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The ideal Brayton cycle thermal efficiency depends on

  • A.The turbine entry temperature only
  • B.The mass flow rate
  • C.The heat added per unit mass
  • D.The pressure ratio and the specific heat ratio only

Answer: D

The relation is \( 1 - r_p^{(1-\gamma)/\gamma} \), so raising the pressure ratio always improves the ideal efficiency. Turbine entry temperature does not appear at all, although it governs the specific work and dominates the real cycle.

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