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. If the rpm's are 1750 - how many poles does the motor have?
4
On the common terminal
200
True

2. Do you need a vent on a push-through evaporator?
45 degrees F
20 degrees F
Yes
Belt drive and direct drive

3. Where do you install a trap on a drain line?
45 degrees F
The suction line or the low-pressure side
Before the vent
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

4. 13 SEER is classified as what kind of efficiency?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Compressor
45-55%
High

5. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Stranded
Over/under and side by side
L-type
20 degrees F

6. What do you do after you braze a system?
45 degrees F
It will be high
20 degrees F
Pull a vacuum

7. How are round ducts connected to one another?
20 degrees above ambient
Nominal-sized tubing
False
With a minimum of three evenly spaced self-tapping screws

8. Why are some ACR tubing lines insulated?
It will be low
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
200
Over/under and side by side

9. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Indoor fan motor - outdoor fan motor - and the compressor
8-12 degrees F
Positive
L-type

10. In what state is the refrigerant in the compressor?
With a minimum of three evenly spaced self-tapping screws
Average feet per minute X area in square feet (H' x W'/144)
Vapor
It rises

11. How many amps can 8 g wire handle?
When it is above a conditioned space
40 A
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
30-35 degrees above ambient

12. What kind of copper tubing is used for plumbing and heating applications?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
No
Latent and sensible
Nominal-sized tubing

13. How do you calculate the area of a circle?
Nitrogen with a small amount of refrigerant
140 degrees F
Pi x radius squared
Yes

14. The compressor is cooled by liquid refrigerant. (True of False)
False
It will be high
With 4' saddles
Nitrogen with a small amount of refrigerant

15. If the suction pressure rises - what happens to the head pressure?
It also rises
Fiberglass
Inside diameter (ID)
Blended refrigerants

16. How many amps can 10 g wire handle?
Yes
30 A
A dirty evaporator
Blended refrigerants

17. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
When it is a pull-through evaporator
The takeoff fitting
40 degrees F
In series

18. How do you calculate ballpark superheat?
Nominal-sized tubing
Common
Shorted winding - open winding - and grounded winding
Subtract ambient temperature from 100

19. The evaporator is designed to remove what two types of heat?
Indoor fan motor - outdoor fan motor - and the compressor
It will be low
Latent and sensible
300

20. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
With an are rating
Nominal-sized tubing
Any amount
40 A

21. How are the condenser coils different on a high-efficiency unit?
40 degrees F
False
40 A
They are larger

22. The compressor is cooled by liquid refrigerant. (True of False)
False
Potential relay and start capacitor
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
SEER includes the energy used in the start-up and shut-down cycles

23. At what temperature will brazing melt?
It also rises
S-clips and drives (cleats)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Over 800 degrees F

24. What is the difference between SEER and EER?
Inside diameter (ID)
Yes
SEER includes the energy used in the start-up and shut-down cycles
20 A

25. How do you calculate cfm?

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26. How many amps can 12 g wire handle?
Side-by-side and over-and-under
High
20 A
Infiltration and ventilation

27. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
By increasing the surface of the condenser coil
40 A
To lower the amount of pressure drop through the coil
Positive

28. What is the normal evaporator temperature?
40 A
Potential relay and start capacitor
45 degrees F
Outside of the male fitting

29. How many amps can 14 g wire handle?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
15 A
True
TXV

30. Sections of duct board can be fastened together with what?
Infiltration and ventilation
40 degrees F
Potential relay and start capacitor
Staples and tape

31. If the suction pressure rises - what happens to the head pressure?
It also rises
RLA/FLA x 5
Outside of the male fitting
Nominal-sized tubing

32. How is insulation around a duct rated?
Vapor
With an are rating
140 degrees F
Any amount

33. How many amps can 14 g wire handle?
15 A
25-ft or 50-ft
150
Blended refrigerants

34. 9' round duct has a ballpark cfm of what?
Standard
The takeoff fitting
300
18 gauge

35. At what temperature does refrigerant condense in a standard-efficiency unit?
When it is a pull-through evaporator
20 degrees above ambient
300
30-35 degrees above ambient

36. Can refrigerant line sets be altered in length?
Duct - electrical - and mechanical
Inches of water column (in. WC)
Yes
When it is above a conditioned space

37. Why are some ACR tubing lines insulated?
Rise
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Latent and sensible
5 degrees

38. How many cfm per ton?
15 A
When it is above a conditioned space
400
False

39. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
It will have a decrease in superheat
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
True
Standard

40. At what temperature will soft solder melt?
Below 800 degrees F
With an are rating
15 A
15% silphos

41. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
A band 4 inches or more in width
6
Dehydrated with caps on each end

42. Will a dirty condenser cause a rise or fall in pressure?
Boil the liquid refrigerant out ot the oil within the crankcase
Over/under and side by side
Rise
They are larger

43. 8' round duct has a ballpark cfm of what?
200
L-type
Yes
With an are rating

44. What sort of pressure will a pull-through evaporator have?
S-clips and drives (cleats)
Blended refrigerants
Negative
Outside diameter (OD)

45. Can refrigerant line sets be altered in length?
Btu/hr (output) / wattage (input)
To remove humidity and lower dry bulb temperature
Indoor fan motor - outdoor fan motor - and the compressor
Yes

46. 6' round duct has a ballpark cfm of what?
2
100
Compressor
1/4'

47. At what temperature will soft solder melt?
TXV
A swaging tool
2
Below 800 degrees F

48. What are the two types of blower drives?
Belt drive and direct drive
A band 4 inches or more in width
4
6

49. What are the two types of package units?
SEER includes the energy used in the start-up and shut-down cycles
Outside of the male fitting
Side-by-side and over-and-under
Blended refrigerants

50. What are the two ways that fresh air enters a structure?
30 degrees F
A dirty evaporator
Individual return air systems and central return air systems
Infiltration and ventilation