Thermodynamics Question 276
Question: The temperature of source and sink of a heat engine are $ 127{}^\circ C $ and $ 27{}^\circ C $ respectively. An inventor claims its efficiency to be 26%, then:
Options:
A) it is impossible
B) it is possible with high probability
C) it is possible with low probability
D) data are insufficient.
Show Answer
Answer:
Correct Answer: A
Solution:
[a] $ \eta =1-\frac{300}{400}=\frac{100}{400}=\frac{1}{4} $
$ \eta =\frac{1}{4}\times 100=25% $ Hence, it is not possible to have efficiency more than 25%.
