Railways Technical Ability Turbomachinery Question Bank Turbomachinery

  • question_answer Optimum pressure ratio for maximum specific output for ideal gas turbine plant operating at initial temperature of 300 K and maximum temperature of 1000 K is closer to:

    A) 4                                 

    B) 8

    C) 12                                

    D) 16

    Correct Answer: B

    Solution :

    Maximum possible pressure ratio, \[{{r}_{p}}={{\left( \frac{{{T}_{2}}}{{{T}_{1}}} \right)}^{\frac{\gamma }{\gamma -1}}}={{\left( \frac{1000}{300} \right)}^{3.5}}=67.62\] Pressure ratio for maximum output = \[\sqrt{{{r}_{p}}}\] \[=\sqrt{67.62}\,=8.22=8\]

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