Question

The coefficient of performance of a refrigerator working between ${17}^{0}C$ and ${27}^{0}C$ is:

• A. $28$
• B. $29$
• C. $30$
• D. $32$

Answer 1

The correct option is B $29$

he coefficient of performance of a refrigerator working between ${17}^{0}C\to =273+17=290K$ and ${27}^{0}C$$\to =273+27=300K$ is

Coefficient of performance of a refrigerator is given as

$COP=\frac{T_{cold}}{T_{hot}-T_{cold}}$

$=\frac{290}{(300-290)}=29$