A understanding of the fundamentals of mechanical systems is a prerequistite for engineering studies. This book encapsulates thebasic concepts of varied fields of mechanical engineering, particularly thermodynamics, various energies, role of prime movers in power generation ( Steam boilers, Hydraulic turbines, pumps and IC engines) power transmission (belt and gear drives) and the theory behind the refrigeration and air conditioning. It also introduces the reader to the use of various machine tools, soldering, brazing, welding in manufacturing processes the fundamentals of engineering materials robotics and automation. The book builds on these topics from the first principles, amply supported by examples solved problems and illustrations. Key Features: Simple and Comprehensive introduction and step by step explanation. Solved numerical problems using different methods with the help of suitable hints and common equations to avoid confusion from various units. Illustrations and sketches that portray explicit two- dimensional views. Supplementary bits of information included as asides to kindle interest