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. Superheat should never be below how many degrees
Vapor
5 degrees
30 A
With 4' saddles

2. The fan switch closes at what temperature?
Heat loss
140 degrees F
Potential relay and start capacitor
150

3. How is ACR tubing sized?
It will be low
Shorted winding - open winding - and grounded winding
100 psig
Outside diameter (OD)

4. What are the three crafts normally associated with an air-conditioned installation?
Inclined manometer
Duct - electrical - and mechanical
S-clips and drives (cleats)
False

5. What are the components of a hard-start kit?
45 degrees F
ACR (air-conditioning refrigeration) tubing
5 degrees
Potential relay and start capacitor

6. In what state is the refrigerant in the compressor?
High
When it is above a conditioned space
Common
Vapor

7. At what temperature will soft solder melt?
Below 800 degrees F
Heat loss
Slugging
No

8. The compressor is cooled by liquid refrigerant. (True of False)
30 degrees F
False
Side-by-side and over-and-under
Indoor fan motor - outdoor fan motor - and the compressor

9. What are the two types of blower drives?
Common
With an are rating
400
Belt drive and direct drive

10. What type of air conditioning system must be charged using the superheat method?
Positive
A piston type metering device
Pull a vacuum
Pi x radius squared

11. What kind of copper tubing is used for plumbing and heating applications?
25-ft or 50-ft
Nominal-sized tubing
False
Yes

12. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Yes
They are physically larger
In parallel
20 A

13. If the suction pressure rises - what happens to the head pressure?
6
40 degrees F
It also rises
400

14. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Compressor
A piston type metering device
30-35 degrees above ambient
40 degrees F

15. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
45 degrees F
20 degrees F
Heat load
Pistons

16. Do you need a vent on a pull-through evaporator?
Outside diameter (OD)
Yes
Fiberglass
15% silphos

17. Do you need a trap on a push-through evaporator?
25-ft or 50-ft
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
No
When it is a pull-through evaporator

18. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
15% silphos
Side-by-side and over-and-under
Any amount
RLA/FLA x 5

19. Where do you apply flux when soldering?
Side-by-side and over-and-under
Outside of the male fitting
They are larger
Fiberglass

20. What is used to measure static air pressure in ducts.
8-12 degrees F
Nitrogen with a small amount of refrigerant
140 degrees F
Inclined manometer

21. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
150
Compressor
5 degrees

22. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
4
140 degrees F
With a minimum of three evenly spaced self-tapping screws
20 degrees F

23. Sections of duct board can be fastened together with what?
Before the vent
140 degrees F
Staples and tape
40 A

24. How many BTU's per ton?
12000
Nominal-sized tubing
Duct - electrical - and mechanical
Positive

25. If the suction pressure rises - what happens to the head pressure?
2
It also rises
TXV
15 A

26. What kind of copper tubing is used for refrigeration or air-conditioning applications?
8
2 minutes
ACR (air-conditioning refrigeration) tubing
Yes

27. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
No
Inside diameter (ID)
They are larger

28. What kind of refrigeratnts must be added in liquid form?
30 A
Blended refrigerants
It will be low
2

29. The load on the evaporater will effect which pressure?
Suction
Belt drive and direct drive
True
S-clips and drives (cleats)

30. What do you use to check for leaks?
Positive
Nitrogen with a small amount of refrigerant
Rise
Shorted winding - open winding - and grounded winding

31. How are round ducts connected to one another?
With an are rating
100 psig
40 degrees F
With a minimum of three evenly spaced self-tapping screws

32. How is the high pressure switch wired with the low pressure switch?
Nominal-sized tubing
Pi x radius squared
400
In parallel

33. Pressure in ductwork is measured In what?
Outside of the male fitting
Inches of water column (in. WC)
High
Duct - electrical - and mechanical

34. Can refrigerant line sets be altered in length?
Inches of water column (in. WC)
2
High
Yes

35. If the rpm's are 750 - how many poles does the motor have?
True
S-clips and drives (cleats)
8
L-type

36. What is the name of the fitting where the branch line leaves the duct?
When the system is under pressure
RLA/FLA x 5
The takeoff fitting
Below 800 degrees F

37. The evaporator is designed to remove what two types of heat?
Before the vent
Blended refrigerants
Negative
Latent and sensible

38. What are the two types of blower drives?
Latent and sensible
Belt drive and direct drive
Standard
15% silphos

39. What is considered normal operating conditions?
Fiberglass
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
6
400

40. On what terminal do you check amperage?
150
With an are rating
Fiberglass
Common

41. How are round ducts supported?

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42. The fan switch closes at what temperature?
100 psig
Latent and sensible
140 degrees F
Heat load

43. Why are some ACR tubing lines insulated?
It will be high
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
300
Average feet per minute X area in square feet (H' x W'/144)

44. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
30 degrees F
40 degrees F
Pi x radius squared
L-type

45. If the rpm's are 1050 - how many poles does the motor have?
30 A
Duct with insulation on the inside
6
Subtract ambient temperature from 100

46. What are the two types of return air systems in residential installations?
Slugging
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Individual return air systems and central return air systems

47. What is the typical pressure differance across a TXV?
100 psig
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws
In parallel

48. What kind of copper tubing is used for refrigeration or air-conditioning applications?
On the common terminal
25-ft or 50-ft
ACR (air-conditioning refrigeration) tubing
30 A

49. The fan switch opens at what temperature?
With 4' saddles
Yes
105 degrees F
Inside diameter (ID)

50. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
Below 800 degrees F
They are larger
30 A