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Which effect decreases energy output when a Carnot engine's isentropic compression exceeds design limits?

A)Decreased thermal reservoir temperature difference
B)Lower isothermal heat transfer efficiency
C)Increased irreversibility from frictional losses
D)Reduced working fluid phase change

💡 Explanation

Increased compression raises working fluid temperature, therefore increasing internal pressure and consequently frictional losses due to mechanical stresses, because the process deviates from ideal isentropic behavior, rather than just reservoir temperature differences causing inefficiency.

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