Barron's 2nd Edition DT Q70

Barron's Book

70) This question asks us to find the max theoretical efficiency of the engine described. There is a simple formula we could use for this problem.

Where e is the maximum theoretical efficiency, and T[H]/T[C] is the upper/lower bound of the temperature range

There is still one more step. We need to convert the temperature into the SI unit of measurement; we need to convert the temperature from degrees Celsius to degrees Kelvin. To convert to Kelvin, we need to add 273 to the temperature in Celsius.

Where e is the maximum theoretical efficiency

Answer: B