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Residential Air Conditioning

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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. If the rpm's are 3450 - how many poles does the motor have?
105 degrees F
Side-by-side and over-and-under
2
The takeoff fitting

2. If the rpm's are 1050 - how many poles does the motor have?
Dehydrated with caps on each end
SEER includes the energy used in the start-up and shut-down cycles
6
When the system is under pressure

3. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
No
When it is a pull-through evaporator
20 A

4. Will a dirty condenser cause a rise or fall in pressure?
Rise
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
On the common terminal
40 A

5. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
When it is a pull-through evaporator
105 degrees F
Yes

6. Can refrigerant line sets be altered in length?
Btu/hr (output) / wattage (input)
Yes
200
A dirty evaporator

7. 13 SEER is classified as what kind of efficiency?
105 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
High
40 degrees F

8. How are the condenser coils different on a high-efficiency unit?
To lower the amount of pressure drop through the coil
They are larger
Infiltration and ventilation
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

9. What are the components of a hard-start kit?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
2 minutes
400
Potential relay and start capacitor

10. If the suction pressure rises - what happens to the head pressure?
8
It also rises
Latent and sensible
100

11. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
100 psig
20 A
20 A

12. 8' round duct has a ballpark cfm of what?
High
In series
200
SEER includes the energy used in the start-up and shut-down cycles

13. The furnace size is calculated by what?
Common
TXV
12000
Heat loss

14. Where do you check the amps on a motor?
Stranded
45 degrees F
On the common terminal
Duct - electrical - and mechanical

15. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
Individual return air systems and central return air systems
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Below 800 degrees F

16. At what temperature will soft solder melt?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Below 800 degrees F
True
SEER includes the energy used in the start-up and shut-down cycles

17. What are the two types of return air systems in residential installations?
Btu/hr (output) / wattage (input)
On the common terminal
Individual return air systems and central return air systems
Inclined manometer

18. At what temperature will soft solder melt?
140 degrees F
Below 800 degrees F
It rises
15 A

19. What are the three pressures created by moving air in ductwork?
A bypass duct or a dump zone
Static pressure - velocity pressure - and total pressure
Outside diameter (OD)
Before the vent

20. How many amps can 12 g wire handle?
High
20 A
Pistons
When the system is under pressure

21. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Common
30 degrees F
150
The suction line or the low-pressure side

22. What kind of copper tubing is used for plumbing and heating applications?
15% silphos
Btu/hr (output) / wattage (input)
Nominal-sized tubing
Staples and tape

23. How many cfm per ton?
400
Vapor
To remove humidity and lower dry bulb temperature
Infiltration and ventilation

24. Why are some ACR tubing lines insulated?
200
L-type
2 minutes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

25. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
With an are rating
A swaging tool
ACR (air-conditioning refrigeration) tubing
40 degrees F

26. What kind of copper tubing is used for plumbing and heating applications?
Before the vent
Nominal-sized tubing
It will have a decrease in superheat
Side-by-side and over-and-under

27. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Yes
High
40 degrees F
100 psig

28. Do you need a trap on a push-through evaporator?
Individual return air systems and central return air systems
TXV
20 degrees F
No

29. What are the two ways that fresh air enters a structure?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Shorted winding - open winding - and grounded winding
Infiltration and ventilation
The takeoff fitting

30. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Fiberglass
Inside diameter (ID)
Yes

31. How many cfm per ton?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Indoor fan motor - outdoor fan motor - and the compressor
400
On the common terminal

32. What is a package unit?
15 A
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
True
Staples and tape

33. The compressor is cooled by liquid refrigerant. (True of False)
False
18 gauge
5 degrees
30 degrees F

34. What is the range for normal superheat and subcooling?
Over 800 degrees F
8-12 degrees F
SEER includes the energy used in the start-up and shut-down cycles
15 A

35. How is the high pressure switch wired with the low pressure switch?
Btu/hr (output) / wattage (input)
In parallel
It will be low
Blended refrigerants

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

37. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
140 degrees F
Yes
Stranded
They are physically larger

38. Where do you check the amps on a motor?
S-clips and drives (cleats)
Outside of the male fitting
2
On the common terminal

39. Where do you apply flux when soldering?
Outside of the male fitting
False
105 degrees F
Below 800 degrees F

40. How many amps can 8 g wire handle?
40 A
The takeoff fitting
100 psig
2 minutes

41. What percentage silver do you need to use for an are-410 system?
Inside diameter (ID)
Outside diameter (OD)
In parallel
15% silphos

42. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
ACR (air-conditioning refrigeration) tubing
Indoor fan motor - outdoor fan motor - and the compressor
In series
Suction

43. The compressor is cooled by liquid refrigerant. (True of False)
It will be low
To remove humidity and lower dry bulb temperature
False
40 degrees F

44. In what state is the refrigerant in the compressor?
Vapor
Inches of water column (in. WC)
With an are rating
False

45. The fan switch closes at what temperature?
By increasing the surface of the condenser coil
140 degrees F
40 degrees F
8-12 degrees F

46. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
105 degrees F
Heat loss
20 A

47. Will a dirty condenser cause a rise or fall in pressure?
Rise
20 A
100 psig
25-ft or 50-ft

48. How do you calculate cfm?

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49. If the rpm's are 1750 - how many poles does the motor have?
4
Stranded
They are physically larger
18 gauge

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

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Residential Air Conditioning

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