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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. The crankcase heater on an air-conditioning compressor is used to what?
20 A
Boil the liquid refrigerant out ot the oil within the crankcase
With a minimum of three evenly spaced self-tapping screws
Side-by-side and over-and-under

2. What do you use to check for leaks?
100
Nitrogen with a small amount of refrigerant
Before the vent
Duct with insulation on the inside

3. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
TXV
1/4'
Btu/hr (output) / wattage (input)

4. At what temperature will brazing melt?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
140 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Over 800 degrees F

5. What is the name of the fitting where the branch line leaves the duct?
False
The takeoff fitting
20 A
Belt drive and direct drive

6. 6' round duct has a ballpark cfm of what?
6
It will be high
100
Yes

7. How are round ducts supported?

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8. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
A piston type metering device
30 degrees F
150
Indoor fan motor - outdoor fan motor - and the compressor

9. What is the difference between SEER and EER?
Inches of water column (in. WC)
It will be high
30 degrees F
SEER includes the energy used in the start-up and shut-down cycles

10. If the rpm's are 1750 - how many poles does the motor have?
5 degrees
Standard
4
To remove humidity and lower dry bulb temperature

11. How many cfm per ton?
Outside of the male fitting
25-ft or 50-ft
A diffuser
400

12. What sort of pressure will a push-through evaporator have?
Over 800 degrees F
Common
Indoor fan motor - outdoor fan motor - and the compressor
Positive

13. When do you install a trap on a drain line?
Suction
15 A
15% silphos
When it is a pull-through evaporator

14. Will a dirty condenser cause a rise or fall in pressure?
SEER includes the energy used in the start-up and shut-down cycles
When the system is under pressure
Rise
Over 800 degrees F

15. How does ACR copper pipe come?
Blended refrigerants
Dehydrated with caps on each end
300
5 degrees

16. What is the name of the fitting where the branch line leaves the duct?
30 A
The takeoff fitting
Pistons
400

17. If the rpm's are 3450 - how many poles does the motor have?
5 degrees
8
2
45-55%

18. What is considered normal operating conditions?
Yes
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
SEER includes the energy used in the start-up and shut-down cycles
8-12 degrees F

19. How long should you leave a system off once you kill power before restarting it?
2 minutes
Potential relay and start capacitor
Nitrogen with a small amount of refrigerant
A dirty evaporator

20. In what state is the refrigerant in the compressor?
They are larger
Vapor
Potential relay and start capacitor
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

21. What is the range for normal superheat and subcooling?
It rises
8-12 degrees F
Pull a vacuum
400

22. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
30 degrees F
Yes

23. How do you calculate LRA?
8
RLA/FLA x 5
2 minutes
In series

24. What are the two ways that fresh air enters a structure?
They are larger
Staples and tape
Stranded
Infiltration and ventilation

25. How are round ducts connected to one another?
It will have a decrease in superheat
With a minimum of three evenly spaced self-tapping screws
The suction line or the low-pressure side
TXV

26. What are the components of a hard-start kit?
Potential relay and start capacitor
TXV
Yes
18 gauge

27. What are the two functions of the air-conditioning system?
When it is a pull-through evaporator
To remove humidity and lower dry bulb temperature
20 A
15% silphos

28. Why are some ACR tubing lines insulated?
Staples and tape
Potential relay and start capacitor
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A dirty evaporator

29. How many amps can 14 g wire handle?
40 degrees F
5 degrees
A dirty evaporator
15 A

30. How many amps can 10 g wire handle?
Yes
30 A
Before the vent
Yes

31. If the rpm's are 1050 - how many poles does the motor have?
With a minimum of three evenly spaced self-tapping screws
400
Vapor
6

32. What is the range for normal superheat and subcooling?
Staples and tape
Suction
Infiltration and ventilation
8-12 degrees F

33. What gauge is thermostat wire?
15 A
Yes
TXV
18 gauge

34. The evaporator is designed to remove what two types of heat?
In series
Latent and sensible
Infiltration and ventilation
Belt drive and direct drive

35. What are the three pressures created by moving air in ductwork?
When it is a pull-through evaporator
False
Static pressure - velocity pressure - and total pressure
45 degrees F

36. What are the three crafts normally associated with an air-conditioned installation?
Yes
Belt drive and direct drive
Duct - electrical - and mechanical
400

37. A reciprocating compressor has what sort of moving parts?
Pistons
With a minimum of three evenly spaced self-tapping screws
TXV
Outside of the male fitting

38. What kind of copper tubing is used for refrigeration or air-conditioning applications?
SEER includes the energy used in the start-up and shut-down cycles
ACR (air-conditioning refrigeration) tubing
Yes
Compressor

39. A reciprocating compressor has what sort of moving parts?
Pistons
Btu/hr (output) / wattage (input)
Below 800 degrees F
Staples and tape

40. What is it called when liquid refrigerant gets into the compressor?
True
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Slugging
25-ft or 50-ft

41. What are the two basic duct connection configurations for package units supply and return air ducts?
5 degrees
1/4'
Over/under and side by side
Outside of the male fitting

42. 13 SEER is classified as what kind of efficiency?
40 A
High
False
5 degrees

43. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
5 degrees
20 degrees F
2 minutes
To remove humidity and lower dry bulb temperature

44. At what temperature will soft solder melt?
Below 800 degrees F
25-ft or 50-ft
When it is above a conditioned space
Pistons

45. 13 SEER is classified as what kind of efficiency?
High
ACR (air-conditioning refrigeration) tubing
Yes
By increasing the surface of the condenser coil

46. Where is insulation used on copper tubing used for air-conditioning?
Fiberglass
The suction line or the low-pressure side
With an are rating
Infiltration and ventilation

47. The furnace size is calculated by what?
With 4' saddles
Average feet per minute X area in square feet (H' x W'/144)
18 gauge
Heat loss

48. How is nominal-sized tubing sized?
Inside diameter (ID)
150
Inclined manometer
100

49. Do you need a trap on a pull-through evaporator?
High
Yes
L-type
Infiltration and ventilation

50. Most duct insulation is made of what?
Fiberglass
When the system is under pressure
A swaging tool
Over/under and side by side