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JCECE Engineering JCECE Engineering Solved Paper-2007

  • question_answer
    We consider a thermodynamic system. If \[\Delta U\] represents the increase in its internal energy and \[W\] the work done by the system, which of the following statements is true?

    A)  \[\Delta U=-W\] in an adiabatic process

    B)  \[\Delta U=W\] in an isothermal process

    C)   \[\Delta U=-W\] in an isothermal process

    D)   \[\Delta U=W\] in an adiabatic process

    Correct Answer: A

    Solution :

    An isothermal process is a constant temperature process. In this process,                     \[T=\]constant or\[AT=0\]. \[\therefore \]  \[\Delta U=n{{C}_{V}}\Delta T=0\] An adiabatic process is defined as one with no heat transfer into or out of a system. Therefore,                 \[Q=0\] From first law of thermodynamics                 \[W=-\Delta U\] or        \[\Delta U=-W\]


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