Question

Now Tony settles upon a Carnot engine. Calculate the efficiency of the Carnot engine if the temperature it operates between are 350 K and 250 K.

• A. $\frac{2}{7}$
• B. $\frac{5}{7}$
• C. $\frac{3}{7}$
• D. $\frac{4}{7}$

Answer 1

The correct option is A

$\frac{2}{7}$

The efficiency of a Carnot engine is given by the formula

${\eta }_{H.E}=1-\frac{T_L}{T_H}$

Substituting for known values we get

${\eta }_{H.E}=1-\frac{250}{350}=\frac{2}{7}$