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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. Which type of wire can handle a higher ampacity?
S-clips and drives (cleats)
They are larger
300
Stranded

2. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
False
L-type
It rises
20 degrees above ambient

3. On what terminal do you check amperage?
By increasing the surface of the condenser coil
8
By increasing the surface of the condenser coil
Common

4. Do you need a trap on a pull-through evaporator?
25-ft or 50-ft
Yes
Belt drive and direct drive
A dirty evaporator

5. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Standard
Heat loss
To lower the amount of pressure drop through the coil
Over/under and side by side

6. How do you calculate LRA?
Pi x radius squared
RLA/FLA x 5
1/4'
Inches of water column (in. WC)

7. How do you calculate cfm?

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8. How many amps can 14 g wire handle?
15 A
Positive
8-12 degrees F
RLA/FLA x 5

9. 13 SEER is classified as what kind of efficiency?
It will have a decrease in superheat
High
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

10. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Over/under and side by side
TXV
Any amount
105 degrees F

11. In what state is the refrigerant in the compressor?
Vapor
8-12 degrees F
15 A
8

12. When do you install an auxillary drain pan?
When it is above a conditioned space
6
Staples and tape
RLA/FLA x 5

13. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
L-type
18 gauge
It will be high

14. How is flexible duct supported?
4
A band 4 inches or more in width
140 degrees F
SEER includes the energy used in the start-up and shut-down cycles

15. How are the condenser coils different on a high-efficiency unit?
1/4'
Positive
Belt drive and direct drive
They are larger

16. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Outside diameter (OD)
No
15% silphos

17. If the rpm's are 1750 - how many poles does the motor have?
Pi x radius squared
20 A
4
To lower the amount of pressure drop through the coil

18. Superheat should never be below how many degrees
To remove humidity and lower dry bulb temperature
8-12 degrees F
Suction
5 degrees

19. How is the high pressure switch wired with the low pressure switch?
Standard
15 A
In parallel
Rise

20. What are the two ways that fresh air enters a structure?
Below 800 degrees F
Infiltration and ventilation
Duct with insulation on the inside
Static pressure - velocity pressure - and total pressure

21. 13 SEER is classified as what kind of efficiency?
High
20 degrees above ambient
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
12000

22. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Infiltration and ventilation
Shorted winding - open winding - and grounded winding
The suction line or the low-pressure side
True

23. At what temperature will brazing melt?
It will have a decrease in superheat
TXV
6
Over 800 degrees F

24. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Suction
Any amount
Over 800 degrees F
Pi x radius squared

25. How many BTU's per ton?
With a minimum of three evenly spaced self-tapping screws
12000
8
40 degrees F

26. What are the three major power-consuming devices on an air-conditioning system?
A piston type metering device
30 A
Indoor fan motor - outdoor fan motor - and the compressor
L-type

27. 8' round duct has a ballpark cfm of what?
200
Before the vent
When it is above a conditioned space
Blended refrigerants

28. What sort of pressure will a push-through evaporator have?
18 gauge
20 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Positive

29. How many amps can 10 g wire handle?
TXV
In parallel
6
30 A

30. When do you install a trap on a drain line?
In parallel
Individual return air systems and central return air systems
When it is a pull-through evaporator
With an are rating

31. The compressor is cooled by liquid refrigerant. (True of False)
Over 800 degrees F
False
When the system is under pressure
When it is a pull-through evaporator

32. The crankcase heater on an air-conditioning compressor is used to what?
40 A
18 gauge
4
Boil the liquid refrigerant out ot the oil within the crankcase

33. What distributes supply air to a room in a structure?
25-ft or 50-ft
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Positive
A diffuser

34. What distributes supply air to a room in a structure?
It will be low
A diffuser
100
Yes

35. 10' round duct has a ballpark cfm of what?
Staples and tape
400
Inside diameter (ID)
Side-by-side and over-and-under

36. How do you calculate EER?
Btu/hr (output) / wattage (input)
L-type
Common
When it is above a conditioned space

37. How many cfm per ton?
Pull a vacuum
Blended refrigerants
400
40 A

38. What tool is used to expand the diameter of soft copper tubing
2
The suction line or the low-pressure side
A swaging tool
20 degrees above ambient

39. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Over 800 degrees F
A piston type metering device
45 degrees F
30 degrees F

40. If the rpm's are 3450 - how many poles does the motor have?
Suction
2
By increasing the surface of the condenser coil
To remove humidity and lower dry bulb temperature

41. Where do you check the amps on a motor?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
On the common terminal
False
8

42. Where is insulation used on copper tubing used for air-conditioning?
Belt drive and direct drive
The suction line or the low-pressure side
40 degrees F
Potential relay and start capacitor

43. How are round ducts connected to one another?
8-12 degrees F
Yes
12000
With a minimum of three evenly spaced self-tapping screws

44. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Pistons
30 A
A swaging tool
They are physically larger

45. What is lined duct?
Duct with insulation on the inside
When it is above a conditioned space
Positive
Inclined manometer

46. What are the two functions of the air-conditioning system?
Duct with insulation on the inside
Rise
To remove humidity and lower dry bulb temperature
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

47. At what temperature does refrigerant condense in a high-efficiency unit?
To remove humidity and lower dry bulb temperature
L-type
20 degrees above ambient
In series

48. What can cause a decrease in suction pressure on an air-conditioning system?
Positive
With 4' saddles
Blended refrigerants
A dirty evaporator

49. Can refrigerant line sets be altered in length?
20 degrees F
2 minutes
Suction
Yes

50. What is a package unit?
Outside diameter (OD)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
With a minimum of three evenly spaced self-tapping screws
Over/under and side by side