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Efficiency of a Carnot engine between two given temperatures

This type of question, asked 3 times: 26 Jun 2022, 25 Jul 2022, 12 Apr 2023. All 3 questions below, oldest first.

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  1. Question 1

    26 Jun 2022

    7
    The efficiency of a Carnot's engine, working between steam point and ice point, will be:

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  2. Question 2

    25 Jul 2022

    105
    Let η1\eta_{1} is the efficiency of an engine at T1=447∘CT_{1}=447^{\circ}C and T2=147∘CT_{2}=147^{\circ}C while η2\eta_{2} is the efficiency at T1=947∘CT_{1}=947^{\circ}C and T2=47∘CT_{2}=47^{\circ}C. The ratio η1η2\frac{\eta_{1}}{\eta_{2}} will be:

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  3. Question 3

    12 Apr 2023

    12
    An engine operating between the boiling and freezing points of water will have (A) efficiency more than 27%27\% (B) efficiency less than the efficiency a Carnot engine operating between the same two temperatures. (C) efficiency equal to 27%27\% (D) efficiency less than 27%27\%

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