Question

The coefficient of performance of a refrigerator working between $10{}^{\circ }C$ and $20{}^{\circ }C$ is

• A. $28.3$
• B. $29.3$
• C. $2$
• D. $0.5$

Answer 1

Answer: (A)

$T_1=273+20=293K,T_2=273+10=283K$
Coefficient of performance
$=\frac{T_2}{T_1-T_2}=\frac{283}{293-283}=\frac{283}{10}=28.3$