Test your basic knowledge |

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 it called when liquid refrigerant gets into the compressor?
False
Heat loss
15 A
Slugging

2. What distributes supply air to a room in a structure?
A diffuser
To remove humidity and lower dry bulb temperature
40 degrees F
Yes

3. Superheat should never be below how many degrees
When it is a pull-through evaporator
On the common terminal
5 degrees
Any amount

4. What is the difference between SEER and EER?
High
A diffuser
SEER includes the energy used in the start-up and shut-down cycles
Heat load

5. How many amps can 8 g wire handle?
40 A
Yes
A piston type metering device
5 degrees

6. How are round ducts supported?

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

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8. Superheat should never be below how many degrees
ACR (air-conditioning refrigeration) tubing
5 degrees
12000
Any amount

9. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It will have a decrease in superheat
It will be low
100 psig

10. How many amps can 14 g wire handle?
15 A
Yes
Shorted winding - open winding - and grounded winding
Yes

11. What kind of metering device do high-efficiency units usually use?
TXV
Vapor
Fiberglass
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

12. The evaporator is designed to remove what two types of heat?
Latent and sensible
High
Duct - electrical - and mechanical
RLA/FLA x 5

13. What is used to measure static air pressure in ducts.
Inclined manometer
25-ft or 50-ft
It rises
Staples and tape

14. In what state is the refrigerant in the compressor?
30 degrees F
200
Vapor
12000

15. How do you calculate ballpark superheat?
Compressor
15 A
Subtract ambient temperature from 100
Yes

16. How does ACR copper pipe come?
Inclined manometer
Dehydrated with caps on each end
Yes
Individual return air systems and central return air systems

17. What kind of refrigeratnts must be added in liquid form?
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants
A diffuser
Dehydrated with caps on each end

18. What are the two types of package units?
By increasing the surface of the condenser coil
RLA/FLA x 5
Latent and sensible
Side-by-side and over-and-under

19. What is lined duct?
Rise
Duct with insulation on the inside
15% silphos
They are physically larger

20. 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
Duct - electrical - and mechanical
Inches of water column (in. WC)
When it is a pull-through evaporator

21. What is the design boiling point for most evaporator coils in residential air conditioning?
RLA/FLA x 5
On the common terminal
40 degrees F
When it is a pull-through evaporator

22. How do you achieve high-efficiency?
Fiberglass
They are larger
By increasing the surface of the condenser coil
The suction line or the low-pressure side

23. What sort of pressure will a push-through evaporator have?
Positive
200
When it is a pull-through evaporator
L-type

24. How will too much refrigerant effect subcooling?
It will be high
Stranded
20 A
Static pressure - velocity pressure - and total pressure

25. How is insulation around a duct rated?
The takeoff fitting
With an are rating
It also rises
Infiltration and ventilation

26. Why are some ACR tubing lines insulated?
140 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
8
Negative

27. Pressure in ductwork is measured In what?
It will be high
40 degrees F
100
Inches of water column (in. WC)

28. At what temperature does refrigerant condense in a high-efficiency unit?
With a minimum of three evenly spaced self-tapping screws
Subtract ambient temperature from 100
Fiberglass
20 degrees above ambient

29. 10' round duct has a ballpark cfm of what?
Negative
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
400
In parallel

30. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
No
45 degrees F
They are physically larger

31. How is the high pressure switch wired with the low pressure switch?
8
30 A
In parallel
100

32. 10' round duct has a ballpark cfm of what?
18 gauge
It will be high
ACR (air-conditioning refrigeration) tubing
400

33. The fan switch opens at what temperature?
In parallel
200
105 degrees F
Standard

34. What is the difference between SEER and EER?
Pull a vacuum
It will have a decrease in superheat
Dehydrated with caps on each end
SEER includes the energy used in the start-up and shut-down cycles

35. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Any amount
12000
45-55%
300

36. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Duct with insulation on the inside
ACR (air-conditioning refrigeration) tubing
A swaging tool
400

37. If the rpm's are 750 - how many poles does the motor have?
Pistons
Blended refrigerants
With a minimum of three evenly spaced self-tapping screws
8

38. What do you use to check for leaks?
Inside diameter (ID)
25-ft or 50-ft
Nitrogen with a small amount of refrigerant
Pull a vacuum

39. Do you need a vent on a pull-through evaporator?
In parallel
Belt drive and direct drive
Yes
Inches of water column (in. WC)

40. Do you need a trap on a pull-through evaporator?
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
140 degrees F
5 degrees

41. At what temperature will soft solder melt?
Static pressure - velocity pressure - and total pressure
40 degrees F
Latent and sensible
Below 800 degrees F

42. Most duct insulation is made of what?
Fiberglass
A dirty evaporator
Heat load
No

43. What are the components of a hard-start kit?
When it is a pull-through evaporator
105 degrees F
Potential relay and start capacitor
A dirty evaporator

44. If the rpm's are 3450 - how many poles does the motor have?
Yes
15 A
They are larger
2

45. The fan switch closes at what temperature?
When the system is under pressure
They are larger
140 degrees F
Staples and tape

46. How long should you leave a system off once you kill power before restarting it?
Potential relay and start capacitor
They are physically larger
2 minutes
When the system is under pressure

47. The compressor is cooled by liquid refrigerant. (True of False)
False
Individual return air systems and central return air systems
Potential relay and start capacitor
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

48. What do you use to connect square and rectangular ductboard together?
It rises
S-clips and drives (cleats)
Boil the liquid refrigerant out ot the oil within the crankcase
400

49. How do you calculate EER?
Dehydrated with caps on each end
To remove humidity and lower dry bulb temperature
Negative
Btu/hr (output) / wattage (input)

50. When must a copper joint never be soldered or brazed?
40 degrees F
12000
When the system is under pressure
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity