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

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2. What kind of refrigeratnts must be added in liquid form?
2
Belt drive and direct drive
Yes
Blended refrigerants

3. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Yes
45-55%
2

4. At what temperature does refrigerant condense in a standard-efficiency unit?
2
RLA/FLA x 5
30-35 degrees above ambient
Heat loss

5. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Vapor
To lower the amount of pressure drop through the coil
Suction
20 A

6. How does ACR copper pipe come?
45-55%
No
To lower the amount of pressure drop through the coil
Dehydrated with caps on each end

7. Does a package unit come from the factory pre-charged?
100
S-clips and drives (cleats)
Yes
Fiberglass

8. What do you do after you braze a system?
Pull a vacuum
Static pressure - velocity pressure - and total pressure
A swaging tool
Vapor

9. The evaporator is designed to remove what two types of heat?
12000
Yes
Latent and sensible
15 A

10. 7' round duct has a ballpark cfm of what?
150
High
15% silphos
Inches of water column (in. WC)

11. 10' round duct has a ballpark cfm of what?
Pistons
400
Standard
When it is a pull-through evaporator

12. The furnace size is calculated by what?
High
Heat loss
Over 800 degrees F
Subtract ambient temperature from 100

13. Do you need a vent on a pull-through evaporator?
45-55%
Suction
Yes
In parallel

14. In what length rolls is soft copper tubing normally available?
ACR (air-conditioning refrigeration) tubing
Compressor
25-ft or 50-ft
Yes

15. How many cfm per ton?
Yes
Stranded
ACR (air-conditioning refrigeration) tubing
400

16. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Yes
Inside diameter (ID)
Vapor
30 degrees F

17. 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
SEER includes the energy used in the start-up and shut-down cycles
Average feet per minute X area in square feet (H' x W'/144)
100

18. What are the three crafts normally associated with an air-conditioned installation?
30 A
Positive
Duct - electrical - and mechanical
Outside of the male fitting

19. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
Nominal-sized tubing
30-35 degrees above ambient
Staples and tape

20. A reciprocating compressor has what sort of moving parts?
Over 800 degrees F
Slugging
Pistons
Individual return air systems and central return air systems

21. What is the range for normal superheat and subcooling?
8-12 degrees F
Static pressure - velocity pressure - and total pressure
A bypass duct or a dump zone
RLA/FLA x 5

22. Where is insulation used on copper tubing used for air-conditioning?
Slugging
20 A
40 degrees F
The suction line or the low-pressure side

23. What distributes supply air to a room in a structure?
18 gauge
A diffuser
100
Rise

24. What are the two types of package units?
Side-by-side and over-and-under
Vapor
140 degrees F
In parallel

25. What is the difference between SEER and EER?
Outside of the male fitting
SEER includes the energy used in the start-up and shut-down cycles
A bypass duct or a dump zone
To lower the amount of pressure drop through the coil

26. At what temperature will soft solder melt?
They are larger
Below 800 degrees F
1/4'
High

27. What is it called when liquid refrigerant gets into the compressor?
Slugging
Inches of water column (in. WC)
15 A
Any amount

28. Where do you check the amps on a motor?
On the common terminal
They are larger
Inches of water column (in. WC)
12000

29. Superheat should never be below how many degrees
5 degrees
Pistons
Below 800 degrees F
It will have a decrease in superheat

30. Sections of duct board can be fastened together with what?
100 psig
Staples and tape
RLA/FLA x 5
L-type

31. The compressor is cooled by liquid refrigerant. (True of False)
Duct - electrical - and mechanical
False
TXV
Yes

32. How many amps can 8 g wire handle?
40 A
Inches of water column (in. WC)
RLA/FLA x 5
High

33. If the rpm's are 3450 - how many poles does the motor have?
Pull a vacuum
High
2
140 degrees F

34. What are the four materials used to make duct?
Yes
15% silphos
Pistons
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

35. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Yes
True
30 degrees F
20 degrees F

36. What percentage silver do you need to use for an are-410 system?
15% silphos
Pistons
400
8

37. Where do you apply flux when soldering?
A piston type metering device
Duct with insulation on the inside
40 degrees F
Outside of the male fitting

38. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
2 minutes
Individual return air systems and central return air systems
Common

39. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
TXV
No
In series
45-55%

40. What kind of refrigeratnts must be added in liquid form?
12000
400
Blended refrigerants
It rises

41. How do you achieve high-efficiency?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
2 minutes
By increasing the surface of the condenser coil
12000

42. Does a package unit come from the factory pre-charged?
When it is above a conditioned space
Yes
Outside diameter (OD)
2 minutes

43. At what temperature will brazing melt?
Nominal-sized tubing
Over 800 degrees F
Yes
200

44. What are the two types of return air systems in residential installations?
Potential relay and start capacitor
Individual return air systems and central return air systems
Yes
RLA/FLA x 5

45. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
100
Pull a vacuum
A band 4 inches or more in width

46. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Btu/hr (output) / wattage (input)
Yes
ACR (air-conditioning refrigeration) tubing
On the common terminal

47. The furnace size is calculated by what?
Staples and tape
Heat loss
Duct - electrical - and mechanical
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

48. What is the name of the fitting where the branch line leaves the duct?
40 A
150
Positive
The takeoff fitting

49. What is considered normal operating conditions?
L-type
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
40 degrees F

50. On what terminal do you check amperage?
The takeoff fitting
Common
400
Nominal-sized tubing