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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 sort of pressure will a push-through evaporator have?
Inside diameter (ID)
400
140 degrees F
Positive

2. 10 SEER is classified as what kind of efficiency?
ACR (air-conditioning refrigeration) tubing
20 degrees above ambient
Standard
Potential relay and start capacitor

3. What percentage silver do you need to use for an are-410 system?
High
4
6
15% silphos

4. Do you need a vent on a push-through evaporator?
Rise
Yes
Pull a vacuum
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

5. How many amps can 14 g wire handle?
18 gauge
15 A
2
It rises

6. If the rpm's are 1750 - how many poles does the motor have?
25-ft or 50-ft
4
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
S-clips and drives (cleats)

7. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Heat load
20 A
Heat loss

8. How do you calculate cfm?

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9. What do you use to connect square and rectangular ductboard together?
Side-by-side and over-and-under
A band 4 inches or more in width
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
S-clips and drives (cleats)

10. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
45-55%
They are larger
Pistons

11. Which type of wire can handle a higher ampacity?
Stranded
In series
2
30 A

12. How many cfm per ton?
Side-by-side and over-and-under
400
Belt drive and direct drive
Inside diameter (ID)

13. The furnace size is calculated by what?
A piston type metering device
30-35 degrees above ambient
Inclined manometer
Heat loss

14. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
S-clips and drives (cleats)
L-type
A bypass duct or a dump zone
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

15. If the rpm's are 1750 - how many poles does the motor have?
40 degrees F
4
Vapor
It will be high

16. The load on the evaporater will effect which pressure?
A swaging tool
Outside diameter (OD)
40 degrees F
Suction

17. What sort of pressure will a push-through evaporator have?
Positive
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
A band 4 inches or more in width
The suction line or the low-pressure side

18. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
It will be high
40 degrees F
4
Negative

19. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Outside of the male fitting
A dirty evaporator
150
ACR (air-conditioning refrigeration) tubing

20. What do you use to connect square and rectangular ductboard together?
With 4' saddles
Potential relay and start capacitor
Latent and sensible
S-clips and drives (cleats)

21. At what temperature will brazing melt?
High
A diffuser
Over 800 degrees F
The suction line or the low-pressure side

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

23. 8' round duct has a ballpark cfm of what?
200
8
Nitrogen with a small amount of refrigerant
No

24. If the rpm's are 3450 - how many poles does the motor have?
40 degrees F
6
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
2

25. Which type of wire can handle a higher ampacity?
Vapor
Latent and sensible
Stranded
300

26. What is it called when liquid refrigerant gets into the compressor?
Compressor
Outside of the male fitting
Heat load
Slugging

27. What are the two types of blower drives?
4
When the system is under pressure
Belt drive and direct drive
A swaging tool

28. How do you calculate ballpark superheat?
Yes
Subtract ambient temperature from 100
25-ft or 50-ft
To lower the amount of pressure drop through the coil

29. 9' round duct has a ballpark cfm of what?
5 degrees
By increasing the surface of the condenser coil
300
2

30. What are the two types of return air systems in residential installations?
A dirty evaporator
Individual return air systems and central return air systems
It rises
40 A

31. How many amps can 10 g wire handle?
300
By increasing the surface of the condenser coil
30 A
It will have a decrease in superheat

32. 10' round duct has a ballpark cfm of what?
200
S-clips and drives (cleats)
400
Static pressure - velocity pressure - and total pressure

33. Where do you apply flux when soldering?
Outside of the male fitting
Vapor
When the system is under pressure
Over 800 degrees F

34. How long should you leave a system off once you kill power before restarting it?
A bypass duct or a dump zone
High
RLA/FLA x 5
2 minutes

35. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
Before the vent
300
Dehydrated with caps on each end

36. How many BTU's per ton?
Boil the liquid refrigerant out ot the oil within the crankcase
When it is a pull-through evaporator
A dirty evaporator
12000

37. The A/C size is calculated by what?
Heat load
Latent and sensible
The takeoff fitting
ACR (air-conditioning refrigeration) tubing

38. 8' round duct has a ballpark cfm of what?
200
Heat loss
Heat loss
Yes

39. What are the two functions of the air-conditioning system?
Infiltration and ventilation
To remove humidity and lower dry bulb temperature
TXV
Outside of the male fitting

40. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
45-55%
When the system is under pressure
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

41. What is a package unit?
Yes
Over 800 degrees F
With a minimum of three evenly spaced self-tapping screws
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

42. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
When it is above a conditioned space
30 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
Positive

43. How are round ducts supported?

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44. What are normal conditions - as defined by the ARI.
45 degrees F
Inside diameter (ID)
2 minutes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

45. What component changes refrigerant from a low pressure gas to a high pressure gas?
A bypass duct or a dump zone
Compressor
Yes
Over/under and side by side

46. How are the condenser coils different on a high-efficiency unit?
To lower the amount of pressure drop through the coil
When it is a pull-through evaporator
30 degrees F
They are larger

47. At what temperature will soft solder melt?
105 degrees F
Below 800 degrees F
30 degrees F
45 degrees F

48. Do you need a trap on a push-through evaporator?
Yes
No
It rises
With an are rating

49. On what terminal do you check amperage?
Duct with insulation on the inside
Common
Indoor fan motor - outdoor fan motor - and the compressor
To lower the amount of pressure drop through the coil

50. If pressure rises - what happens to the superheat?
Before the vent
The takeoff fitting
It rises
15 A