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

  • question_answer
    For a steam jet angle of \[30{}^\circ \] (from the tangential direction) at the entrance, what is the maximum blade efficiency (approximate) of a Parson's turbine?

    A) 0.85                             

    B) 0.49

    C) 0.4                               

    D) 0.3

    Correct Answer: B

    Solution :

    \[{{\alpha }_{1}}=30{}^\circ ,\] \[{{(\eta b)}_{\max }}=\frac{2{{\cos }^{2}}{{\alpha }_{1}}}{1+{{\cos }^{2}}{{\alpha }_{1}}}\] \[=\frac{2{{\cos }^{2}}30{}^\circ }{1+{{\cos }^{2}}30{}^\circ }\] = 0.857


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