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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?
25-ft or 50-ft
Positive
Vapor
Slugging

2. What is the difference between SEER and EER?
With 4' saddles
Standard
Suction
SEER includes the energy used in the start-up and shut-down cycles

3. Sections of duct board can be fastened together with what?
40 degrees F
When the system is under pressure
45-55%
Staples and tape

4. What is the name of the fitting where the branch line leaves the duct?
Duct - electrical - and mechanical
The takeoff fitting
When it is a pull-through evaporator
20 degrees F

5. 9' round duct has a ballpark cfm of what?
Staples and tape
Inclined manometer
Outside of the male fitting
300

6. How are round ducts connected to one another?
TXV
When the system is under pressure
Infiltration and ventilation
With a minimum of three evenly spaced self-tapping screws

7. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
It will be high
On the common terminal
30 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

8. At what temperature will soft solder melt?
It also rises
Below 800 degrees F
Pistons
Btu/hr (output) / wattage (input)

9. Do you need a trap on a pull-through evaporator?
They are physically larger
With a minimum of three evenly spaced self-tapping screws
Yes
105 degrees F

10. How much does a drain line need to drop per foot of length?

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11. What do you use to connect square and rectangular ductboard together?
Latent and sensible
6
S-clips and drives (cleats)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

12. How do you calculate LRA?
Yes
Duct with insulation on the inside
25-ft or 50-ft
RLA/FLA x 5

13. What kind of copper tubing is used for plumbing and heating applications?
Belt drive and direct drive
Nominal-sized tubing
With an are rating
30-35 degrees above ambient

14. What are the three pressures created by moving air in ductwork?
Indoor fan motor - outdoor fan motor - and the compressor
Static pressure - velocity pressure - and total pressure
Stranded
Individual return air systems and central return air systems

15. How do you calculate EER?
It will be high
Latent and sensible
Btu/hr (output) / wattage (input)
Negative

16. At what temperature will brazing melt?
It also rises
Outside diameter (OD)
Over 800 degrees F
In series

17. When do you install an auxillary drain pan?
400
With 4' saddles
Indoor fan motor - outdoor fan motor - and the compressor
When it is above a conditioned space

18. 7' round duct has a ballpark cfm of what?
A band 4 inches or more in width
Yes
150
Fiberglass

19. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pistons
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
30 A

20. On what terminal do you check amperage?
By increasing the surface of the condenser coil
4
25-ft or 50-ft
Common

21. What are the two types of package units?
300
TXV
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Side-by-side and over-and-under

22. What are the two types of blower drives?
Belt drive and direct drive
30 A
30 degrees F
TXV

23. In what state is the refrigerant in the compressor?
L-type
Vapor
The takeoff fitting
To lower the amount of pressure drop through the coil

24. How will too much refrigerant effect subcooling?
A swaging tool
400
It will be high
In parallel

25. What gauge is thermostat wire?
Pull a vacuum
A piston type metering device
18 gauge
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

26. How are round ducts supported?

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27. How will too much refrigerant effect subcooling?
100
It will be high
Outside of the male fitting
A swaging tool

28. What kind of refrigeratnts must be added in liquid form?
Shorted winding - open winding - and grounded winding
Blended refrigerants
Yes
Staples and tape

29. How many BTU's per ton?
12000
2
Vapor
Rise

30. What gauge is thermostat wire?
Inside diameter (ID)
18 gauge
5 degrees
30 degrees F

31. How many BTU's per ton?
The takeoff fitting
12000
40 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

32. What are the two types of package units?
Side-by-side and over-and-under
45-55%
100 psig
Over/under and side by side

33. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
With 4' saddles
A piston type metering device
A bypass duct or a dump zone
No

34. The A/C size is calculated by what?
Heat load
40 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Compressor

35. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A swaging tool
It also rises
TXV

36. How does ACR copper pipe come?
Dehydrated with caps on each end
Stranded
Outside of the male fitting
Pull a vacuum

37. Which is more efficient - a TXV or a fixed-orifice metering device?
Outside of the male fitting
Compressor
5 degrees
TXV

38. What are the three ways a motor can fail electrically?
Yes
Shorted winding - open winding - and grounded winding
Nitrogen with a small amount of refrigerant
With a minimum of three evenly spaced self-tapping screws

39. Where do you apply flux when soldering?
Average feet per minute X area in square feet (H' x W'/144)
Before the vent
Outside of the male fitting
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

40. Do you need a trap on a push-through evaporator?
TXV
Standard
No
8

41. At what temperature does refrigerant condense in a high-efficiency unit?
Rise
12000
Btu/hr (output) / wattage (input)
20 degrees above ambient

42. What is the normal evaporator temperature?
Duct - electrical - and mechanical
45 degrees F
1/4'
Inches of water column (in. WC)

43. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Nitrogen with a small amount of refrigerant
40 degrees F
Latent and sensible
Latent and sensible

44. The compressor is cooled by liquid refrigerant. (True of False)
With 4' saddles
Over 800 degrees F
False
Yes

45. When do you install a trap on a drain line?
When it is a pull-through evaporator
A diffuser
1/4'
It rises

46. 13 SEER is classified as what kind of efficiency?
High
Infiltration and ventilation
Nominal-sized tubing
Duct - electrical - and mechanical

47. What are the three major power-consuming devices on an air-conditioning system?
Over 800 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
ACR (air-conditioning refrigeration) tubing
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

48. If the rpm's are 1050 - how many poles does the motor have?
A dirty evaporator
Blended refrigerants
8
6

49. How many amps can 10 g wire handle?
Outside of the male fitting
Nitrogen with a small amount of refrigerant
300
30 A

50. How is nominal-sized tubing sized?
Inside diameter (ID)
20 degrees above ambient
When the system is under pressure
Shorted winding - open winding - and grounded winding