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Which outcome occurs when isentropic efficiency decreases in a gas turbine?

A)Increased fuel consumption efficiency
B)Decreased turbine output temperature
C)Increased heat rejection to cooling
D)Decreased compressor pressure ratio

💡 Explanation

Increased heat rejection to cooling water occurs, because lower isentropic efficiency means more irreversible processes within the turbine. This increases the exhaust enthalpy; therefore, more heat is rejected to the cooling system, rather than converted to effective work.

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