A) \[{{127}^{o}}C\]
B) \[{{227}^{o}}C\]
C) \[{{327}^{o}}C\]
D) \[{{673}^{o}}C\]
Correct Answer: B
Solution :
Given:\[{{T}_{2}}=77+273=350K\] Efficiency\[\eta =\left( 1-\frac{{{T}_{2}}}{{{T}_{1}}} \right)\times 100\] \[30=\left( 1-\frac{350}{{{T}_{1}}} \right)100\] \[1-\frac{350}{{{T}_{1}}}=\frac{3}{10}\] \[\frac{350}{{{T}_{1}}}=\frac{7}{10}\] \[{{T}_{1}}=\frac{350\times 10}{7}=500K\] \[=500-273={{227}^{o}}C\]
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