CHEMICAL ENGINEERING THERMODYNAMICS
Answer FINAL EXAM KEY CONCEPTS AND PRObLEM
SOLUTIONS
1. What happens to the entropy of a system undergoing an irreversible
process?
Answer The entropy of the universe increases.
2. What happens to the entropy when two ideal gases at the same temperature
are mixed in a rigid, insulated container?
Answer The entropy of the system increases.
3. Which phenomenon leads to higher entropy production in fluid flow?
Answer Turbulent
flow leads to higher entropy production.
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, 4. What does the entropy change of the system in heat transfer depend on?
Answer The heat transfer rate and reservoir temperature.
5. For a reversible process in a closed system, what is the entropy production?-
Answer Entropy production is zero.
6. What parameter has the greatest influence on the thermal efficiency of a
Rankine cycle?
Answer Steam temperature has the greatest influence.
7. What is the primary advantage of a reheat Rankine cycle?
Answer Increased thermal eflciency.
8. How does regeneration in the Rankine cycle improve efficiency?
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Answer FINAL EXAM KEY CONCEPTS AND PRObLEM
SOLUTIONS
1. What happens to the entropy of a system undergoing an irreversible
process?
Answer The entropy of the universe increases.
2. What happens to the entropy when two ideal gases at the same temperature
are mixed in a rigid, insulated container?
Answer The entropy of the system increases.
3. Which phenomenon leads to higher entropy production in fluid flow?
Answer Turbulent
flow leads to higher entropy production.
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, 4. What does the entropy change of the system in heat transfer depend on?
Answer The heat transfer rate and reservoir temperature.
5. For a reversible process in a closed system, what is the entropy production?-
Answer Entropy production is zero.
6. What parameter has the greatest influence on the thermal efficiency of a
Rankine cycle?
Answer Steam temperature has the greatest influence.
7. What is the primary advantage of a reheat Rankine cycle?
Answer Increased thermal eflciency.
8. How does regeneration in the Rankine cycle improve efficiency?
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