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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?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
In series
High
15 A

2. How many amps can 10 g wire handle?
Staples and tape
Btu/hr (output) / wattage (input)
30 A
TXV

3. What are the two ways that fresh air enters a structure?
It will be low
Infiltration and ventilation
The suction line or the low-pressure side
15 A

4. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
Standard
Pull a vacuum
S-clips and drives (cleats)

5. Superheat should never be below how many degrees
It rises
5 degrees
1/4'
40 degrees F

6. A reciprocating compressor has what sort of moving parts?
Pistons
30 A
Side-by-side and over-and-under
Rise

7. How is the high pressure switch wired with the low pressure switch?
Indoor fan motor - outdoor fan motor - and the compressor
In parallel
Before the vent
45 degrees F

8. How is ACR tubing sized?
Suction
RLA/FLA x 5
Compressor
Outside diameter (OD)

9. What are the four materials used to make duct?
Yes
Common
With an are rating
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

10. How many amps can 14 g wire handle?
15 A
5 degrees
150
Static pressure - velocity pressure - and total pressure

11. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Duct - electrical - and mechanical
Outside of the male fitting
Indoor fan motor - outdoor fan motor - and the compressor
To lower the amount of pressure drop through the coil

12. Does a package unit come from the factory pre-charged?
Before the vent
Yes
A dirty evaporator
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

13. How many amps can 12 g wire handle?
Individual return air systems and central return air systems
45-55%
20 A
SEER includes the energy used in the start-up and shut-down cycles

14. If the rpm's are 1050 - how many poles does the motor have?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
6
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
TXV

15. 8' round duct has a ballpark cfm of what?
Side-by-side and over-and-under
A dirty evaporator
40 degrees F
200

16. What sort of pressure will a push-through evaporator have?
With 4' saddles
Average feet per minute X area in square feet (H' x W'/144)
Positive
18 gauge

17. Where do you install a trap on a drain line?
Infiltration and ventilation
With 4' saddles
Pi x radius squared
Before the vent

18. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
Outside of the male fitting
45 degrees F
Pull a vacuum

19. When do you install an auxillary drain pan?
By increasing the surface of the condenser coil
25-ft or 50-ft
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
When it is above a conditioned space

20. At what temperature will brazing melt?
With 4' saddles
Over 800 degrees F
Nitrogen with a small amount of refrigerant
5 degrees

21. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
On the common terminal
5 degrees
Compressor

22. What sort of pressure will a push-through evaporator have?
6
They are physically larger
Positive
Belt drive and direct drive

23. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
With an are rating
Suction
40 degrees F
The takeoff fitting

24. The compressor is cooled by liquid refrigerant. (True of False)
Fiberglass
False
Inside diameter (ID)
Nominal-sized tubing

25. 6' round duct has a ballpark cfm of what?
Common
100
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
100 psig

26. Do you need a trap on a pull-through evaporator?
Inclined manometer
Belt drive and direct drive
12000
Yes

27. What sort of pressure will a pull-through evaporator have?
Negative
400
Outside of the male fitting
Heat loss

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

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29. What is used to measure static air pressure in ducts.
Inclined manometer
Duct with insulation on the inside
Blended refrigerants
45 degrees F

30. How are round ducts connected to one another?
It also rises
40 degrees F
Infiltration and ventilation
With a minimum of three evenly spaced self-tapping screws

31. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
Blended refrigerants
Negative
Any amount

32. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
100 psig
It will have a decrease in superheat
Dehydrated with caps on each end
18 gauge

33. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
S-clips and drives (cleats)
105 degrees F
6

34. The load on the evaporater will effect which pressure?
No
Suction
5 degrees
With 4' saddles

35. If the rpm's are 1750 - how many poles does the motor have?
20 A
4
Yes
Suction

36. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Btu/hr (output) / wattage (input)
15 A
In series
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

37. What are the three major power-consuming devices on an air-conditioning system?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Indoor fan motor - outdoor fan motor - and the compressor
To remove humidity and lower dry bulb temperature
Inclined manometer

38. How many amps can 8 g wire handle?
Before the vent
40 A
Rise
It rises

39. 7' round duct has a ballpark cfm of what?
It will be low
The takeoff fitting
150
Dehydrated with caps on each end

40. How is insulation around a duct rated?
18 gauge
Subtract ambient temperature from 100
TXV
With an are rating

41. The load on the evaporater will effect which pressure?
300
Side-by-side and over-and-under
25-ft or 50-ft
Suction

42. Where do you check the amps on a motor?
They are larger
Potential relay and start capacitor
Outside diameter (OD)
On the common terminal

43. How many amps can 8 g wire handle?
105 degrees F
Yes
40 A
300

44. How do you calculate LRA?
It rises
They are larger
RLA/FLA x 5
L-type

45. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
40 A
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws

46. Which is more efficient - a TXV or a fixed-orifice metering device?
200
TXV
Potential relay and start capacitor
15 A

47. Will a dirty condenser cause a rise or fall in pressure?
Rise
Latent and sensible
Slugging
Side-by-side and over-and-under

48. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
300
With an are rating
Pistons
True

49. What is the difference between SEER and EER?
400
SEER includes the energy used in the start-up and shut-down cycles
200
6

50. What gauge is thermostat wire?
Heat loss
18 gauge
25-ft or 50-ft
Nitrogen with a small amount of refrigerant