A Carnot heat engine runs between a cold reservoir at temperature TC and a hot r

Question

A Carnot heat engine runs between a cold reservoir at temperature TC and a hot reservoir at temperature TH. You want to increase its eciency. Of the following, which change results in the greatest increase in eciency? The value of T is the same for all changes. A. Raise the temperature of the hot reservoir by T B. Raise the temperature of the cold reservoir by T C. Lower the temperature of the hot reservoir by T D. Lower the temperature of the cold reservoir by T E. Lower the temperature of the hot reservoir by 1 2T and raise the temperature of the cold reservoir by 1/2T explain please

A heat engine that in each cycle does positive work and loses energy as heat, with no heat energy input, would violate: A. the zeroth law of thermodynamics B. the rst law of thermodynamics C. the second law of thermodynamics D. the third law of thermodynamics E. Newton’s second law

Explanation / Answer

Efficiency of heat engine =1-hightemperature/low temperature. By increasing hot water temperature we can increase efficiency. Option A correct.

2. Energy conservation give so first law thermodynamic.

Option B correct.

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