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A frictionless heat engine can be 100% efficient only if the exhaust temperature is
  • a)
    equal to its input temperature
  • b)
    less than its input temperature
  • c)
    0°C
  • d)
    0 K
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A frictionless heat engine can be 100% efficient only if the exhaust t...

Efficiency of a Reversible Heat Engine:

η = 1 when TL = 0 for any TH
A heat engine can work on 100% efficiency when there is only heat input and no heat loss.
As W = QH – QL
All the heat supplied will be used in producing the work and there will be no losses.
All the temperature scale is taken in Kelvin.
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Most Upvoted Answer
A frictionless heat engine can be 100% efficient only if the exhaust t...
B) less than its input temperature
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Community Answer
A frictionless heat engine can be 100% efficient only if the exhaust t...
Why kelvin is used not celcius?
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A frictionless heat engine can be 100% efficient only if the exhaust temperature isa)equal to its input temperatureb)less than its input temperaturec)0°Cd)0 KCorrect answer is option 'D'. Can you explain this answer?
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