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Railways NTPC (Technical Ability) Power Plant Engineering Question Bank Power Plant Engineering

  • question_answer
    If in an impulse turbine designed for free vortex flow, the tangential velocity of steam at the root radius of 250 mm is 430 m/s and the Made height is 100 mm, then the tangential velocity of steam at the tip will be:

    A) 602 m/s            

    B) 504 m/s

    C) 409 m/s            

    D) 307 m/s

    Correct Answer: D

    Solution :

    \[{{v}_{1}}{{r}_{1}}={{v}_{2}}{{r}_{2}}\] \[{{v}_{2}}=\frac{430\times 250}{350}=307\,\text{m/s}\]


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