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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 the normal evaporator temperature?
A diffuser
Yes
45 degrees F
18 gauge

2. 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
2 minutes
4
RLA/FLA x 5

3. On what terminal do you check amperage?
400
Outside of the male fitting
Standard
Common

4. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Outside diameter (OD)
To lower the amount of pressure drop through the coil
30 A
Below 800 degrees F

5. What are the two functions of the air-conditioning system?
Btu/hr (output) / wattage (input)
A diffuser
With an are rating
To remove humidity and lower dry bulb temperature

6. What can cause a decrease in suction pressure on an air-conditioning system?
Vapor
Belt drive and direct drive
Latent and sensible
A dirty evaporator

7. How are round ducts connected to one another?
Individual return air systems and central return air systems
With a minimum of three evenly spaced self-tapping screws
When it is above a conditioned space
True

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

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9. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Yes
L-type
With an are rating
They are physically larger

10. Do you need a vent on a pull-through evaporator?
Nitrogen with a small amount of refrigerant
40 degrees F
With a minimum of three evenly spaced self-tapping screws
Yes

11. How long should you leave a system off once you kill power before restarting it?
Static pressure - velocity pressure - and total pressure
Nominal-sized tubing
2
2 minutes

12. What tool is used to expand the diameter of soft copper tubing
Vapor
A swaging tool
It will be low
Infiltration and ventilation

13. What do you do after you braze a system?
It will have a decrease in superheat
Nominal-sized tubing
Pull a vacuum
Rise

14. What is a package unit?
SEER includes the energy used in the start-up and shut-down cycles
S-clips and drives (cleats)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Over/under and side by side

15. How do you achieve high-efficiency?
It also rises
40 degrees F
By increasing the surface of the condenser coil
False

16. What are normal conditions - as defined by the ARI.
40 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Inclined manometer
Yes

17. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
1/4'
Inclined manometer
They are physically larger

18. What are normal conditions - as defined by the ARI.
40 degrees F
45 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

19. At what temperature will brazing melt?
Individual return air systems and central return air systems
Pistons
Over 800 degrees F
The suction line or the low-pressure side

20. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
5 degrees
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
RLA/FLA x 5

21. What is it called when liquid refrigerant gets into the compressor?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
S-clips and drives (cleats)
Slugging
15 A

22. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Staples and tape
Standard
20 degrees F

23. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Static pressure - velocity pressure - and total pressure
A swaging tool
Dehydrated with caps on each end

24. When do you install a trap on a drain line?
It will have a decrease in superheat
8
When it is a pull-through evaporator
The suction line or the low-pressure side

25. At what temperature does refrigerant condense in a standard-efficiency unit?
When it is a pull-through evaporator
1/4'
Inside diameter (ID)
30-35 degrees above ambient

26. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
20 degrees F
Yes
8

27. What kind of metering device do high-efficiency units usually use?
Heat loss
TXV
ACR (air-conditioning refrigeration) tubing
A bypass duct or a dump zone

28. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
When the system is under pressure
Standard
20 A

29. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
300
L-type
Before the vent
A bypass duct or a dump zone

30. How are the condenser coils different on a high-efficiency unit?
In parallel
To remove humidity and lower dry bulb temperature
When it is a pull-through evaporator
They are larger

31. What do you use to connect square and rectangular ductboard together?
400
A piston type metering device
True
S-clips and drives (cleats)

32. Why are some ACR tubing lines insulated?
Heat load
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
No
It also rises

33. If the rpm's are 1050 - how many poles does the motor have?
Nominal-sized tubing
6
Heat loss
5 degrees

34. If the rpm's are 750 - how many poles does the motor have?
8
20 degrees F
Common
Standard

35. How is nominal-sized tubing sized?
Inside diameter (ID)
8
400
Heat load

36. Where do you check the amps on a motor?
Any amount
On the common terminal
Nitrogen with a small amount of refrigerant
Blended refrigerants

37. The compressor is cooled by liquid refrigerant. (True of False)
140 degrees F
Potential relay and start capacitor
False
15 A

38. Pressure in ductwork is measured In what?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Standard
40 degrees F
Inches of water column (in. WC)

39. The fan switch closes at what temperature?
30-35 degrees above ambient
140 degrees F
Any amount
When the system is under pressure

40. Sections of duct board can be fastened together with what?
20 degrees above ambient
Blended refrigerants
Inside diameter (ID)
Staples and tape

41. Most duct insulation is made of what?
40 degrees F
Fiberglass
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
The suction line or the low-pressure side

42. What is the range for normal superheat and subcooling?
False
18 gauge
8-12 degrees F
400

43. What are the two ways that fresh air enters a structure?
400
400
They are physically larger
Infiltration and ventilation

44. At what temperature will brazing melt?
25-ft or 50-ft
5 degrees
Over 800 degrees F
Blended refrigerants

45. What tool is used to expand the diameter of soft copper tubing
No
A swaging tool
8-12 degrees F
S-clips and drives (cleats)

46. 6' round duct has a ballpark cfm of what?
On the common terminal
100
It also rises
150

47. Which type of wire can handle a higher ampacity?
It will have a decrease in superheat
Outside of the male fitting
Stranded
ACR (air-conditioning refrigeration) tubing

48. 10 SEER is classified as what kind of efficiency?
Staples and tape
Standard
When it is a pull-through evaporator
5 degrees

49. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Before the vent
When the system is under pressure
Common

50. The load on the evaporater will effect which pressure?
A bypass duct or a dump zone
Suction
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
By increasing the surface of the condenser coil