A) \[\frac{\eta }{2}\]
B) \[\eta \]
C) \[2\eta \]
D) \[3\eta \]
Correct Answer: B
Solution :
In first case \[{{\eta }_{1}}=\frac{{{T}_{1}}-{{T}_{2}}}{{{T}_{1}}}\] In second case \[{{\eta }_{2}}=\frac{2{{T}_{1}}-2{{T}_{2}}}{2{{T}_{1}}}\]\[=\frac{{{T}_{1}}-{{T}_{2}}}{{{T}_{1}}}=\eta \]
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