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 are the components of a hard-start kit?
Inches of water column (in. WC)
They are larger
30 degrees F
Potential relay and start capacitor

2. The A/C size is calculated by what?
Heat load
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Negative
Yes

3. How is ACR tubing sized?
Outside diameter (OD)
Heat load
Staples and tape
Individual return air systems and central return air systems

4. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
A swaging tool
On the common terminal
Any amount
To lower the amount of pressure drop through the coil

5. What are the two basic duct connection configurations for package units supply and return air ducts?
20 A
Over/under and side by side
Pistons
No

6. What are the components of a hard-start kit?
8-12 degrees F
Potential relay and start capacitor
With 4' saddles
A bypass duct or a dump zone

7. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
It will have a decrease in superheat
20 A
Latent and sensible

8. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
It will be low
40 degrees F
Inside diameter (ID)

9. What kind of refrigeratnts must be added in liquid form?
Subtract ambient temperature from 100
Blended refrigerants
Fiberglass
Rise

10. How is flexible duct supported?
It rises
On the common terminal
A band 4 inches or more in width
Staples and tape

11. When must a copper joint never be soldered or brazed?
It rises
When the system is under pressure
False
With an are rating

12. What are normal conditions - as defined by the ARI.
Side-by-side and over-and-under
Inside diameter (ID)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Compressor

13. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
SEER includes the energy used in the start-up and shut-down cycles
When it is above a conditioned space
45-55%
Nominal-sized tubing

14. What sort of pressure will a push-through evaporator have?
150
40 A
20 A
Positive

15. What are the two types of blower drives?
Yes
Yes
Yes
Belt drive and direct drive

16. How do you calculate the area of a circle?
Pi x radius squared
Before the vent
Yes
Negative

17. What do you use to check for leaks?
Rise
8
ACR (air-conditioning refrigeration) tubing
Nitrogen with a small amount of refrigerant

18. The compressor is cooled by liquid refrigerant. (True of False)
It also rises
False
Any amount
Static pressure - velocity pressure - and total pressure

19. The A/C size is calculated by what?
Inclined manometer
Static pressure - velocity pressure - and total pressure
On the common terminal
Heat load

20. 10 SEER is classified as what kind of efficiency?
Standard
Potential relay and start capacitor
140 degrees F
Yes

21. Which type of wire can handle a higher ampacity?
400
Slugging
25-ft or 50-ft
Stranded

22. What percentage silver do you need to use for an are-410 system?
20 degrees above ambient
Pull a vacuum
Side-by-side and over-and-under
15% silphos

23. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
With an are rating
True
They are physically larger
A piston type metering device

24. If the rpm's are 1050 - how many poles does the motor have?
In parallel
Yes
Duct with insulation on the inside
6

25. What is lined duct?
Outside of the male fitting
Nominal-sized tubing
Stranded
Duct with insulation on the inside

26. How many amps can 10 g wire handle?
Fiberglass
Side-by-side and over-and-under
Compressor
30 A

27. What kind of copper tubing is used for refrigeration or air-conditioning applications?
8-12 degrees F
Infiltration and ventilation
ACR (air-conditioning refrigeration) tubing
Dehydrated with caps on each end

28. What is a package unit?
Stranded
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
It rises
Latent and sensible

29. The furnace size is calculated by what?
When it is above a conditioned space
Heat loss
Yes
Any amount

30. How are round ducts supported?

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31. How many amps can 8 g wire handle?
40 A
False
40 degrees F
No

32. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
20 degrees above ambient
Over 800 degrees F
Heat loss

33. How many amps can 12 g wire handle?
45-55%
20 A
Blended refrigerants
When the system is under pressure

34. How many BTU's per ton?
No
Outside diameter (OD)
False
12000

35. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
It also rises
It rises
20 degrees above ambient

36. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
100
20 degrees F
True
300

37. How long should you leave a system off once you kill power before restarting it?
2 minutes
They are physically larger
200
It will be low

38. 7' round duct has a ballpark cfm of what?
When it is a pull-through evaporator
Individual return air systems and central return air systems
105 degrees F
150

39. How are round ducts connected to one another?
5 degrees
With a minimum of three evenly spaced self-tapping screws
200
RLA/FLA x 5

40. How will too much refrigerant effect subcooling?
20 degrees above ambient
Compressor
Pull a vacuum
It will be high

41. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
It will have a decrease in superheat
Static pressure - velocity pressure - and total pressure
Duct with insulation on the inside

42. How are round ducts supported?

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43. What sort of pressure will a pull-through evaporator have?
In series
Negative
They are larger
Yes

44. If the rpm's are 750 - how many poles does the motor have?
Subtract ambient temperature from 100
Outside of the male fitting
Inclined manometer
8

45. What kind of copper tubing is used for plumbing and heating applications?
4
Pull a vacuum
100
Nominal-sized tubing

46. If the suction pressure rises - what happens to the head pressure?
The suction line or the low-pressure side
Yes
It also rises
Vapor

47. How is the high pressure switch wired with the low pressure switch?
In parallel
Dehydrated with caps on each end
ACR (air-conditioning refrigeration) tubing
140 degrees F

48. How many amps can 8 g wire handle?
40 A
Yes
Yes
45 degrees F

49. 6' round duct has a ballpark cfm of what?
100
Over/under and side by side
Blended refrigerants
Vapor

50. A reciprocating compressor has what sort of moving parts?
Pistons
It will be low
12000
False