Thermodynamics - Result Question 36
38. The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
(a) $26.8 %$
(c) $12.5 %$
(b) $20 %$
(d) $6.25 %$
[2018]
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Answer:
Correct Answer: 38. (a)
Solution:
- (a) Efficiency of ideal heat engine, $\eta=(1-\frac{T_2}{T_1})$
Sink temperature, $T_2=100^{\circ} C=100+273=373 K$
Source temperature, $T_1=0^{\circ} C=0+273=273 K$
Percentage efficiency, $% \eta=(1-\frac{T_2}{T_1}) \times 100$
$ =(1-\frac{273}{373}) \times 100=(\frac{100}{373}) \times 100=26.8 % $
