Question

1. A Carnot engine has a hot reservoir at 250 degrees C, and a a cold reservoir at 25.0 degrees C. What is the efficiency of this engine?

A) 10%

B) 43%

C) 57%

D) 90%

2. A heat engine does 50 J of work and dumps 30 J of heat into the cold reservoir. How much heat was absorbed from the hot reservoir?

A) 20 J

B) 30 J

C) 50 J

D) 80 J

3. A heat engine does 50 J of work and dumps 30 J of heat into the cold reservoir. What was the net heat transfer into the heat engine?

A) 20 J

B) 30 J

C) 50 J

D) 80 J

4. A heat engine does 50 J of work and dumps 30 J of heat into the cold reservoir. What is the efficiency of the engine?

A) 25.0%

B) 37.5%

C) 60.0%

D) 62.5%

5. A heat engine absorbs 200 J of heat from its hot reservoir and dumps 120 J of heat into the cold reservoir. What is the power output if the engine is run at 60 rpm?

A) 80 W

B) 120 W

C) 200 W

D) 320 W

Answer 1