1.

The efficiency of a heat engine working between the freezing point and boiling point of water is ………(a) 6.25% (b) 20% (c) 26.8% (d) 12.5%

Answer»

Correct answer is (c) 26.8%

Freezing point of water TL = 0°C = 273K 

Boiling point of water TH – 100°C = 373K

∴ Efficiency, η = 1 - \(\frac{T_L}{T_H} = 1 - \frac{273}{373}\) = 0.2861; n = 26.8%



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