NEET Sample Paper NEET Sample Test Paper-38

  • question_answer
    If the cold junction of a thermocouple is kept at  \[0{}^\circ C\] and the hot junction is kept at \[{{T}^{o}}C,\]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 :

    We know 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 \[0{}^\circ C\], hence T=0. Thus,\[{{T}_{i}}=2{{T}_{n}}\]or \[{{T}_{n}}=\frac{{{T}_{i}}}{2}\]


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