Question

The efficiency of a Carnot engine having source temperature ${127}^{\circ }C$ and sink temperature ${27}^{\circ }C$ is:

• A. $10$%
• B. $25$%
• C. $50$%
• D. $60$%

Answer 1

The correct option is B $25$%

Efficiency of carnot engine is written as-

$\eta =1-\frac{T_2}{T_1}$

$=1-\frac{27+273}{127+273}$

$=1-\frac{300}{400}$

$=25\%$