A) \[{{T}_{1}}\] and \[{{T}_{2}}\], should be high
B) \[{{T}_{1}}\] and \[{{T}_{2}}\] should be low
C) \[{{T}_{1}}\] should be low and \[{{T}_{2}}\] should be high
D) \[{{T}_{1}}\] should be high and \[{{T}_{2}}\] should be low
Correct Answer: D
Solution :
[d] \[\eta =1-\frac{{{T}_{2}}}{{{T}_{1}}}\]So for \[\eta \]be high \[{{T}_{1}}\] must be high and \[{{T}_{2}}\] must be low.
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