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Residential Air Conditioning

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. How much does a drain line need to drop per foot of length?

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2. 10 SEER is classified as what kind of efficiency?
Nitrogen with a small amount of refrigerant
TXV
Standard
Yes

3. If pressure rises - what happens to the superheat?
Standard
It rises
Below 800 degrees F
Yes

4. What are the components of a hard-start kit?
Potential relay and start capacitor
Inclined manometer
Common
Latent and sensible

5. What are normal conditions - as defined by the ARI.
Before the vent
Static pressure - velocity pressure - and total pressure
Subtract ambient temperature from 100
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

6. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
15% silphos
By increasing the surface of the condenser coil

7. How is the high pressure switch wired with the low pressure switch?
True
A dirty evaporator
Inside diameter (ID)
In parallel

8. At what temperature does refrigerant condense in a standard-efficiency unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
40 degrees F
On the common terminal
30-35 degrees above ambient

9. What sort of pressure will a push-through evaporator have?
Positive
Yes
Infiltration and ventilation
Yes

10. What is the normal evaporator temperature?
45 degrees F
Positive
In parallel
A dirty evaporator

11. What tool is used to expand the diameter of soft copper tubing
To lower the amount of pressure drop through the coil
A swaging tool
6
140 degrees F

12. Do you need a vent on a push-through evaporator?
40 degrees F
Yes
Side-by-side and over-and-under
To remove humidity and lower dry bulb temperature

13. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Boil the liquid refrigerant out ot the oil within the crankcase
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
ACR (air-conditioning refrigeration) tubing
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

14. How is insulation around a duct rated?
With an are rating
The suction line or the low-pressure side
It rises
45-55%

15. Superheat should never be below how many degrees
400
150
Vapor
5 degrees

16. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Dehydrated with caps on each end
8
Any amount
No

17. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
A dirty evaporator
Potential relay and start capacitor
Compressor

18. How long should you leave a system off once you kill power before restarting it?
2 minutes
Side-by-side and over-and-under
Subtract ambient temperature from 100
In parallel

19. The fan switch closes at what temperature?
Infiltration and ventilation
140 degrees F
With an are rating
It rises

20. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Outside of the male fitting
Before the vent
Before the vent

21. In what state is the refrigerant in the compressor?
ACR (air-conditioning refrigeration) tubing
Vapor
Dehydrated with caps on each end
Side-by-side and over-and-under

22. The A/C size is calculated by what?
Pull a vacuum
It will be low
Heat load
L-type

23. If the rpm's are 750 - how many poles does the motor have?
Yes
8
True
SEER includes the energy used in the start-up and shut-down cycles

24. What percentage silver do you need to use for an are-410 system?
TXV
In series
15% silphos
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

25. What are the four materials used to make duct?
They are physically larger
Inclined manometer
400
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

26. What do you use to connect square and rectangular ductboard together?
Before the vent
S-clips and drives (cleats)
A piston type metering device
Btu/hr (output) / wattage (input)

27. What is considered normal operating conditions?
High
8-12 degrees F
Stranded
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

28. What are the two types of return air systems in residential installations?
A diffuser
8
Individual return air systems and central return air systems
2

29. What component changes refrigerant from a low pressure gas to a high pressure gas?
Stranded
Heat load
8-12 degrees F
Compressor

30. What are the two basic duct connection configurations for package units supply and return air ducts?
Common
Over/under and side by side
Inches of water column (in. WC)
Pi x radius squared

31. Pressure in ductwork is measured In what?
Yes
150
It will be low
Inches of water column (in. WC)

32. If pressure rises - what happens to the superheat?
A swaging tool
It rises
Boil the liquid refrigerant out ot the oil within the crankcase
A dirty evaporator

33. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Slugging
Rise
15 A

34. What is it called when liquid refrigerant gets into the compressor?
Slugging
2
Btu/hr (output) / wattage (input)
40 A

35. The A/C size is calculated by what?
Positive
Suction
On the common terminal
Heat load

36. How do you achieve high-efficiency?
Inside diameter (ID)
By increasing the surface of the condenser coil
A dirty evaporator
Heat load

37. What sort of pressure will a pull-through evaporator have?
Negative
Pi x radius squared
1/4'
Side-by-side and over-and-under

38. How many BTU's per ton?
30 A
A piston type metering device
12000
15% silphos

39. 7' round duct has a ballpark cfm of what?
ACR (air-conditioning refrigeration) tubing
Nitrogen with a small amount of refrigerant
150
It will have a decrease in superheat

40. The fan switch opens at what temperature?
S-clips and drives (cleats)
Pi x radius squared
105 degrees F
Outside of the male fitting

41. Where do you apply flux when soldering?
Outside of the male fitting
105 degrees F
A piston type metering device
TXV

42. How do you calculate the area of a circle?
Compressor
100 psig
Pi x radius squared
When it is above a conditioned space

43. If the rpm's are 1050 - how many poles does the motor have?
400
Compressor
In parallel
6

44. What gauge is thermostat wire?
18 gauge
Btu/hr (output) / wattage (input)
Stranded
45-55%

45. What do you do after you braze a system?
The takeoff fitting
Belt drive and direct drive
Side-by-side and over-and-under
Pull a vacuum

46. What is the name of the fitting where the branch line leaves the duct?
Boil the liquid refrigerant out ot the oil within the crankcase
The takeoff fitting
TXV
Blended refrigerants

47. How are round ducts connected to one another?
1/4'
140 degrees F
15 A
With a minimum of three evenly spaced self-tapping screws

48. The evaporator is designed to remove what two types of heat?
105 degrees F
Latent and sensible
With an are rating
Dehydrated with caps on each end

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

50. How will too much refrigerant effect subcooling?
When it is a pull-through evaporator
It will be high
Yes
TXV

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Residential Air Conditioning

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