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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. When must a copper joint never be soldered or brazed?
When the system is under pressure
To remove humidity and lower dry bulb temperature
Stranded
2 minutes

2. What do you use to connect square and rectangular ductboard together?
Fiberglass
S-clips and drives (cleats)
Potential relay and start capacitor
A dirty evaporator

3. What is the normal evaporator temperature?
40 degrees F
45 degrees F
400
ACR (air-conditioning refrigeration) tubing

4. Where do you apply flux when soldering?
By increasing the surface of the condenser coil
20 degrees F
Outside of the male fitting
Yes

5. If the suction pressure rises - what happens to the head pressure?
It also rises
Nitrogen with a small amount of refrigerant
A band 4 inches or more in width
30-35 degrees above ambient

6. Where do you install a trap on a drain line?
A bypass duct or a dump zone
30 degrees F
When the system is under pressure
Before the vent

7. What kind of copper tubing is used for plumbing and heating applications?
They are larger
Nominal-sized tubing
Indoor fan motor - outdoor fan motor - and the compressor
45 degrees F

8. Pressure in ductwork is measured In what?
Yes
Inches of water column (in. WC)
Negative
S-clips and drives (cleats)

9. What is the typical pressure differance across a TXV?
Any amount
Before the vent
100 psig
8

10. When do you install a trap on a drain line?
400
When it is a pull-through evaporator
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Fiberglass

11. Does a package unit come from the factory pre-charged?
Yes
ACR (air-conditioning refrigeration) tubing
400
5 degrees

12. What percentage silver do you need to use for an are-410 system?
100 psig
200
15% silphos
400

13. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
Subtract ambient temperature from 100
Any amount

14. What type of air conditioning system must be charged using the superheat method?
Yes
A piston type metering device
Standard
30-35 degrees above ambient

15. What kind of metering device do high-efficiency units usually use?
TXV
Duct - electrical - and mechanical
100 psig
When it is a pull-through evaporator

16. In what state is the refrigerant in the compressor?
Vapor
Heat loss
Boil the liquid refrigerant out ot the oil within the crankcase
Shorted winding - open winding - and grounded winding

17. What can cause a decrease in suction pressure on an air-conditioning system?
200
When it is a pull-through evaporator
A dirty evaporator
To remove humidity and lower dry bulb temperature

18. What sort of pressure will a pull-through evaporator have?
Static pressure - velocity pressure - and total pressure
20 A
Yes
Negative

19. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
A swaging tool
40 degrees F
When it is a pull-through evaporator

20. When do you install an auxillary drain pan?
When it is above a conditioned space
A diffuser
Btu/hr (output) / wattage (input)
In parallel

21. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
To remove humidity and lower dry bulb temperature
A swaging tool
18 gauge

22. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
When the system is under pressure
True
2 minutes
A bypass duct or a dump zone

23. How does ACR copper pipe come?
When it is a pull-through evaporator
100
Dehydrated with caps on each end
Infiltration and ventilation

24. What sort of pressure will a push-through evaporator have?
S-clips and drives (cleats)
A band 4 inches or more in width
Positive
Blended refrigerants

25. How many amps can 10 g wire handle?
Indoor fan motor - outdoor fan motor - and the compressor
1/4'
30 A
12000

26. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
ACR (air-conditioning refrigeration) tubing
Vapor
30 degrees F

27. What sort of pressure will a push-through evaporator have?
30-35 degrees above ambient
Potential relay and start capacitor
Positive
12000

28. What component changes refrigerant from a low pressure gas to a high pressure gas?
30 degrees F
Compressor
Boil the liquid refrigerant out ot the oil within the crankcase
Indoor fan motor - outdoor fan motor - and the compressor

29. What component changes refrigerant from a low pressure gas to a high pressure gas?
Pi x radius squared
A piston type metering device
Static pressure - velocity pressure - and total pressure
Compressor

30. How many amps can 12 g wire handle?
Before the vent
6
20 A
Outside of the male fitting

31. What kind of refrigeratnts must be added in liquid form?
S-clips and drives (cleats)
Blended refrigerants
The suction line or the low-pressure side
With 4' saddles

32. What do you use to check for leaks?
1/4'
40 degrees F
L-type
Nitrogen with a small amount of refrigerant

33. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Heat loss
Potential relay and start capacitor
The suction line or the low-pressure side

34. How will too much refrigerant effect superheat?
Stranded
Yes
It will be low
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

35. How many amps can 12 g wire handle?
Potential relay and start capacitor
140 degrees F
20 A
4

36. What can cause a decrease in suction pressure on an air-conditioning system?
Subtract ambient temperature from 100
When the system is under pressure
Positive
A dirty evaporator

37. Do you need a trap on a push-through evaporator?
With a minimum of three evenly spaced self-tapping screws
6
No
It also rises

38. The fan switch opens at what temperature?
Nominal-sized tubing
Indoor fan motor - outdoor fan motor - and the compressor
105 degrees F
6

39. How many amps can 10 g wire handle?
It rises
Standard
30 A
Pistons

40. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
Inclined manometer
Before the vent
15 A

41. How is flexible duct supported?
A band 4 inches or more in width
Latent and sensible
Compressor
A diffuser

42. Do you need a vent on a pull-through evaporator?
Yes
Dehydrated with caps on each end
Shorted winding - open winding - and grounded winding
Rise

43. How is the high pressure switch wired with the low pressure switch?
With an are rating
2
105 degrees F
In parallel

44. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
15 A
Yes
45-55%
Heat load

45. At what temperature will brazing melt?
Negative
Over 800 degrees F
In series
Outside diameter (OD)

46. Do you need a trap on a push-through evaporator?
With an are rating
No
Below 800 degrees F
15 A

47. What are the three crafts normally associated with an air-conditioned installation?
150
Duct - electrical - and mechanical
With a minimum of three evenly spaced self-tapping screws
20 degrees above ambient

48. What percentage silver do you need to use for an are-410 system?
140 degrees F
45 degrees F
15% silphos
Static pressure - velocity pressure - and total pressure

49. What are the two types of package units?
Side-by-side and over-and-under
It will have a decrease in superheat
40 A
It will be low

50. How are round ducts supported?

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