An axial compressor that generates a stagnation pressure ratio of 4.0 , operates with inlet and exit stagnation temperatures of $300 \mathrm{~K}$ and $480 \mathrm{~K}$, respectively. If the ratio of specific heats $(\gamma)$ is $1.4,$ the isentropic efficiency of the compressor is

(A) 0.94

(B) 0.81

(C) 0.72

(D) 0.63

An axial compressor that generates a stagnation pressure ratio of 4.0 , operates with inlet and exit stagnation temperatures of $300 \mathrm{~K}$ and $480 \mathrm{~K}$, respectively. If the ratio of specific heats $(\gamma)$ is $1.4,$ the isentropic efficiency of the compressor is

(A) 0.94

(B) 0.81

(C) 0.72

(D) 0.63

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