Mechanical Engineering is one of the major divisions within the profession and its principles are involved in the design, development and construction of nearly all of the physical devices and systems which technology has produced.Mechanical engineers are also concerned with the operations of all kinds of machinery, and the production of power. They must conceive research, design, develop, test, manufacture and sell equipment for these purposes. Mechanical engineering involves the design, development and construction of nearly all of the physical devices and systems which technology has produced. Typical examples include automobiles, aircrafts, turbines, robotics, agriculture machinery, etc. Mechanical engineers are also concerned with the operations of all kinds of machinery, and the production of power. They much conceive research, design, develop, manufacture, test and sell equipment for these purposes.