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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2004

  • question_answer
    An ice box made of Styrofoam (Thermal conductivity\[=0.01\,J{{m}^{-1}}{{s}^{-1}}{{K}^{-1}})\]is used to keep liquids cool. It has a total wall area including lid of\[0.8\text{ }{{m}^{2}}\]and wall thickness of 2.0 cm. A bottle of water is placed in the box and filled with ice. If the outside temperature is\[30{}^\circ C\] the rate of flow of heat into the box is : (in \[J-{{s}^{-1}}\]):

    A)  16                                         

    B)  14

    C)  12                         

    D)         10

    E)  8

    Correct Answer: C

    Solution :

    \[H=\frac{Q}{t}=\frac{KA({{\theta }_{1}}-{{\theta }_{2}})}{d}\] \[=\frac{0.01\times 0.8(30{}^\circ -0{}^\circ )}{2\times {{10}^{-2}}}\] \[=12\,J-{{s}^{-1}}\]


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