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Hi my name is sumit kumar .]
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Engine

What is engine?

         
Engine is a machine which working is to converts energy into mechanical energy. An engine may converts energy from any of sources, including fuels, steam, and air or water under pressure to mechanical energy

Dessel engines

petrol engine

Here is a model of an petrol engine

Petrol engines use the electric energy of burning petrol to push pistons in the cylinders. The motion of the pistons is converted into rotary (circular) motion, which turns the wheels of a car or other automobiles.