20427062
Descripción
Test por Ryan Elwell, actualizado hace más de 1 año
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Creado por Ryan Elwell
hace casi 5 años
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Pregunta 1
Pregunta
What does the area inside a closed cycle on a PV Diagram tell us?
Respuesta
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The work done during the cycle
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The energy lost in one cycle
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The pressure and volume of a system
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The velocity of a cycle
Pregunta 2
Respuesta
-
ab
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bc
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cd
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da
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None of the processes are isothermal
Pregunta 3
Respuesta
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ab
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bc
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cd
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da
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None of the processes are isobaric
Pregunta 4
Respuesta
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ab
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bc
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cd
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da
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None of the processes are isochoric
Pregunta 5
Pregunta
What is the total change in energy for a closed cycle PV diagram?
Respuesta
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Always equal to zero
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Equal to the work done by the system
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Equal to the work done on the system
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The total area under the PV diagram curves
Pregunta 6
Pregunta
We define thermal efficiency as:
Respuesta
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The ratio of heat input to work output
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The ratio of heat input to cold output
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The ratio of cold input to heat output
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The ratio of work done to cold output
Pregunta 7
Pregunta
An 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
Respuesta
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115,000
Pregunta 8
Pregunta
An 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
Respuesta
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92,000
Pregunta 9
Pregunta
What is unique about a Carnot Cycle heat engine?
Respuesta
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It has no energy loss and is 100% efficient
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It has equal hot and cold work inputs
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It has double the heat input as cold output
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It has the maximum possible efficiency of 99%
Pregunta 10
Pregunta
1200 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]
Respuesta
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1.6
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J / K
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