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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 temperature difference between a high-efficiency condenser and the ambient temperature?
Boil the liquid refrigerant out ot the oil within the crankcase
Nitrogen with a small amount of refrigerant
20 degrees F
Nominal-sized tubing

2. Sections of duct board can be fastened together with what?
In parallel
Staples and tape
400
To lower the amount of pressure drop through the coil

3. Pressure in ductwork is measured In what?
Slugging
Inches of water column (in. WC)
In series
200

4. How many cfm per ton?
It also rises
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
400
Inches of water column (in. WC)

5. How are the condenser coils different on a high-efficiency unit?
They are larger
SEER includes the energy used in the start-up and shut-down cycles
Btu/hr (output) / wattage (input)
It will be low

6. What are the four materials used to make duct?
ACR (air-conditioning refrigeration) tubing
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
To lower the amount of pressure drop through the coil
15% silphos

7. When do you install a trap on a drain line?
Average feet per minute X area in square feet (H' x W'/144)
In parallel
Over/under and side by side
When it is a pull-through evaporator

8. Which type of wire can handle a higher ampacity?
TXV
5 degrees
Stranded
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

9. The furnace size is calculated by what?
TXV
30 degrees F
Heat loss
They are physically larger

10. Where do you apply flux when soldering?
Rise
Duct with insulation on the inside
L-type
Outside of the male fitting

11. At what temperature will soft solder melt?
8
Pi x radius squared
When it is above a conditioned space
Below 800 degrees F

12. How do you calculate the area of a circle?
2
Pi x radius squared
Subtract ambient temperature from 100
45 degrees F

13. At what temperature will brazing melt?
40 degrees F
The suction line or the low-pressure side
Over 800 degrees F
When it is above a conditioned space

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

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15. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
With an are rating
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
30 degrees F
1/4'

16. The compressor is cooled by liquid refrigerant. (True of False)
When it is a pull-through evaporator
30 degrees F
False
Potential relay and start capacitor

17. How do you calculate EER?
Btu/hr (output) / wattage (input)
45 degrees F
RLA/FLA x 5
High

18. What are the two basic duct connection configurations for package units supply and return air ducts?
L-type
SEER includes the energy used in the start-up and shut-down cycles
The suction line or the low-pressure side
Over/under and side by side

19. What are the three crafts normally associated with an air-conditioned installation?
Btu/hr (output) / wattage (input)
Duct - electrical - and mechanical
Yes
Over/under and side by side

20. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Yes
A bypass duct or a dump zone
Over/under and side by side
They are physically larger

21. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
TXV
It will be low
4

22. What are the two types of blower drives?
Outside diameter (OD)
Belt drive and direct drive
The takeoff fitting
The suction line or the low-pressure side

23. On what terminal do you check amperage?
Potential relay and start capacitor
Common
100
Negative

24. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
400
Negative
Any amount

25. Do you need a vent on a push-through evaporator?
To lower the amount of pressure drop through the coil
Outside of the male fitting
1/4'
Yes

26. Where is insulation used on copper tubing used for air-conditioning?
Potential relay and start capacitor
Outside of the male fitting
The suction line or the low-pressure side
Pi x radius squared

27. If the rpm's are 750 - how many poles does the motor have?
8
S-clips and drives (cleats)
Yes
Suction

28. If the rpm's are 1050 - how many poles does the motor have?
400
The takeoff fitting
6
300

29. What are the three major power-consuming devices on an air-conditioning system?
When it is a pull-through evaporator
1/4'
Indoor fan motor - outdoor fan motor - and the compressor
Staples and tape

30. 10' round duct has a ballpark cfm of what?
Boil the liquid refrigerant out ot the oil within the crankcase
400
Static pressure - velocity pressure - and total pressure
A diffuser

31. If the rpm's are 750 - how many poles does the motor have?
When it is above a conditioned space
By increasing the surface of the condenser coil
100
8

32. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
The takeoff fitting
The takeoff fitting
45 degrees F

33. What gauge is thermostat wire?
Inches of water column (in. WC)
8
Heat load
18 gauge

34. At what temperature will brazing melt?
Over 800 degrees F
The takeoff fitting
Heat load
False

35. In what length rolls is soft copper tubing normally available?
A diffuser
25-ft or 50-ft
Yes
To remove humidity and lower dry bulb temperature

36. What is the difference between SEER and EER?
L-type
It also rises
140 degrees F
SEER includes the energy used in the start-up and shut-down cycles

37. What are the three crafts normally associated with an air-conditioned installation?
When it is a pull-through evaporator
Subtract ambient temperature from 100
A bypass duct or a dump zone
Duct - electrical - and mechanical

38. How many amps can 12 g wire handle?
20 A
Boil the liquid refrigerant out ot the oil within the crankcase
When the system is under pressure
40 A

39. Do you need a trap on a pull-through evaporator?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
12000
When it is above a conditioned space
Yes

40. What component changes refrigerant from a low pressure gas to a high pressure gas?
Standard
A bypass duct or a dump zone
Compressor
300

41. How is the high pressure switch wired with the low pressure switch?
140 degrees F
In parallel
They are larger
Blended refrigerants

42. How many amps can 10 g wire handle?
30 A
Stranded
Side-by-side and over-and-under
No

43. The A/C size is calculated by what?
Static pressure - velocity pressure - and total pressure
Heat load
When it is a pull-through evaporator
RLA/FLA x 5

44. How are round ducts supported?

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45. What is the name of the fitting where the branch line leaves the duct?
Inclined manometer
They are larger
45-55%
The takeoff fitting

46. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
TXV
It will have a decrease in superheat
High
It will be low

47. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
S-clips and drives (cleats)
S-clips and drives (cleats)
Fiberglass
45-55%

48. Do you need a vent on a pull-through evaporator?
100
40 A
Over 800 degrees F
Yes

49. How do you calculate cfm?

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50. How many amps can 10 g wire handle?
S-clips and drives (cleats)
Below 800 degrees F
30 A
30 degrees F