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. The A/C size is calculated by what?
Yes
Heat load
Positive
2

2. What kind of copper tubing is used for plumbing and heating applications?
It also rises
Nominal-sized tubing
Average feet per minute X area in square feet (H' x W'/144)
Yes

3. What are the two functions of the air-conditioning system?
SEER includes the energy used in the start-up and shut-down cycles
To remove humidity and lower dry bulb temperature
30-35 degrees above ambient
40 degrees F

4. The compressor is cooled by liquid refrigerant. (True of False)
40 A
Stranded
False
A bypass duct or a dump zone

5. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Shorted winding - open winding - and grounded winding
Outside of the male fitting
They are physically larger
2 minutes

6. How is the high pressure switch wired with the low pressure switch?
SEER includes the energy used in the start-up and shut-down cycles
Belt drive and direct drive
In parallel
1/4'

7. How is nominal-sized tubing sized?
Over 800 degrees F
Inside diameter (ID)
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Staples and tape

8. What gauge is thermostat wire?
Belt drive and direct drive
Vapor
18 gauge
In series

9. 10' round duct has a ballpark cfm of what?
TXV
It rises
400
25-ft or 50-ft

10. 13 SEER is classified as what kind of efficiency?
Average feet per minute X area in square feet (H' x W'/144)
A band 4 inches or more in width
High
Average feet per minute X area in square feet (H' x W'/144)

11. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
On the common terminal
Any amount
Pistons

12. What is used to measure static air pressure in ducts.
Heat loss
Dehydrated with caps on each end
Side-by-side and over-and-under
Inclined manometer

13. Where do you check the amps on a motor?
On the common terminal
S-clips and drives (cleats)
Rise
To lower the amount of pressure drop through the coil

14. How do you calculate ballpark superheat?
30 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It will have a decrease in superheat
Subtract ambient temperature from 100

15. What kind of metering device do high-efficiency units usually use?
A band 4 inches or more in width
TXV
200
Stranded

16. The evaporator is designed to remove what two types of heat?
Latent and sensible
400
Positive
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

17. Can refrigerant line sets be altered in length?
It will be low
Inches of water column (in. WC)
Yes
Rise

18. If the rpm's are 1050 - how many poles does the motor have?
6
20 A
Outside of the male fitting
S-clips and drives (cleats)

19. If pressure rises - what happens to the superheat?
Average feet per minute X area in square feet (H' x W'/144)
Latent and sensible
A diffuser
It rises

20. Do you need a vent on a pull-through evaporator?
Heat loss
Yes
The takeoff fitting
2 minutes

21. What is lined duct?
Yes
Nitrogen with a small amount of refrigerant
Individual return air systems and central return air systems
Duct with insulation on the inside

22. What are the two functions of the air-conditioning system?
With 4' saddles
Shorted winding - open winding - and grounded winding
Compressor
To remove humidity and lower dry bulb temperature

23. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
With 4' saddles
Indoor fan motor - outdoor fan motor - and the compressor
A bypass duct or a dump zone
High

24. What are the two basic duct connection configurations for package units supply and return air ducts?
Slugging
8
Over/under and side by side
6

25. Do you need a trap on a push-through evaporator?
S-clips and drives (cleats)
No
Shorted winding - open winding - and grounded winding
Dehydrated with caps on each end

26. How many amps can 8 g wire handle?
Inside diameter (ID)
40 A
Dehydrated with caps on each end
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

27. How will too much refrigerant effect superheat?
L-type
Inclined manometer
It will be low
In parallel

28. What is lined duct?
Duct with insulation on the inside
15 A
Fiberglass
4

29. How does ACR copper pipe come?
Inches of water column (in. WC)
Dehydrated with caps on each end
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
20 A

30. Does a package unit come from the factory pre-charged?
Pull a vacuum
Yes
S-clips and drives (cleats)
Pull a vacuum

31. What do you use to connect square and rectangular ductboard together?
Standard
Staples and tape
S-clips and drives (cleats)
A piston type metering device

32. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
200
6
Common

33. If pressure rises - what happens to the superheat?
It rises
It will be low
Yes
ACR (air-conditioning refrigeration) tubing

34. How many amps can 14 g wire handle?
Yes
4
300
15 A

35. Which type of wire can handle a higher ampacity?
300
Stranded
12000
To lower the amount of pressure drop through the coil

36. 9' round duct has a ballpark cfm of what?
They are physically larger
300
Inside diameter (ID)
Rise

37. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
Slugging
Inches of water column (in. WC)
Yes

38. Do you need a vent on a pull-through evaporator?
TXV
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
Compressor

39. How are round ducts connected to one another?
The takeoff fitting
With a minimum of three evenly spaced self-tapping screws
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
200

40. At what temperature does refrigerant condense in a standard-efficiency unit?
Infiltration and ventilation
100 psig
20 A
30-35 degrees above ambient

41. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Heat load
15% silphos
In series
2 minutes

42. When do you install a trap on a drain line?
Over/under and side by side
When it is a pull-through evaporator
15% silphos
25-ft or 50-ft

43. How will too much refrigerant effect superheat?
Any amount
It will be low
On the common terminal
Latent and sensible

44. Sections of duct board can be fastened together with what?
Staples and tape
Over 800 degrees F
40 degrees F
Fiberglass

45. What kind of copper tubing is used for refrigeration or air-conditioning applications?
It will be high
ACR (air-conditioning refrigeration) tubing
8-12 degrees F
2

46. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
Compressor
Nominal-sized tubing
140 degrees F

47. What distributes supply air to a room in a structure?
RLA/FLA x 5
A diffuser
A swaging tool
The takeoff fitting

48. What are the three crafts normally associated with an air-conditioned installation?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Duct - electrical - and mechanical
18 gauge
30-35 degrees above ambient

49. How many amps can 10 g wire handle?
Nitrogen with a small amount of refrigerant
30 A
L-type
Belt drive and direct drive

50. If the rpm's are 1750 - how many poles does the motor have?
Duct - electrical - and mechanical
6
4
Staples and tape