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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 is it called when liquid refrigerant gets into the compressor?
Slugging
Staples and tape
Individual return air systems and central return air systems
30 degrees F

2. How many amps can 8 g wire handle?
In series
It also rises
Vapor
40 A

3. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Blended refrigerants
To lower the amount of pressure drop through the coil
25-ft or 50-ft
Yes

4. What are the two types of return air systems in residential installations?
To lower the amount of pressure drop through the coil
In parallel
Individual return air systems and central return air systems
A bypass duct or a dump zone

5. At what temperature will soft solder melt?
Below 800 degrees F
Inches of water column (in. WC)
200
100 psig

6. What tool is used to expand the diameter of soft copper tubing
A swaging tool
On the common terminal
False
They are physically larger

7. How will too much refrigerant effect superheat?
RLA/FLA x 5
It will be low
Inches of water column (in. WC)
Vapor

8. Superheat should never be below how many degrees
Potential relay and start capacitor
They are physically larger
5 degrees
8-12 degrees F

9. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
30 A
When it is a pull-through evaporator
150

10. If the rpm's are 1750 - how many poles does the motor have?
200
No
4
140 degrees F

11. What are the two ways that fresh air enters a structure?
They are larger
Infiltration and ventilation
Heat load
15 A

12. How do you calculate LRA?
Yes
Pi x radius squared
RLA/FLA x 5
18 gauge

13. What type of air conditioning system must be charged using the superheat method?
RLA/FLA x 5
30-35 degrees above ambient
A piston type metering device
Slugging

14. What percentage silver do you need to use for an are-410 system?
Yes
15% silphos
8-12 degrees F
Individual return air systems and central return air systems

15. Will a dirty condenser cause a rise or fall in pressure?
A dirty evaporator
TXV
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Rise

16. How do you calculate cfm?

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17. The fan switch closes at what temperature?
S-clips and drives (cleats)
To remove humidity and lower dry bulb temperature
140 degrees F
Yes

18. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
The takeoff fitting
A band 4 inches or more in width
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

19. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Duct - electrical - and mechanical
Outside of the male fitting
30 degrees F
To remove humidity and lower dry bulb temperature

20. Does a package unit come from the factory pre-charged?
Over 800 degrees F
Yes
4
Outside diameter (OD)

21. Superheat should never be below how many degrees
5 degrees
Rise
It will be low
2

22. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
Average feet per minute X area in square feet (H' x W'/144)
Side-by-side and over-and-under
They are larger

23. 10 SEER is classified as what kind of efficiency?
30 A
L-type
Standard
1/4'

24. Where do you check the amps on a motor?
High
RLA/FLA x 5
Heat load
On the common terminal

25. How is the high pressure switch wired with the low pressure switch?
Nitrogen with a small amount of refrigerant
Dehydrated with caps on each end
In parallel
40 A

26. How is flexible duct supported?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
200
A band 4 inches or more in width
Heat load

27. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
True
Average feet per minute X area in square feet (H' x W'/144)
Positive

28. What do you do after you braze a system?
When it is a pull-through evaporator
Pull a vacuum
Pistons
8-12 degrees F

29. What kind of refrigeratnts must be added in liquid form?
Latent and sensible
40 A
300
Blended refrigerants

30. How are round ducts connected to one another?
Pi x radius squared
With a minimum of three evenly spaced self-tapping screws
TXV
It will be low

31. If the suction pressure rises - what happens to the head pressure?
Fiberglass
Yes
It also rises
45-55%

32. When do you install an auxillary drain pan?
Suction
Rise
When it is above a conditioned space
30 A

33. When do you install an auxillary drain pan?
Fiberglass
When it is above a conditioned space
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Belt drive and direct drive

34. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
45-55%
8
Negative

35. What distributes supply air to a room in a structure?
S-clips and drives (cleats)
A diffuser
2
It also rises

36. What sort of pressure will a pull-through evaporator have?
Over 800 degrees F
Yes
Negative
The takeoff fitting

37. When do you install a trap on a drain line?
On the common terminal
40 A
When it is a pull-through evaporator
30 degrees F

38. On what terminal do you check amperage?
40 degrees F
Common
300
15 A

39. What sort of pressure will a pull-through evaporator have?
Negative
30-35 degrees above ambient
When it is a pull-through evaporator
To lower the amount of pressure drop through the coil

40. 7' round duct has a ballpark cfm of what?
105 degrees F
150
On the common terminal
Negative

41. Can refrigerant line sets be altered in length?
ACR (air-conditioning refrigeration) tubing
Yes
Yes
With an are rating

42. Do you need a trap on a pull-through evaporator?
It also rises
Yes
A diffuser
Nominal-sized tubing

43. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Yes
TXV
Any amount
Heat loss

44. How is insulation around a duct rated?
With an are rating
Pistons
Outside diameter (OD)
Pi x radius squared

45. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
In parallel
30 degrees F
100

46. Sections of duct board can be fastened together with what?
Boil the liquid refrigerant out ot the oil within the crankcase
100
Staples and tape
Duct - electrical - and mechanical

47. Do you need a trap on a push-through evaporator?
No
30 degrees F
A swaging tool
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

48. The evaporator is designed to remove what two types of heat?
Latent and sensible
Below 800 degrees F
Outside of the male fitting
By increasing the surface of the condenser coil

49. How do you calculate the area of a circle?
Yes
40 A
Yes
Pi x radius squared

50. What is considered normal operating conditions?
20 A
Any amount
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws