First slide

Refrigerator

Question

An ideal refrigerator has freezer at a temperature of -13°C. The coefficient of performance of the engine is 5. The temperature of the air (to which heat is rejected) will be

Easy

A

325°C
B

325°K
C

39°C
D

320°C

Solution

$\begin{array}{l} β = \frac{Q_{2}}{Q_{1} - Q_{2}} = \frac{T_{2}}{T_{1} - T_{2}} \\ 5 = \frac{260}{T_{1} - 260}; T_{1} - 260 = 52 \\ T_{1} = 312 K = 39^{\circ} C \end{array}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App