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An engine is a device that converts chemical energy in the fuel to mechanical and heat energy. This mechanical energy is used to drive a crank shaft which is used to power the wheels of an automobile.

The crack shaft is connected to a gear-box which changes the speed and torque of the drive shaft. A lower gear (low speed and high torque) is used for acceleration from halt and a higher gear (high speed and low torque) is used for cruising.

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