You want to increase the efficiency of a Carnot heat engine by changing the temp

Question

You want to increase the efficiency of a Carnot heat engine by changing the temperature of either its hot or its cold reservoir by the same number of degrees Delta {T}. Which of the following choices will produce the greater increase in its thermodynamic efficiency?

A) Increase the temperature of the hot reservoir by Delta {T}.
B) Decrease the temperature of the cold reservoir by Delta {T}.
C) It would not matter. Both choices would produce the same increase in efficiency, since Delta {T} is the same for both.

Explanation / Answer

efficiency=1-Tc/Th For efficiency to increase,Th should be increased So A) Increase the temperature of the hot reservoir by Delta {T}.

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