Question

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

• A. 0.125
• B. 26.8 %
• C. 6.25 %
• D. 0.2

Answer 1

Answer: (B)

26.8 %

Answer 2

Efficiency of ideal heat engine , $\eta = \left(1- \frac{T_{2}}{T_{1}}\right)$
$T_2$: Sink temperature
$T_1$ : Source temperature
$\% \eta = \left(1- \frac{T_{2}}{T_{1}} \right)\times100$
$= \left(1- \frac{273}{373}\right) \times100$
$= \left(\frac{100}{373}\right) \times100 = 26.8 \%$