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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 are the three pressures created by moving air in ductwork?
Average feet per minute X area in square feet (H' x W'/144)
Static pressure - velocity pressure - and total pressure
200
Common

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

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3. Which type of wire can handle a higher ampacity?
Suction
Stranded
Outside of the male fitting
To remove humidity and lower dry bulb temperature

4. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
Heat loss
40 A
30 A

5. What is used to measure static air pressure in ducts.
Inclined manometer
Duct - electrical - and mechanical
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Dehydrated with caps on each end

6. What do you do after you braze a system?
Pull a vacuum
2 minutes
Boil the liquid refrigerant out ot the oil within the crankcase
Shorted winding - open winding - and grounded winding

7. When must a copper joint never be soldered or brazed?
When the system is under pressure
Negative
105 degrees F
Slugging

8. How is flexible duct supported?
Negative
40 A
SEER includes the energy used in the start-up and shut-down cycles
A band 4 inches or more in width

9. What kind of copper tubing is used for refrigeration or air-conditioning applications?
In series
ACR (air-conditioning refrigeration) tubing
400
To remove humidity and lower dry bulb temperature

10. How do you calculate LRA?
Positive
Nominal-sized tubing
Heat load
RLA/FLA x 5

11. What is the typical pressure differance across a TXV?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
15% silphos
100 psig
Positive

12. If the rpm's are 1050 - how many poles does the motor have?
On the common terminal
Slugging
6
Staples and tape

13. How many amps can 12 g wire handle?
4
Fiberglass
Belt drive and direct drive
20 A

14. How do you calculate cfm?

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15. The A/C size is calculated by what?
30 degrees F
To remove humidity and lower dry bulb temperature
Heat load
When it is a pull-through evaporator

16. What is the difference between SEER and EER?
A swaging tool
In series
SEER includes the energy used in the start-up and shut-down cycles
Before the vent

17. How is nominal-sized tubing sized?
Duct with insulation on the inside
Inside diameter (ID)
Inches of water column (in. WC)
Nominal-sized tubing

18. What sort of pressure will a push-through evaporator have?
40 A
On the common terminal
A diffuser
Positive

19. 13 SEER is classified as what kind of efficiency?
High
Individual return air systems and central return air systems
300
100 psig

20. Does a package unit come from the factory pre-charged?
12000
100
2 minutes
Yes

21. What type of air conditioning system must be charged using the superheat method?
Any amount
A piston type metering device
4
Slugging

22. How is insulation around a duct rated?
With an are rating
Before the vent
When it is above a conditioned space
400

23. If the rpm's are 750 - how many poles does the motor have?
Fiberglass
Static pressure - velocity pressure - and total pressure
100
8

24. How long should you leave a system off once you kill power before restarting it?
105 degrees F
Potential relay and start capacitor
2 minutes
15 A

25. What kind of metering device do high-efficiency units usually use?
30 degrees F
4
TXV
Stranded

26. How are round ducts connected to one another?
Outside of the male fitting
With a minimum of three evenly spaced self-tapping screws
Static pressure - velocity pressure - and total pressure
True

27. Pressure in ductwork is measured In what?
Pull a vacuum
Inches of water column (in. WC)
6
8

28. How do you calculate LRA?
Latent and sensible
100 psig
RLA/FLA x 5
Compressor

29. How do you calculate EER?
It rises
Btu/hr (output) / wattage (input)
TXV
Potential relay and start capacitor

30. What is the typical pressure differance across a TXV?
Standard
4
100 psig
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

31. 10' round duct has a ballpark cfm of what?
True
The suction line or the low-pressure side
100
400

32. If the rpm's are 750 - how many poles does the motor have?
Heat load
Inclined manometer
A band 4 inches or more in width
8

33. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
40 A
Fiberglass
SEER includes the energy used in the start-up and shut-down cycles
It will have a decrease in superheat

34. Sections of duct board can be fastened together with what?
Yes
Staples and tape
2 minutes
Yes

35. If the rpm's are 3450 - how many poles does the motor have?
2
200
A band 4 inches or more in width
Yes

36. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
18 gauge
In series
105 degrees F
A piston type metering device

37. The fan switch closes at what temperature?
RLA/FLA x 5
140 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Nitrogen with a small amount of refrigerant

38. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
2
Side-by-side and over-and-under
15% silphos

39. 8' round duct has a ballpark cfm of what?
Indoor fan motor - outdoor fan motor - and the compressor
200
2 minutes
Fiberglass

40. What distributes supply air to a room in a structure?
Heat loss
140 degrees F
Average feet per minute X area in square feet (H' x W'/144)
A diffuser

41. How do you calculate ballpark superheat?
Pi x radius squared
Subtract ambient temperature from 100
With a minimum of three evenly spaced self-tapping screws
5 degrees

42. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
It will have a decrease in superheat
Nitrogen with a small amount of refrigerant
With a minimum of three evenly spaced self-tapping screws

43. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Heat load
True
Suction
It will have a decrease in superheat

44. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
When it is above a conditioned space
40 degrees F
A diffuser

45. What is the normal evaporator temperature?
Compressor
45 degrees F
With a minimum of three evenly spaced self-tapping screws
When it is a pull-through evaporator

46. The compressor is cooled by liquid refrigerant. (True of False)
False
8
It rises
Side-by-side and over-and-under

47. What are the two functions of the air-conditioning system?
15 A
When it is above a conditioned space
To remove humidity and lower dry bulb temperature
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

48. Where do you install a trap on a drain line?
Compressor
6
Before the vent
It will be high

49. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
True
Before the vent
Negative

50. 10' round duct has a ballpark cfm of what?
30 degrees F
400
Outside diameter (OD)
Dehydrated with caps on each end