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Author Question: On a cold day, a heat pump absorbs heat from the outside air at 14F (-10C) and transfers it into a ... (Read 404 times)

CharlieWard

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on: Jul 28, 2018
On a cold day, a heat pump absorbs heat from the outside air at 14F (-10C) and transfers it into a home at a temperature of 86F (30C). Determine the maximum COP of the heat pump.
 a. 0.2
  b. 4.4
  c. 0.5
  d. 7.6
  e. 6.7

Question 2

A heat engine absorbs 2 500 J of heat from a hot reservoir and expels 1 000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2 500 J of heat to the hot reservoir, requiring 1 500 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)


succesfull

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

D

Answer to Question 2

B


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