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

  • question_answer
    The work output from a reaction turbine stage is 280 kW per kg/s of steam. If the nozzle efficiency is 0.92 and rotor efficiency is 0.90, the isentropic static enthalpy drop will be:

    A) 352 kW            

    B) 347 kW

    C) 338 kW            

    D) 332 kW

    Correct Answer: C

    Solution :

    \[{{(\Delta h)}_{isen}}=\frac{w}{{{\eta }_{n}}\times {{\eta }_{r}}}=\frac{280}{0.92\times 0.90}=338\,\,kW\]


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