Waly whacko claims to have invented a heat engine that will, Ask an Expert

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Waly Whacko claims to have invented a heat engine that will revolutionize industry. It runs between a hot source at 300oC and a cold sink at 25oC. He claims that his engine is 92%

(a) What error did he made in his choice of temperature scale? And

(b) What is the actual maximum efficiency of his engine?

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