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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 are the two basic duct connection configurations for package units supply and return air ducts?
Outside of the male fitting
Any amount
Nominal-sized tubing
Over/under and side by side

2. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
1/4'
Compressor
Inside diameter (ID)
They are physically larger

3. What percentage silver do you need to use for an are-410 system?
400
15% silphos
Boil the liquid refrigerant out ot the oil within the crankcase
Yes

4. How many cfm per ton?
8
45 degrees F
400
15% silphos

5. What are the two ways that fresh air enters a structure?
It will be high
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Infiltration and ventilation
TXV

6. Superheat should never be below how many degrees
With an are rating
Rise
140 degrees F
5 degrees

7. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
A piston type metering device
With a minimum of three evenly spaced self-tapping screws
Yes

8. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
30-35 degrees above ambient
Any amount
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

9. Why are some ACR tubing lines insulated?
In parallel
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Any amount
Side-by-side and over-and-under

10. What kind of refrigeratnts must be added in liquid form?
Below 800 degrees F
Before the vent
Blended refrigerants
Outside of the male fitting

11. Most duct insulation is made of what?
Fiberglass
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws
Inches of water column (in. WC)

12. If the rpm's are 1750 - how many poles does the motor have?
4
It will be high
Before the vent
400

13. What is the normal evaporator temperature?
45 degrees F
Stranded
Pull a vacuum
The takeoff fitting

14. How many BTU's per ton?
12000
Potential relay and start capacitor
A diffuser
When it is above a conditioned space

15. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
When it is above a conditioned space
Negative
Boil the liquid refrigerant out ot the oil within the crankcase
A bypass duct or a dump zone

16. At what temperature does refrigerant condense in a standard-efficiency unit?
400
Potential relay and start capacitor
8-12 degrees F
30-35 degrees above ambient

17. What kind of copper tubing is used for refrigeration or air-conditioning applications?
To remove humidity and lower dry bulb temperature
Standard
ACR (air-conditioning refrigeration) tubing
6

18. Do you need a vent on a push-through evaporator?
They are larger
Rise
In parallel
Yes

19. What sort of pressure will a pull-through evaporator have?
Negative
Pull a vacuum
45-55%
Subtract ambient temperature from 100

20. How do you calculate cfm?

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21. When do you install an auxillary drain pan?
When it is above a conditioned space
With a minimum of three evenly spaced self-tapping screws
Any amount
Individual return air systems and central return air systems

22. 10' round duct has a ballpark cfm of what?
400
15 A
Pull a vacuum
Vapor

23. The evaporator is designed to remove what two types of heat?
With an are rating
RLA/FLA x 5
Latent and sensible
In parallel

24. How many amps can 14 g wire handle?
15 A
1/4'
True
Heat load

25. How many amps can 12 g wire handle?
20 A
Slugging
It rises
A piston type metering device

26. The A/C size is calculated by what?
Heat load
A dirty evaporator
105 degrees F
100

27. At what temperature does refrigerant condense in a high-efficiency unit?
Inside diameter (ID)
20 degrees above ambient
8-12 degrees F
TXV

28. If the rpm's are 1050 - how many poles does the motor have?
6
Common
False
5 degrees

29. Most duct insulation is made of what?
A piston type metering device
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Outside diameter (OD)
Fiberglass

30. How is ACR tubing sized?
When it is a pull-through evaporator
Outside diameter (OD)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
True

31. What is the difference between SEER and EER?
Yes
400
SEER includes the energy used in the start-up and shut-down cycles
Yes

32. What are the two types of package units?
Side-by-side and over-and-under
20 A
Staples and tape
400

33. What are the four materials used to make duct?
L-type
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

34. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
TXV
Negative
A dirty evaporator

35. What are the components of a hard-start kit?
The suction line or the low-pressure side
It rises
4
Potential relay and start capacitor

36. The compressor is cooled by liquid refrigerant. (True of False)
Fiberglass
Latent and sensible
It also rises
False

37. What do you do after you braze a system?
S-clips and drives (cleats)
Pull a vacuum
It will have a decrease in superheat
To lower the amount of pressure drop through the coil

38. If the rpm's are 3450 - how many poles does the motor have?
Inside diameter (ID)
L-type
300
2

39. The furnace size is calculated by what?
Heat loss
Over 800 degrees F
A bypass duct or a dump zone
Duct - electrical - and mechanical

40. How is nominal-sized tubing sized?
Inside diameter (ID)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
15% silphos
ACR (air-conditioning refrigeration) tubing

41. Where do you apply flux when soldering?
45-55%
Heat load
Outside of the male fitting
A swaging tool

42. How will too much refrigerant effect superheat?
30-35 degrees above ambient
When it is a pull-through evaporator
It will be low
Subtract ambient temperature from 100

43. The fan switch opens at what temperature?
High
200
A diffuser
105 degrees F

44. What kind of metering device do high-efficiency units usually use?
TXV
140 degrees F
100 psig
8-12 degrees F

45. What kind of metering device do high-efficiency units usually use?
TXV
They are larger
Inside diameter (ID)
Duct with insulation on the inside

46. What are the two types of return air systems in residential installations?
ACR (air-conditioning refrigeration) tubing
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Shorted winding - open winding - and grounded winding
Individual return air systems and central return air systems

47. Which is more efficient - a TXV or a fixed-orifice metering device?
Inches of water column (in. WC)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
TXV
Outside diameter (OD)

48. What gauge is thermostat wire?
To remove humidity and lower dry bulb temperature
2
18 gauge
L-type

49. Which is more efficient - a TXV or a fixed-orifice metering device?
40 degrees F
Average feet per minute X area in square feet (H' x W'/144)
45-55%
TXV

50. When do you install an auxillary drain pan?
When it is above a conditioned space
A dirty evaporator
The takeoff fitting
Heat loss