Railways NTPC (Technical Ability) Thermodynamics Question Bank Thermodynamics

  • question_answer
    For air standard Brayton cycle, increase in the maximum temperature of the cycle, while keeping the pressure ratio the same, would result in:

    A) Increase in air standard efficiency

    B) Decrease in air standard efficiency

    C) No change in air standard efficiency         

    D) Increase in the efficiency but reduction in network

    Correct Answer: C

    Solution :

    \[\eta \,\,=\,\,1\,\,-\,\,\frac{1}{{{r}_{p}}^{{\left( \gamma \,-\,1 \right)}/{\gamma }\;}},\] \[{{r}_{p}}\,\,=\,\,\frac{{{p}_{2}}}{{{p}_{1}}}\] Efficiency of Brayton does not depend on maximum temperature


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