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Manipal Engineering Manipal Engineering Solved Paper-2014

  • question_answer
    Two litre of water at initial temperature of 27°C is heated by a heater of power 1 kW. If the lid of kettle is opened, then heat is lost at the constant rate of 160 J/s. Find, the time required to raise the temperature of water to 77°C with the lid open (specific heat of water 4.2 kJ/kg)

    A)  5 min 40 s                          

    B) 14 min 20s

    C) 8 min 20 s                           

    D) 16 min 10s

    Correct Answer: C

    Solution :

    Rate of heat gain = 1000 -160 = 840 J/s \[C{{F}^{+}}<C{{F}^{-}}<CF\]Required time \[C{{F}^{-}}<CF<C{{F}^{+}}\] \[CF<C{{F}^{-}}<C{{F}^{+}}\]


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