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10 September, 16:38

A gasoline 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.)

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  1. 10 September, 19:51
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    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)

    Answer: 17% (nearest integer)
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