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Railways NTPC (Technical Ability) Engineering Mechanics and Strength of Materials Question Bank Engineering Mechanics

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    In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and the rotor blade exit angle is 30". For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the stator  will be:                                         

    A) \[640/\sqrt{3}\,\text{m/s}\]                     

    B) 640 m/s

    C) \[320/\sqrt{3}\,\text{m/s}\]                     

    D) \[160/\sqrt{3}\,\text{m/s}\]

    Correct Answer: C

    Solution :

    Steam, velocity at exit of stator \[=320\,\tan \,\,30{}^\circ \] \[=\frac{320}{\sqrt{3}}\,\,\text{m/s}\]


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