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Author Question: A heat engine absorbs 2500 J of heat from a hot reservoir and expels 1000 J to a cold reservoir. ... (Read 138 times)

kamilo84

  • Sr. Member
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  • Posts: 495
on: Jul 28, 2018
A heat engine absorbs 2500 J of heat from a hot reservoir and expels 1000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2500 J of heat to the hot reservoir, requiring 1500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
 a. 1.0 (no)
  b. 1.0 (yes)
  c. 1.5 (yes)
  d. 1.5 (no)
  e. 2.5 (no)

Question 2

A company that produces pulsed gas heaters claims their efficiency is approximately 90. If an engine operates between 250C and 25C, what is its maximum thermodynamic efficiency?
 a. 83
  b. 65
  c. 43
  d. 90
  e. 56


tsternbergh47

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  • Posts: 311
Reply #1 on: Jul 28, 2018
Answer to Question 1

b

Answer to Question 2

c


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