What is the maximum theoretical efficiency possible for an engine operating between 100$^{\circ}$C and 400$^{\circ}$C?
A) 25%.
B) 45%.
C) 55%.
D) 75%.

Question

Quizplus · Accepted Answer

The maximum theoretical efficiency of a heat engine is given by the Carnot efficiency: $ \eta = 1 - \frac{T_c}{T_h} $, where $ T_c $ and $ T_h $ are the absolute temperatures (in Kelvin) of the cold and hot reservoirs, respectively. Converting the given temperatures to Kelvin: $ T_c = 100 + 273 = 373 \, K $ and $ T_h = 400 + 273 = 673 \, K $. Thus, $ \eta = 1 - \frac{373}{673} \approx 0.45 $ or 45%.

What Is the Maximum Theoretical Efficiency Possible for an Engine ∘^{\circ}∘

What Is the Maximum Theoretical Efficiency Possible for an Engine $^{\circ}$