Steam turbine convert a part of the energy of the steam evidenced by high temperature and pressure into mechanical power-in turn electrical power. The steam from the boiler is expanded in a nozzle, resulting in the emission of high velocity jet. This jet of steam impinges on the moving vanes or blades, mounted on a shaft. Here it undergoes a change of direction of motion which gives rise to a change in momentum and therefore a force. The motive power in a steam turbine is obtained by the rate of change.

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