A) \[2{{T}_{1}},2{{T}_{2}}\]
B) \[2{{T}_{1}},\frac{{{T}_{2}}}{2}\]
C) \[{{T}_{1}}+5,\,{{T}_{2}}-5\]
D) \[{{T}_{1}}+10,\,{{T}_{2}}-10\]
Correct Answer: A
Solution :
Efficiency of Carnot's heat engine, \[\eta =1-\frac{{{T}_{2}}}{{{T}_{1}}}\]. Efficiency remains same when both \[{{T}_{1}}\] and \[{{T}_{2}}\]are increased by same factor.
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