The efficiency of a Carnot engine working between 27°C and 127°C is

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η = 1 - T₂/T₁ = 1 - (300/400) = 1 - 0.75 = 0.25 = 25%. Wait, T₁ high temp 400 K, T₂ low 300 K, so η = 1 - 300/400 = 0.25 = 25%. Option A is 25%. Let's correct answer A. I'll set option A: 25%.

The efficiency of a Carnot engine working between 27°C and 127°C is MCQ with Answer and Explanation

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