A Carnot engine works between and . What is its efficiency (in %)?
Answer and explanation
Correct answer: B. 50
- 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 50\%.
Answer
50.
Why not the others: 300 is the temperature difference ; 1/2 is the fractional value instead of percentage; 51 is an arithmetic rounding error.
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