle testing, people working in the dynamometer and instrumentation industry and electrical motor industry. The book will be of interest to the studenrs of mechanical and automobile engineering. The book will be of great value to the incumbents entering in the automotive and dynamometer fields.