Air Conditioning and Heat Pumps Inspection Section#2 Heat Pumps Quiz#1

• Question 1

  Needs Grading

  	At what COP level should the electric back-up heat be turned on and the heat pump turned off?
  	Selected Answer: When COP is less than 1.0, it is costing more to bring heat into the house than it would cost to shut down the heat pump and provide electric heat directly into the house.  Correct Answer:   When C.O.P. drops below 1.0 Response Feedback: [None Given]

• Question 2

  Needs Grading

  	Define balance point with respect to heat pumps.
  	Selected Answer: The balance point of a heat pump is the temperature at which the amount of heat that the heat pump can collect from the outdoor air is exactly equal to the amount of heat being lost to the outdoors through the house.  Correct Answer:   The balance point is the temperature at which the rate of heat delivered by the heat pump is equal to the heat loss to the outdoors. Response Feedback: [None Given]

• Question 3

  Needs Grading

  	Define the coefficient of performance.
  	Selected Answer: COP is the ratio between amount of heat being delivered to the house to the energy used to capture that heat.  Correct Answer:   COP is the ratio of the amount heat being delivered to the indoors versus the amount of electricity being consumed by the heat pump. Response Feedback: [None Given]

• Question 4

  Needs Grading

  	Explain why the location is important for each back-up system: a) Electric heat b) Gas Furnace
  	Selected Answer: The indoor coil is located down-stream of the furnace heat exchanger for gas furnace. Otherwise, it would rust the heat exchanger. For electric heat, it doesn't come with heat exchanger, it doesn't matter which side it is put.  Correct Answer: a) The heat pump gets the first chance to warm the air, allowing the furnace to rest until it's needed. b) In the summer, when the heat pump cools the air before it gets to the furnace, it would condense moisture out of the air on the burner side of the heat exchanger, causing the heat exchanger to corrode. Response Feedback: [None Given]

• Question 5

  Needs Grading

  	The implication of an oversized heat pump during the summer months is
  	Selected Answer: cold, damp house in summer is the sign of over sized heat pump.  Correct Answer:   It would cool the house down too fast without dehumidifying the air, resulting in a cool, damp environment. Response Feedback: [None Given]

• Question 6

  Needs Grading

  	Where is the reversing valve typically located?
  	Selected Answer: It is located close to the compressor.  Correct Answer:   Near the compressor in a cabinet, either indoors or outdoors. Response Feedback: [None Given]

• Question 7

  Needs Grading

  	Why does frost sometimes develop on the outdoor coil of a heat pump?
  	Selected Answer: If the indoor humidity level is high, reducing temperature will result in condensation.  Correct Answer: In winter, the air moving across the coil is cooled and may become saturated. If the temperature is below freezing, frost instead of condensation develops on the coil. Response Feedback: [None Given]

• Question 8

  0 out of 0 points

  	Name two types of heat pumps other than air-to-air.
  	Selected Answer:  water source; ground source Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match Water source Exact Match Ground source Response Feedback: That's incorrect.

• Question 9

  0 out of 0 points

  	The indoor coil on heat pump acts as an evaporator coil in the summer and a ________ coil in the winter.
  	Selected Answer:  condenser Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match Condenser Response Feedback: Well done!!

• Question 10

  0 out of 0 points

  	The outdoor coil act as a condenser coil in the summer and a _________ coil in the winter in a conventional air-to-air pump system.
  	Selected Answer:  evaporator Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match Evaporator Response Feedback: Well done!!

• Question 11

  0 out of 0 points

  	What is a typical heat pump coefficient of performance when the outdoor temperature is 47°F?
  	Selected Answer:  3.0 Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match 3.0 Response Feedback: Well done!!

• Question 12

  0 out of 0 points

  	Heat pumps are generally sized based on the
  	Selected Answer:   cooling load Answers: heating load   cooling load other Response Feedback: Well done!!

• Question 13

  0 out of 0 points

  	Heat pumps may see a temperature difference between outdoors and indoors that is
  	Selected Answer:   greater than what an air conditioner would typically see Answers: smaller than what an air conditioner would typically see the same as what an air conditioner would typically see   greater than what an air conditioner would typically see Response Feedback: Well done!!

• Question 14

  0 out of 0 points

  	The compressor on a heat pump can be
  	Selected Answer:   all of the above Answers: indoors outdoors   all of the above Response Feedback: Well done!!

• Question 15

  0 out of 0 points

  	A gas furnace back-up system typically has the heat exchanger upstream of (before) the heat pump coil.
  	Selected Answer:  True Answers:  True False Response Feedback: Well done!!

• Question 16

  0 out of 0 points

  	An auxiliary electric heating system is typically installed upstream of (before) the heat pump coil.
  	Selected Answer:  False Answers: True  False Response Feedback: Well done!!