Question

Efficiency of a Carnot engine is given as $80\%$. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

• A. $0.25$
• B. $0.5$
• C. $0.8$
• D. $1.25$

Answer 1

The correct option is A $0.25$

Efficiency of a Carnot engine is given as 80% or $\eta =0.80$

If the cycle direction be reversed

The relation between the effecicy and COP is defined by formula

$COP=\frac{1-\eta }{\eta }=\frac{1-0.80}{0.80}=0.25$