Q. In a mechanical refrigerator, the low temperature coils are at a temperature of $- 23℃$ and the compressed gas in the condenser has a temperature of $27℃$. The theoretical coefficient of performance is
A) 5
B) 8
C) 6
D) 6.5
Explanation
(a) Coefficient of performance $K = \frac{T_{2}}{T_{1} - T_{2}}$
$= \frac{(273 - 23)}{(273 + 27) - (273 - 23)} = \frac{250}{300 - 250} = \frac{250}{50} = 5$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.