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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. 10' round duct has a ballpark cfm of what?
Vapor
Slugging
400
6

2. What kind of metering device do high-efficiency units usually use?
A diffuser
No
1/4'
TXV

3. Pressure in ductwork is measured In what?
Pi x radius squared
Fiberglass
Btu/hr (output) / wattage (input)
Inches of water column (in. WC)

4. What kind of refrigeratnts must be added in liquid form?
Below 800 degrees F
Blended refrigerants
25-ft or 50-ft
40 A

5. What kind of copper tubing is used for refrigeration or air-conditioning applications?
The suction line or the low-pressure side
Static pressure - velocity pressure - and total pressure
ACR (air-conditioning refrigeration) tubing
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

6. The A/C size is calculated by what?
Heat load
Slugging
When the system is under pressure
Negative

7. How do you calculate ballpark superheat?
18 gauge
Subtract ambient temperature from 100
Dehydrated with caps on each end
Suction

8. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
S-clips and drives (cleats)
Boil the liquid refrigerant out ot the oil within the crankcase
Subtract ambient temperature from 100

9. In what state is the refrigerant in the compressor?
A band 4 inches or more in width
Heat load
Stranded
Vapor

10. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
400
It will be low
Yes

11. What are the two types of blower drives?
30-35 degrees above ambient
Outside diameter (OD)
Yes
Belt drive and direct drive

12. How is the high pressure switch wired with the low pressure switch?
In parallel
A band 4 inches or more in width
Average feet per minute X area in square feet (H' x W'/144)
False

13. Do you need a vent on a pull-through evaporator?
2 minutes
In parallel
True
Yes

14. Most duct insulation is made of what?
ACR (air-conditioning refrigeration) tubing
It rises
Fiberglass
Btu/hr (output) / wattage (input)

15. Do you need a vent on a push-through evaporator?
Any amount
30 A
Yes
A swaging tool

16. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Infiltration and ventilation
25-ft or 50-ft
20 degrees F
Duct - electrical - and mechanical

17. What are normal conditions - as defined by the ARI.
100 psig
L-type
When it is a pull-through evaporator
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

18. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
A diffuser
RLA/FLA x 5
When it is above a conditioned space
45-55%

19. Where is insulation used on copper tubing used for air-conditioning?
Outside of the male fitting
5 degrees
TXV
The suction line or the low-pressure side

20. How does ACR copper pipe come?
45-55%
8
Dehydrated with caps on each end
20 A

21. How do you calculate cfm?

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22. Which is more efficient - a TXV or a fixed-orifice metering device?
400
TXV
Pull a vacuum
No

23. 9' round duct has a ballpark cfm of what?
It will be high
300
45-55%
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

24. How are the condenser coils different on a high-efficiency unit?
Individual return air systems and central return air systems
105 degrees F
Individual return air systems and central return air systems
They are larger

25. Do you need a trap on a pull-through evaporator?
Positive
Subtract ambient temperature from 100
25-ft or 50-ft
Yes

26. 13 SEER is classified as what kind of efficiency?
High
Nominal-sized tubing
Potential relay and start capacitor
30-35 degrees above ambient

27. What are the components of a hard-start kit?
The takeoff fitting
Outside diameter (OD)
ACR (air-conditioning refrigeration) tubing
Potential relay and start capacitor

28. What are the two functions of the air-conditioning system?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Heat load
The takeoff fitting
To remove humidity and lower dry bulb temperature

29. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees F
Shorted winding - open winding - and grounded winding
20 degrees above ambient
Vapor

30. 7' round duct has a ballpark cfm of what?
150
Rise
40 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase

31. Superheat should never be below how many degrees
Duct with insulation on the inside
5 degrees
Yes
18 gauge

32. What component changes refrigerant from a low pressure gas to a high pressure gas?
18 gauge
Compressor
40 degrees F
Over 800 degrees F

33. How do you achieve high-efficiency?
Pi x radius squared
Pull a vacuum
By increasing the surface of the condenser coil
Infiltration and ventilation

34. What is the typical pressure differance across a TXV?
100 psig
Vapor
Indoor fan motor - outdoor fan motor - and the compressor
Side-by-side and over-and-under

35. What are the two types of return air systems in residential installations?
4
It rises
45-55%
Individual return air systems and central return air systems

36. If the rpm's are 1750 - how many poles does the motor have?
4
Yes
False
Boil the liquid refrigerant out ot the oil within the crankcase

37. At what temperature will soft solder melt?
Fiberglass
Below 800 degrees F
Heat load
Positive

38. What are the three major power-consuming devices on an air-conditioning system?
Pull a vacuum
Indoor fan motor - outdoor fan motor - and the compressor
40 A
A dirty evaporator

39. Where do you apply flux when soldering?
Static pressure - velocity pressure - and total pressure
Outside of the male fitting
40 A
S-clips and drives (cleats)

40. At what temperature will brazing melt?
8-12 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
2 minutes
Over 800 degrees F

41. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Shorted winding - open winding - and grounded winding
The suction line or the low-pressure side
30 degrees F
300

42. How are round ducts supported?

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43. 13 SEER is classified as what kind of efficiency?
A swaging tool
Duct with insulation on the inside
High
Dehydrated with caps on each end

44. 6' round duct has a ballpark cfm of what?
100
A band 4 inches or more in width
Inside diameter (ID)
Dehydrated with caps on each end

45. The evaporator is designed to remove what two types of heat?
Over 800 degrees F
When it is a pull-through evaporator
20 degrees above ambient
Latent and sensible

46. Do you need a trap on a push-through evaporator?
400
No
Duct - electrical - and mechanical
8

47. How many amps can 12 g wire handle?
Infiltration and ventilation
20 A
Rise
When the system is under pressure

48. Which type of wire can handle a higher ampacity?
Infiltration and ventilation
Any amount
Standard
Stranded

49. What is used to measure static air pressure in ducts.
A piston type metering device
20 degrees above ambient
Yes
Inclined manometer

50. What are the three crafts normally associated with an air-conditioned installation?
150
ACR (air-conditioning refrigeration) tubing
Duct - electrical - and mechanical
Subtract ambient temperature from 100