NEET AIPMT SOLVED PAPER SCREENING 2007

  • question_answer
                    If the cold junction of a thermo-couple is kept at \[{{0}^{\text{o}}}C\] and the hot junction is kept at \[{{T}^{\text{o}}}C,\] then the relation between neutral temperature \[({{T}_{n}})\] and temperature of inversion \[({{T}_{i}})\] is:           

    A)                                             \[{{T}_{n}}=\frac{{{T}_{i}}}{2}\]

    B)                  \[{{T}_{n}}=2{{T}_{i}}\]

    C)                  \[{{T}_{n}}={{T}_{i}}-T\]              

    D)                  \[{{T}_{n}}={{T}_{i}}+T\]

    Correct Answer: A

    Solution :

                    It is found that temperature of inversion \[({{T}_{i}})\] is as much above the neutral temperature \[({{T}_{n}})\] as neutral temperature is above the temperature of the cold junction (T), i. e.,                 \[{{T}_{i}}-{{T}_{n}}={{T}_{n}}-T\]                 or            \[{{T}_{i}}=2{{T}_{n}}-T\]                 But, here the cold junction is kept at \[{{0}^{\text{o}}}C,\] hence                 T = 0. Thus,     \[{{T}_{i}}=2{{T}_{n}}\]                 \[or{{T}_{n}}=\frac{{{T}_{i}}}{2}\]


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