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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. How do you calculate LRA?
ACR (air-conditioning refrigeration) tubing
It rises
RLA/FLA x 5
20 degrees F

2. The fan switch opens at what temperature?
105 degrees F
30 degrees F
With 4' saddles
L-type

3. How are round ducts supported?

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4. 13 SEER is classified as what kind of efficiency?
When it is a pull-through evaporator
400
No
High

5. What is the name of the fitting where the branch line leaves the duct?
Suction
The takeoff fitting
100 psig
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

6. What is the name of the fitting where the branch line leaves the duct?
Any amount
Yes
It rises
The takeoff fitting

7. How do you calculate the area of a circle?
Pi x radius squared
A band 4 inches or more in width
Nominal-sized tubing
30-35 degrees above ambient

8. 6' round duct has a ballpark cfm of what?
400
Heat loss
105 degrees F
100

9. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
1/4'
It also rises
40 degrees F

10. At what temperature does refrigerant condense in a high-efficiency unit?
Pull a vacuum
It rises
45 degrees F
20 degrees above ambient

11. The crankcase heater on an air-conditioning compressor is used to what?
Blended refrigerants
Subtract ambient temperature from 100
Common
Boil the liquid refrigerant out ot the oil within the crankcase

12. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
To lower the amount of pressure drop through the coil
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A swaging tool

13. How many amps can 14 g wire handle?
Shorted winding - open winding - and grounded winding
When it is a pull-through evaporator
In series
15 A

14. 10' round duct has a ballpark cfm of what?
400
Shorted winding - open winding - and grounded winding
45-55%
Compressor

15. What are the three crafts normally associated with an air-conditioned installation?
Individual return air systems and central return air systems
A diffuser
Standard
Duct - electrical - and mechanical

16. What is it called when liquid refrigerant gets into the compressor?
Slugging
Individual return air systems and central return air systems
Compressor
Negative

17. Sections of duct board can be fastened together with what?
Staples and tape
Latent and sensible
With 4' saddles
Heat loss

18. How many amps can 10 g wire handle?
Potential relay and start capacitor
Any amount
Slugging
30 A

19. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
40 degrees F
L-type
5 degrees
Yes

20. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
20 A
40 degrees F
6
Boil the liquid refrigerant out ot the oil within the crankcase

21. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Inches of water column (in. WC)
20 degrees F
Positive
Duct with insulation on the inside

22. What is used to measure static air pressure in ducts.
SEER includes the energy used in the start-up and shut-down cycles
TXV
20 degrees above ambient
Inclined manometer

23. The fan switch opens at what temperature?
400
Nitrogen with a small amount of refrigerant
Vapor
105 degrees F

24. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
105 degrees F
Inclined manometer
To remove humidity and lower dry bulb temperature

25. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
They are larger
45 degrees F
Infiltration and ventilation

26. What is considered normal operating conditions?
S-clips and drives (cleats)
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
15% silphos
Yes

27. If the suction pressure rises - what happens to the head pressure?
It also rises
To remove humidity and lower dry bulb temperature
Outside diameter (OD)
20 A

28. What are the two types of package units?
40 A
Infiltration and ventilation
25-ft or 50-ft
Side-by-side and over-and-under

29. The A/C size is calculated by what?
Inches of water column (in. WC)
30 degrees F
By increasing the surface of the condenser coil
Heat load

30. What kind of copper tubing is used for plumbing and heating applications?
45-55%
200
A swaging tool
Nominal-sized tubing

31. How are the condenser coils different on a high-efficiency unit?
8
Over/under and side by side
40 degrees F
They are larger

32. Where do you check the amps on a motor?
On the common terminal
A diffuser
18 gauge
Yes

33. What is the normal evaporator temperature?
Pi x radius squared
When it is a pull-through evaporator
Heat load
45 degrees F

34. What is a package unit?
They are physically larger
To lower the amount of pressure drop through the coil
SEER includes the energy used in the start-up and shut-down cycles
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

35. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
Static pressure - velocity pressure - and total pressure
Indoor fan motor - outdoor fan motor - and the compressor
They are physically larger

36. 10' round duct has a ballpark cfm of what?
S-clips and drives (cleats)
400
45 degrees F
Heat load

37. The A/C size is calculated by what?
Heat load
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A bypass duct or a dump zone
It also rises

38. Can refrigerant line sets be altered in length?
Yes
20 A
Duct - electrical - and mechanical
Compressor

39. Superheat should never be below how many degrees
It also rises
5 degrees
100
15% silphos

40. How many cfm per ton?
Individual return air systems and central return air systems
30 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
400

41. What are the components of a hard-start kit?
S-clips and drives (cleats)
Potential relay and start capacitor
A bypass duct or a dump zone
18 gauge

42. How long should you leave a system off once you kill power before restarting it?
2 minutes
Belt drive and direct drive
True
Yes

43. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
With 4' saddles
Shorted winding - open winding - and grounded winding
ACR (air-conditioning refrigeration) tubing

44. In what length rolls is soft copper tubing normally available?
Pull a vacuum
25-ft or 50-ft
It rises
8

45. What is lined duct?
100
Duct with insulation on the inside
Positive
Side-by-side and over-and-under

46. 7' round duct has a ballpark cfm of what?
Potential relay and start capacitor
Heat load
Slugging
150

47. How is ACR tubing sized?
Heat load
In series
Btu/hr (output) / wattage (input)
Outside diameter (OD)

48. What distributes supply air to a room in a structure?
45 degrees F
A diffuser
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
150

49. A reciprocating compressor has what sort of moving parts?
Blended refrigerants
A swaging tool
Yes
Pistons

50. How are round ducts supported?

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