A) \[{{T}_{n}}=\text{ }275{}^\circ C\text{ }and\text{ }{{T}_{i}}=\text{ }570{}^\circ C\]
B) \[{{T}_{n}}=\text{ }275{}^\circ C\text{ }and\text{ }{{T}_{i}}=\text{ }560{}^\circ C\]
C) \[{{T}_{n}}=\text{ }285{}^\circ C\text{ }and\text{ }{{T}_{i}}=\text{ }560{}^\circ C\]
D) \[{{T}_{n}}=\text{ }295C\text{ }and\text{ }{{T}_{i}}=\text{ }580{}^\circ C\]
Correct Answer: C
Solution :
No change in neutral temperature when the temperature of cold junction is raised to \[10{{\,}^{o}}C\] \[{{T}_{n}}=\frac{{{T}_{i}}+{{T}_{c}}}{2}\] \[{{285}^{o}}=\frac{{{T}_{i}}+(0+10)}{2}\] \[285\times 2={{T}_{i}}+{{10}^{o}}\] \[570-10={{T}_{i}}\] \[{{T}_{i}}=560{{\,}^{o}}C\] So, the \[{{T}_{n}}=285{{\,}^{o}}C\]and \[{{T}_{i}}=560{{\,}^{o}}C\]
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