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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. The A/C size is calculated by what?
6
When the system is under pressure
Heat load
30 A

2. Can refrigerant line sets be altered in length?
Yes
Heat load
It will be high
Staples and tape

3. In what length rolls is soft copper tubing normally available?
The takeoff fitting
It will have a decrease in superheat
Heat load
25-ft or 50-ft

4. When must a copper joint never be soldered or brazed?
When the system is under pressure
Blended refrigerants
It will have a decrease in superheat
Latent and sensible

5. What is considered normal operating conditions?
Yes
Boil the liquid refrigerant out ot the oil within the crankcase
105 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

6. Where do you check the amps on a motor?
Yes
Pistons
On the common terminal
30 A

7. How many amps can 10 g wire handle?
400
30 A
Inside diameter (ID)
Pull a vacuum

8. How long should you leave a system off once you kill power before restarting it?
No
False
2 minutes
40 A

9. If the suction pressure rises - what happens to the head pressure?
Pull a vacuum
6
It also rises
Positive

10. If pressure rises - what happens to the superheat?
It rises
L-type
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Any amount

11. How are round ducts supported?

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12. How are round ducts connected to one another?
Suction
Slugging
With a minimum of three evenly spaced self-tapping screws
Yes

13. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
Common
30 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

14. What are the two types of package units?
Before the vent
Side-by-side and over-and-under
A piston type metering device
A dirty evaporator

15. In what length rolls is soft copper tubing normally available?
It will have a decrease in superheat
Inclined manometer
25-ft or 50-ft
When it is a pull-through evaporator

16. How do you calculate LRA?
Inches of water column (in. WC)
They are larger
RLA/FLA x 5
It rises

17. What are the three pressures created by moving air in ductwork?
Yes
A dirty evaporator
Duct with insulation on the inside
Static pressure - velocity pressure - and total pressure

18. At what temperature does refrigerant condense in a standard-efficiency unit?
SEER includes the energy used in the start-up and shut-down cycles
To lower the amount of pressure drop through the coil
The suction line or the low-pressure side
30-35 degrees above ambient

19. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
High
8
30-35 degrees above ambient

20. Do you need a vent on a pull-through evaporator?
When it is a pull-through evaporator
Yes
It will be low
Fiberglass

21. The fan switch opens at what temperature?
Vapor
Yes
Staples and tape
105 degrees F

22. 8' round duct has a ballpark cfm of what?
8
1/4'
200
4

23. The furnace size is calculated by what?
To remove humidity and lower dry bulb temperature
Heat loss
4
Standard

24. What are the two types of blower drives?
Subtract ambient temperature from 100
Below 800 degrees F
Belt drive and direct drive
False

25. How do you calculate EER?
Duct with insulation on the inside
It will have a decrease in superheat
Btu/hr (output) / wattage (input)
Nominal-sized tubing

26. In what state is the refrigerant in the compressor?
It will be low
20 degrees F
Vapor
Yes

27. What are the two ways that fresh air enters a structure?
Below 800 degrees F
300
Infiltration and ventilation
Duct - electrical - and mechanical

28. Where do you apply flux when soldering?
Boil the liquid refrigerant out ot the oil within the crankcase
A dirty evaporator
40 A
Outside of the male fitting

29. On what terminal do you check amperage?
100
When the system is under pressure
Below 800 degrees F
Common

30. How is flexible duct supported?
Slugging
Nominal-sized tubing
A band 4 inches or more in width
30 A

31. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Yes
8-12 degrees F
With a minimum of three evenly spaced self-tapping screws

32. What are the two functions of the air-conditioning system?
It will be low
40 degrees F
300
To remove humidity and lower dry bulb temperature

33. 9' round duct has a ballpark cfm of what?
To lower the amount of pressure drop through the coil
4
12000
300

34. Which is more efficient - a TXV or a fixed-orifice metering device?
40 degrees F
Shorted winding - open winding - and grounded winding
TXV
40 degrees F

35. What percentage silver do you need to use for an are-410 system?
Subtract ambient temperature from 100
15% silphos
Potential relay and start capacitor
45-55%

36. How many amps can 8 g wire handle?
20 degrees above ambient
With 4' saddles
40 A
L-type

37. How will too much refrigerant effect superheat?
It will be low
They are larger
Fiberglass
400

38. What sort of pressure will a pull-through evaporator have?
Negative
A band 4 inches or more in width
It will be high
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

39. What is the range for normal superheat and subcooling?
8-12 degrees F
TXV
30 A
To remove humidity and lower dry bulb temperature

40. If the rpm's are 1050 - how many poles does the motor have?
Latent and sensible
6
Positive
A diffuser

41. What type of air conditioning system must be charged using the superheat method?
When the system is under pressure
Negative
20 degrees F
A piston type metering device

42. What is the typical pressure differance across a TXV?
15% silphos
In parallel
100 psig
They are physically larger

43. What is lined duct?
Duct with insulation on the inside
Outside of the male fitting
Heat load
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

44. 7' round duct has a ballpark cfm of what?
Duct with insulation on the inside
150
25-ft or 50-ft
A dirty evaporator

45. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
Nominal-sized tubing
30 degrees F
30 A

46. What gauge is thermostat wire?
SEER includes the energy used in the start-up and shut-down cycles
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
18 gauge
Stranded

47. How is nominal-sized tubing sized?
Inside diameter (ID)
It rises
Vapor
2

48. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
1/4'
20 degrees above ambient
6
45-55%

49. The compressor is cooled by liquid refrigerant. (True of False)
400
45 degrees F
False
Over/under and side by side

50. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
Static pressure - velocity pressure - and total pressure
L-type
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity