Question: Engineers testing the efficiency of an electric generator gradually vary the temperature of the hot steam used to power it while leaving the temperature of

Engineers testing the efficiency of an electric generator gradually vary the temperature of the hot steam used to power it while leaving the temperature of the cooling water at a constant 20°C.
They find that the generator’s efficiency increases at a rate of 3.5 × 10^-4 K^-1 at steam temperatures near 300°C. What is the ratio of the generator’s efficiency to the efficiency of a Carnot engine?

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