Question

A refrigerator is to maintain eatables kept inside at $9^{0}C$. Calculate the coefficient of performance, if the room temperature iss ${36}^{0}C$.

• A. $10.4$
• B. $11.5$
• C. $9.8$
• D. none of these

Answer 1

The correct option is A $10.4$

A refrigerator is to remove heat from the eatable kept inside at $9^{o}C\to 273+9=282K.$ Calculate the coefficient of performance, if the room temperature is ${36}^{0}C$$\to 273+36=309K$.

Coefficient of performance of a refrigerator is given as

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

$=\frac{282}{(309-282)}=10.444$