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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. 10' round duct has a ballpark cfm of what?
Duct with insulation on the inside
400
Side-by-side and over-and-under
Heat load

2. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
TXV
In series
30-35 degrees above ambient
L-type

3. How do you calculate EER?
With 4' saddles
Btu/hr (output) / wattage (input)
When the system is under pressure
Indoor fan motor - outdoor fan motor - and the compressor

4. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
With a minimum of three evenly spaced self-tapping screws
Below 800 degrees F
In series
It also rises

5. Do you need a trap on a pull-through evaporator?
They are larger
Yes
High
Standard

6. The A/C size is calculated by what?
2
With a minimum of three evenly spaced self-tapping screws
Heat load
Indoor fan motor - outdoor fan motor - and the compressor

7. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Rise
With a minimum of three evenly spaced self-tapping screws
25-ft or 50-ft

8. If the rpm's are 1050 - how many poles does the motor have?
A swaging tool
False
6
Dehydrated with caps on each end

9. How many amps can 10 g wire handle?
A band 4 inches or more in width
High
TXV
30 A

10. On what terminal do you check amperage?
Standard
Common
False
A swaging tool

11. The crankcase heater on an air-conditioning compressor is used to what?
150
RLA/FLA x 5
Potential relay and start capacitor
Boil the liquid refrigerant out ot the oil within the crankcase

12. How do you calculate the area of a circle?
Stranded
2 minutes
Pi x radius squared
Duct with insulation on the inside

13. When do you install a trap on a drain line?
When it is a pull-through evaporator
Heat load
20 A
Suction

14. Sections of duct board can be fastened together with what?
Over/under and side by side
Staples and tape
No
100 psig

15. What sort of pressure will a pull-through evaporator have?
Side-by-side and over-and-under
When it is above a conditioned space
45 degrees F
Negative

16. At what temperature will brazing melt?
No
Over 800 degrees F
Heat load
Staples and tape

17. In what state is the refrigerant in the compressor?
A dirty evaporator
Duct with insulation on the inside
A bypass duct or a dump zone
Vapor

18. If the rpm's are 1050 - how many poles does the motor have?
Any amount
12000
25-ft or 50-ft
6

19. What are the four materials used to make duct?
To remove humidity and lower dry bulb temperature
105 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Duct - electrical - and mechanical

20. What are the two basic duct connection configurations for package units supply and return air ducts?
Outside of the male fitting
Over/under and side by side
Inclined manometer
8-12 degrees F

21. What are the three pressures created by moving air in ductwork?
To remove humidity and lower dry bulb temperature
With an are rating
30 A
Static pressure - velocity pressure - and total pressure

22. What percentage silver do you need to use for an are-410 system?
Latent and sensible
15% silphos
12000
By increasing the surface of the condenser coil

23. If the rpm's are 3450 - how many poles does the motor have?
Dehydrated with caps on each end
2
Heat load
Average feet per minute X area in square feet (H' x W'/144)

24. 6' round duct has a ballpark cfm of what?
100
TXV
150
200

25. 9' round duct has a ballpark cfm of what?
Outside diameter (OD)
300
20 degrees above ambient
Vapor

26. What is used to measure static air pressure in ducts.
With an are rating
8
Inclined manometer
Compressor

27. How many amps can 8 g wire handle?
A band 4 inches or more in width
40 A
Heat load
Indoor fan motor - outdoor fan motor - and the compressor

28. What is considered normal operating conditions?
300
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Nominal-sized tubing
Inside diameter (ID)

29. What do you use to check for leaks?
It also rises
Stranded
To lower the amount of pressure drop through the coil
Nitrogen with a small amount of refrigerant

30. How is flexible duct supported?
400
When it is above a conditioned space
A band 4 inches or more in width
A dirty evaporator

31. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Slugging
S-clips and drives (cleats)
20 degrees F
Inclined manometer

32. How is insulation around a duct rated?
It rises
40 A
150
With an are rating

33. How do you calculate ballpark superheat?
A band 4 inches or more in width
Subtract ambient temperature from 100
False
Slugging

34. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Nitrogen with a small amount of refrigerant
SEER includes the energy used in the start-up and shut-down cycles
It will have a decrease in superheat

35. What is a package unit?
40 degrees F
To lower the amount of pressure drop through the coil
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

36. 8' round duct has a ballpark cfm of what?
Outside diameter (OD)
Positive
200
It will be low

37. What do you do after you braze a system?
Pull a vacuum
100
Compressor
Blended refrigerants

38. A reciprocating compressor has what sort of moving parts?
Pistons
The suction line or the low-pressure side
It will be low
A bypass duct or a dump zone

39. Most duct insulation is made of what?
Duct - electrical - and mechanical
To remove humidity and lower dry bulb temperature
Blended refrigerants
Fiberglass

40. What sort of pressure will a push-through evaporator have?
When it is a pull-through evaporator
Positive
With an are rating
Standard

41. The load on the evaporater will effect which pressure?
Suction
2
The takeoff fitting
Inclined manometer

42. What percentage silver do you need to use for an are-410 system?
15% silphos
Stranded
Pull a vacuum
The suction line or the low-pressure side

43. What gauge is thermostat wire?
18 gauge
They are larger
By increasing the surface of the condenser coil
Before the vent

44. How are round ducts supported?

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45. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
A swaging tool
Over 800 degrees F
40 degrees F
Inches of water column (in. WC)

46. The furnace size is calculated by what?
40 degrees F
100 psig
Side-by-side and over-and-under
Heat loss

47. Does a package unit come from the factory pre-charged?
Before the vent
200
Yes
ACR (air-conditioning refrigeration) tubing

48. What is the typical pressure differance across a TXV?
They are physically larger
100 psig
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Rise

49. If the rpm's are 3450 - how many poles does the motor have?
2
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
The takeoff fitting
18 gauge

50. What can cause a decrease in suction pressure on an air-conditioning system?
TXV
300
Btu/hr (output) / wattage (input)
A dirty evaporator