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A scientist claims to have developed a heat engine working between 27ºC and 727ºC with efficiency x. Which of the following values of x will make his claim right?

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70%

75%

80%

85%

answer is A.

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Detailed Solution

$η_{max} = 1 - \frac{T_{2}}{T_{1}} = 1 - \frac{300}{1000} = 70 %$

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