Air Conditioning and Heat Pumps Inspection Section#1 Air Conditioning Quiz#4

• Question 1

  Needs Grading

  	Ducts passing through unconditioned spaces such as attics or crawlspaces should be?
  	Selected Answer: insulated and air-tight Correct Answer:   Insulated, with appropriate vapor barriers. Response Feedback: [None Given]

• Question 2

  Needs Grading

  	List eight common duct problems on cooling systems.
  	Selected Answer: 1. Undersized or incomplete 2. Supply and return register problems 3. Dirty 4. Disconnected or leaking 5. Obstructed or collapsed 6. Poor support 7. Poor balance 8. Humidifier damper missing Correct Answer: 1. Undersized or incomplete 2. Supply and return register problems 3. Dirty 4. Disconnected and leaking 5. Obstructed or collapsed 6. Poor support 7. Poor balance 8. Humidifier damper missing Response Feedback: [None Given]

• Question 3

  Needs Grading

  	List four common fan problems.
  	Selected Answer: 1. Excess noise/vibration 2. Inoperative 3. Corrosion or mechanical damage 4. Obstructed airflow Correct Answer:   1. Excessive noise/vibration 2. Inoperative 3. Corrosion or mechanical damage 4. Obstructed air flow Response Feedback: [None Given]

• Question 4

  Needs Grading

  	List seven common evaporator fan problems.
  	Selected Answer: 1. Undersized blower or motor 2. Dirty fan 3. Dirty or missing filter 4. Inoperative 5. Misadjustment of belt or pulley 6. Corrosion/damage 7. Excess noise/vibration Correct Answer: 1. Undersized blower or motor 2. Misadjustment of belt or pulley 3. Excessive noise/vibration 4. Dirty or missing filter 5. Inoperative 6. Corrosion/damage 7. Dirty fan Response Feedback: [None Given]

• Question 5

  Needs Grading

  	List two types of drives for evaporator fans.
  	Selected Answer: 1. Belt drive 2. Direct drive Correct Answer:   Belt drive and direct drive. Response Feedback: [None Given]

• Question 6

  Needs Grading

  	What are the implications of a dirty or missing air filter with respect to the evaporator fan?
  	Selected Answer: Poor house comfort, high energy costs,premature failure of heating and air conditioning components and dirt in the ducts and throughout the house.  Correct Answer: Poor house comfort, high energy costs, premature failure of heating and air conditioning components, dirt in the ducts and throughout the house. Response Feedback: [None Given]

• Question 7

  Needs Grading

  	What clues might you find to indicate that the ductwork has been professionally cleaned?
  	Selected Answer: Round plugs, roughly 1-1/2 inch in diameter, along the ductwork and 6-inch square metal patches near the furnace or air handler indicate professional duct cleaning has been done.  Correct Answer:   There may be round plugs (1½ in diameter) in the ductwork, and 6-inch square metal patches near the furnace or air handler. Response Feedback: [None Given]

• Question 8

  Needs Grading

  	What is a typical level of insulation on ductwork?
  	Selected Answer: 1-1/2 inch to 2 inch Correct Answer:   1½ to 2 inches typically, providing roughly R 7. Response Feedback: [None Given]

• Question 9

  Needs Grading

  	What is the implication of finding the humidifier duct damper in the wrong position?
  	Selected Answer: 1. Ineffective air-conditioning 2. Iced-up evaporator coil 3. Reduced comfort levels 4. Damage to the compressor Correct Answer: If it is left open, cool air could be drawn back into the cold air return and back over the evaporator coil, causing it to ice up, and reducing its efficiency. Response Feedback: [None Given]

• Question 10

  Needs Grading

  	What is the purpose of the humidifier duct damper?
  	Selected Answer: to close off airflow in summer Correct Answer:   It shuts off the airflow through the humidifier in air conditioning season. Response Feedback: [None Given]

• Question 11

  Needs Grading

  	What is the typical inlet and outlet temperature of air across the condenser fan?
  	Selected Answer: 100F Correct Answer:   The inlet temperature is outdoor air temperature, and outlet temperature is roughly 15 to 20 degrees F higher than the outdoor temperature. Response Feedback: [None Given]

• Question 12

  Needs Grading

  	What is the wrong position for a humidifier duct damper in the summer?
  	Selected Answer: Open Correct Answer:   Left open in the summer. Response Feedback: [None Given]

• Question 13

  Needs Grading

  	What other function might the evaporator fan perform?
  	Selected Answer: Moving house air in winter Correct Answer:   It is also the furnace fan. Response Feedback: [None Given]

• Question 14

  Needs Grading

  	Where is the condenser fan in a split system located?
  	Selected Answer: outside the house Correct Answer:   The condenser fan is outdoors in the condenser unit. Response Feedback: [None Given]

• Question 15

  Needs Grading

  	Why should bedroom doors be undercut if there is no return air grille in the bedroom?
  	Selected Answer: To allow air to reach return registers.  Correct Answer:   The room will overheat because the bedroom becomes pressurized, preventing more cool air from entering. Response Feedback: [None Given]

• Question 16

  0 out of 0 points

  	Where is the evaporator fan typically located in a split system?
  	Selected Answer:   Indoors Answers: Outdoors   Indoors Both outdoors and indoors Response Feedback: Well done!!

• Question 17

  0 out of 0 points

  	Flex ducts have less friction loss than rigid ductwork.
  	Selected Answer:  False Answers: True  False Response Feedback: Well done!!

• Question 18

  0 out of 0 points

  	High level returns are more appropriate for heating than cooling.
  	Selected Answer:  False Answers: True  False Response Feedback: Well done!!

• Question 19

  0 out of 0 points

  	Oversized ducts are a common problem.
  	Selected Answer:  False Answers: True  False Response Feedback: Well done!!

• Question 20

  0 out of 0 points

  	The amount of air that must cross an evaporator coil in a heating climate is less than the amount of air that must cross a conventional furnace heat exchanger coil.
  	Selected Answer:  False Answers: True  False Response Feedback: Well done!!