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A real engine operates at 75% of the efficiency of a Carnot engine operating between the same two temperature. This real engine has a power output of 100 W and discharge heat into the 27ºC low-temperature reservoir at a rate of 300 J/s. What is the temperature of the high-temperature reservoir? (A) 27ºC (B) 77ºC (C)127ºC (D) 177ºC
The correct option is (C) 127 ° C.The efficiency ε of a Carnot engine is defined as,
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