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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 lined duct?
Duct with insulation on the inside
200
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Dehydrated with caps on each end

2. What sort of pressure will a pull-through evaporator have?
With an are rating
True
Negative
Boil the liquid refrigerant out ot the oil within the crankcase

3. How do you calculate EER?
25-ft or 50-ft
Btu/hr (output) / wattage (input)
40 A
Yes

4. What are the components of a hard-start kit?
A swaging tool
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Potential relay and start capacitor
30 A

5. Why are some ACR tubing lines insulated?
Nominal-sized tubing
Infiltration and ventilation
They are physically larger
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

6. If the rpm's are 3450 - how many poles does the motor have?
No
2
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
300

7. Which type of wire can handle a higher ampacity?
Yes
Stranded
6
12000

8. If the rpm's are 1750 - how many poles does the motor have?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Any amount
Heat load
4

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

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10. What are the four materials used to make duct?
20 degrees above ambient
They are larger
Common
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

11. How do you calculate LRA?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
They are physically larger
25-ft or 50-ft
RLA/FLA x 5

12. How many cfm per ton?
A dirty evaporator
30-35 degrees above ambient
400
False

13. Superheat should never be below how many degrees
L-type
Dehydrated with caps on each end
5 degrees
2 minutes

14. How many amps can 12 g wire handle?
30 degrees F
Inside diameter (ID)
20 A
When it is above a conditioned space

15. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
Yes
Vapor
To lower the amount of pressure drop through the coil

16. What kind of metering device do high-efficiency units usually use?
TXV
On the common terminal
Inclined manometer
Heat load

17. How is nominal-sized tubing sized?
Slugging
Inside diameter (ID)
Potential relay and start capacitor
Below 800 degrees F

18. What kind of metering device do high-efficiency units usually use?
TXV
Outside diameter (OD)
30-35 degrees above ambient
Subtract ambient temperature from 100

19. How long should you leave a system off once you kill power before restarting it?
TXV
Heat load
2 minutes
105 degrees F

20. Where do you apply flux when soldering?
When it is a pull-through evaporator
With a minimum of three evenly spaced self-tapping screws
Outside of the male fitting
Duct with insulation on the inside

21. Most duct insulation is made of what?
Fiberglass
With an are rating
12000
Inclined manometer

22. How many amps can 12 g wire handle?
Fiberglass
Indoor fan motor - outdoor fan motor - and the compressor
20 A
20 degrees above ambient

23. What is the name of the fitting where the branch line leaves the duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
150
The takeoff fitting
A dirty evaporator

24. Does a package unit come from the factory pre-charged?
Yes
S-clips and drives (cleats)
5 degrees
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

25. How is ACR tubing sized?
When it is a pull-through evaporator
Outside diameter (OD)
Fiberglass
Slugging

26. 13 SEER is classified as what kind of efficiency?
Staples and tape
High
Individual return air systems and central return air systems
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

27. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
They are larger
Rise
Staples and tape

28. Why are some ACR tubing lines insulated?
True
15% silphos
It also rises
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

29. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
It will be high
15% silphos
Yes

30. What is a package unit?
Average feet per minute X area in square feet (H' x W'/144)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Latent and sensible
Indoor fan motor - outdoor fan motor - and the compressor

31. How many amps can 8 g wire handle?
2 minutes
When the system is under pressure
40 A
High

32. What do you do after you braze a system?
Outside of the male fitting
Pull a vacuum
Rise
It will be low

33. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
A piston type metering device
To lower the amount of pressure drop through the coil
Indoor fan motor - outdoor fan motor - and the compressor
The suction line or the low-pressure side

34. 10' round duct has a ballpark cfm of what?
4
Below 800 degrees F
400
Suction

35. What are the two types of blower drives?
12000
With a minimum of three evenly spaced self-tapping screws
Belt drive and direct drive
4

36. If pressure rises - what happens to the superheat?
To remove humidity and lower dry bulb temperature
It rises
They are physically larger
45-55%

37. What kind of copper tubing is used for plumbing and heating applications?
They are larger
Nominal-sized tubing
400
The suction line or the low-pressure side

38. What are the three crafts normally associated with an air-conditioned installation?
Fiberglass
Duct - electrical - and mechanical
4
Inside diameter (ID)

39. How is the high pressure switch wired with the low pressure switch?
It will have a decrease in superheat
Duct - electrical - and mechanical
In parallel
6

40. If pressure rises - what happens to the superheat?
When the system is under pressure
20 degrees above ambient
Shorted winding - open winding - and grounded winding
It rises

41. What distributes supply air to a room in a structure?
Potential relay and start capacitor
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Heat load
A diffuser

42. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
Inclined manometer
30 A
Over 800 degrees F

43. What are the three crafts normally associated with an air-conditioned installation?
Below 800 degrees F
40 degrees F
Duct - electrical - and mechanical
In series

44. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
40 A
Rise
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

45. What is the typical pressure differance across a TXV?
100 psig
When it is a pull-through evaporator
15 A
Vapor

46. In what state is the refrigerant in the compressor?
Vapor
Infiltration and ventilation
No
Blended refrigerants

47. 10' round duct has a ballpark cfm of what?
400
Latent and sensible
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Subtract ambient temperature from 100

48. 7' round duct has a ballpark cfm of what?
150
Positive
400
12000

49. The A/C size is calculated by what?
It rises
RLA/FLA x 5
Negative
Heat load

50. At what temperature will soft solder melt?
RLA/FLA x 5
45 degrees F
140 degrees F
Below 800 degrees F