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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. 8' round duct has a ballpark cfm of what?
25-ft or 50-ft
Heat load
200
12000

2. How many amps can 12 g wire handle?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
20 A
Pi x radius squared
A bypass duct or a dump zone

3. In what state is the refrigerant in the compressor?
Belt drive and direct drive
Individual return air systems and central return air systems
Before the vent
Vapor

4. What sort of pressure will a pull-through evaporator have?
Negative
A piston type metering device
Shorted winding - open winding - and grounded winding
Pull a vacuum

5. 13 SEER is classified as what kind of efficiency?
High
Potential relay and start capacitor
False
Over 800 degrees F

6. At what temperature does refrigerant condense in a standard-efficiency unit?
6
Pull a vacuum
30-35 degrees above ambient
Boil the liquid refrigerant out ot the oil within the crankcase

7. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
40 degrees F
Yes
20 A

8. What is the name of the fitting where the branch line leaves the duct?
Yes
ACR (air-conditioning refrigeration) tubing
The takeoff fitting
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

9. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
In series
45 degrees F
They are physically larger
Latent and sensible

10. How is insulation around a duct rated?
300
With an are rating
It rises
Indoor fan motor - outdoor fan motor - and the compressor

11. Why are some ACR tubing lines insulated?
High
False
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
RLA/FLA x 5

12. What are the two ways that fresh air enters a structure?
Yes
100 psig
Heat load
Infiltration and ventilation

13. What kind of copper tubing is used for plumbing and heating applications?
ACR (air-conditioning refrigeration) tubing
Any amount
8
Nominal-sized tubing

14. If pressure rises - what happens to the superheat?
20 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
It rises
Individual return air systems and central return air systems

15. If the rpm's are 750 - how many poles does the motor have?
No
8
Belt drive and direct drive
100

16. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
45 degrees F
1/4'
Yes
True

17. Can refrigerant line sets be altered in length?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
With 4' saddles
Yes
6

18. If the rpm's are 750 - how many poles does the motor have?
Potential relay and start capacitor
2
8
Btu/hr (output) / wattage (input)

19. If the rpm's are 1050 - how many poles does the motor have?
400
30 A
6
40 degrees F

20. How do you calculate cfm?

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21. What are the four materials used to make duct?
A diffuser
Pi x radius squared
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Infiltration and ventilation

22. What are the three major power-consuming devices on an air-conditioning system?
Duct with insulation on the inside
8-12 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
A dirty evaporator

23. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
When it is a pull-through evaporator
True
Pull a vacuum
5 degrees

24. Which type of wire can handle a higher ampacity?
400
Standard
18 gauge
Stranded

25. Where is insulation used on copper tubing used for air-conditioning?
15 A
Potential relay and start capacitor
The suction line or the low-pressure side
Infiltration and ventilation

26. Does a package unit come from the factory pre-charged?
Yes
Shorted winding - open winding - and grounded winding
1/4'
15% silphos

27. If the rpm's are 1750 - how many poles does the motor have?
4
20 degrees above ambient
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Compressor

28. How do you achieve high-efficiency?
It will have a decrease in superheat
Over/under and side by side
The takeoff fitting
By increasing the surface of the condenser coil

29. How do you calculate the area of a circle?
400
Yes
Pi x radius squared
Suction

30. Will a dirty condenser cause a rise or fall in pressure?
Rise
15% silphos
A swaging tool
Inclined manometer

31. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
40 degrees F
Duct - electrical - and mechanical
A bypass duct or a dump zone

32. What tool is used to expand the diameter of soft copper tubing
A swaging tool
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
They are physically larger
Slugging

33. What tool is used to expand the diameter of soft copper tubing
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Latent and sensible
A swaging tool
30-35 degrees above ambient

34. How is the high pressure switch wired with the low pressure switch?
The takeoff fitting
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
In parallel
They are larger

35. 9' round duct has a ballpark cfm of what?
12000
300
No
Fiberglass

36. How are round ducts supported?

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37. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
20 A
12000
Inside diameter (ID)

38. 7' round duct has a ballpark cfm of what?
It will have a decrease in superheat
Nitrogen with a small amount of refrigerant
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
150

39. What is the range for normal superheat and subcooling?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
8-12 degrees F
Static pressure - velocity pressure - and total pressure
A piston type metering device

40. How do you calculate ballpark superheat?
15 A
Subtract ambient temperature from 100
Inclined manometer
4

41. What are the three major power-consuming devices on an air-conditioning system?
15% silphos
SEER includes the energy used in the start-up and shut-down cycles
400
Indoor fan motor - outdoor fan motor - and the compressor

42. How will too much refrigerant effect superheat?
It will be low
Common
The takeoff fitting
When the system is under pressure

43. How are the condenser coils different on a high-efficiency unit?
They are physically larger
They are larger
A swaging tool
By increasing the surface of the condenser coil

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

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45. How is nominal-sized tubing sized?
Inside diameter (ID)
The takeoff fitting
1/4'
Infiltration and ventilation

46. What percentage silver do you need to use for an are-410 system?
Staples and tape
15% silphos
TXV
Average feet per minute X area in square feet (H' x W'/144)

47. At what temperature will soft solder melt?
150
Below 800 degrees F
A dirty evaporator
A band 4 inches or more in width

48. What is the typical pressure differance across a TXV?
100 psig
It will be high
Nitrogen with a small amount of refrigerant
Before the vent

49. Sections of duct board can be fastened together with what?
When the system is under pressure
400
Staples and tape
45-55%

50. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
Heat load
TXV
Outside diameter (OD)