Agasoline engine operates at a temperature of 270°c and exhausts at 180°c. calculate the maximum efficiency of this engine. (note that the celsius scale is used.)

Given:
Th = 270 °C = 270+273 = 543 K, hot temperature
Tc = 180 °C = 180+273 = 453 K, cold temperature

According to the Carnot theorem, the maximum efficiency achievable by a heat engine between a hot and cold temperature is
η = 1 - Tc/Th
   = 1 - 453/543
   = 0.166 = 17% (approx)

 17%  (nearest integer)

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