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

2. Where is insulation used on copper tubing used for air-conditioning?
TXV
Indoor fan motor - outdoor fan motor - and the compressor
The suction line or the low-pressure side
It also rises

3. At what temperature will soft solder melt?
The suction line or the low-pressure side
With a minimum of three evenly spaced self-tapping screws
Below 800 degrees F
Inside diameter (ID)

4. What do you do after you braze a system?
Boil the liquid refrigerant out ot the oil within the crankcase
ACR (air-conditioning refrigeration) tubing
A piston type metering device
Pull a vacuum

5. Sections of duct board can be fastened together with what?
When it is a pull-through evaporator
Staples and tape
Over 800 degrees F
20 degrees F

6. What is the design boiling point for most evaporator coils in residential air conditioning?
Dehydrated with caps on each end
Static pressure - velocity pressure - and total pressure
Yes
40 degrees F

7. How is insulation around a duct rated?
Outside of the male fitting
400
Belt drive and direct drive
With an are rating

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

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9. How do you calculate EER?
150
40 degrees F
SEER includes the energy used in the start-up and shut-down cycles
Btu/hr (output) / wattage (input)

10. If the suction pressure rises - what happens to the head pressure?
Blended refrigerants
No
It also rises
It will be high

11. How is the high pressure switch wired with the low pressure switch?
In parallel
Suction
2
Outside diameter (OD)

12. How is flexible duct supported?
The suction line or the low-pressure side
A band 4 inches or more in width
150
Below 800 degrees F

13. The furnace size is calculated by what?
Staples and tape
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When the system is under pressure
Heat loss

14. 8' round duct has a ballpark cfm of what?
200
False
Vapor
The takeoff fitting

15. At what temperature will brazing melt?
It will be high
Over 800 degrees F
To remove humidity and lower dry bulb temperature
Yes

16. Where do you check the amps on a motor?
140 degrees F
On the common terminal
25-ft or 50-ft
In series

17. How many amps can 14 g wire handle?
15 A
Outside of the male fitting
Yes
Subtract ambient temperature from 100

18. If pressure rises - what happens to the superheat?
High
When it is above a conditioned space
It rises
20 degrees above ambient

19. Do you need a trap on a push-through evaporator?
L-type
No
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
ACR (air-conditioning refrigeration) tubing

20. Does a package unit come from the factory pre-charged?
20 A
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
TXV
Yes

21. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
8
Yes
In parallel

22. On what terminal do you check amperage?
Common
8
5 degrees
2

23. Most duct insulation is made of what?
Fiberglass
Yes
Inclined manometer
Individual return air systems and central return air systems

24. The fan switch closes at what temperature?
Positive
45-55%
Compressor
140 degrees F

25. What sort of pressure will a pull-through evaporator have?
Negative
4
With an are rating
On the common terminal

26. How long should you leave a system off once you kill power before restarting it?
Indoor fan motor - outdoor fan motor - and the compressor
2 minutes
Staples and tape
It will be low

27. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
Duct - electrical - and mechanical
With 4' saddles
100

28. What is used to measure static air pressure in ducts.
105 degrees F
Compressor
Inclined manometer
Infiltration and ventilation

29. What sort of pressure will a pull-through evaporator have?
Yes
Negative
45-55%
Heat load

30. How does ACR copper pipe come?
TXV
High
Dehydrated with caps on each end
Slugging

31. The compressor is cooled by liquid refrigerant. (True of False)
45-55%
Inside diameter (ID)
False
400

32. What do you use to check for leaks?
Side-by-side and over-and-under
Outside diameter (OD)
L-type
Nitrogen with a small amount of refrigerant

33. What is a package unit?
TXV
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
140 degrees F
Indoor fan motor - outdoor fan motor - and the compressor

34. Do you need a trap on a pull-through evaporator?
On the common terminal
Yes
A bypass duct or a dump zone
20 A

35. When must a copper joint never be soldered or brazed?
The takeoff fitting
15% silphos
Duct - electrical - and mechanical
When the system is under pressure

36. What are the two basic duct connection configurations for package units supply and return air ducts?
Pull a vacuum
High
Over/under and side by side
Subtract ambient temperature from 100

37. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
A swaging tool
Any amount
SEER includes the energy used in the start-up and shut-down cycles
30 degrees F

38. If the rpm's are 750 - how many poles does the motor have?
5 degrees
8
Yes
SEER includes the energy used in the start-up and shut-down cycles

39. How do you calculate cfm?

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40. 7' round duct has a ballpark cfm of what?
8
150
Pistons
Infiltration and ventilation

41. A reciprocating compressor has what sort of moving parts?
They are larger
30 A
Pistons
It also rises

42. 6' round duct has a ballpark cfm of what?
Yes
100
105 degrees F
Below 800 degrees F

43. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Inside diameter (ID)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
45-55%
With an are rating

44. Which is more efficient - a TXV or a fixed-orifice metering device?
A dirty evaporator
With a minimum of three evenly spaced self-tapping screws
TXV
Individual return air systems and central return air systems

45. If the rpm's are 1750 - how many poles does the motor have?
Duct - electrical - and mechanical
100 psig
4
With 4' saddles

46. What is lined duct?
When it is above a conditioned space
Duct with insulation on the inside
40 degrees F
Compressor

47. The load on the evaporater will effect which pressure?
A piston type metering device
18 gauge
On the common terminal
Suction

48. What percentage silver do you need to use for an are-410 system?
15% silphos
With a minimum of three evenly spaced self-tapping screws
40 degrees F
12000

49. How many amps can 8 g wire handle?
100
40 A
When it is above a conditioned space
Yes

50. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
20 A
Nominal-sized tubing
Latent and sensible