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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.
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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. If pressure rises - what happens to the superheat?
Indoor fan motor - outdoor fan motor - and the compressor
100 psig
It rises
A dirty evaporator

2. At what temperature does refrigerant condense in a standard-efficiency unit?
Suction
30-35 degrees above ambient
On the common terminal
Btu/hr (output) / wattage (input)

3. What are the three crafts normally associated with an air-conditioned installation?
Pull a vacuum
Duct - electrical - and mechanical
On the common terminal
Positive

4. What is the range for normal superheat and subcooling?
Outside of the male fitting
8-12 degrees F
15% silphos
Yes

5. How many amps can 10 g wire handle?
Duct with insulation on the inside
Any amount
30 A
Inside diameter (ID)

6. What do you use to check for leaks?
Pistons
True
In parallel
Nitrogen with a small amount of refrigerant

7. At what temperature does refrigerant condense in a standard-efficiency unit?
To lower the amount of pressure drop through the coil
40 degrees F
30-35 degrees above ambient
Yes

8. In what state is the refrigerant in the compressor?
Vapor
Pistons
Common
Yes

9. What tool is used to expand the diameter of soft copper tubing
The takeoff fitting
Dehydrated with caps on each end
A swaging tool
Yes

10. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
S-clips and drives (cleats)
Inside diameter (ID)
Inclined manometer

11. Most duct insulation is made of what?
L-type
No
Fiberglass
Inclined manometer

12. What is the range for normal superheat and subcooling?
400
Potential relay and start capacitor
8-12 degrees F
To remove humidity and lower dry bulb temperature

13. What is it called when liquid refrigerant gets into the compressor?
5 degrees
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Rise
Slugging

14. At what temperature will brazing melt?
True
Over 800 degrees F
Below 800 degrees F
The takeoff fitting

15. The furnace size is calculated by what?
Heat loss
Boil the liquid refrigerant out ot the oil within the crankcase
Yes
25-ft or 50-ft

16. How many BTU's per ton?
300
400
140 degrees F
12000

17. Where is insulation used on copper tubing used for air-conditioning?
Pi x radius squared
8
The suction line or the low-pressure side
They are physically larger

18. 10 SEER is classified as what kind of efficiency?
Standard
Nominal-sized tubing
400
RLA/FLA x 5

19. What do you use to connect square and rectangular ductboard together?
100 psig
S-clips and drives (cleats)
40 degrees F
Yes

20. If the rpm's are 1750 - how many poles does the motor have?
Slugging
4
1/4'
A swaging tool

21. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
2 minutes
Potential relay and start capacitor
400

22. The fan switch opens at what temperature?
Positive
False
105 degrees F
2

23. What do you do after you braze a system?
Pull a vacuum
With a minimum of three evenly spaced self-tapping screws
Indoor fan motor - outdoor fan motor - and the compressor
L-type

24. Can refrigerant line sets be altered in length?
When the system is under pressure
Yes
A band 4 inches or more in width
With an are rating

25. How many amps can 10 g wire handle?
Any amount
4
L-type
30 A

26. Where do you apply flux when soldering?
30 A
Outside of the male fitting
In parallel
Outside diameter (OD)

27. Why are some ACR tubing lines insulated?
Staples and tape
200
Before the vent
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

28. How is flexible duct supported?
A band 4 inches or more in width
8
Pistons
Blended refrigerants

29. What kind of metering device do high-efficiency units usually use?
8-12 degrees F
TXV
On the common terminal
No

30. What is the difference between SEER and EER?
Over 800 degrees F
True
SEER includes the energy used in the start-up and shut-down cycles
Positive

31. When must a copper joint never be soldered or brazed?
In parallel
When the system is under pressure
Yes
300

32. Which type of wire can handle a higher ampacity?
Stranded
Indoor fan motor - outdoor fan motor - and the compressor
True
Potential relay and start capacitor

33. At what temperature will brazing melt?
Pi x radius squared
Heat loss
Over 800 degrees F
The takeoff fitting

34. How do you calculate LRA?
In parallel
45-55%
RLA/FLA x 5
Positive

35. How do you calculate cfm?

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36. Do you need a trap on a pull-through evaporator?
Nominal-sized tubing
Yes
5 degrees
A band 4 inches or more in width

37. Do you need a vent on a pull-through evaporator?
Yes
True
Below 800 degrees F
A band 4 inches or more in width

38. Do you need a trap on a push-through evaporator?
20 A
No
Shorted winding - open winding - and grounded winding
False

39. What do you do after you braze a system?
Pull a vacuum
8-12 degrees F
By increasing the surface of the condenser coil
TXV

40. Do you need a vent on a pull-through evaporator?
Btu/hr (output) / wattage (input)
300
200
Yes

41. If the rpm's are 750 - how many poles does the motor have?
8
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Static pressure - velocity pressure - and total pressure
Slugging

42. What tool is used to expand the diameter of soft copper tubing
A swaging tool
S-clips and drives (cleats)
140 degrees F
It also rises

43. 9' round duct has a ballpark cfm of what?
A swaging tool
300
It also rises
Rise

44. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Before the vent
L-type
Pull a vacuum
Side-by-side and over-and-under

45. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Any amount
TXV
The takeoff fitting
ACR (air-conditioning refrigeration) tubing

46. In what state is the refrigerant in the compressor?
True
SEER includes the energy used in the start-up and shut-down cycles
Vapor
300

47. 10' round duct has a ballpark cfm of what?
40 A
They are larger
Potential relay and start capacitor
400

48. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Pull a vacuum
Pistons
They are physically larger
With 4' saddles

49. What is used to measure static air pressure in ducts.
40 A
In series
Inclined manometer
Infiltration and ventilation

50. Where do you install a trap on a drain line?
Before the vent
Static pressure - velocity pressure - and total pressure
Heat loss
Over 800 degrees F

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Residential Air Conditioning

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