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  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-15

  • question_answer
    A carnot refrigerator A works between \[-10{}^\circ C\] and\[27{}^\circ C\], while refrigerator B works between\[-27{}^\circ C\] and\[17{}^\circ C\], both removing heat equal to 2000 J from the freezer. Which of the two is better refrigerator?

    A)  A                                           

    B)  B

    C)  both of them have  same performance

    D)  cannot be said

    Correct Answer: A

    Solution :

    Coefficient of performance \[=\frac{{{T}_{cold}}}{{{T}_{hot}}-{{T}_{cold}}}\] \[{{\beta }_{2}}=\frac{246}{44}\]\[{{\beta }_{1}}=\frac{263}{37}\]\[{{\beta }_{1}}>{{\beta }_{2}}\]


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