WBCS.LIVE practice question

The efficiency of a Carnot engine working between 2270 C and 270 C is :

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 100%
  2. 50%
  3. 40%
  4. 20%

Correct answer and explanation

Correct answer: 40%

Explanation: The Carnot engine efficiency between 227°C (500 K) and 27°C (300 K) is 40%. 📚 Other Information: ▪️ Formula: η = (T₁ – T₂)/T₁. ▪️ Here, T₁ = 500 K, T₂ = 300 K → η = (200/500) = 0.4 = 40%. ▪️ Carnot engine is an ideal heat engine. ▪️ It provides the maximum possible efficiency. ▪️ Real engines (Otto, Diesel) are always less efficient. ▪️ Efficiency depends only on temperature difference, not working substance. ▪️ Invented by Nicolas Léonard Sadi Carnot. ▪️ Concept forms basis of thermodynamics.