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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 is lined duct?
With a minimum of three evenly spaced self-tapping screws
In series
On the common terminal
Duct with insulation on the inside

2. When do you install an auxillary drain pan?
Negative
Latent and sensible
When it is above a conditioned space
Rise

3. At what temperature will brazing melt?
8-12 degrees F
Over 800 degrees F
Yes
By increasing the surface of the condenser coil

4. Do you need a trap on a push-through evaporator?
No
1/4'
45 degrees F
Btu/hr (output) / wattage (input)

5. If the rpm's are 750 - how many poles does the motor have?
4
The suction line or the low-pressure side
8
105 degrees F

6. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
With an are rating
Average feet per minute X area in square feet (H' x W'/144)
2

7. How do you calculate the area of a circle?
Outside of the male fitting
A band 4 inches or more in width
Yes
Pi x radius squared

8. 9' round duct has a ballpark cfm of what?
Static pressure - velocity pressure - and total pressure
Dehydrated with caps on each end
Stranded
300

9. How is ACR tubing sized?
Outside diameter (OD)
6
Belt drive and direct drive
Positive

10. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
105 degrees F
Shorted winding - open winding - and grounded winding
SEER includes the energy used in the start-up and shut-down cycles

11. At what temperature will soft solder melt?
Yes
Below 800 degrees F
Blended refrigerants
Subtract ambient temperature from 100

12. 13 SEER is classified as what kind of efficiency?
5 degrees
Over 800 degrees F
High
The suction line or the low-pressure side

13. Where do you apply flux when soldering?
Compressor
Outside of the male fitting
Boil the liquid refrigerant out ot the oil within the crankcase
Belt drive and direct drive

14. How do you calculate cfm?

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15. What are the two basic duct connection configurations for package units supply and return air ducts?
With 4' saddles
With an are rating
Staples and tape
Over/under and side by side

16. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Yes
Latent and sensible
To remove humidity and lower dry bulb temperature

17. How is ACR tubing sized?
100 psig
Yes
Outside diameter (OD)
Pi x radius squared

18. What is it called when liquid refrigerant gets into the compressor?
A dirty evaporator
Slugging
A diffuser
Boil the liquid refrigerant out ot the oil within the crankcase

19. Where do you check the amps on a motor?
Yes
40 degrees F
On the common terminal
By increasing the surface of the condenser coil

20. What sort of pressure will a push-through evaporator have?
12000
It will have a decrease in superheat
Positive
No

21. How do you calculate the area of a circle?
A band 4 inches or more in width
6
Pi x radius squared
TXV

22. What sort of pressure will a push-through evaporator have?
45 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
Positive
Btu/hr (output) / wattage (input)

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

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24. What kind of copper tubing is used for refrigeration or air-conditioning applications?
15% silphos
Yes
ACR (air-conditioning refrigeration) tubing
Individual return air systems and central return air systems

25. How will too much refrigerant effect subcooling?
They are physically larger
Dehydrated with caps on each end
It will be high
Slugging

26. 9' round duct has a ballpark cfm of what?
300
Staples and tape
It will have a decrease in superheat
RLA/FLA x 5

27. The load on the evaporater will effect which pressure?
Suction
Individual return air systems and central return air systems
Before the vent
5 degrees

28. How is flexible duct supported?
Individual return air systems and central return air systems
Pistons
A band 4 inches or more in width
5 degrees

29. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
30-35 degrees above ambient
12000
Heat load

30. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
2 minutes
Yes
150

31. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
4
Heat load
400

32. Where do you install a trap on a drain line?
On the common terminal
Before the vent
Shorted winding - open winding - and grounded winding
Inside diameter (ID)

33. How are the condenser coils different on a high-efficiency unit?
RLA/FLA x 5
8-12 degrees F
It also rises
They are larger

34. If the rpm's are 3450 - how many poles does the motor have?
2
Belt drive and direct drive
Yes
A band 4 inches or more in width

35. What are the two functions of the air-conditioning system?
A bypass duct or a dump zone
To remove humidity and lower dry bulb temperature
Pull a vacuum
TXV

36. How is nominal-sized tubing sized?
Inclined manometer
It will be high
Inside diameter (ID)
40 degrees F

37. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Yes
To lower the amount of pressure drop through the coil
300
It will be low

38. How many BTU's per ton?
SEER includes the energy used in the start-up and shut-down cycles
Belt drive and direct drive
12000
1/4'

39. At what temperature will soft solder melt?
Below 800 degrees F
Over/under and side by side
Common
20 degrees F

40. What are the three pressures created by moving air in ductwork?
By increasing the surface of the condenser coil
30-35 degrees above ambient
Inclined manometer
Static pressure - velocity pressure - and total pressure

41. What are normal conditions - as defined by the ARI.
Indoor fan motor - outdoor fan motor - and the compressor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
20 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

42. When must a copper joint never be soldered or brazed?
No
When the system is under pressure
In parallel
Latent and sensible

43. What distributes supply air to a room in a structure?
4
A diffuser
Yes
ACR (air-conditioning refrigeration) tubing

44. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
With an are rating
In parallel
30 degrees F
The suction line or the low-pressure side

45. How do you calculate EER?
1/4'
Heat load
On the common terminal
Btu/hr (output) / wattage (input)

46. How is the high pressure switch wired with the low pressure switch?
In parallel
20 degrees above ambient
Before the vent
Slugging

47. In what state is the refrigerant in the compressor?
Duct with insulation on the inside
Vapor
Side-by-side and over-and-under
Yes

48. How long should you leave a system off once you kill power before restarting it?
40 A
8-12 degrees F
2 minutes
By increasing the surface of the condenser coil

49. What is the normal evaporator temperature?
45 degrees F
Inches of water column (in. WC)
8-12 degrees F
Side-by-side and over-and-under

50. How do you achieve high-efficiency?
100
By increasing the surface of the condenser coil
8-12 degrees F
When it is a pull-through evaporator