Question

The coefficient of performance of a Carnot refrigerator working between ${30}^{\circ }C$ and $0^{\circ }C$ is

• A. 10
• B. 1
• C. 9

Answer 1

The correct option is C 9

Coefficient of performance of a Carnot refrigerator working between ${30}^{\circ }C$ and $0^{\circ }C$ is
$\beta =\frac{T_2}{T_1-T_2}=\frac{{273}^{\circ }C}{{303}^{\circ }C-{273}^{\circ }C}=\frac{{273}^{\circ }C}{{30}^{\circ }C}\approx 9$