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A machine ( device) that uses chemical, nuclear, solar, thermal, electrical or any other energy to develop mechanical power is known as an engine. In other words, it is a generator of generator of mechanical power. In accordance with the kind ofenergy used, they are called chemical, nuclear, solar, thermal and electrical engines. According to their purpose engines are divided into stationary and transportation ones .The former are incorporated in power plant installed at power stations, works orfactories and operate on a fixed base. The latter are mounted on transportation facilities, e.g., flying vehicles, automobiles, tractors, river and sea vessels, and serve to propel them in air, space, on ground, on water and under it. Transportation engines, in their turn, are subdivided, according to their application, into space vehicle, airplane, automobile, vessel, locomotive engines, etc. The mechanical energy generated by a transportation engine is used to set in motion the facility on which