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Railways NTPC (Technical Ability) Thermodynamics Question Bank Thermodynamics

  • question_answer
    During a process with heat and work interactions, the internal energy of a system increases by 30 kJ. The amounts of heat and work interactions are respectively:

    A) \[-\,\,50\]kJ and \[-\,\,80\]kJ         

    B) \[-\,\,50\]kJ and 80 kJ

    C) 50 kJ and 80 kJ

    D) 50 kJ and \[-\,\,80\]kJ

    Correct Answer: A

    Solution :

    \[\delta Q=\delta W+dU\] \[dU=\delta Q-\delta W=30\] \[dU=-\,\,50+80=30\,\,kJ\]


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