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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. In what length rolls is soft copper tubing normally available?
20 A
Inside diameter (ID)
No
25-ft or 50-ft

2. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Pull a vacuum
Shorted winding - open winding - and grounded winding
A piston type metering device

3. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Yes
40 degrees F
It also rises
Blended refrigerants

4. How are the condenser coils different on a high-efficiency unit?
They are larger
L-type
Indoor fan motor - outdoor fan motor - and the compressor
Below 800 degrees F

5. 6' round duct has a ballpark cfm of what?
200
It will be low
Rise
100

6. How will too much refrigerant effect subcooling?
Outside of the male fitting
20 A
It will be high
With an are rating

7. What tool is used to expand the diameter of soft copper tubing
15% silphos
Vapor
Individual return air systems and central return air systems
A swaging tool

8. How is nominal-sized tubing sized?
Below 800 degrees F
Inside diameter (ID)
30 degrees F
400

9. What distributes supply air to a room in a structure?
A diffuser
Inches of water column (in. WC)
40 degrees F
15 A

10. Where do you apply flux when soldering?
Outside of the male fitting
Infiltration and ventilation
Heat loss
Outside diameter (OD)

11. Which type of wire can handle a higher ampacity?
Staples and tape
Stranded
15% silphos
In parallel

12. What gauge is thermostat wire?
Individual return air systems and central return air systems
Duct with insulation on the inside
18 gauge
It will be low

13. What are the two types of return air systems in residential installations?
45 degrees F
105 degrees F
140 degrees F
Individual return air systems and central return air systems

14. 10' round duct has a ballpark cfm of what?
S-clips and drives (cleats)
Fiberglass
400
Static pressure - velocity pressure - and total pressure

15. The fan switch closes at what temperature?
Yes
By increasing the surface of the condenser coil
Potential relay and start capacitor
140 degrees F

16. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
SEER includes the energy used in the start-up and shut-down cycles
True
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
12000

17. What kind of copper tubing is used for plumbing and heating applications?
Over/under and side by side
6
Nominal-sized tubing
SEER includes the energy used in the start-up and shut-down cycles

18. How is flexible duct supported?
A band 4 inches or more in width
Indoor fan motor - outdoor fan motor - and the compressor
18 gauge
True

19. What are the two types of package units?
Negative
Side-by-side and over-and-under
45-55%
8

20. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
True
20 degrees F
Btu/hr (output) / wattage (input)
Inside diameter (ID)

21. If the rpm's are 3450 - how many poles does the motor have?
2
ACR (air-conditioning refrigeration) tubing
1/4'
They are larger

22. 10 SEER is classified as what kind of efficiency?
Average feet per minute X area in square feet (H' x W'/144)
True
Standard
Over 800 degrees F

23. If the rpm's are 1050 - how many poles does the motor have?
Subtract ambient temperature from 100
6
The suction line or the low-pressure side
40 degrees F

24. What is it called when liquid refrigerant gets into the compressor?
Slugging
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
In series
Yes

25. What are the three major power-consuming devices on an air-conditioning system?
Average feet per minute X area in square feet (H' x W'/144)
Indoor fan motor - outdoor fan motor - and the compressor
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Rise

26. What do you use to connect square and rectangular ductboard together?
Below 800 degrees F
Potential relay and start capacitor
Rise
S-clips and drives (cleats)

27. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
In series
With an are rating
Compressor

28. What are normal conditions - as defined by the ARI.
15 A
Inches of water column (in. WC)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Potential relay and start capacitor

29. How will too much refrigerant effect subcooling?
Pistons
L-type
Negative
It will be high

30. What can cause a decrease in suction pressure on an air-conditioning system?
20 A
Btu/hr (output) / wattage (input)
A dirty evaporator
Pistons

31. Where do you apply flux when soldering?
Outside of the male fitting
Over/under and side by side
With 4' saddles
Belt drive and direct drive

32. Sections of duct board can be fastened together with what?
Yes
Staples and tape
Inside diameter (ID)
20 degrees above ambient

33. What distributes supply air to a room in a structure?
Dehydrated with caps on each end
A diffuser
Inches of water column (in. WC)
Heat load

34. If the rpm's are 750 - how many poles does the motor have?
8
Below 800 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
The takeoff fitting

35. How many BTU's per ton?
Compressor
Inches of water column (in. WC)
12000
4

36. What type of air conditioning system must be charged using the superheat method?
Vapor
4
A piston type metering device
200

37. How does ACR copper pipe come?
Dehydrated with caps on each end
In parallel
Vapor
Suction

38. Do you need a trap on a pull-through evaporator?
Yes
In series
Compressor
40 degrees F

39. In what state is the refrigerant in the compressor?
150
A dirty evaporator
A swaging tool
Vapor

40. What are the two basic duct connection configurations for package units supply and return air ducts?
They are physically larger
100 psig
Over/under and side by side
100 psig

41. If the suction pressure rises - what happens to the head pressure?
True
Belt drive and direct drive
20 A
It also rises

42. How are round ducts supported?

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43. On what terminal do you check amperage?
100 psig
400
Common
TXV

44. How do you calculate cfm?

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45. Can refrigerant line sets be altered in length?
Yes
Over 800 degrees F
Duct with insulation on the inside
Static pressure - velocity pressure - and total pressure

46. What is lined duct?
They are larger
Static pressure - velocity pressure - and total pressure
Duct with insulation on the inside
Side-by-side and over-and-under

47. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
Potential relay and start capacitor
40 degrees F
40 degrees F

48. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
S-clips and drives (cleats)
With 4' saddles
Btu/hr (output) / wattage (input)
L-type

49. If pressure rises - what happens to the superheat?
Stranded
It rises
When it is above a conditioned space
A bypass duct or a dump zone

50. If the rpm's are 1050 - how many poles does the motor have?
20 degrees F
6
Yes
100 psig