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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. Sections of duct board can be fastened together with what?
Staples and tape
Duct with insulation on the inside
Nominal-sized tubing
150

2. When do you install an auxillary drain pan?
When it is above a conditioned space
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Side-by-side and over-and-under
RLA/FLA x 5

3. 13 SEER is classified as what kind of efficiency?
Duct - electrical - and mechanical
20 degrees above ambient
High
20 degrees F

4. What is the name of the fitting where the branch line leaves the duct?
With an are rating
100
40 A
The takeoff fitting

5. What are the components of a hard-start kit?
Potential relay and start capacitor
On the common terminal
Duct with insulation on the inside
Average feet per minute X area in square feet (H' x W'/144)

6. What are the two types of blower drives?
Shorted winding - open winding - and grounded winding
Belt drive and direct drive
In parallel
Boil the liquid refrigerant out ot the oil within the crankcase

7. If the rpm's are 1050 - how many poles does the motor have?
Over 800 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
6
18 gauge

8. Do you need a trap on a push-through evaporator?
No
Positive
105 degrees F
25-ft or 50-ft

9. What are the two types of return air systems in residential installations?
High
Individual return air systems and central return air systems
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Duct - electrical - and mechanical

10. The evaporator is designed to remove what two types of heat?
Below 800 degrees F
Latent and sensible
It will have a decrease in superheat
In parallel

11. What tool is used to expand the diameter of soft copper tubing
15% silphos
A swaging tool
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
The suction line or the low-pressure side

12. How is insulation around a duct rated?
A bypass duct or a dump zone
A piston type metering device
With an are rating
When it is a pull-through evaporator

13. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Before the vent
20 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
A swaging tool

14. What type of air conditioning system must be charged using the superheat method?
Heat loss
2 minutes
A band 4 inches or more in width
A piston type metering device

15. What is it called when liquid refrigerant gets into the compressor?
Side-by-side and over-and-under
Slugging
40 degrees F
A bypass duct or a dump zone

16. 9' round duct has a ballpark cfm of what?
40 degrees F
300
A band 4 inches or more in width
Slugging

17. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
A band 4 inches or more in width
A piston type metering device
Any amount

18. How many amps can 14 g wire handle?
Pull a vacuum
They are larger
To remove humidity and lower dry bulb temperature
15 A

19. Do you need a vent on a pull-through evaporator?
Yes
Compressor
Boil the liquid refrigerant out ot the oil within the crankcase
40 degrees F

20. In what length rolls is soft copper tubing normally available?
Inclined manometer
25-ft or 50-ft
400
In parallel

21. 6' round duct has a ballpark cfm of what?
100
Heat loss
It will be high
Dehydrated with caps on each end

22. What tool is used to expand the diameter of soft copper tubing
150
Negative
A swaging tool
40 A

23. What is lined duct?
By increasing the surface of the condenser coil
False
Duct with insulation on the inside
Latent and sensible

24. What do you use to check for leaks?
By increasing the surface of the condenser coil
Nitrogen with a small amount of refrigerant
20 degrees F
Shorted winding - open winding - and grounded winding

25. At what temperature does refrigerant condense in a standard-efficiency unit?
To remove humidity and lower dry bulb temperature
30-35 degrees above ambient
S-clips and drives (cleats)
Common

26. The crankcase heater on an air-conditioning compressor is used to what?
Potential relay and start capacitor
Duct with insulation on the inside
To lower the amount of pressure drop through the coil
Boil the liquid refrigerant out ot the oil within the crankcase

27. 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
105 degrees F
Inside diameter (ID)

28. What do you use to check for leaks?
Over 800 degrees F
Dehydrated with caps on each end
With an are rating
Nitrogen with a small amount of refrigerant

29. Do you need a vent on a push-through evaporator?
25-ft or 50-ft
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Yes
140 degrees F

30. Superheat should never be below how many degrees
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Dehydrated with caps on each end
40 A
5 degrees

31. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
High
A bypass duct or a dump zone
Heat loss
Positive

32. What is the normal evaporator temperature?
45 degrees F
Inches of water column (in. WC)
A swaging tool
Heat loss

33. The fan switch closes at what temperature?
100
140 degrees F
Dehydrated with caps on each end
A diffuser

34. 10' round duct has a ballpark cfm of what?
400
Suction
12000
6

35. Which is more efficient - a TXV or a fixed-orifice metering device?
Any amount
High
It rises
TXV

36. How will too much refrigerant effect superheat?
Dehydrated with caps on each end
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Compressor
It will be low

37. How does ACR copper pipe come?
Heat load
Yes
Dehydrated with caps on each end
Shorted winding - open winding - and grounded winding

38. 9' round duct has a ballpark cfm of what?
300
Pi x radius squared
Pistons
A swaging tool

39. The fan switch opens at what temperature?
Dehydrated with caps on each end
Side-by-side and over-and-under
15% silphos
105 degrees F

40. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
When it is a pull-through evaporator
A bypass duct or a dump zone
Nitrogen with a small amount of refrigerant
Belt drive and direct drive

41. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
It rises
A band 4 inches or more in width
On the common terminal

42. Pressure in ductwork is measured In what?
A swaging tool
Indoor fan motor - outdoor fan motor - and the compressor
Inches of water column (in. WC)
1/4'

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

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44. What are the two types of package units?
With a minimum of three evenly spaced self-tapping screws
Side-by-side and over-and-under
They are larger
The takeoff fitting

45. What kind of copper tubing is used for refrigeration or air-conditioning applications?
The suction line or the low-pressure side
ACR (air-conditioning refrigeration) tubing
Outside diameter (OD)
15% silphos

46. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
8-12 degrees F
12000
1/4'
True

47. How many amps can 10 g wire handle?
S-clips and drives (cleats)
20 degrees above ambient
30 A
5 degrees

48. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
Blended refrigerants
Standard
Pistons

49. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
30 degrees F
Stranded
When it is a pull-through evaporator

50. How will too much refrigerant effect subcooling?
It will be high
TXV
Yes
Pistons

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Residential Air Conditioning

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