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

$\beta = \frac { 1 - \eta } { \eta } = \frac { 1 - 0.25 } { 0.25 } = \frac { 0.75 } { 0.25 } = 3$