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CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2004

  • question_answer
    An immersion heater with electrical resistance\[7\,\Omega \]. is immersed in 0.1 kg of water at\[20{}^\circ C\]for 3 min. If the flow of current is 4 A, what is the final temperature of the water in ideal conditions? (Specific heat capacity of water\[=4.2\times {{10}^{3}}J\,k{{g}^{-1}}{{K}^{-1}}\]):

    A)  \[28{}^\circ C\]

    B)                                         \[48{}^\circ C\]

    C)  \[52{}^\circ C\]                

    D)         \[68{}^\circ C\]

    E)  \[72{}^\circ C\]

    Correct Answer: D

    Solution :

    \[{{i}^{2}}Rt=ms\Delta t\] \[\Rightarrow \]\[{{(4)}^{2}}\times 7\times 3\times 60=0.1\times 4.2\times {{10}^{3}}\]                                                 \[\times [T-(20{}^\circ +273)]\]                 \[T=341K=68{}^\circ C\]


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