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Residential Air Conditioning

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. How is flexible duct supported?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pi x radius squared
A band 4 inches or more in width
Yes

2. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
A piston type metering device
6
Stranded

3. 6' round duct has a ballpark cfm of what?
Inches of water column (in. WC)
100
400
A bypass duct or a dump zone

4. How do you calculate the area of a circle?
TXV
20 A
Suction
Pi x radius squared

5. How will too much refrigerant effect superheat?
A piston type metering device
Compressor
It will be low
Outside diameter (OD)

6. If pressure rises - what happens to the superheat?
It rises
2
When it is a pull-through evaporator
True

7. What are the two types of return air systems in residential installations?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Shorted winding - open winding - and grounded winding
Individual return air systems and central return air systems
Infiltration and ventilation

8. If the rpm's are 3450 - how many poles does the motor have?
Static pressure - velocity pressure - and total pressure
Fiberglass
2
TXV

9. What distributes supply air to a room in a structure?
Btu/hr (output) / wattage (input)
RLA/FLA x 5
A diffuser
30-35 degrees above ambient

10. How is ACR tubing sized?
Outside diameter (OD)
With 4' saddles
Outside of the male fitting
Common

11. The furnace size is calculated by what?
Heat loss
A piston type metering device
8
Dehydrated with caps on each end

12. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
The suction line or the low-pressure side
400
It will be low

13. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
With 4' saddles
Over/under and side by side
20 degrees F
High

14. Do you need a vent on a pull-through evaporator?
A band 4 inches or more in width
Suction
Yes
30 A

15. How many amps can 10 g wire handle?
No
30 A
It will have a decrease in superheat
Duct with insulation on the inside

16. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
Potential relay and start capacitor
Belt drive and direct drive
2 minutes

17. At what temperature does refrigerant condense in a high-efficiency unit?
Belt drive and direct drive
To remove humidity and lower dry bulb temperature
20 degrees above ambient
Individual return air systems and central return air systems

18. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Stranded
With an are rating
Yes

19. What kind of copper tubing is used for plumbing and heating applications?
No
The takeoff fitting
Nominal-sized tubing
Suction

20. How do you calculate cfm?

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21. Where do you apply flux when soldering?
150
Infiltration and ventilation
L-type
Outside of the male fitting

22. How is insulation around a duct rated?
With an are rating
20 degrees F
Belt drive and direct drive
105 degrees F

23. How do you calculate cfm?

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24. At what temperature will soft solder melt?
Suction
Vapor
Below 800 degrees F
Heat loss

25. Can refrigerant line sets be altered in length?
Btu/hr (output) / wattage (input)
Potential relay and start capacitor
Yes
Latent and sensible

26. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Blended refrigerants
45-55%
With 4' saddles
Yes

27. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
30 A
Slugging
L-type

28. What is the name of the fitting where the branch line leaves the duct?
S-clips and drives (cleats)
The takeoff fitting
The suction line or the low-pressure side
Fiberglass

29. If the rpm's are 750 - how many poles does the motor have?
Latent and sensible
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
8
It also rises

30. The furnace size is calculated by what?
When the system is under pressure
100 psig
40 degrees F
Heat loss

31. What kind of refrigeratnts must be added in liquid form?
Yes
They are larger
Blended refrigerants
Slugging

32. What are the two types of package units?
ACR (air-conditioning refrigeration) tubing
Side-by-side and over-and-under
It will have a decrease in superheat
45 degrees F

33. What percentage silver do you need to use for an are-410 system?
15% silphos
Positive
45 degrees F
Shorted winding - open winding - and grounded winding

34. How are round ducts supported?

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35. How long should you leave a system off once you kill power before restarting it?
Blended refrigerants
A band 4 inches or more in width
Static pressure - velocity pressure - and total pressure
2 minutes

36. What are the three major power-consuming devices on an air-conditioning system?
Boil the liquid refrigerant out ot the oil within the crankcase
Indoor fan motor - outdoor fan motor - and the compressor
TXV
Outside diameter (OD)

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

38. How do you calculate EER?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Btu/hr (output) / wattage (input)
Boil the liquid refrigerant out ot the oil within the crankcase
Subtract ambient temperature from 100

39. Which type of wire can handle a higher ampacity?
8-12 degrees F
On the common terminal
Stranded
Dehydrated with caps on each end

40. What are normal conditions - as defined by the ARI.
Infiltration and ventilation
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
RLA/FLA x 5
Nitrogen with a small amount of refrigerant

41. Do you need a trap on a pull-through evaporator?
Yes
Pistons
Outside diameter (OD)
Side-by-side and over-and-under

42. How many BTU's per ton?
12000
It also rises
40 A
A piston type metering device

43. What are the components of a hard-start kit?
45 degrees F
150
Potential relay and start capacitor
Heat loss

44. 9' round duct has a ballpark cfm of what?
300
4
Indoor fan motor - outdoor fan motor - and the compressor
It rises

45. What are the components of a hard-start kit?
Potential relay and start capacitor
Blended refrigerants
A diffuser
5 degrees

46. Do you need a vent on a push-through evaporator?
105 degrees F
Yes
Nominal-sized tubing
Duct with insulation on the inside

47. Does a package unit come from the factory pre-charged?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
Pi x radius squared
TXV

48. How many amps can 10 g wire handle?
30 A
Common
Standard
Btu/hr (output) / wattage (input)

49. What do you do after you braze a system?
15 A
Pull a vacuum
15% silphos
25-ft or 50-ft

50. What sort of pressure will a pull-through evaporator have?
The suction line or the low-pressure side
A swaging tool
Any amount
Negative