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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. 10 SEER is classified as what kind of efficiency?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Standard
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Individual return air systems and central return air systems

2. Will a dirty condenser cause a rise or fall in pressure?
Rise
Slugging
40 degrees F
Fiberglass

3. Where is insulation used on copper tubing used for air-conditioning?
Pull a vacuum
True
Nominal-sized tubing
The suction line or the low-pressure side

4. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Yes
Latent and sensible
Shorted winding - open winding - and grounded winding
40 degrees F

5. What is lined duct?
Rise
Duct with insulation on the inside
Inclined manometer
True

6. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Suction
It will be high
Slugging

7. Where do you check the amps on a motor?
It also rises
20 degrees above ambient
On the common terminal
Btu/hr (output) / wattage (input)

8. If the suction pressure rises - what happens to the head pressure?
A band 4 inches or more in width
Heat load
Over 800 degrees F
It also rises

9. If pressure rises - what happens to the superheat?
Nitrogen with a small amount of refrigerant
Latent and sensible
It rises
With 4' saddles

10. If the rpm's are 750 - how many poles does the motor have?
8
It rises
Shorted winding - open winding - and grounded winding
100 psig

11. Where do you check the amps on a motor?
On the common terminal
A piston type metering device
Pi x radius squared
TXV

12. What are normal conditions - as defined by the ARI.
RLA/FLA x 5
15% silphos
40 A
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

13. 13 SEER is classified as what kind of efficiency?
Staples and tape
High
Duct - electrical - and mechanical
ACR (air-conditioning refrigeration) tubing

14. Why are some ACR tubing lines insulated?
With 4' saddles
Inclined manometer
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
False

15. How do you calculate cfm?

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16. On what terminal do you check amperage?
Common
20 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Before the vent

17. At what temperature does refrigerant condense in a standard-efficiency unit?
Duct - electrical - and mechanical
The takeoff fitting
Standard
30-35 degrees above ambient

18. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
20 degrees F
Infiltration and ventilation
100
L-type

19. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
150
When it is above a conditioned space
30 degrees F

20. Most duct insulation is made of what?
Fiberglass
Yes
It will be high
Compressor

21. What are the two basic duct connection configurations for package units supply and return air ducts?
No
40 degrees F
It also rises
Over/under and side by side

22. What is the difference between SEER and EER?
The takeoff fitting
False
SEER includes the energy used in the start-up and shut-down cycles
The takeoff fitting

23. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
Outside diameter (OD)
Belt drive and direct drive
They are physically larger

24. What are the three pressures created by moving air in ductwork?
Potential relay and start capacitor
Static pressure - velocity pressure - and total pressure
Standard
Inside diameter (ID)

25. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Potential relay and start capacitor
140 degrees F
45-55%
They are larger

26. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A piston type metering device
They are larger
100

27. The load on the evaporater will effect which pressure?
Suction
30 A
4
140 degrees F

28. The load on the evaporater will effect which pressure?
Suction
False
Nitrogen with a small amount of refrigerant
To lower the amount of pressure drop through the coil

29. What is the design boiling point for most evaporator coils in residential air conditioning?
Standard
When the system is under pressure
40 degrees F
30 A

30. What is the name of the fitting where the branch line leaves the duct?
30 A
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
The takeoff fitting

31. What component changes refrigerant from a low pressure gas to a high pressure gas?
TXV
400
Compressor
A band 4 inches or more in width

32. How do you calculate cfm?

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33. How are the condenser coils different on a high-efficiency unit?
They are larger
With 4' saddles
When it is a pull-through evaporator
Heat load

34. How do you calculate the area of a circle?
In parallel
When it is a pull-through evaporator
Pi x radius squared
Individual return air systems and central return air systems

35. How will too much refrigerant effect subcooling?
Stranded
8
It will be high
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

36. In what length rolls is soft copper tubing normally available?
Side-by-side and over-and-under
Blended refrigerants
25-ft or 50-ft
They are physically larger

37. What is it called when liquid refrigerant gets into the compressor?
Heat load
TXV
Slugging
105 degrees F

38. The evaporator is designed to remove what two types of heat?
Yes
Latent and sensible
Yes
A diffuser

39. Do you need a trap on a push-through evaporator?
2
With 4' saddles
No
Staples and tape

40. Sections of duct board can be fastened together with what?
2 minutes
Average feet per minute X area in square feet (H' x W'/144)
Staples and tape
Any amount

41. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Outside diameter (OD)
Latent and sensible
8-12 degrees F

42. Pressure in ductwork is measured In what?
Dehydrated with caps on each end
25-ft or 50-ft
Inches of water column (in. WC)
Yes

43. At what temperature will brazing melt?
Btu/hr (output) / wattage (input)
Duct with insulation on the inside
Over 800 degrees F
Subtract ambient temperature from 100

44. Most duct insulation is made of what?
Pull a vacuum
Compressor
Fiberglass
Duct - electrical - and mechanical

45. 9' round duct has a ballpark cfm of what?
Average feet per minute X area in square feet (H' x W'/144)
Below 800 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
300

46. Do you need a trap on a pull-through evaporator?
Below 800 degrees F
Yes
Below 800 degrees F
Stranded

47. What is lined duct?
Duct with insulation on the inside
A dirty evaporator
2 minutes
A bypass duct or a dump zone

48. The A/C size is calculated by what?
Heat load
TXV
It also rises
Common

49. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
Static pressure - velocity pressure - and total pressure
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
100 psig

50. What are the components of a hard-start kit?
A bypass duct or a dump zone
Heat load
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Potential relay and start capacitor