A Real (Non-Carnot) Heat Engine, Operating Between Heat Reservoirs at Temperatures

question 39

Multiple Choice

A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 650 K and 270 K, performs 4.3 kJ of net work and rejects 8.0 kJ of heat in a single cycle. The thermal efficiency of this heat engine is closest to

• A) 0.35
• B) 0.31
• C) 0.28
• D) 0.38
• E) 0.42