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. On what terminal do you check amperage?
In parallel
Compressor
Common
They are physically larger

2. How is ACR tubing sized?
Positive
Inches of water column (in. WC)
4
Outside diameter (OD)

3. In what length rolls is soft copper tubing normally available?
Potential relay and start capacitor
Duct - electrical - and mechanical
25-ft or 50-ft
Stranded

4. What kind of copper tubing is used for plumbing and heating applications?
40 degrees F
Over/under and side by side
Suction
Nominal-sized tubing

5. What is the difference between SEER and EER?
Yes
False
SEER includes the energy used in the start-up and shut-down cycles
Individual return air systems and central return air systems

6. How are the condenser coils different on a high-efficiency unit?
They are larger
SEER includes the energy used in the start-up and shut-down cycles
Positive
Nitrogen with a small amount of refrigerant

7. What are the two types of blower drives?
Inside diameter (ID)
Belt drive and direct drive
Yes
Latent and sensible

8. 13 SEER is classified as what kind of efficiency?
High
20 degrees above ambient
105 degrees F
With a minimum of three evenly spaced self-tapping screws

9. Do you need a trap on a push-through evaporator?
No
Outside diameter (OD)
4
2

10. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
A bypass duct or a dump zone
Over 800 degrees F
A bypass duct or a dump zone

11. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
TXV
Positive

12. How is ACR tubing sized?
Outside diameter (OD)
Dehydrated with caps on each end
A swaging tool
No

13. How do you calculate cfm?

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14. 7' round duct has a ballpark cfm of what?
12000
150
By increasing the surface of the condenser coil
Potential relay and start capacitor

15. How many amps can 12 g wire handle?
Outside of the male fitting
In series
20 A
The takeoff fitting

16. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
20 degrees above ambient
Any amount
100
25-ft or 50-ft

17. What are the three crafts normally associated with an air-conditioned installation?
The takeoff fitting
Below 800 degrees F
Inside diameter (ID)
Duct - electrical - and mechanical

18. 10' round duct has a ballpark cfm of what?
Yes
400
Dehydrated with caps on each end
1/4'

19. Sections of duct board can be fastened together with what?
Standard
Heat loss
Staples and tape
TXV

20. 10 SEER is classified as what kind of efficiency?
Duct - electrical - and mechanical
Indoor fan motor - outdoor fan motor - and the compressor
Standard
Belt drive and direct drive

21. Do you need a vent on a push-through evaporator?
105 degrees F
Yes
30 degrees F
45-55%

22. How many amps can 8 g wire handle?
In parallel
Compressor
40 A
Dehydrated with caps on each end

23. How will too much refrigerant effect superheat?
Duct - electrical - and mechanical
400
200
It will be low

24. What sort of pressure will a pull-through evaporator have?
It rises
Negative
Rise
Compressor

25. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Common
To lower the amount of pressure drop through the coil
400
With an are rating

26. Most duct insulation is made of what?
It will have a decrease in superheat
Fiberglass
20 A
Individual return air systems and central return air systems

27. At what temperature will brazing melt?
Fiberglass
Any amount
Dehydrated with caps on each end
Over 800 degrees F

28. What is lined duct?
Duct with insulation on the inside
30 A
Negative
Inside diameter (ID)

29. If the rpm's are 750 - how many poles does the motor have?
25-ft or 50-ft
30 degrees F
8
Individual return air systems and central return air systems

30. What are the three pressures created by moving air in ductwork?
False
Heat loss
With a minimum of three evenly spaced self-tapping screws
Static pressure - velocity pressure - and total pressure

31. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
A diffuser
A piston type metering device
Rise

32. How will too much refrigerant effect subcooling?
Pi x radius squared
It will be high
Static pressure - velocity pressure - and total pressure
Inside diameter (ID)

33. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
18 gauge
200
Side-by-side and over-and-under

34. The evaporator is designed to remove what two types of heat?
Latent and sensible
Indoor fan motor - outdoor fan motor - and the compressor
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Slugging

35. What kind of refrigeratnts must be added in liquid form?
400
Below 800 degrees F
Inclined manometer
Blended refrigerants

36. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Pull a vacuum
40 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
False

37. If the rpm's are 1050 - how many poles does the motor have?
6
Fiberglass
20 degrees F
40 degrees F

38. 8' round duct has a ballpark cfm of what?
Nitrogen with a small amount of refrigerant
Average feet per minute X area in square feet (H' x W'/144)
30 A
200

39. At what temperature does refrigerant condense in a standard-efficiency unit?
When the system is under pressure
It will be high
Latent and sensible
30-35 degrees above ambient

40. What are the two types of blower drives?
Belt drive and direct drive
Standard
Staples and tape
A diffuser

41. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Btu/hr (output) / wattage (input)
20 degrees F
S-clips and drives (cleats)
When it is a pull-through evaporator

42. At what temperature will soft solder melt?
Below 800 degrees F
Any amount
When it is a pull-through evaporator
Belt drive and direct drive

43. How do you calculate LRA?
Inside diameter (ID)
Staples and tape
Indoor fan motor - outdoor fan motor - and the compressor
RLA/FLA x 5

44. A reciprocating compressor has what sort of moving parts?
Pistons
Potential relay and start capacitor
True
In series

45. How is flexible duct supported?
Latent and sensible
A band 4 inches or more in width
TXV
No

46. What kind of metering device do high-efficiency units usually use?
ACR (air-conditioning refrigeration) tubing
When it is a pull-through evaporator
TXV
It will be low

47. How do you calculate ballpark superheat?
Nitrogen with a small amount of refrigerant
2 minutes
Subtract ambient temperature from 100
2

48. Which is more efficient - a TXV or a fixed-orifice metering device?
RLA/FLA x 5
With 4' saddles
Over/under and side by side
TXV

49. How many cfm per ton?
400
No
Yes
30 degrees F

50. Where do you install a trap on a drain line?
Before the vent
20 degrees F
TXV
Side-by-side and over-and-under