Effect of temperature difference between two reservoirs of heat pump on COP - Thermodynamics

Q.  What is the effect of decrease in temperature difference between two reservoirs of heat pump on its COP?
- Published on 19 Aug 15

a. COP increases with decreases in temperature difference between two reservoirs
b. COP decreases with decreases in temperature difference between two reservoirs
c. COP does not affected by change in temperature difference between two reservoirs
d. cannot say

ANSWER: COP increases with decreases in temperature difference between two reservoirs

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