Quiz
Week 4-5 - Energy Transformations, Efficiency, and PV Diagrams Capabilities
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Perguntas do quiz (10)
1What does the area inside a closed cycle on a PV Diagram tell us?
- AThe work done during the cycle
- BThe energy lost in one cycle
- CThe pressure and volume of a system
- DThe velocity of a cycle
2Which of the following processes are isothermal?
- Aab
- Bbc
- Ccd
- Dda
- ENone of the processes are isothermal
3Which of the following processes are isobaric?
- Aab
- Bbc
- Ccd
- Dda
- ENone of the processes are isobaric
4Which of the following processes are isochoric?
- Aab
- Bbc
- Ccd
- Dda
- ENone of the processes are isochoric
5What is the total change in energy for a closed cycle PV diagram?
- AAlways equal to zero
- BEqual to the work done by the system
- CEqual to the work done on the system
- DThe total area under the PV diagram curves
6We define thermal efficiency as:
- AThe ratio of heat input to work output
- BThe ratio of heat input to cold output
- CThe ratio of cold input to heat output
- DThe ratio of work done to cold output
7An automobile engine has an efficiency of 20% and produces an average of 23,000 J of mechanical work per second during operation. How much heat input is required?
3 SF.
E = [blank_start]115,000[blank_end] Joules- A115,000
8An automobile engine has an efficiency of 20% and produces an average of 23,000 J of mechanical work per second during operation. How much heat is discharged as waste heat from this engine per second?
2 SF.
E = [blank_start]92,000[blank_end] Joules- A92,000
9What is unique about a Carnot Cycle heat engine?
- AIt has no energy loss and is 100% efficient
- BIt has equal hot and cold work inputs
- CIt has double the heat input as cold output
- DIt has the maximum possible efficiency of 99%
101200 J of heat flowing spontaneously through a copper rod from a hot reservoir 650 K to a cold reservoir at 350 K. Determine
the amount by which this irreversible process changes the entropy of the universe, assuming that no other changes occur.
First blank is for the numeric value. The second blank is for the units, putting a space between all characters.
s = [blank_start]1.6[blank_end] [blank_start]J / K[blank_end]- A1.6
- BJ / K
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- O usuário eliminou as informações de disciplina Quiz sobre Week 4-5 - Energy Transformations, Efficiency, and PV Diagrams Capabilities, criado por Usuário eliminado em 28-01-2020.
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- Usuário eliminado
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- Criado em 28 jan 2020 · atualizado em 3 fev 2020
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