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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 many amps can 14 g wire handle?
15 A
High
S-clips and drives (cleats)
1/4'

2. What do you do after you braze a system?
Pull a vacuum
It also rises
Stranded
45-55%

3. What are the two types of package units?
Shorted winding - open winding - and grounded winding
Side-by-side and over-and-under
Before the vent
Any amount

4. What is lined duct?
The takeoff fitting
A swaging tool
Duct with insulation on the inside
Boil the liquid refrigerant out ot the oil within the crankcase

5. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
False
L-type

6. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Positive
No
By increasing the surface of the condenser coil

7. The compressor is cooled by liquid refrigerant. (True of False)
15 A
45-55%
False
Standard

8. Do you need a vent on a pull-through evaporator?
Dehydrated with caps on each end
Yes
Heat load
6

9. How do you calculate LRA?
30 degrees F
TXV
100 psig
RLA/FLA x 5

10. What is the range for normal superheat and subcooling?
8-12 degrees F
Latent and sensible
It will be high
Inches of water column (in. WC)

11. Do you need a vent on a push-through evaporator?
100 psig
With a minimum of three evenly spaced self-tapping screws
5 degrees
Yes

12. Where do you install a trap on a drain line?
A piston type metering device
20 degrees F
Before the vent
1/4'

13. Do you need a trap on a pull-through evaporator?
Yes
A bypass duct or a dump zone
To lower the amount of pressure drop through the coil
Common

14. In what length rolls is soft copper tubing normally available?
1/4'
Inclined manometer
It will have a decrease in superheat
25-ft or 50-ft

15. 8' round duct has a ballpark cfm of what?
Subtract ambient temperature from 100
200
100 psig
Yes

16. What kind of copper tubing is used for plumbing and heating applications?
45 degrees F
TXV
Inside diameter (ID)
Nominal-sized tubing

17. Where is insulation used on copper tubing used for air-conditioning?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
30-35 degrees above ambient
The suction line or the low-pressure side
Staples and tape

18. What percentage silver do you need to use for an are-410 system?
40 degrees F
Positive
15% silphos
Potential relay and start capacitor

19. How do you calculate ballpark superheat?
On the common terminal
Subtract ambient temperature from 100
Outside diameter (OD)
Average feet per minute X area in square feet (H' x W'/144)

20. The fan switch closes at what temperature?
To remove humidity and lower dry bulb temperature
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
SEER includes the energy used in the start-up and shut-down cycles
140 degrees F

21. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
30-35 degrees above ambient
Any amount
Inches of water column (in. WC)
With a minimum of three evenly spaced self-tapping screws

22. What are the three crafts normally associated with an air-conditioned installation?
They are larger
Pi x radius squared
2 minutes
Duct - electrical - and mechanical

23. How does ACR copper pipe come?
Dehydrated with caps on each end
Shorted winding - open winding - and grounded winding
The suction line or the low-pressure side
It will be low

24. What is used to measure static air pressure in ducts.
200
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Inclined manometer
Negative

25. Do you need a trap on a push-through evaporator?
TXV
Before the vent
RLA/FLA x 5
No

26. What kind of metering device do high-efficiency units usually use?
TXV
20 degrees F
12000
Infiltration and ventilation

27. What are the three major power-consuming devices on an air-conditioning system?
6
It rises
Indoor fan motor - outdoor fan motor - and the compressor
30 degrees F

28. Where do you apply flux when soldering?
With a minimum of three evenly spaced self-tapping screws
False
Outside of the male fitting
TXV

29. What is a package unit?
150
400
The suction line or the low-pressure side
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

30. How are round ducts supported?

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31. The fan switch opens at what temperature?
The suction line or the low-pressure side
105 degrees F
Nominal-sized tubing
Rise

32. What is the normal evaporator temperature?
To remove humidity and lower dry bulb temperature
In parallel
SEER includes the energy used in the start-up and shut-down cycles
45 degrees F

33. What is used to measure static air pressure in ducts.
Inclined manometer
20 degrees above ambient
With a minimum of three evenly spaced self-tapping screws
100

34. What is it called when liquid refrigerant gets into the compressor?
30-35 degrees above ambient
It will be high
Slugging
A swaging tool

35. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Infiltration and ventilation
30 degrees F
Nitrogen with a small amount of refrigerant

36. What are the two types of package units?
Side-by-side and over-and-under
Shorted winding - open winding - and grounded winding
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

37. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Shorted winding - open winding - and grounded winding
Negative
TXV
20 degrees F

38. What can cause a decrease in suction pressure on an air-conditioning system?
Btu/hr (output) / wattage (input)
A dirty evaporator
In series
With 4' saddles

39. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Outside of the male fitting
45-55%
400
L-type

40. How many amps can 8 g wire handle?
When it is a pull-through evaporator
The takeoff fitting
40 A
Infiltration and ventilation

41. If the rpm's are 750 - how many poles does the motor have?
18 gauge
8
Yes
2

42. What sort of pressure will a pull-through evaporator have?
Negative
A band 4 inches or more in width
In parallel
With 4' saddles

43. If the rpm's are 1050 - how many poles does the motor have?
20 A
6
Heat load
200

44. What do you use to check for leaks?
200
Nitrogen with a small amount of refrigerant
Any amount
45 degrees F

45. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
A piston type metering device
Positive
Staples and tape
30 degrees F

46. The load on the evaporater will effect which pressure?
8-12 degrees F
It will be high
300
Suction

47. At what temperature does refrigerant condense in a high-efficiency unit?
300
20 degrees above ambient
15% silphos
When it is a pull-through evaporator

48. The evaporator is designed to remove what two types of heat?
Below 800 degrees F
20 degrees above ambient
Latent and sensible
Yes

49. How are the condenser coils different on a high-efficiency unit?
TXV
They are larger
100 psig
L-type

50. At what temperature will soft solder melt?
40 degrees F
Shorted winding - open winding - and grounded winding
Below 800 degrees F
High