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 fan switch opens at what temperature?
150
20 A
4
105 degrees F

2. What kind of refrigeratnts must be added in liquid form?
Standard
A piston type metering device
Stranded
Blended refrigerants

3. When do you install an auxillary drain pan?
30-35 degrees above ambient
Any amount
When it is above a conditioned space
Duct - electrical - and mechanical

4. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Nitrogen with a small amount of refrigerant
Any amount
RLA/FLA x 5
400

5. 7' round duct has a ballpark cfm of what?
150
With a minimum of three evenly spaced self-tapping screws
To remove humidity and lower dry bulb temperature
40 degrees F

6. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Pull a vacuum
Over/under and side by side
L-type
100

7. How is flexible duct supported?
40 degrees F
Standard
False
A band 4 inches or more in width

8. In what length rolls is soft copper tubing normally available?
15% silphos
With a minimum of three evenly spaced self-tapping screws
25-ft or 50-ft
A band 4 inches or more in width

9. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Positive
45-55%
Duct with insulation on the inside
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

10. What is the typical pressure differance across a TXV?
Dehydrated with caps on each end
100 psig
150
Individual return air systems and central return air systems

11. How many amps can 10 g wire handle?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Over 800 degrees F
18 gauge
30 A

12. What are the two ways that fresh air enters a structure?
Dehydrated with caps on each end
Infiltration and ventilation
With 4' saddles
Heat load

13. 10' round duct has a ballpark cfm of what?
They are larger
400
105 degrees F
In parallel

14. How does ACR copper pipe come?
Infiltration and ventilation
Blended refrigerants
Dehydrated with caps on each end
No

15. At what temperature does refrigerant condense in a high-efficiency unit?
Indoor fan motor - outdoor fan motor - and the compressor
20 degrees above ambient
Pi x radius squared
A piston type metering device

16. How many cfm per ton?
2 minutes
A dirty evaporator
Any amount
400

17. What do you use to connect square and rectangular ductboard together?
Heat loss
Staples and tape
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
S-clips and drives (cleats)

18. How do you calculate the area of a circle?
Infiltration and ventilation
Pi x radius squared
150
SEER includes the energy used in the start-up and shut-down cycles

19. The compressor is cooled by liquid refrigerant. (True of False)
False
A bypass duct or a dump zone
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
25-ft or 50-ft

20. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Heat load
400
It will have a decrease in superheat
Blended refrigerants

21. At what temperature will brazing melt?
Over 800 degrees F
Fiberglass
15 A
4

22. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
4
Infiltration and ventilation
30 degrees F
Before the vent

23. What are normal conditions - as defined by the ARI.
Yes
Potential relay and start capacitor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
High

24. 6' round duct has a ballpark cfm of what?
100
Before the vent
400
Compressor

25. The furnace size is calculated by what?
Heat loss
Before the vent
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Outside diameter (OD)

26. On what terminal do you check amperage?
Below 800 degrees F
Common
TXV
No

27. 8' round duct has a ballpark cfm of what?
4
Static pressure - velocity pressure - and total pressure
200
Over/under and side by side

28. Will a dirty condenser cause a rise or fall in pressure?
Btu/hr (output) / wattage (input)
Common
Rise
With a minimum of three evenly spaced self-tapping screws

29. At what temperature will soft solder melt?
Below 800 degrees F
High
20 A
Outside of the male fitting

30. How many amps can 8 g wire handle?
Positive
40 A
30-35 degrees above ambient
Pull a vacuum

31. How many amps can 10 g wire handle?
Standard
200
30 A
L-type

32. What tool is used to expand the diameter of soft copper tubing
SEER includes the energy used in the start-up and shut-down cycles
In series
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
A swaging tool

33. Will a dirty condenser cause a rise or fall in pressure?
45 degrees F
The takeoff fitting
Nominal-sized tubing
Rise

34. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
140 degrees F
Static pressure - velocity pressure - and total pressure
A bypass duct or a dump zone
Rise

35. What are normal conditions - as defined by the ARI.
It will be low
25-ft or 50-ft
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
45-55%

36. How are round ducts supported?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

37. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
L-type
Rise
TXV
40 degrees F

38. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
A piston type metering device
Yes
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

39. If the rpm's are 750 - how many poles does the motor have?
8
Blended refrigerants
The suction line or the low-pressure side
S-clips and drives (cleats)

40. Do you need a trap on a pull-through evaporator?
105 degrees F
Heat load
Yes
Outside diameter (OD)

41. The A/C size is calculated by what?
The takeoff fitting
Heat load
A dirty evaporator
12000

42. How is ACR tubing sized?
Outside diameter (OD)
Inclined manometer
20 degrees above ambient
S-clips and drives (cleats)

43. Where do you install a trap on a drain line?
18 gauge
When it is above a conditioned space
Before the vent
By increasing the surface of the condenser coil

44. What are the three ways a motor can fail electrically?
25-ft or 50-ft
Over 800 degrees F
20 degrees above ambient
Shorted winding - open winding - and grounded winding

45. 8' round duct has a ballpark cfm of what?
200
It rises
When it is a pull-through evaporator
Positive

46. What is the typical pressure differance across a TXV?
100 psig
Compressor
Dehydrated with caps on each end
Staples and tape

47. What is the normal evaporator temperature?
18 gauge
40 degrees F
40 degrees F
45 degrees F

48. At what temperature will soft solder melt?
15 A
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
They are physically larger
Below 800 degrees F

49. What are the two basic duct connection configurations for package units supply and return air ducts?
Yes
Common
A band 4 inches or more in width
Over/under and side by side

50. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Nominal-sized tubing
Below 800 degrees F
To remove humidity and lower dry bulb temperature
They are physically larger