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Week 4-5 - Energy Transformations, Efficiency, and PV Diagrams Capabilities

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12 Physics (12 Physics Fundamental Skills) Quiz on Week 4-5 - Energy Transformations, Efficiency, and PV Diagrams Capabilities, created by Ryan Elwell on 09/12/2019.
Ryan Elwell
Quiz by Ryan Elwell, updated more than 1 year ago
Ryan Elwell
Created by Ryan Elwell over 4 years ago
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Resource summary

Question 1

Question
What does the area inside a closed cycle on a PV Diagram tell us?
Answer
  • The work done during the cycle
  • The energy lost in one cycle
  • The pressure and volume of a system
  • The velocity of a cycle

Question 2

Question
Which of the following processes are isothermal?
Image:
App 01 (image/jpeg)
Answer
  • ab
  • bc
  • cd
  • da
  • None of the processes are isothermal

Question 3

Question
Which of the following processes are isobaric?
Image:
App 01 (image/jpeg)
Answer
  • ab
  • bc
  • cd
  • da
  • None of the processes are isobaric

Question 4

Question
Which of the following processes are isochoric?
Image:
App 01 (image/jpeg)
Answer
  • ab
  • bc
  • cd
  • da
  • None of the processes are isochoric

Question 5

Question
What is the total change in energy for a closed cycle PV diagram?
Answer
  • Always equal to zero
  • Equal to the work done by the system
  • Equal to the work done on the system
  • The total area under the PV diagram curves

Question 6

Question
We define thermal efficiency as:
Answer
  • The ratio of heat input to work output
  • The ratio of heat input to cold output
  • The ratio of cold input to heat output
  • The ratio of work done to cold output

Question 7

Question
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
Answer
  • 115,000

Question 8

Question
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
Answer
  • 92,000

Question 9

Question
What is unique about a Carnot Cycle heat engine?
Answer
  • It has no energy loss and is 100% efficient
  • It has equal hot and cold work inputs
  • It has double the heat input as cold output
  • It has the maximum possible efficiency of 99%

Question 10

Question
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]
Answer
  • 1.6
  • J / K
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