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. Will a dirty condenser cause a rise or fall in pressure?
RLA/FLA x 5
200
A piston type metering device
Rise

2. How do you calculate the area of a circle?
Any amount
S-clips and drives (cleats)
Pistons
Pi x radius squared

3. The A/C size is calculated by what?
When it is a pull-through evaporator
Latent and sensible
Yes
Heat load

4. How many BTU's per ton?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
12000
Static pressure - velocity pressure - and total pressure
45 degrees F

5. How is flexible duct supported?
A band 4 inches or more in width
Btu/hr (output) / wattage (input)
Any amount
With an are rating

6. How many amps can 8 g wire handle?
False
SEER includes the energy used in the start-up and shut-down cycles
40 A
8-12 degrees F

7. How many BTU's per ton?
TXV
Yes
12000
The takeoff fitting

8. What do you use to connect square and rectangular ductboard together?
It also rises
S-clips and drives (cleats)
Indoor fan motor - outdoor fan motor - and the compressor
Pull a vacuum

9. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
A swaging tool
Compressor
Static pressure - velocity pressure - and total pressure

10. 10' round duct has a ballpark cfm of what?
Positive
400
8-12 degrees F
Staples and tape

11. When must a copper joint never be soldered or brazed?
When the system is under pressure
S-clips and drives (cleats)
With a minimum of three evenly spaced self-tapping screws
140 degrees F

12. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
105 degrees F
45-55%
Side-by-side and over-and-under

13. What kind of metering device do high-efficiency units usually use?
Belt drive and direct drive
TXV
Common
To remove humidity and lower dry bulb temperature

14. If the rpm's are 1050 - how many poles does the motor have?
6
It will have a decrease in superheat
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
30-35 degrees above ambient

15. Does a package unit come from the factory pre-charged?
No
True
Yes
1/4'

16. When must a copper joint never be soldered or brazed?
300
Potential relay and start capacitor
Individual return air systems and central return air systems
When the system is under pressure

17. The crankcase heater on an air-conditioning compressor is used to what?
Over 800 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
30-35 degrees above ambient
It rises

18. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
Suction
Duct with insulation on the inside
Pull a vacuum

19. In what state is the refrigerant in the compressor?
When it is a pull-through evaporator
Vapor
Slugging
45 degrees F

20. How is the high pressure switch wired with the low pressure switch?
A piston type metering device
In parallel
Pi x radius squared
105 degrees F

21. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Over 800 degrees F
400
A diffuser

22. 13 SEER is classified as what kind of efficiency?
Vapor
High
40 degrees F
40 A

23. In what state is the refrigerant in the compressor?
Vapor
Indoor fan motor - outdoor fan motor - and the compressor
Heat loss
Common

24. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
30 A
Outside diameter (OD)
True
2

25. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
A dirty evaporator
2 minutes
6
In series

26. How many amps can 10 g wire handle?
Nitrogen with a small amount of refrigerant
Pistons
20 A
30 A

27. How much does a drain line need to drop per foot of length?

28. What are the components of a hard-start kit?
Potential relay and start capacitor
Vapor
Inches of water column (in. WC)
8

29. At what temperature will brazing melt?
40 degrees F
By increasing the surface of the condenser coil
6
Over 800 degrees F

30. What is considered normal operating conditions?
No
In parallel
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Outside of the male fitting

31. If the rpm's are 750 - how many poles does the motor have?
Nominal-sized tubing
30 degrees F
Blended refrigerants
8

32. What gauge is thermostat wire?
100 psig
18 gauge
Latent and sensible
When it is a pull-through evaporator

33. When do you install an auxillary drain pan?
When it is above a conditioned space
They are physically larger
45 degrees F
Stranded

34. How many amps can 14 g wire handle?
Below 800 degrees F
Nitrogen with a small amount of refrigerant
Below 800 degrees F
15 A

35. A reciprocating compressor has what sort of moving parts?
No
On the common terminal
Stranded
Pistons

36. Why are some ACR tubing lines insulated?
To remove humidity and lower dry bulb temperature
Over 800 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
45-55%

37. What is a package unit?
140 degrees F
20 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
30-35 degrees above ambient

38. Does a package unit come from the factory pre-charged?
Before the vent
Pi x radius squared
It also rises
Yes

39. Sections of duct board can be fastened together with what?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Staples and tape
Btu/hr (output) / wattage (input)
Heat loss

40. At what temperature does refrigerant condense in a standard-efficiency unit?
Suction
30-35 degrees above ambient
25-ft or 50-ft
Positive

41. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
ACR (air-conditioning refrigeration) tubing
Nitrogen with a small amount of refrigerant
20 A

42. 10 SEER is classified as what kind of efficiency?
Standard
Yes
Inclined manometer
Potential relay and start capacitor

43. What are the four materials used to make duct?
Slugging
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
1/4'

44. How does ACR copper pipe come?
Dehydrated with caps on each end
Outside diameter (OD)
Indoor fan motor - outdoor fan motor - and the compressor
20 A

45. What are the three crafts normally associated with an air-conditioned installation?
Average feet per minute X area in square feet (H' x W'/144)
To remove humidity and lower dry bulb temperature
Duct - electrical - and mechanical
Standard

46. If the rpm's are 3450 - how many poles does the motor have?
2
Individual return air systems and central return air systems
20 A
TXV

47. Where do you install a trap on a drain line?
20 degrees above ambient
Static pressure - velocity pressure - and total pressure
They are larger
Before the vent

48. How do you calculate EER?
Btu/hr (output) / wattage (input)
With 4' saddles
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
S-clips and drives (cleats)

49. What sort of pressure will a pull-through evaporator have?
Inclined manometer
Negative
They are larger
They are physically larger

50. On what terminal do you check amperage?
Blended refrigerants
SEER includes the energy used in the start-up and shut-down cycles
RLA/FLA x 5
Common