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Railways NTPC (Technical Ability) Thermodynamics Question Bank Thermodynamics

  • question_answer
           Which one of the following expressions for Tds is true for a simple compressible substance?             (Notations have the usual meaning)

    A) \[dh-vdp\]                     

    B) \[dh+vdp\]

    C) \[dh-pdv\]                     

    D) \[dh+pdv\]

    Correct Answer: A

    Solution :

    \[h=u+pv\] \[dh=d\,\left( u+pv \right)=\left( du+p.dv \right)+v.dp\] \[=T.ds+vdp\] \[T.\,s=dh-v.dp\]


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