Question

A heat engine has a cold reservoir of 250 k and a hot reservoir of 715 k. What is the maximum efficiency of the engine? a. 65. 0% b. 60. 8% c. 73. 6% d. 58. 6% e. 69. 1%.

Answer 1

Heat in = 715 K

Heat out = 250 K

Heat converted to work = 715 - 250 = 465 K

Efficiency = 465 / 715 = .65

(a) Maximum efficiency = 65%