A) 80 K, 60 K
B) 100 K, 80 K
C) 60 K, 40 K
D) 40 K, 20 K
Correct Answer: D
Solution :
\[\eta =1-\frac{{{T}_{2}}}{{{T}_{1}}};\] for h to be max. ratio \[\frac{{{T}_{2}}}{{{T}_{1}}}\] should be min.
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