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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?
RLA/FLA x 5
Duct with insulation on the inside
When the system is under pressure
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

2. What can cause a decrease in suction pressure on an air-conditioning system?
Before the vent
Any amount
Boil the liquid refrigerant out ot the oil within the crankcase
A dirty evaporator

3. What is lined duct?
Duct with insulation on the inside
Stranded
5 degrees
Pistons

4. What kind of metering device do high-efficiency units usually use?
TXV
A swaging tool
4
On the common terminal

5. How will too much refrigerant effect superheat?
400
SEER includes the energy used in the start-up and shut-down cycles
It will be low
6

6. How do you achieve high-efficiency?
Before the vent
By increasing the surface of the condenser coil
Common
A dirty evaporator

7. What is the difference between SEER and EER?
Indoor fan motor - outdoor fan motor - and the compressor
1/4'
Yes
SEER includes the energy used in the start-up and shut-down cycles

8. What are the two types of package units?
Side-by-side and over-and-under
In parallel
Slugging
A swaging tool

9. What are the three major power-consuming devices on an air-conditioning system?
Inside diameter (ID)
Heat load
Nominal-sized tubing
Indoor fan motor - outdoor fan motor - and the compressor

10. How many amps can 8 g wire handle?
Belt drive and direct drive
In parallel
Dehydrated with caps on each end
40 A

11. How will too much refrigerant effect subcooling?
It will be high
In series
30 degrees F
400

12. What are the two ways that fresh air enters a structure?
Rise
Staples and tape
Yes
Infiltration and ventilation

13. What tool is used to expand the diameter of soft copper tubing
A swaging tool
Side-by-side and over-and-under
Nitrogen with a small amount of refrigerant
40 A

14. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
Infiltration and ventilation
With an are rating
Fiberglass

15. 9' round duct has a ballpark cfm of what?
Shorted winding - open winding - and grounded winding
300
Yes
30 degrees F

16. The crankcase heater on an air-conditioning compressor is used to what?
With an are rating
Before the vent
Boil the liquid refrigerant out ot the oil within the crankcase
Nitrogen with a small amount of refrigerant

17. Does a package unit come from the factory pre-charged?
Outside of the male fitting
Yes
Vapor
100 psig

18. If pressure rises - what happens to the superheat?
It rises
8-12 degrees F
False
Compressor

19. What is the normal evaporator temperature?
No
High
Shorted winding - open winding - and grounded winding
45 degrees F

20. Do you need a vent on a pull-through evaporator?
40 degrees F
Yes
Over/under and side by side
Vapor

21. The load on the evaporater will effect which pressure?
Suction
45-55%
400
4

22. What kind of copper tubing is used for refrigeration or air-conditioning applications?
6
Inside diameter (ID)
ACR (air-conditioning refrigeration) tubing
A piston type metering device

23. 13 SEER is classified as what kind of efficiency?
Indoor fan motor - outdoor fan motor - and the compressor
Individual return air systems and central return air systems
High
It will be high

24. When must a copper joint never be soldered or brazed?
A diffuser
Over 800 degrees F
Inches of water column (in. WC)
When the system is under pressure

25. How is ACR tubing sized?
Outside diameter (OD)
20 degrees above ambient
20 degrees above ambient
Yes

26. What are the components of a hard-start kit?
45 degrees F
400
45 degrees F
Potential relay and start capacitor

27. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
30 degrees F
2
Individual return air systems and central return air systems

28. Where do you check the amps on a motor?
Rise
On the common terminal
105 degrees F
In series

29. How do you calculate EER?
Btu/hr (output) / wattage (input)
30 A
By increasing the surface of the condenser coil
Duct - electrical - and mechanical

30. What kind of refrigeratnts must be added in liquid form?
It also rises
105 degrees F
In parallel
Blended refrigerants

31. Why are some ACR tubing lines insulated?
300
It rises
A swaging tool
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

32. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
In parallel
150
Suction

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

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34. What are the two types of return air systems in residential installations?
Pistons
Individual return air systems and central return air systems
Yes
TXV

35. The fan switch opens at what temperature?
Vapor
Over/under and side by side
It will be high
105 degrees F

36. At what temperature will soft solder melt?
Below 800 degrees F
8-12 degrees F
When it is above a conditioned space
The suction line or the low-pressure side

37. How do you calculate the area of a circle?
The takeoff fitting
Static pressure - velocity pressure - and total pressure
Pi x radius squared
18 gauge

38. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
2 minutes
The suction line or the low-pressure side

39. 10 SEER is classified as what kind of efficiency?
Heat load
45-55%
Standard
False

40. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
12000
Blended refrigerants
They are physically larger

41. What are the two types of blower drives?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Side-by-side and over-and-under
40 A
Belt drive and direct drive

42. Do you need a vent on a push-through evaporator?
Yes
True
In parallel
Indoor fan motor - outdoor fan motor - and the compressor

43. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
Below 800 degrees F
A band 4 inches or more in width
Yes

44. When do you install a trap on a drain line?
25-ft or 50-ft
Pull a vacuum
Below 800 degrees F
When it is a pull-through evaporator

45. Do you need a vent on a pull-through evaporator?
Common
200
Yes
400

46. What are normal conditions - as defined by the ARI.
20 A
40 degrees F
Below 800 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

47. Will a dirty condenser cause a rise or fall in pressure?
Rise
Yes
Inclined manometer
By increasing the surface of the condenser coil

48. The A/C size is calculated by what?
45 degrees F
Heat load
Pull a vacuum
Dehydrated with caps on each end

49. Where do you apply flux when soldering?
It also rises
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
High
Outside of the male fitting

50. What percentage silver do you need to use for an are-410 system?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
In series
40 degrees F
15% silphos