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Residential Air Conditioning

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. Do you need a vent on a pull-through evaporator?
Yes
A diffuser
400
1/4'

2. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Duct - electrical - and mechanical
45-55%
Latent and sensible
TXV

3. When do you install an auxillary drain pan?
When it is above a conditioned space
25-ft or 50-ft
A band 4 inches or more in width
Stranded

4. Do you need a trap on a pull-through evaporator?
Yes
20 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
30-35 degrees above ambient

5. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
A swaging tool
140 degrees F
Yes

6. The A/C size is calculated by what?
Stranded
Heat load
Duct - electrical - and mechanical
Yes

7. The fan switch opens at what temperature?
140 degrees F
105 degrees F
15% silphos
With a minimum of three evenly spaced self-tapping screws

8. How is insulation around a duct rated?
A diffuser
15 A
18 gauge
With an are rating

9. How many amps can 12 g wire handle?
Inches of water column (in. WC)
ACR (air-conditioning refrigeration) tubing
45-55%
20 A

10. What kind of copper tubing is used for plumbing and heating applications?
Btu/hr (output) / wattage (input)
With a minimum of three evenly spaced self-tapping screws
300
Nominal-sized tubing

11. The compressor is cooled by liquid refrigerant. (True of False)
False
400
S-clips and drives (cleats)
40 A

12. Which is more efficient - a TXV or a fixed-orifice metering device?
Potential relay and start capacitor
Compressor
2 minutes
TXV

13. What are the two basic duct connection configurations for package units supply and return air ducts?
L-type
1/4'
A bypass duct or a dump zone
Over/under and side by side

14. When do you install a trap on a drain line?
30-35 degrees above ambient
With an are rating
When it is a pull-through evaporator
8

15. What are normal conditions - as defined by the ARI.
Pull a vacuum
Suction
The suction line or the low-pressure side
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

16. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
Over 800 degrees F
Any amount
Static pressure - velocity pressure - and total pressure

17. What are the four materials used to make duct?
Outside of the male fitting
150
Heat load
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

18. What is the range for normal superheat and subcooling?
SEER includes the energy used in the start-up and shut-down cycles
With 4' saddles
8-12 degrees F
The takeoff fitting

19. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It rises
45-55%
With a minimum of three evenly spaced self-tapping screws
It will have a decrease in superheat

20. What is used to measure static air pressure in ducts.
Inclined manometer
Dehydrated with caps on each end
Slugging
No

21. Pressure in ductwork is measured In what?
Pull a vacuum
With 4' saddles
Inches of water column (in. WC)
With an are rating

22. 6' round duct has a ballpark cfm of what?
100
15 A
200
RLA/FLA x 5

23. What are the two types of blower drives?
20 degrees above ambient
ACR (air-conditioning refrigeration) tubing
TXV
Belt drive and direct drive

24. Do you need a vent on a push-through evaporator?
2
Yes
Common
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

25. What is lined duct?
45-55%
Duct with insulation on the inside
Outside diameter (OD)
Stranded

26. What is used to measure static air pressure in ducts.
TXV
Over/under and side by side
Inclined manometer
105 degrees F

27. What sort of pressure will a pull-through evaporator have?
400
Negative
15% silphos
Infiltration and ventilation

28. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Shorted winding - open winding - and grounded winding
105 degrees F
With an are rating
40 degrees F

29. At what temperature will brazing melt?
Inclined manometer
Yes
Over 800 degrees F
It will be high

30. How many amps can 8 g wire handle?
30 degrees F
Inches of water column (in. WC)
Any amount
40 A

31. Where do you apply flux when soldering?
Outside of the male fitting
A diffuser
With 4' saddles
ACR (air-conditioning refrigeration) tubing

32. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
High
30 degrees F
Pistons

33. What is the difference between SEER and EER?
When the system is under pressure
SEER includes the energy used in the start-up and shut-down cycles
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It will be low

34. If pressure rises - what happens to the superheat?
S-clips and drives (cleats)
ACR (air-conditioning refrigeration) tubing
It rises
1/4'

35. Which type of wire can handle a higher ampacity?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Stranded
A diffuser
It also rises

36. The fan switch closes at what temperature?
105 degrees F
30 A
TXV
140 degrees F

37. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
100 psig
A band 4 inches or more in width
Nitrogen with a small amount of refrigerant

38. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Slugging
RLA/FLA x 5
A piston type metering device
To lower the amount of pressure drop through the coil

39. Do you need a vent on a push-through evaporator?
Pi x radius squared
TXV
Yes
In series

40. What sort of pressure will a push-through evaporator have?
20 degrees above ambient
Positive
On the common terminal
Nitrogen with a small amount of refrigerant

41. When must a copper joint never be soldered or brazed?
Pi x radius squared
When the system is under pressure
Nitrogen with a small amount of refrigerant
8-12 degrees F

42. How many amps can 10 g wire handle?
Duct - electrical - and mechanical
30 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
15 A

43. How are round ducts supported?

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44. 13 SEER is classified as what kind of efficiency?
100 psig
High
Dehydrated with caps on each end
Heat load

45. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
A bypass duct or a dump zone
45-55%
With a minimum of three evenly spaced self-tapping screws
Any amount

46. What are the two types of blower drives?
Positive
Slugging
Belt drive and direct drive
When the system is under pressure

47. Where do you check the amps on a motor?
RLA/FLA x 5
It also rises
On the common terminal
Dehydrated with caps on each end

48. Superheat should never be below how many degrees
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
5 degrees
200
It rises

49. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
False
In series
Below 800 degrees F
Nominal-sized tubing

50. What distributes supply air to a room in a structure?
Dehydrated with caps on each end
A diffuser
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Inches of water column (in. WC)

Can you answer 50 questions in 15 minutes?

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Residential Air Conditioning

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