Question

The coefficient of performance of refrigerator, whose efficiency is $25\%$ is

• A. $1$
• B. $3$
• C. $5$
• D. $7$

Answer 1

Answer: (B)

$3$

Answer 2

The efficiency of refrigerator is $\eta = 25\% = 0.25$ $\therefore$ coefficient of performance $\beta =\frac{ 1-\eta}{\eta}$ $=\frac{ 1-0.25}{0.25}$ $= \frac{0.75}{0.25} = 3$