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

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

(A) r^{γ – 1}

(B) 1 – r^{γ – 1}

(C) 1 – (1/r) γ/γ – 1

(D) 1 – (1/r)γ – 1/ γ              (Ans)