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Engine machine that produces useful energy from the movement of any other form of energy. The term is usually restricted to internal combustion engines that burn fuel. These machines include the steam engine, diesel engine, jet engine and rocket engine.

Such engines are characterized by electrical motors, which ensure their strength, rather than directly modifying the physical or chemical composition of the material. Internal combustion engines are two main types: external combustion engine is fuel combustion, the chamber in which the movement is made. In the steam locomotive, for example, in case of fire box is separated from the cylinder. Internal combustion engine burns fuel and developing motion in the same place.

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