A) 900 K
B) 600 K
C) 700 K
D) 800 K
E) 550 K
Correct Answer: B
Solution :
Cannot efficiency relation \[\eta =\frac{{{T}_{1}}-{{T}_{2}}}{{{T}_{1}}}\] Case I \[\frac{{{T}_{1}}-{{T}_{2}}}{{{T}_{1}}}=0.4\] \[{{T}_{1}}-{{T}_{2}}=0.4{{T}_{1}}\] \[{{T}_{2}}=0.6{{T}_{1}}\] Case II \[\frac{T_{1}^{}-{{T}_{2}}}{T_{1}^{}}=0.5\] \[T_{1}^{}=\frac{0.6}{0.5}{{T}_{1}}=600\,K\]
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