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Residential Air Conditioning

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
15 A
They are physically larger
Yes

2. How is insulation around a duct rated?
With an are rating
Inside diameter (ID)
300
Yes

3. 10 SEER is classified as what kind of efficiency?
With 4' saddles
Latent and sensible
With a minimum of three evenly spaced self-tapping screws
Standard

4. What are the three ways a motor can fail electrically?
400
Indoor fan motor - outdoor fan motor - and the compressor
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Shorted winding - open winding - and grounded winding

5. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
S-clips and drives (cleats)
45 degrees F
With a minimum of three evenly spaced self-tapping screws

6. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
45-55%
Subtract ambient temperature from 100
25-ft or 50-ft

7. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Btu/hr (output) / wattage (input)
15% silphos
Nitrogen with a small amount of refrigerant
To lower the amount of pressure drop through the coil

8. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
A swaging tool
Yes
In series

9. What is it called when liquid refrigerant gets into the compressor?
TXV
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Slugging
To remove humidity and lower dry bulb temperature

10. What are the three crafts normally associated with an air-conditioned installation?
Nominal-sized tubing
Duct - electrical - and mechanical
Compressor
Outside of the male fitting

11. What are the components of a hard-start kit?
Potential relay and start capacitor
20 degrees above ambient
400
It will have a decrease in superheat

12. What sort of pressure will a push-through evaporator have?
Positive
18 gauge
18 gauge
45-55%

13. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
20 degrees F
The suction line or the low-pressure side
400

14. How long should you leave a system off once you kill power before restarting it?
2 minutes
30-35 degrees above ambient
12000
With 4' saddles

15. Will a dirty condenser cause a rise or fall in pressure?
Positive
Duct - electrical - and mechanical
Yes
Rise

16. The compressor is cooled by liquid refrigerant. (True of False)
Blended refrigerants
Suction
Nitrogen with a small amount of refrigerant
False

17. How do you calculate ballpark superheat?
L-type
Subtract ambient temperature from 100
40 degrees F
A piston type metering device

18. At what temperature will soft solder melt?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Inside diameter (ID)
The suction line or the low-pressure side
Below 800 degrees F

19. 8' round duct has a ballpark cfm of what?
200
20 degrees F
Latent and sensible
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

20. How will too much refrigerant effect subcooling?
It will be high
Heat loss
High
A diffuser

21. Where do you check the amps on a motor?
L-type
Stranded
L-type
On the common terminal

22. What percentage silver do you need to use for an are-410 system?
True
Indoor fan motor - outdoor fan motor - and the compressor
15% silphos
2

23. What are the two types of blower drives?
Btu/hr (output) / wattage (input)
Belt drive and direct drive
20 A
8-12 degrees F

24. How many BTU's per ton?
Nitrogen with a small amount of refrigerant
12000
140 degrees F
6

25. How is the high pressure switch wired with the low pressure switch?
In parallel
Average feet per minute X area in square feet (H' x W'/144)
With a minimum of three evenly spaced self-tapping screws
6

26. How do you calculate EER?
Btu/hr (output) / wattage (input)
40 degrees F
Fiberglass
2 minutes

27. If the rpm's are 3450 - how many poles does the motor have?
On the common terminal
The suction line or the low-pressure side
12000
2

28. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
The takeoff fitting
Inclined manometer
Boil the liquid refrigerant out ot the oil within the crankcase

29. How is insulation around a duct rated?
With an are rating
15 A
TXV
12000

30. How does ACR copper pipe come?
Nitrogen with a small amount of refrigerant
Suction
Inclined manometer
Dehydrated with caps on each end

31. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
TXV
Any amount
140 degrees F
Average feet per minute X area in square feet (H' x W'/144)

32. What are the three major power-consuming devices on an air-conditioning system?
By increasing the surface of the condenser coil
18 gauge
L-type
Indoor fan motor - outdoor fan motor - and the compressor

33. 7' round duct has a ballpark cfm of what?
30 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
RLA/FLA x 5
150

34. How will too much refrigerant effect superheat?
With 4' saddles
On the common terminal
Static pressure - velocity pressure - and total pressure
It will be low

35. On what terminal do you check amperage?
100
The takeoff fitting
Common
15 A

36. What can cause a decrease in suction pressure on an air-conditioning system?
Boil the liquid refrigerant out ot the oil within the crankcase
High
To lower the amount of pressure drop through the coil
A dirty evaporator

37. How do you calculate cfm?

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38. Most duct insulation is made of what?
With an are rating
Infiltration and ventilation
Fiberglass
Blended refrigerants

39. How are round ducts connected to one another?
Pistons
Yes
40 degrees F
With a minimum of three evenly spaced self-tapping screws

40. The fan switch opens at what temperature?
ACR (air-conditioning refrigeration) tubing
They are physically larger
Slugging
105 degrees F

41. How is flexible duct supported?
A band 4 inches or more in width
Pull a vacuum
Suction
20 degrees above ambient

42. What is considered normal operating conditions?
Rise
30-35 degrees above ambient
12000
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

43. If the suction pressure rises - what happens to the head pressure?
Outside diameter (OD)
Btu/hr (output) / wattage (input)
Vapor
It also rises

44. 6' round duct has a ballpark cfm of what?
4
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Below 800 degrees F
100

45. How many amps can 12 g wire handle?
Potential relay and start capacitor
20 A
Outside diameter (OD)
2 minutes

46. What kind of copper tubing is used for plumbing and heating applications?
5 degrees
Nominal-sized tubing
Yes
When it is a pull-through evaporator

47. How are round ducts supported?

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48. In what state is the refrigerant in the compressor?
Individual return air systems and central return air systems
Vapor
No
On the common terminal

49. What gauge is thermostat wire?
When the system is under pressure
When the system is under pressure
18 gauge
They are physically larger

50. Which type of wire can handle a higher ampacity?
150
True
Stranded
Outside diameter (OD)