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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. What are the two types of blower drives?
1/4'
Standard
Belt drive and direct drive
30-35 degrees above ambient

2. How do you calculate EER?
The takeoff fitting
Blended refrigerants
Btu/hr (output) / wattage (input)
Indoor fan motor - outdoor fan motor - and the compressor

3. What are the two basic duct connection configurations for package units supply and return air ducts?
Rise
Over/under and side by side
In parallel
Fiberglass

4. What is a package unit?
Nitrogen with a small amount of refrigerant
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Yes
40 A

5. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
A piston type metering device
150
It will have a decrease in superheat
200

6. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
It will be low
Slugging
12000

7. Do you need a vent on a pull-through evaporator?
45-55%
15% silphos
20 A
Yes

8. Why are some ACR tubing lines insulated?
12000
Pi x radius squared
Blended refrigerants
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

9. Does a package unit come from the factory pre-charged?
TXV
30 degrees F
Yes
15 A

10. On what terminal do you check amperage?
Common
ACR (air-conditioning refrigeration) tubing
It will have a decrease in superheat
Outside of the male fitting

11. Do you need a vent on a pull-through evaporator?
Belt drive and direct drive
Yes
40 degrees F
40 degrees F

12. 13 SEER is classified as what kind of efficiency?
High
Rise
Suction
40 A

13. How is flexible duct supported?
100
When it is above a conditioned space
By increasing the surface of the condenser coil
A band 4 inches or more in width

14. Do you need a trap on a push-through evaporator?
150
No
140 degrees F
Duct with insulation on the inside

15. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
40 A
20 A
L-type
Individual return air systems and central return air systems

16. If pressure rises - what happens to the superheat?
It rises
8
True
In parallel

17. 6' round duct has a ballpark cfm of what?
It also rises
Negative
Yes
100

18. If the rpm's are 750 - how many poles does the motor have?
20 degrees above ambient
8
Average feet per minute X area in square feet (H' x W'/144)
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

19. What are the three crafts normally associated with an air-conditioned installation?
18 gauge
Rise
Negative
Duct - electrical - and mechanical

20. When do you install an auxillary drain pan?
When it is above a conditioned space
Slugging
100 psig
5 degrees

21. At what temperature will soft solder melt?
A diffuser
Below 800 degrees F
300
Yes

22. When do you install an auxillary drain pan?
They are physically larger
Inclined manometer
Boil the liquid refrigerant out ot the oil within the crankcase
When it is above a conditioned space

23. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
Duct with insulation on the inside
False
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

24. What are the two functions of the air-conditioning system?
They are physically larger
To remove humidity and lower dry bulb temperature
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
No

25. What sort of pressure will a pull-through evaporator have?
Negative
2
When it is a pull-through evaporator
True

26. How many amps can 8 g wire handle?
40 A
ACR (air-conditioning refrigeration) tubing
40 degrees F
Below 800 degrees F

27. How is the high pressure switch wired with the low pressure switch?
In parallel
140 degrees F
The suction line or the low-pressure side
Outside of the male fitting

28. What is used to measure static air pressure in ducts.
Duct - electrical - and mechanical
150
Inclined manometer
30 degrees F

29. Can refrigerant line sets be altered in length?
150
SEER includes the energy used in the start-up and shut-down cycles
Over/under and side by side
Yes

30. How is insulation around a duct rated?
A swaging tool
With an are rating
Shorted winding - open winding - and grounded winding
A diffuser

31. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
Staples and tape
Static pressure - velocity pressure - and total pressure
Common

32. The evaporator is designed to remove what two types of heat?
It rises
Latent and sensible
The suction line or the low-pressure side
2

33. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Stranded
5 degrees
They are physically larger

34. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Stranded
In series
It will be low
20 A

35. Which is more efficient - a TXV or a fixed-orifice metering device?
A dirty evaporator
TXV
Slugging
8-12 degrees F

36. A reciprocating compressor has what sort of moving parts?
1/4'
Pistons
It will be high
The takeoff fitting

37. What are the two basic duct connection configurations for package units supply and return air ducts?
Duct with insulation on the inside
Belt drive and direct drive
Over/under and side by side
In series

38. 13 SEER is classified as what kind of efficiency?
High
A band 4 inches or more in width
They are larger
The suction line or the low-pressure side

39. The compressor is cooled by liquid refrigerant. (True of False)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
False
4
To lower the amount of pressure drop through the coil

40. The fan switch opens at what temperature?
Average feet per minute X area in square feet (H' x W'/144)
25-ft or 50-ft
105 degrees F
L-type

41. What are the two types of blower drives?
Belt drive and direct drive
They are physically larger
High
By increasing the surface of the condenser coil

42. How many cfm per ton?
400
Yes
15% silphos
5 degrees

43. 8' round duct has a ballpark cfm of what?
140 degrees F
Positive
200
Duct with insulation on the inside

44. The evaporator is designed to remove what two types of heat?
400
By increasing the surface of the condenser coil
When it is a pull-through evaporator
Latent and sensible

45. When do you install a trap on a drain line?
To lower the amount of pressure drop through the coil
When it is a pull-through evaporator
To remove humidity and lower dry bulb temperature
A swaging tool

46. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Belt drive and direct drive
ACR (air-conditioning refrigeration) tubing
Yes
False

47. In what state is the refrigerant in the compressor?
To lower the amount of pressure drop through the coil
Vapor
Heat load
Slugging

48. In what length rolls is soft copper tubing normally available?
False
30-35 degrees above ambient
25-ft or 50-ft
When it is a pull-through evaporator

49. What are the three ways a motor can fail electrically?
40 A
15 A
Shorted winding - open winding - and grounded winding
20 degrees above ambient

50. How does ACR copper pipe come?
15% silphos
45-55%
300
Dehydrated with caps on each end

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Residential Air Conditioning

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