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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. How is nominal-sized tubing sized?
Blended refrigerants
Inside diameter (ID)
In series
Side-by-side and over-and-under

2. The fan switch closes at what temperature?
140 degrees F
Common
Yes
45 degrees F

3. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Over 800 degrees F
L-type
Average feet per minute X area in square feet (H' x W'/144)
Belt drive and direct drive

4. How will too much refrigerant effect subcooling?
Compressor
Below 800 degrees F
It will be high
30 degrees F

5. Where do you install a trap on a drain line?
Dehydrated with caps on each end
Before the vent
Standard
1/4'

6. How are the condenser coils different on a high-efficiency unit?
Any amount
A dirty evaporator
They are larger
Static pressure - velocity pressure - and total pressure

7. What are the two types of return air systems in residential installations?
Indoor fan motor - outdoor fan motor - and the compressor
Individual return air systems and central return air systems
18 gauge
12000

8. What are the two types of blower drives?
300
Slugging
12000
Belt drive and direct drive

9. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
40 degrees F
Pi x radius squared
Blended refrigerants

10. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Heat loss
8-12 degrees F
Belt drive and direct drive

11. What can cause a decrease in suction pressure on an air-conditioning system?
They are larger
A dirty evaporator
Static pressure - velocity pressure - and total pressure
Indoor fan motor - outdoor fan motor - and the compressor

12. When must a copper joint never be soldered or brazed?
30-35 degrees above ambient
When the system is under pressure
Over 800 degrees F
2

13. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Shorted winding - open winding - and grounded winding
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
To remove humidity and lower dry bulb temperature
20 degrees F

14. What are the three crafts normally associated with an air-conditioned installation?
True
By increasing the surface of the condenser coil
4
Duct - electrical - and mechanical

15. How do you calculate LRA?
400
Nitrogen with a small amount of refrigerant
RLA/FLA x 5
In parallel

16. How do you calculate LRA?
Over 800 degrees F
RLA/FLA x 5
With 4' saddles
Positive

17. How is the high pressure switch wired with the low pressure switch?
Indoor fan motor - outdoor fan motor - and the compressor
20 A
In parallel
100 psig

18. The fan switch opens at what temperature?
105 degrees F
45-55%
4
Average feet per minute X area in square feet (H' x W'/144)

19. How many amps can 12 g wire handle?
It will have a decrease in superheat
Shorted winding - open winding - and grounded winding
Below 800 degrees F
20 A

20. What do you do after you braze a system?
Pull a vacuum
300
Inches of water column (in. WC)
It also rises

21. How many amps can 8 g wire handle?
Yes
40 A
High
RLA/FLA x 5

22. 10 SEER is classified as what kind of efficiency?
A band 4 inches or more in width
TXV
Standard
S-clips and drives (cleats)

23. At what temperature will brazing melt?
Over 800 degrees F
18 gauge
Subtract ambient temperature from 100
Duct with insulation on the inside

24. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
Fiberglass
8
Suction

25. How do you calculate the area of a circle?
20 degrees above ambient
Vapor
Heat load
Pi x radius squared

26. How long should you leave a system off once you kill power before restarting it?
Vapor
S-clips and drives (cleats)
True
2 minutes

27. Pressure in ductwork is measured In what?
Dehydrated with caps on each end
Inches of water column (in. WC)
4
25-ft or 50-ft

28. 6' round duct has a ballpark cfm of what?
8-12 degrees F
RLA/FLA x 5
Before the vent
100

29. If the suction pressure rises - what happens to the head pressure?
Pi x radius squared
With a minimum of three evenly spaced self-tapping screws
30 A
It also rises

30. How do you achieve high-efficiency?
When it is a pull-through evaporator
Nitrogen with a small amount of refrigerant
By increasing the surface of the condenser coil
Common

31. Where do you install a trap on a drain line?
Nitrogen with a small amount of refrigerant
40 A
Before the vent
On the common terminal

32. How will too much refrigerant effect superheat?
It will be low
45 degrees F
When it is a pull-through evaporator
Indoor fan motor - outdoor fan motor - and the compressor

33. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Outside diameter (OD)
With 4' saddles
Average feet per minute X area in square feet (H' x W'/144)
ACR (air-conditioning refrigeration) tubing

34. Do you need a trap on a push-through evaporator?
No
RLA/FLA x 5
Yes
Inside diameter (ID)

35. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
45 degrees F
In parallel
Suction

36. 8' round duct has a ballpark cfm of what?
Dehydrated with caps on each end
Subtract ambient temperature from 100
200
RLA/FLA x 5

37. The evaporator is designed to remove what two types of heat?
Suction
L-type
Latent and sensible
With an are rating

38. What gauge is thermostat wire?
It rises
18 gauge
Yes
Indoor fan motor - outdoor fan motor - and the compressor

39. How many cfm per ton?
Yes
Yes
Before the vent
400

40. Where do you apply flux when soldering?
Indoor fan motor - outdoor fan motor - and the compressor
Outside of the male fitting
True
15% silphos

41. What is the difference between SEER and EER?
105 degrees F
True
SEER includes the energy used in the start-up and shut-down cycles
A dirty evaporator

42. The A/C size is calculated by what?
8
45-55%
Heat load
Belt drive and direct drive

43. Where do you apply flux when soldering?
30 degrees F
Outside of the male fitting
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Duct with insulation on the inside

44. The load on the evaporater will effect which pressure?
Pull a vacuum
Yes
Blended refrigerants
Suction

45. What component changes refrigerant from a low pressure gas to a high pressure gas?
40 degrees F
Compressor
Belt drive and direct drive
SEER includes the energy used in the start-up and shut-down cycles

46. How are the condenser coils different on a high-efficiency unit?
They are larger
40 degrees F
200
A diffuser

47. How do you calculate cfm?

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48. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
The takeoff fitting
Heat loss
Outside of the male fitting

49. Will a dirty condenser cause a rise or fall in pressure?
Rise
With an are rating
They are physically larger
Pistons

50. Why are some ACR tubing lines insulated?
300
150
30 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line