The thermal efficiency

Question

The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)

Options:

A . `r^(Y - 1)`

B . `1 -r^(Y - 1)`

C . `1 - (1/r)^(Y//Y - 1)`

D . `1 - (1/r)^(Y - 1//Y)`

Answer: Option D

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