Correct Answer - Option 2 : 7.5
Concept:
The Coefficient of performance for any device calculated by,
\(COP = \frac{{Desired\;effect}}{{work\;input}}\;\;\; \)
Calculation:
Given:
Here the desired effect is heating a house in winter with the help of a heat pump.
Desired effect = 60 Mcal/hr, Work input = 8 Mcal/hr
\(COP = \frac{{Desired\;effect}}{{work\;input}}\;\; =\frac{60}{8}= 7.5\; \)