The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)
A. $${{\text{r}}^{\gamma - 1}}$$
B. $$1 - {{\text{r}}^{\gamma - 1}}$$
C. $$1 - {\left( {\frac{1}{{\text{r}}}} \right)^{\frac{\gamma }{{\gamma - 1}}}}$$
D. $$1 - {\left( {\frac{1}{{\text{r}}}} \right)^{\frac{{\gamma - 1}}{\gamma }}}$$
Answer: Option D
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