The efficiency of the Carnot engine working between 150°C and 50°C is__________?
Correct answer: C. 23.6%
- A. 50%
- B. 100%
- C. 23.6%
- D. 29.4%
Explanation
Carnot efficiency is η = 1 - Tc/Th, with temperatures in kelvin. Here Th = 150°C + 273 K = 423 K and Tc = 50°C + 273 K = 323 K, so η = 1 - 323 K/423 K = 0.2364, or 23.6%. The likely choice is d, because students may use Celsius temperatures directly instead of converting them to kelvin.
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About Energy Losses and Efficiency
Efficiency compares useful output energy or power with the total input, usually expressed as a percentage. The topic covers energy losses through friction, heating, resistance and sound, along with power ratings and Sankey diagrams. Efficiency is not the same as conservation of energy, because lost energy is transferred rather than destroyed.
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