Question

The efficiency of an ideal heat engine between the freezing and boiling point of water is:

• A. $26.8\%$
• B. $20\%$
• C. $6.25\%$
• D. $12.5\%$

Answer 1

The correct option is A $26.8\%$

$\eta =\frac{T_1-T_2}{T_1}\times 100$
$T_1=373,T_2=273$
$\Rightarrow \eta =\frac{100}{373}\times 100=26.8\%$