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 are round ducts connected to one another?
Common
With a minimum of three evenly spaced self-tapping screws
It rises
To remove humidity and lower dry bulb temperature

2. Where do you install a trap on a drain line?
Nitrogen with a small amount of refrigerant
It also rises
With an are rating
Before the vent

3. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Over/under and side by side
A band 4 inches or more in width
Subtract ambient temperature from 100

4. What do you do after you braze a system?
Pistons
30 degrees F
Belt drive and direct drive
Pull a vacuum

5. When must a copper joint never be soldered or brazed?
20 degrees above ambient
SEER includes the energy used in the start-up and shut-down cycles
Inside diameter (ID)
When the system is under pressure

6. How long should you leave a system off once you kill power before restarting it?
2 minutes
15% silphos
They are larger
They are larger

7. 10 SEER is classified as what kind of efficiency?
Infiltration and ventilation
Standard
6
On the common terminal

8. When do you install an auxillary drain pan?
4
When it is above a conditioned space
30-35 degrees above ambient
SEER includes the energy used in the start-up and shut-down cycles

9. Will a dirty condenser cause a rise or fall in pressure?
Rise
105 degrees F
The takeoff fitting
1/4'

10. The fan switch opens at what temperature?
105 degrees F
Heat load
They are larger
A band 4 inches or more in width

11. The furnace size is calculated by what?
Heat loss
Standard
Outside diameter (OD)
Suction

12. The crankcase heater on an air-conditioning compressor is used to what?
1/4'
40 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
30 A

13. At what temperature will brazing melt?
In parallel
A swaging tool
Over 800 degrees F
40 degrees F

14. What are the two types of package units?
2 minutes
L-type
Standard
Side-by-side and over-and-under

15. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
Compressor
In series
Compressor

16. What are the components of a hard-start kit?
30-35 degrees above ambient
Potential relay and start capacitor
Pi x radius squared
Boil the liquid refrigerant out ot the oil within the crankcase

17. Where do you install a trap on a drain line?
20 A
Suction
Before the vent
30 degrees F

18. 13 SEER is classified as what kind of efficiency?
High
By increasing the surface of the condenser coil
It will be high
When it is a pull-through evaporator

19. What do you do after you braze a system?
Outside of the male fitting
Latent and sensible
Pull a vacuum
Indoor fan motor - outdoor fan motor - and the compressor

20. How will too much refrigerant effect subcooling?
It will be high
Over 800 degrees F
A piston type metering device
Yes

21. The fan switch closes at what temperature?
Inclined manometer
8
6
140 degrees F

22. What is the typical pressure differance across a TXV?
L-type
18 gauge
40 degrees F
100 psig

23. What is the normal evaporator temperature?
45 degrees F
1/4'
15 A
20 degrees F

24. How will too much refrigerant effect superheat?
It will be low
Outside of the male fitting
Inside diameter (ID)
False

25. If the rpm's are 1050 - how many poles does the motor have?
L-type
Common
6
Inches of water column (in. WC)

26. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
The takeoff fitting
They are physically larger
Compressor
40 degrees F

27. The A/C size is calculated by what?
It will be high
Boil the liquid refrigerant out ot the oil within the crankcase
Yes
Heat load

28. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
It will be high
105 degrees F
A swaging tool

29. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Potential relay and start capacitor
Suction
45-55%
With an are rating

30. How many amps can 10 g wire handle?
12000
30 A
Duct - electrical - and mechanical
Yes

31. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
25-ft or 50-ft
Potential relay and start capacitor
40 degrees F

32. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
Over/under and side by side
Below 800 degrees F
Yes

33. How does ACR copper pipe come?
No
Yes
Duct with insulation on the inside
Dehydrated with caps on each end

34. In what length rolls is soft copper tubing normally available?
Yes
25-ft or 50-ft
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
It will have a decrease in superheat

35. 10 SEER is classified as what kind of efficiency?
Standard
400
40 degrees F
Pi x radius squared

36. The load on the evaporater will effect which pressure?
Suction
Btu/hr (output) / wattage (input)
ACR (air-conditioning refrigeration) tubing
140 degrees F

37. How do you calculate LRA?
RLA/FLA x 5
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A diffuser
5 degrees

38. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Pi x radius squared
Below 800 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
ACR (air-conditioning refrigeration) tubing

39. What kind of metering device do high-efficiency units usually use?
TXV
40 degrees F
It will be low
5 degrees

40. What is the range for normal superheat and subcooling?
SEER includes the energy used in the start-up and shut-down cycles
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Inside diameter (ID)
8-12 degrees F

41. 9' round duct has a ballpark cfm of what?
Compressor
300
Yes
8

42. The fan switch closes at what temperature?
They are larger
Belt drive and direct drive
Before the vent
140 degrees F

43. What sort of pressure will a push-through evaporator have?
Positive
Heat loss
30-35 degrees above ambient
Duct with insulation on the inside

44. What percentage silver do you need to use for an are-410 system?
Blended refrigerants
15% silphos
It will be low
Positive

45. How many amps can 14 g wire handle?
200
Duct with insulation on the inside
Standard
15 A

46. The load on the evaporater will effect which pressure?
It also rises
With a minimum of three evenly spaced self-tapping screws
Suction
105 degrees F

47. How many amps can 14 g wire handle?
Potential relay and start capacitor
Positive
15 A
S-clips and drives (cleats)

48. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
400
30 degrees F
Common
20 degrees F

49. How will too much refrigerant effect subcooling?
It will be high
200
40 degrees F
The suction line or the low-pressure side

50. 9' round duct has a ballpark cfm of what?
Boil the liquid refrigerant out ot the oil within the crankcase
Individual return air systems and central return air systems
300
140 degrees F