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Railways NTPC (Technical Ability) Thermodynamics Question Bank Thermodynamics

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    A battery is used to light a bulb, run a fan and heat an electric iron in case of a power failure. If each of the above systems has 100 W rating and is run for 15 minutes, what are the work done (W) and heat transferred (Q) by the battery'?

    A) W = 90 kJ and Q = 90 kJ

    B) W = 180 kJ and Q = 0

    C) W = 270 kJ and Q = 0

    D) W = 90 kJ and Q = 180 kJ

    Correct Answer: A

    Solution :

    \[W=\frac{100\times 15\times 60}{{{10}^{3}}}=90\,\,kJ\] Q = W = 90 kJ


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