Understanding Heat Engines and Refrigeration Systems

1. Chapter 19

2. Rank in order, from largest to smallest, the work Wout performed by these four heat engines. 1. Wb > Wa > Wc > Wd 2. Wb > Wa > Wb > Wc 3. Wb > Wa > Wb = Wc 4. Wd > Wa = Wb > Wc 5. Wd > Wa > Wb > Wc

3. Rank in order, from largest to smallest, the work Wout performed by these four heat engines. 1. Wb > Wa > Wc > Wd 2. Wb > Wa > Wb > Wc 3. Wb > Wa > Wb = Wc 4. Wd > Wa = Wb > Wc 5. Wd > Wa > Wb > Wc

4. It’s a really hot day and your air conditioner is broken. Your roommate says, “Let’s open the refrigerator door and cool this place off.” Will this work? 1. Yes. 2. It might, but it will depend on how hot the room is. 3. No.

5. It’s a really hot day and your air conditioner is broken. Your roommate says, “Let’s open the refrigerator door and cool this place off.” Will this work? 1. Yes. 2. It might, but it will depend on how hot the room is. 3. No.

6. What is the thermal efficiency of this heat engine? 1. 0.10 2. 0.25 3. 0.50 4. 4 5. Can’t tell without knowing QC.

7. What is the thermal efficiency of this heat engine? 1. 0.10 2. 0.25 3. 0.50 4. 4 5. Can’t tell without knowing QC.

8. What, if anything, is wrong with this refrigerator? 1. It violates the first law of thermodynamics. 2. It violates the second law of thermodynamics. 3. It violates the third law of thermodynamics. 4. Nothing is wrong.

9. What, if anything, is wrong with this refrigerator? 1. It violates the first law of thermodynamics. 2. It violates the second law of thermodynamics. 3. It violates the third law of thermodynamics. 4. Nothing is wrong.

10. Could this heat engine be built? 1. Yes. 2. No. 3. It’s impossible to tell without knowing what kind of cycle it uses.

11. Could this heat engine be built? 1. Yes. 2. No. 3. It’s impossible to tell without knowing what kind of cycle it uses.

12. Chapter 19 Reading Quiz

13. What is the generic name for a cyclical device that transforms heat energy into work. 1. Refrigerators 2. Thermal Motors 3. Heat Engines 4. Carnot Cycles 5. Otto processors

14. What is the generic name for a cyclical device that transforms heat energy into work. 1. Refrigerators 2. Thermal Motors 3. Heat Engines 4. Carnot Cycles 5. Otto processors

15. The area enclosed within a pV curve is 1. the work done by the system during one complete cycle. 2. the work done on the system during one complete cycle. 3. the thermal energy change of the system during one complete cycle. 4. the heat transferred out of the system during one complete cycle.

16. The area enclosed within a pV curve is 1. the work done by the system during one complete cycle. 2. the work done on the system during one complete cycle. 3. the thermal energy change of the system during one complete cycle. 4. the heat transferred out of the system during one complete cycle.

17. The maximum possible efficiency of a heat engine is determined by 1. its design. 2. the amount of heat that flows. 3. the maximum and minimum pressure. 4. the compression ratio. 5. the maximum and minimum temperature.

18. The maximum possible efficiency of a heat engine is determined by 1. its design. 2. the amount of heat that flows. 3. the maximum and minimum pressure. 4. the compression ratio. 5. the maximum and minimum temperature.

19. The engine with the largest possible efficiency uses a 1. Brayton cycle. 2. Joule cycle. 3. Carnot cycle. 4. Otto cycle. 5. Diesel cycle.

20. The engine with the largest possible efficiency uses a 1. Brayton cycle. 2. Joule cycle. 3. Carnot cycle. 4. Otto cycle. 5. Diesel cycle.