tomobile engine has a thermal efficiency ne surrounding air is at 25 °C. Does the o rmodynamics?

Elements Of Electromagnetics
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Second Law of Thermodynamics

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Second Law of Thermodynamics
7 1. An automobile engine has a thermal efficiency of 48%. The temperature of the fuel is 350 °C,
and the surrounding air is at 25 °C. Does the operation of this engine Violate the second law
of thermodynamics?
2. An inventor claims to have perfected an engine that will produce energy by absorbing heat
from a fuel at 300 °C and rejecting heat to the surroundings at 15 °C while achieving a thermal
efficiency of 60 percent. How would you evaluate his claims?
Transcribed Image Text:Second Law of Thermodynamics 7 1. An automobile engine has a thermal efficiency of 48%. The temperature of the fuel is 350 °C, and the surrounding air is at 25 °C. Does the operation of this engine Violate the second law of thermodynamics? 2. An inventor claims to have perfected an engine that will produce energy by absorbing heat from a fuel at 300 °C and rejecting heat to the surroundings at 15 °C while achieving a thermal efficiency of 60 percent. How would you evaluate his claims?
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