Question

A Carnot engine takes 103 Kcal of heat from reservoir at ${627}^{o}C$ and exhausts it to a sink at ${27}^{o}C$. The efficiency of the engine will be:

• A. 22.2 %
• B. 33.3%
• C. 44.4%
• D. 66.6%

Answer 1

The correct option is D 66.6%

Efficiency of the carnot engine$\left(\eta \right)=1-\frac{T_c}{T_h}$

$=1-\frac{300}{900}$

$=1-\frac{1}{3}=0.6666$

Therefore, efficiency %$=66.6$%

Hence, option D is correct.