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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. What is the typical pressure differance across a TXV?
6
Over 800 degrees F
30-35 degrees above ambient
100 psig

2. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
No
L-type
Individual return air systems and central return air systems
Positive

3. What is the typical pressure differance across a TXV?
40 degrees F
In parallel
2
100 psig

4. What are the two types of return air systems in residential installations?
1/4'
6
True
Individual return air systems and central return air systems

5. What is considered normal operating conditions?
S-clips and drives (cleats)
Compressor
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pull a vacuum

6. Where do you apply flux when soldering?
Outside of the male fitting
Stranded
Duct - electrical - and mechanical
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

7. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
Before the vent
Vapor
RLA/FLA x 5

8. At what temperature will soft solder melt?
Below 800 degrees F
They are physically larger
Static pressure - velocity pressure - and total pressure
12000

9. How do you calculate cfm?

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10. 8' round duct has a ballpark cfm of what?
20 degrees above ambient
200
2
SEER includes the energy used in the start-up and shut-down cycles

11. What is it called when liquid refrigerant gets into the compressor?
A band 4 inches or more in width
Inches of water column (in. WC)
8
Slugging

12. What are the two types of package units?
No
Side-by-side and over-and-under
The suction line or the low-pressure side
With an are rating

13. If the rpm's are 1050 - how many poles does the motor have?
Compressor
Indoor fan motor - outdoor fan motor - and the compressor
Blended refrigerants
6

14. Why are some ACR tubing lines insulated?
40 A
Any amount
Over 800 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

15. How is flexible duct supported?
A bypass duct or a dump zone
Heat loss
A band 4 inches or more in width
40 degrees F

16. 10' round duct has a ballpark cfm of what?
A piston type metering device
2
400
Indoor fan motor - outdoor fan motor - and the compressor

17. What are the four materials used to make duct?
Potential relay and start capacitor
20 degrees F
A dirty evaporator
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

18. What do you do after you braze a system?
Pull a vacuum
Common
Before the vent
200

19. How do you calculate LRA?
RLA/FLA x 5
Shorted winding - open winding - and grounded winding
12000
SEER includes the energy used in the start-up and shut-down cycles

20. How long should you leave a system off once you kill power before restarting it?
Dehydrated with caps on each end
200
2 minutes
8

21. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
1/4'
High
30 degrees F
300

22. What are the three pressures created by moving air in ductwork?
Subtract ambient temperature from 100
Blended refrigerants
Yes
Static pressure - velocity pressure - and total pressure

23. When must a copper joint never be soldered or brazed?
When it is above a conditioned space
40 degrees F
100
When the system is under pressure

24. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
RLA/FLA x 5
45-55%
Any amount
15% silphos

25. Which is more efficient - a TXV or a fixed-orifice metering device?
25-ft or 50-ft
TXV
Indoor fan motor - outdoor fan motor - and the compressor
Yes

26. How many amps can 12 g wire handle?
15% silphos
20 A
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Inclined manometer

27. Does a package unit come from the factory pre-charged?
Yes
140 degrees F
8
Inches of water column (in. WC)

28. How is flexible duct supported?
No
30 degrees F
4
A band 4 inches or more in width

29. What type of air conditioning system must be charged using the superheat method?
400
Pi x radius squared
A piston type metering device
100

30. 10' round duct has a ballpark cfm of what?
400
Pi x radius squared
They are larger
Over/under and side by side

31. The compressor is cooled by liquid refrigerant. (True of False)
False
105 degrees F
ACR (air-conditioning refrigeration) tubing
Fiberglass

32. When must a copper joint never be soldered or brazed?
With a minimum of three evenly spaced self-tapping screws
On the common terminal
It will be high
When the system is under pressure

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

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34. Which type of wire can handle a higher ampacity?
Compressor
Stranded
A band 4 inches or more in width
Nominal-sized tubing

35. When do you install an auxillary drain pan?
45-55%
Rise
45 degrees F
When it is above a conditioned space

36. What are the three major power-consuming devices on an air-conditioning system?
12000
When it is a pull-through evaporator
A diffuser
Indoor fan motor - outdoor fan motor - and the compressor

37. How is ACR tubing sized?
Nominal-sized tubing
Outside diameter (OD)
It will have a decrease in superheat
Blended refrigerants

38. On what terminal do you check amperage?
2
With a minimum of three evenly spaced self-tapping screws
Inclined manometer
Common

39. How do you calculate the area of a circle?
Duct with insulation on the inside
It rises
Pi x radius squared
40 degrees F

40. What are the two basic duct connection configurations for package units supply and return air ducts?
Duct - electrical - and mechanical
Heat load
Over/under and side by side
30 A

41. 6' round duct has a ballpark cfm of what?
SEER includes the energy used in the start-up and shut-down cycles
True
100
200

42. What gauge is thermostat wire?
Inclined manometer
40 degrees F
18 gauge
40 A

43. Which type of wire can handle a higher ampacity?
20 degrees F
Belt drive and direct drive
Stranded
Over/under and side by side

44. When do you install a trap on a drain line?
When it is a pull-through evaporator
Belt drive and direct drive
Any amount
100

45. Do you need a vent on a pull-through evaporator?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
Before the vent
L-type

46. What tool is used to expand the diameter of soft copper tubing
Average feet per minute X area in square feet (H' x W'/144)
A swaging tool
12000
Outside diameter (OD)

47. The fan switch closes at what temperature?
Boil the liquid refrigerant out ot the oil within the crankcase
In series
On the common terminal
140 degrees F

48. How many amps can 10 g wire handle?
30 A
Dehydrated with caps on each end
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Vapor

49. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
It will have a decrease in superheat
A bypass duct or a dump zone
Yes
Yes

50. What are the three pressures created by moving air in ductwork?
Duct - electrical - and mechanical
400
To lower the amount of pressure drop through the coil
Static pressure - velocity pressure - and total pressure