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Steam turbine is an excellent prime mover to convert heat energy of steam to mechanical energy of all heat engines and prime mover the steam turbine is nearest to the ideal and it is widely used in power plants and in all industries where power is needed for process. In power generation mostly steam turbine is used to drive an electrical generator rotary motion, it is particularly suited to be used to drive an electrical generator about 80% of all electricity generation in the world is by use of an steam turbine. Rotar is an heart of an steam turbine and it affects the efficiency of the steam turbine. In this project we have mainly discussed about the working process of a steam turbine is much higher than that of a steam engine.