Question

Calculate the efficiency of a Carnot engine working between boiling point and freezing point of water.

• A. $66.67\%$
• B. $33.52\%$
• C. $26.81\%$
• D. $50\%$

Answer 1

The correct option is C $26.81\%$

Boiling Point of water, $T_1={100}^{\circ }C$
$=100+273=373K$
Freezing point of water, $T_2=0^{\circ }C$
$=0+273=273K$
$\eta =1-\frac{T_2}{T_1}$
$\eta =1-\frac{273}{373}=\frac{100}{373}$
$\eta =\frac{100}{373}\times 100\%=26.81\%$