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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.
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 are the three major power-consuming devices on an air-conditioning system?
Static pressure - velocity pressure - and total pressure
Pi x radius squared
Outside of the male fitting
Indoor fan motor - outdoor fan motor - and the compressor

2. Why are some ACR tubing lines insulated?
It will be low
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
SEER includes the energy used in the start-up and shut-down cycles
A diffuser

3. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
L-type
2 minutes
Nominal-sized tubing
30 degrees F

4. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
150
The takeoff fitting
To lower the amount of pressure drop through the coil
Over/under and side by side

5. How do you calculate ballpark superheat?
L-type
In parallel
Yes
Subtract ambient temperature from 100

6. What are the two types of blower drives?
Belt drive and direct drive
Over 800 degrees F
25-ft or 50-ft
Inside diameter (ID)

7. How are the condenser coils different on a high-efficiency unit?
Slugging
It will be low
They are larger
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

8. How are round ducts supported?

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9. How many amps can 10 g wire handle?
Infiltration and ventilation
30 A
Duct with insulation on the inside
Latent and sensible

10. What are the two basic duct connection configurations for package units supply and return air ducts?
To remove humidity and lower dry bulb temperature
Over/under and side by side
Staples and tape
TXV

11. What percentage silver do you need to use for an are-410 system?
To lower the amount of pressure drop through the coil
Standard
The takeoff fitting
15% silphos

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

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13. Which type of wire can handle a higher ampacity?
8-12 degrees F
A diffuser
Stranded
20 degrees F

14. Where do you install a trap on a drain line?
Common
Duct with insulation on the inside
Pull a vacuum
Before the vent

15. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Boil the liquid refrigerant out ot the oil within the crankcase
With an are rating
Average feet per minute X area in square feet (H' x W'/144)

16. 9' round duct has a ballpark cfm of what?
TXV
300
RLA/FLA x 5
Belt drive and direct drive

17. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
S-clips and drives (cleats)
A bypass duct or a dump zone
45-55%
With 4' saddles

18. 10 SEER is classified as what kind of efficiency?
200
Standard
A dirty evaporator
A dirty evaporator

19. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Outside of the male fitting
25-ft or 50-ft

20. What distributes supply air to a room in a structure?
A diffuser
Nominal-sized tubing
Pistons
6

21. What is it called when liquid refrigerant gets into the compressor?
Any amount
Nitrogen with a small amount of refrigerant
Slugging
With 4' saddles

22. The furnace size is calculated by what?
A dirty evaporator
Heat loss
105 degrees F
With an are rating

23. The fan switch opens at what temperature?
In series
105 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A piston type metering device

24. What is the design boiling point for most evaporator coils in residential air conditioning?
Before the vent
40 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Side-by-side and over-and-under

25. What kind of refrigeratnts must be added in liquid form?
Outside of the male fitting
RLA/FLA x 5
Blended refrigerants
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

26. The load on the evaporater will effect which pressure?
400
Suction
Inclined manometer
It rises

27. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Outside diameter (OD)
False
Individual return air systems and central return air systems
They are physically larger

28. What are the three crafts normally associated with an air-conditioned installation?
2 minutes
Vapor
400
Duct - electrical - and mechanical

29. What are the two types of return air systems in residential installations?
Pistons
Suction
Individual return air systems and central return air systems
A diffuser

30. How many amps can 8 g wire handle?
TXV
40 A
8-12 degrees F
30 degrees F

31. How do you calculate the area of a circle?
Yes
With a minimum of three evenly spaced self-tapping screws
Pi x radius squared
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

32. How many cfm per ton?
20 degrees above ambient
200
400
Dehydrated with caps on each end

33. Most duct insulation is made of what?
SEER includes the energy used in the start-up and shut-down cycles
Fiberglass
15 A
In parallel

34. How is ACR tubing sized?
They are larger
150
Outside diameter (OD)
20 degrees F

35. What tool is used to expand the diameter of soft copper tubing
Yes
12000
40 degrees F
A swaging tool

36. When do you install an auxillary drain pan?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Dehydrated with caps on each end
When it is above a conditioned space
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

37. What sort of pressure will a pull-through evaporator have?
Negative
Dehydrated with caps on each end
4
Heat loss

38. What is the range for normal superheat and subcooling?
8-12 degrees F
45 degrees F
With a minimum of three evenly spaced self-tapping screws
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

39. What type of air conditioning system must be charged using the superheat method?
Subtract ambient temperature from 100
A piston type metering device
To lower the amount of pressure drop through the coil
Yes

40. What are the two types of package units?
Rise
30-35 degrees above ambient
8-12 degrees F
Side-by-side and over-and-under

41. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Pull a vacuum
30 degrees F
Yes
30-35 degrees above ambient

42. 8' round duct has a ballpark cfm of what?
Positive
Subtract ambient temperature from 100
15 A
200

43. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
Yes
Static pressure - velocity pressure - and total pressure
Yes

44. Why are some ACR tubing lines insulated?
Positive
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Average feet per minute X area in square feet (H' x W'/144)

45. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Nitrogen with a small amount of refrigerant
5 degrees
In series
It will be low

46. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
40 A
Common
A bypass duct or a dump zone
They are physically larger

47. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
25-ft or 50-ft
Outside diameter (OD)
Duct - electrical - and mechanical

48. What is the normal evaporator temperature?
Staples and tape
45 degrees F
To remove humidity and lower dry bulb temperature
Fiberglass

49. What is used to measure static air pressure in ducts.
30 A
Indoor fan motor - outdoor fan motor - and the compressor
Inclined manometer
Common

50. What kind of copper tubing is used for refrigeration or air-conditioning applications?
20 A
Indoor fan motor - outdoor fan motor - and the compressor
Static pressure - velocity pressure - and total pressure
ACR (air-conditioning refrigeration) tubing