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Question
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)
Options:
A .  r ɣ-1
B .  1 - r ɣ-1
C .  1 - (1/r) ɣ-1/ɣ
D .  1 - (1/r) ɣ/ɣ-1
Answer: Option C
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