A) 2.1 kJ/K and 70%
B) \[-\,\,0.9\] kJ/K and 25%
C) \[+\,\,0.9\] kJ/K and 70%
D) \[-\,\,2.1\] kJ/K and 50%
Correct Answer: B
Solution :
\[\oint{\frac{d\,Q}{T}}=\frac{{{Q}_{1}}}{{{T}_{1}}}-\frac{{{Q}_{2}}}{{{T}_{2}}}=\frac{600}{1000}-\frac{450}{300}=-\,\,0.9\,\text{kJ/K}\] \[\eta =1-\frac{{{Q}_{2}}}{{{Q}_{1}}}=1-\frac{450}{600}=0.25\,\,or\,\,25%\]You need to login to perform this action.
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