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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. Sections of duct board can be fastened together with what?
Inside diameter (ID)
Staples and tape
Duct - electrical - and mechanical
A dirty evaporator

2. Which is more efficient - a TXV or a fixed-orifice metering device?
200
Dehydrated with caps on each end
TXV
True

3. What is the range for normal superheat and subcooling?
20 degrees F
Average feet per minute X area in square feet (H' x W'/144)
8-12 degrees F
ACR (air-conditioning refrigeration) tubing

4. Pressure in ductwork is measured In what?
Heat load
400
Average feet per minute X area in square feet (H' x W'/144)
Inches of water column (in. WC)

5. How will too much refrigerant effect subcooling?
40 A
It will be high
2 minutes
Subtract ambient temperature from 100

6. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
S-clips and drives (cleats)
40 degrees F
Belt drive and direct drive
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

7. If the rpm's are 1050 - how many poles does the motor have?
Duct with insulation on the inside
6
TXV
200

8. What sort of pressure will a push-through evaporator have?
It rises
Static pressure - velocity pressure - and total pressure
A swaging tool
Positive

9. What do you use to connect square and rectangular ductboard together?
40 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Positive
S-clips and drives (cleats)

10. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
Staples and tape
Yes
Common

11. How are round ducts supported?

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12. How is insulation around a duct rated?
A dirty evaporator
With an are rating
A bypass duct or a dump zone
Negative

13. How are round ducts connected to one another?
Yes
45 degrees F
With a minimum of three evenly spaced self-tapping screws
Yes

14. What do you do after you braze a system?
140 degrees F
Pull a vacuum
High
Nitrogen with a small amount of refrigerant

15. How are round ducts connected to one another?
A piston type metering device
6
Suction
With a minimum of three evenly spaced self-tapping screws

16. Where do you apply flux when soldering?
Outside of the male fitting
400
40 degrees F
Slugging

17. 6' round duct has a ballpark cfm of what?
S-clips and drives (cleats)
Boil the liquid refrigerant out ot the oil within the crankcase
Over 800 degrees F
100

18. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
6
With an are rating
Yes

19. At what temperature will soft solder melt?
45 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
Nominal-sized tubing
Below 800 degrees F

20. How do you calculate the area of a circle?
L-type
40 degrees F
45 degrees F
Pi x radius squared

21. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Inches of water column (in. WC)
It will have a decrease in superheat
Individual return air systems and central return air systems
A bypass duct or a dump zone

22. What is the typical pressure differance across a TXV?
Yes
100 psig
30-35 degrees above ambient
Over/under and side by side

23. What distributes supply air to a room in a structure?
A dirty evaporator
The suction line or the low-pressure side
Outside of the male fitting
A diffuser

24. What do you do after you braze a system?
In series
Duct - electrical - and mechanical
They are larger
Pull a vacuum

25. How do you calculate cfm?

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26. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Positive
30 degrees F
100 psig
It will be high

27. 10' round duct has a ballpark cfm of what?
20 degrees above ambient
400
2 minutes
Pull a vacuum

28. 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)
Compressor
25-ft or 50-ft
Indoor fan motor - outdoor fan motor - and the compressor

29. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
30 degrees F
To remove humidity and lower dry bulb temperature
Pistons
20 degrees F

30. How do you calculate cfm?

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31. On what terminal do you check amperage?
Common
On the common terminal
15% silphos
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

32. What is the design boiling point for most evaporator coils in residential air conditioning?
100
It will be low
5 degrees
40 degrees F

33. What is the normal evaporator temperature?
40 degrees F
It also rises
45 degrees F
False

34. What is the name of the fitting where the branch line leaves the duct?
Rise
When the system is under pressure
The takeoff fitting
True

35. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
Yes
They are larger
Individual return air systems and central return air systems

36. The load on the evaporater will effect which pressure?
Suction
18 gauge
30 A
Duct with insulation on the inside

37. What kind of refrigeratnts must be added in liquid form?
A dirty evaporator
It will be high
Blended refrigerants
SEER includes the energy used in the start-up and shut-down cycles

38. Which is more efficient - a TXV or a fixed-orifice metering device?
200
TXV
2
Pull a vacuum

39. What are the two basic duct connection configurations for package units supply and return air ducts?
400
400
Side-by-side and over-and-under
Over/under and side by side

40. What is it called when liquid refrigerant gets into the compressor?
40 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
20 A
Slugging

41. Where do you check the amps on a motor?
18 gauge
On the common terminal
A bypass duct or a dump zone
8

42. Where do you install a trap on a drain line?
Yes
Before the vent
The suction line or the low-pressure side
It will have a decrease in superheat

43. When do you install an auxillary drain pan?
When it is above a conditioned space
200
Inclined manometer
Common

44. Can refrigerant line sets be altered in length?
Inches of water column (in. WC)
A bypass duct or a dump zone
Yes
Fiberglass

45. Where do you check the amps on a motor?
Negative
Average feet per minute X area in square feet (H' x W'/144)
With an are rating
On the common terminal

46. Which type of wire can handle a higher ampacity?
Inches of water column (in. WC)
Stranded
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It will be high

47. The A/C size is calculated by what?
100 psig
25-ft or 50-ft
Suction
Heat load

48. What kind of refrigeratnts must be added in liquid form?
20 degrees F
Blended refrigerants
Side-by-side and over-and-under
Stranded

49. What type of air conditioning system must be charged using the superheat method?
6
A dirty evaporator
A piston type metering device
It will be low

50. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Inclined manometer
40 degrees F
With an are rating
Blended refrigerants