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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. Where do you apply flux when soldering?
In series
Outside of the male fitting
Static pressure - velocity pressure - and total pressure
12000

2. What kind of copper tubing is used for plumbing and heating applications?
Slugging
40 A
The suction line or the low-pressure side
Nominal-sized tubing

3. Where do you check the amps on a motor?
5 degrees
On the common terminal
Any amount
TXV

4. When do you install a trap on a drain line?
Over 800 degrees F
When it is a pull-through evaporator
Duct with insulation on the inside
A piston type metering device

5. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
140 degrees F
True
Vapor
The takeoff fitting

6. The compressor is cooled by liquid refrigerant. (True of False)
False
20 degrees F
Before the vent
2

7. The evaporator is designed to remove what two types of heat?
Outside of the male fitting
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Boil the liquid refrigerant out ot the oil within the crankcase
Latent and sensible

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

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9. What are the two types of blower drives?
It will have a decrease in superheat
TXV
Potential relay and start capacitor
Belt drive and direct drive

10. How many amps can 14 g wire handle?
15 A
Average feet per minute X area in square feet (H' x W'/144)
Static pressure - velocity pressure - and total pressure
Slugging

11. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Suction
Inside diameter (ID)
In series
To lower the amount of pressure drop through the coil

12. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
They are larger
When it is a pull-through evaporator
Rise

13. The crankcase heater on an air-conditioning compressor is used to what?
25-ft or 50-ft
12000
Pi x radius squared
Boil the liquid refrigerant out ot the oil within the crankcase

14. What is used to measure static air pressure in ducts.
Inclined manometer
Side-by-side and over-and-under
100 psig
Pull a vacuum

15. In what state is the refrigerant in the compressor?
Vapor
Pi x radius squared
Individual return air systems and central return air systems
When it is above a conditioned space

16. Do you need a vent on a pull-through evaporator?
Individual return air systems and central return air systems
Over/under and side by side
Yes
Yes

17. What are normal conditions - as defined by the ARI.
30-35 degrees above ambient
200
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Average feet per minute X area in square feet (H' x W'/144)

18. What kind of refrigeratnts must be added in liquid form?
A piston type metering device
Blended refrigerants
30 A
Compressor

19. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
A band 4 inches or more in width
Stranded
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

20. What are the two types of return air systems in residential installations?
A piston type metering device
40 degrees F
Individual return air systems and central return air systems
100 psig

21. If the rpm's are 750 - how many poles does the motor have?
Potential relay and start capacitor
8
Inclined manometer
2 minutes

22. How is nominal-sized tubing sized?
Inside diameter (ID)
150
With an are rating
Potential relay and start capacitor

23. How is ACR tubing sized?
Yes
Outside diameter (OD)
15% silphos
Heat load

24. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
200
30-35 degrees above ambient
Outside diameter (OD)

25. What are the two functions of the air-conditioning system?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
8
A bypass duct or a dump zone
To remove humidity and lower dry bulb temperature

26. When do you install an auxillary drain pan?
When it is above a conditioned space
When the system is under pressure
40 degrees F
They are physically larger

27. How many cfm per ton?
Below 800 degrees F
18 gauge
400
It will be low

28. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
100
15% silphos
In parallel

29. On what terminal do you check amperage?
Inclined manometer
20 degrees F
Common
15% silphos

30. On what terminal do you check amperage?
A diffuser
It also rises
Common
2 minutes

31. Can refrigerant line sets be altered in length?
Yes
Positive
15% silphos
High

32. What do you use to check for leaks?
It will be low
5 degrees
Nitrogen with a small amount of refrigerant
They are physically larger

33. Sections of duct board can be fastened together with what?
Staples and tape
30 degrees F
They are larger
Inside diameter (ID)

34. What kind of copper tubing is used for refrigeration or air-conditioning applications?
15 A
5 degrees
ACR (air-conditioning refrigeration) tubing
2

35. How many amps can 10 g wire handle?
Before the vent
30 A
It will be low
In series

36. What is the design boiling point for most evaporator coils in residential air conditioning?
18 gauge
25-ft or 50-ft
40 degrees F
15 A

37. How many amps can 8 g wire handle?
A piston type metering device
40 A
Any amount
6

38. Does a package unit come from the factory pre-charged?
Any amount
Static pressure - velocity pressure - and total pressure
Yes
A bypass duct or a dump zone

39. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Infiltration and ventilation
Subtract ambient temperature from 100
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
They are physically larger

40. 10' round duct has a ballpark cfm of what?
Vapor
A dirty evaporator
A diffuser
400

41. What gauge is thermostat wire?
18 gauge
Latent and sensible
40 A
Yes

42. How many amps can 10 g wire handle?
TXV
In parallel
30 A
Yes

43. What are the three major power-consuming devices on an air-conditioning system?
Pull a vacuum
Belt drive and direct drive
It will be high
Indoor fan motor - outdoor fan motor - and the compressor

44. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
400
40 degrees F
When the system is under pressure
It will have a decrease in superheat

45. Does a package unit come from the factory pre-charged?
105 degrees F
Yes
Inclined manometer
Over/under and side by side

46. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
105 degrees F
A piston type metering device
Pistons

47. How will too much refrigerant effect superheat?
100 psig
High
It will be low
Inclined manometer

48. How are round ducts supported?

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49. What is the typical pressure differance across a TXV?
100 psig
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Pi x radius squared
Boil the liquid refrigerant out ot the oil within the crankcase

50. How is flexible duct supported?
L-type
A band 4 inches or more in width
45 degrees F
TXV