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Residential Air Conditioning

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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 are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
It will have a decrease in superheat
Inclined manometer
Btu/hr (output) / wattage (input)

2. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
Vapor
Stranded
15 A

3. What are the four materials used to make duct?
The suction line or the low-pressure side
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
30 degrees F
Slugging

4. What percentage silver do you need to use for an are-410 system?
A band 4 inches or more in width
100
100
15% silphos

5. Sections of duct board can be fastened together with what?
Staples and tape
Blended refrigerants
2 minutes
Infiltration and ventilation

6. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
1/4'
40 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

7. What are the components of a hard-start kit?
15% silphos
Shorted winding - open winding - and grounded winding
Potential relay and start capacitor
In parallel

8. What tool is used to expand the diameter of soft copper tubing
A swaging tool
Heat load
It also rises
RLA/FLA x 5

9. How many amps can 8 g wire handle?
400
40 A
The suction line or the low-pressure side
It will be high

10. How do you calculate ballpark superheat?
Nominal-sized tubing
Subtract ambient temperature from 100
Heat loss
Btu/hr (output) / wattage (input)

11. What are the two basic duct connection configurations for package units supply and return air ducts?
TXV
To lower the amount of pressure drop through the coil
40 degrees F
Over/under and side by side

12. What kind of copper tubing is used for plumbing and heating applications?
Side-by-side and over-and-under
A band 4 inches or more in width
Nominal-sized tubing
45 degrees F

13. What is the design boiling point for most evaporator coils in residential air conditioning?
100
Over/under and side by side
When it is above a conditioned space
40 degrees F

14. How is flexible duct supported?
A band 4 inches or more in width
Any amount
Rise
105 degrees F

15. How do you calculate ballpark superheat?
A diffuser
Subtract ambient temperature from 100
A piston type metering device
Infiltration and ventilation

16. The fan switch closes at what temperature?
Indoor fan motor - outdoor fan motor - and the compressor
45 degrees F
140 degrees F
A diffuser

17. What gauge is thermostat wire?
With a minimum of three evenly spaced self-tapping screws
A dirty evaporator
18 gauge
SEER includes the energy used in the start-up and shut-down cycles

18. How do you achieve high-efficiency?
False
Inches of water column (in. WC)
By increasing the surface of the condenser coil
Shorted winding - open winding - and grounded winding

19. How does ACR copper pipe come?
Dehydrated with caps on each end
Standard
S-clips and drives (cleats)
Heat load

20. At what temperature will soft solder melt?
200
Yes
Below 800 degrees F
With a minimum of three evenly spaced self-tapping screws

21. How do you calculate EER?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Btu/hr (output) / wattage (input)
Fiberglass
4

22. At what temperature does refrigerant condense in a standard-efficiency unit?
Yes
30-35 degrees above ambient
200
2 minutes

23. If the rpm's are 750 - how many poles does the motor have?
Inside diameter (ID)
8
Slugging
2

24. Where do you check the amps on a motor?
100 psig
30 degrees F
SEER includes the energy used in the start-up and shut-down cycles
On the common terminal

25. Do you need a trap on a push-through evaporator?
Nitrogen with a small amount of refrigerant
Fiberglass
They are physically larger
No

26. What distributes supply air to a room in a structure?
A diffuser
45-55%
Vapor
It also rises

27. 10' round duct has a ballpark cfm of what?
Fiberglass
On the common terminal
400
In parallel

28. What are the two functions of the air-conditioning system?
18 gauge
A swaging tool
To remove humidity and lower dry bulb temperature
The suction line or the low-pressure side

29. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
Pistons
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A piston type metering device

30. Can refrigerant line sets be altered in length?
TXV
Yes
A dirty evaporator
Indoor fan motor - outdoor fan motor - and the compressor

31. What percentage silver do you need to use for an are-410 system?
15% silphos
40 A
Negative
400

32. What are the three ways a motor can fail electrically?
False
Shorted winding - open winding - and grounded winding
20 degrees F
Inclined manometer

33. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
With 4' saddles
Latent and sensible
Dehydrated with caps on each end

34. How is insulation around a duct rated?
Heat load
With an are rating
5 degrees
30 A

35. How do you calculate the area of a circle?
Pi x radius squared
Any amount
They are physically larger
300

36. How will too much refrigerant effect subcooling?
Indoor fan motor - outdoor fan motor - and the compressor
Inclined manometer
It will be high
Pull a vacuum

37. Will a dirty condenser cause a rise or fall in pressure?
Rise
SEER includes the energy used in the start-up and shut-down cycles
When the system is under pressure
100

38. What is a package unit?
Common
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Inches of water column (in. WC)
30 A

39. What is the normal evaporator temperature?
15% silphos
RLA/FLA x 5
45 degrees F
Infiltration and ventilation

40. What are the four materials used to make duct?
By increasing the surface of the condenser coil
It will be high
Vapor
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

41. How many amps can 12 g wire handle?
45 degrees F
12000
Suction
20 A

42. What are the two types of blower drives?
Fiberglass
Belt drive and direct drive
A diffuser
Standard

43. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
150
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
In series
Subtract ambient temperature from 100

44. Do you need a trap on a push-through evaporator?
No
45 degrees F
To lower the amount of pressure drop through the coil
Potential relay and start capacitor

45. When do you install an auxillary drain pan?
40 A
When it is above a conditioned space
Before the vent
It will have a decrease in superheat

46. What are the three pressures created by moving air in ductwork?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Static pressure - velocity pressure - and total pressure
40 A
True

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

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48. What is the range for normal superheat and subcooling?
8-12 degrees F
Rise
Staples and tape
2 minutes

49. 9' round duct has a ballpark cfm of what?
Duct with insulation on the inside
Standard
1/4'
300

50. When do you install a trap on a drain line?
RLA/FLA x 5
Inches of water column (in. WC)
When it is a pull-through evaporator
A bypass duct or a dump zone

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Residential Air Conditioning

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