A) \[-25{}^\circ C\]
B) \[25{}^\circ C\]
C) \[-33{}^\circ C\]
D) \[33{}^\circ C\]
Correct Answer: C
Solution :
Efficiency \[\eta =1-\frac{{{T}_{2}}}{{{T}_{1}}}=\frac{{{T}_{1}}-{{T}_{2}}}{{{T}_{1}}}\] \[\frac{25}{100}=\frac{{{T}_{1}}-({{T}_{1}}-80)}{{{T}_{1}}}\] \[\frac{1}{4}=\frac{80}{{{T}_{1}}}\] \[{{T}_{1}}=320\,\,K\] \[{{T}_{1}}=320-273={{47}^{o}}C\] The temperature of the low temperature reservair = 47 - 80 \[=-{{33}^{o}}C\]
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