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CMC Medical CMC-Medical VELLORE Solved Paper-2014

  • question_answer
    The thermo emf of a thermocouple is given by \[E=aT+b{{T}^{2}},\] where \[\frac{a}{b}=-\,200{}^\circ C.\] If the cold function is kept at \[30{}^\circ C,\] then the inversion temperature is (E in volt, T in centigrade)

    A)  103 K                   

    B)  143 K

    C)  333 K                   

    D)  443 K

    Correct Answer: D

    Solution :

                    At temperature of inversion \[E=0\] \[E=aT+b{{T}^{2}}\] \[0=aT+b{{T}^{2}}\] \[T=-\frac{a}{b}=200{}^\circ C\] \[T=200-30=170{}^\circ C\] \[T=273+170=443K\]


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