A Carnot engine works between and . What is its efficiency (in %)?
Answer and explanation
Correct answer: A. 40
- Step 1: The theoretical thermal efficiency of an ideal Carnot engine operating between high reservoir and low reservoir is .
- Step 2: Substitute source temperature and sink temperature : .
- Step 3: Converting the decimal fraction to a percentage gives an efficiency of 40\%.
Answer
40.
Why not the others: 60 is the heat rejection ratio without subtracting from 1; 200 is the temperature difference without dividing by ; 3/5 is the heat rejected fraction .
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