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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. What tool is used to expand the diameter of soft copper tubing
Pistons
A dirty evaporator
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
A swaging tool

2. How many amps can 12 g wire handle?
20 A
Potential relay and start capacitor
150
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

3. What can cause a decrease in suction pressure on an air-conditioning system?
20 degrees F
Subtract ambient temperature from 100
A dirty evaporator
Potential relay and start capacitor

4. Which type of wire can handle a higher ampacity?
In series
A dirty evaporator
Stranded
They are physically larger

5. How will too much refrigerant effect subcooling?
It will be high
Fiberglass
20 degrees above ambient
SEER includes the energy used in the start-up and shut-down cycles

6. Superheat should never be below how many degrees
S-clips and drives (cleats)
40 degrees F
400
5 degrees

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

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8. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
RLA/FLA x 5
2 minutes
Rise

9. How do you calculate LRA?
Over/under and side by side
Side-by-side and over-and-under
RLA/FLA x 5
Vapor

10. 6' round duct has a ballpark cfm of what?
L-type
Any amount
100
Positive

11. What kind of metering device do high-efficiency units usually use?
25-ft or 50-ft
25-ft or 50-ft
It will have a decrease in superheat
TXV

12. Do you need a trap on a pull-through evaporator?
Outside diameter (OD)
Yes
5 degrees
Staples and tape

13. How are the condenser coils different on a high-efficiency unit?
Side-by-side and over-and-under
They are larger
False
Over/under and side by side

14. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Nitrogen with a small amount of refrigerant
Below 800 degrees F
It will have a decrease in superheat
The suction line or the low-pressure side

15. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Common
12000
ACR (air-conditioning refrigeration) tubing
Pull a vacuum

16. 7' round duct has a ballpark cfm of what?
150
40 degrees F
Nitrogen with a small amount of refrigerant
1/4'

17. How many amps can 14 g wire handle?
Infiltration and ventilation
15 A
SEER includes the energy used in the start-up and shut-down cycles
12000

18. How is nominal-sized tubing sized?
TXV
With 4' saddles
Individual return air systems and central return air systems
Inside diameter (ID)

19. When do you install a trap on a drain line?
Potential relay and start capacitor
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When it is a pull-through evaporator
200

20. How is nominal-sized tubing sized?
Infiltration and ventilation
Inside diameter (ID)
30 degrees F
100

21. Where do you apply flux when soldering?
400
Pistons
400
Outside of the male fitting

22. What is the typical pressure differance across a TXV?
Nominal-sized tubing
100 psig
Yes
L-type

23. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Inclined manometer
45-55%
No

24. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Yes
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Duct with insulation on the inside

25. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
20 A
A swaging tool
8-12 degrees F
They are physically larger

26. What is it called when liquid refrigerant gets into the compressor?
Boil the liquid refrigerant out ot the oil within the crankcase
Rise
Slugging
True

27. How do you calculate cfm?

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28. How many amps can 8 g wire handle?
40 A
SEER includes the energy used in the start-up and shut-down cycles
SEER includes the energy used in the start-up and shut-down cycles
Stranded

29. The fan switch opens at what temperature?
12000
Negative
105 degrees F
20 A

30. At what temperature does refrigerant condense in a high-efficiency unit?
True
No
20 degrees above ambient
Blended refrigerants

31. Pressure in ductwork is measured In what?
Individual return air systems and central return air systems
Nitrogen with a small amount of refrigerant
Inches of water column (in. WC)
30 degrees F

32. What are normal conditions - as defined by the ARI.
To remove humidity and lower dry bulb temperature
With 4' saddles
Btu/hr (output) / wattage (input)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

33. A reciprocating compressor has what sort of moving parts?
Pi x radius squared
Negative
Pistons
Pull a vacuum

34. What are the three crafts normally associated with an air-conditioned installation?
When it is a pull-through evaporator
Duct - electrical - and mechanical
They are physically larger
The takeoff fitting

35. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
100 psig
20 A
Suction

36. On what terminal do you check amperage?
18 gauge
200
Common
40 degrees F

37. Why are some ACR tubing lines insulated?
100
S-clips and drives (cleats)
Vapor
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

38. Where do you install a trap on a drain line?
Before the vent
Positive
Potential relay and start capacitor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

39. How many cfm per ton?
400
False
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
When the system is under pressure

40. 10' round duct has a ballpark cfm of what?
Latent and sensible
Standard
400
Suction

41. How many cfm per ton?
20 degrees above ambient
105 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
400

42. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
Standard
With an are rating
6

43. Which is more efficient - a TXV or a fixed-orifice metering device?
The suction line or the low-pressure side
Shorted winding - open winding - and grounded winding
TXV
Duct with insulation on the inside

44. The compressor is cooled by liquid refrigerant. (True of False)
False
20 degrees above ambient
In parallel
Compressor

45. What kind of copper tubing is used for refrigeration or air-conditioning applications?
15% silphos
Common
Yes
ACR (air-conditioning refrigeration) tubing

46. 8' round duct has a ballpark cfm of what?
2
200
Heat loss
4

47. Do you need a vent on a pull-through evaporator?
Yes
It rises
Latent and sensible
With an are rating

48. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
With 4' saddles
Any amount
It will be low
20 degrees F

49. At what temperature will brazing melt?
Over 800 degrees F
In series
High
Common

50. Superheat should never be below how many degrees
30 A
Yes
5 degrees
When it is a pull-through evaporator