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 two types of blower drives?
Yes
Outside of the male fitting
Belt drive and direct drive
1/4'

2. If pressure rises - what happens to the superheat?
It rises
100
Yes
4

3. How will too much refrigerant effect superheat?
It will be low
With an are rating
105 degrees F
A diffuser

4. What are the two basic duct connection configurations for package units supply and return air ducts?
Staples and tape
It rises
ACR (air-conditioning refrigeration) tubing
Over/under and side by side

5. What do you do after you braze a system?
40 A
Duct - electrical - and mechanical
Pull a vacuum
Stranded

6. When must a copper joint never be soldered or brazed?
When the system is under pressure
Inches of water column (in. WC)
20 degrees above ambient
400

7. Where is insulation used on copper tubing used for air-conditioning?
20 degrees F
Suction
2 minutes
The suction line or the low-pressure side

8. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Dehydrated with caps on each end
Over 800 degrees F
Rise

9. The fan switch closes at what temperature?
140 degrees F
40 degrees F
Positive
15% silphos

10. What is the range for normal superheat and subcooling?
By increasing the surface of the condenser coil
8-12 degrees F
140 degrees F
6

11. What do you use to check for leaks?
300
Inches of water column (in. WC)
Nitrogen with a small amount of refrigerant
Compressor

12. At what temperature will brazing melt?
12000
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Over 800 degrees F
The suction line or the low-pressure side

13. What is lined duct?
45-55%
Duct with insulation on the inside
2 minutes
It rises

14. What kind of copper tubing is used for plumbing and heating applications?
False
25-ft or 50-ft
15% silphos
Nominal-sized tubing

15. What are the two types of package units?
Btu/hr (output) / wattage (input)
With a minimum of three evenly spaced self-tapping screws
45 degrees F
Side-by-side and over-and-under

16. How long should you leave a system off once you kill power before restarting it?
To remove humidity and lower dry bulb temperature
Compressor
2 minutes
It will be high

17. What sort of pressure will a pull-through evaporator have?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Inside diameter (ID)
Side-by-side and over-and-under
Negative

18. How many amps can 10 g wire handle?
Yes
140 degrees F
15% silphos
30 A

19. 9' round duct has a ballpark cfm of what?
Rise
300
L-type
Average feet per minute X area in square feet (H' x W'/144)

20. If the rpm's are 1750 - how many poles does the motor have?
4
30 A
140 degrees F
It also rises

21. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Staples and tape
Over/under and side by side
Pull a vacuum
45-55%

22. The load on the evaporater will effect which pressure?
Suction
A piston type metering device
20 A
A swaging tool

23. At what temperature will brazing melt?
ACR (air-conditioning refrigeration) tubing
Over 800 degrees F
Yes
300

24. What are the two functions of the air-conditioning system?
Dehydrated with caps on each end
Pistons
To remove humidity and lower dry bulb temperature
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

25. Do you need a trap on a pull-through evaporator?
It rises
Yes
To lower the amount of pressure drop through the coil
2 minutes

26. What are the three crafts normally associated with an air-conditioned installation?
30 degrees F
In parallel
Duct - electrical - and mechanical
When it is a pull-through evaporator

27. How is flexible duct supported?
The suction line or the low-pressure side
Subtract ambient temperature from 100
A band 4 inches or more in width
25-ft or 50-ft

28. How is ACR tubing sized?
40 degrees F
Compressor
Outside diameter (OD)
Suction

29. When do you install an auxillary drain pan?
When it is above a conditioned space
20 A
Btu/hr (output) / wattage (input)
With a minimum of three evenly spaced self-tapping screws

30. What are the two types of return air systems in residential installations?
Stranded
Individual return air systems and central return air systems
Fiberglass
They are larger

31. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
300
Before the vent
To lower the amount of pressure drop through the coil
Duct - electrical - and mechanical

32. What is lined duct?
RLA/FLA x 5
Vapor
Side-by-side and over-and-under
Duct with insulation on the inside

33. At what temperature does refrigerant condense in a standard-efficiency unit?
5 degrees
4
Slugging
30-35 degrees above ambient

34. Do you need a vent on a pull-through evaporator?
They are physically larger
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Yes
Inches of water column (in. WC)

35. If the rpm's are 3450 - how many poles does the motor have?
Outside diameter (OD)
Nitrogen with a small amount of refrigerant
2
Yes

36. 10' round duct has a ballpark cfm of what?
Boil the liquid refrigerant out ot the oil within the crankcase
Positive
40 degrees F
400

37. 10 SEER is classified as what kind of efficiency?
18 gauge
Standard
45 degrees F
Heat load

38. What kind of copper tubing is used for refrigeration or air-conditioning applications?
A swaging tool
15% silphos
In series
ACR (air-conditioning refrigeration) tubing

39. What are the two basic duct connection configurations for package units supply and return air ducts?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Suction
Yes
Over/under and side by side

40. Do you need a vent on a pull-through evaporator?
Individual return air systems and central return air systems
Yes
Boil the liquid refrigerant out ot the oil within the crankcase
Standard

41. Which type of wire can handle a higher ampacity?
Before the vent
True
20 degrees F
Stranded

42. 10' round duct has a ballpark cfm of what?
400
The takeoff fitting
40 degrees F
RLA/FLA x 5

43. What are the three crafts normally associated with an air-conditioned installation?
A bypass duct or a dump zone
Duct - electrical - and mechanical
Average feet per minute X area in square feet (H' x W'/144)
Yes

44. How many amps can 14 g wire handle?
On the common terminal
15 A
To remove humidity and lower dry bulb temperature
100

45. How do you calculate the area of a circle?
Staples and tape
Pi x radius squared
200
Yes

46. Pressure in ductwork is measured In what?
150
Inches of water column (in. WC)
They are physically larger
L-type

47. What are the two types of package units?
Before the vent
Side-by-side and over-and-under
15 A
Pistons

48. Can refrigerant line sets be altered in length?
Yes
False
To remove humidity and lower dry bulb temperature
ACR (air-conditioning refrigeration) tubing

49. What are the three ways a motor can fail electrically?
ACR (air-conditioning refrigeration) tubing
Shorted winding - open winding - and grounded winding
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
They are physically larger

50. What are the two types of blower drives?
Belt drive and direct drive
Subtract ambient temperature from 100
Subtract ambient temperature from 100
Duct - electrical - and mechanical