A Carnot Heat Engine Runs Between a Cold Reservoir at Temperature

question 47

Multiple Choice

A Carnot heat engine runs between a cold reservoir at temperature T_C and a hot reservoir at temperature T_H. You want to increase its efficiency. Of the following, which change results in the greatest increase in efficiency? The value of $\Delta$ T is the same for all changes.

• A) Raise the temperature of the hot reservoir by \(\Delta\)T
• B) Raise the temperature of the cold reservoir by \(\Delta\)T
• C) Lower the temperature of the hot reservoir by \(\Delta\)T
• D) Lower the temperature of the cold reservoir by \(\Delta\)T
• E) Lower the temperature of the hot reservoir by (1/2)\(\Delta\)T and raise the temperature of the cold reservoir by (1/2)\(\Delta\)T

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