Answer: The thermal efficiency of the engine is 41.09 %.
Explanation:
Efficiency is the ratio of the useful work performed to the total energy expended or heat taken in.
Formula for thermal efficiency of engine is
[tex]\eta=1- \frac{Q_2}{Q_1}\times 100[/tex]
[tex]\eta[/tex] = efficiency
[tex]{Q_2}[/tex] = heat rejected = 266.7 kJ
[tex]{Q_1}[/tex] = heat extracted = 452.8 kJ
Putting in the values we get:
[tex]\eta=1- \frac{266.7 kJ}{452.8 kJ }\times 100[/tex]
[tex]\eta=0.41\times 100[/tex]
[tex]\eta =41.09\%[/tex]
The thermal efficiency of the engine is 41.09 %.
