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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 kind of copper tubing is used for plumbing and heating applications?
Duct with insulation on the inside
Positive
Nominal-sized tubing
A swaging tool

2. 8' round duct has a ballpark cfm of what?
Infiltration and ventilation
200
Blended refrigerants
140 degrees F

3. When do you install an auxillary drain pan?
When it is above a conditioned space
Over 800 degrees F
Fiberglass
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

4. Do you need a vent on a push-through evaporator?
Rise
L-type
Yes
No

5. Where is insulation used on copper tubing used for air-conditioning?
Nitrogen with a small amount of refrigerant
False
The suction line or the low-pressure side
Pi x radius squared

6. How many cfm per ton?
Inclined manometer
Inches of water column (in. WC)
400
TXV

7. What is it called when liquid refrigerant gets into the compressor?
Slugging
Indoor fan motor - outdoor fan motor - and the compressor
Side-by-side and over-and-under
It will be high

8. Do you need a vent on a pull-through evaporator?
When it is above a conditioned space
6
Inside diameter (ID)
Yes

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

10. What are the components of a hard-start kit?
Potential relay and start capacitor
Indoor fan motor - outdoor fan motor - and the compressor
Infiltration and ventilation
Individual return air systems and central return air systems

11. What tool is used to expand the diameter of soft copper tubing
Rise
With 4' saddles
With a minimum of three evenly spaced self-tapping screws
A swaging tool

12. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
30 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
Yes
A bypass duct or a dump zone

13. How do you calculate EER?
Duct with insulation on the inside
High
Yes
Btu/hr (output) / wattage (input)

14. Do you need a trap on a pull-through evaporator?
Yes
150
40 A
400

15. What kind of metering device do high-efficiency units usually use?
TXV
It also rises
45 degrees F
Common

16. What sort of pressure will a pull-through evaporator have?
Indoor fan motor - outdoor fan motor - and the compressor
The takeoff fitting
Negative
A bypass duct or a dump zone

17. Most duct insulation is made of what?
6
Fiberglass
Nominal-sized tubing
20 degrees F

18. Do you need a trap on a push-through evaporator?
With an are rating
No
A diffuser
Side-by-side and over-and-under

19. How many BTU's per ton?
True
12000
RLA/FLA x 5
30-35 degrees above ambient

20. Where is insulation used on copper tubing used for air-conditioning?
TXV
True
The suction line or the low-pressure side
150

21. 10 SEER is classified as what kind of efficiency?
Rise
20 degrees above ambient
TXV
Standard

22. If the rpm's are 750 - how many poles does the motor have?
15% silphos
8
S-clips and drives (cleats)
A piston type metering device

23. What are the three crafts normally associated with an air-conditioned installation?
45-55%
Duct - electrical - and mechanical
It will be low
A band 4 inches or more in width

24. How many amps can 14 g wire handle?
S-clips and drives (cleats)
Outside of the male fitting
300
15 A

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

26. How long should you leave a system off once you kill power before restarting it?
2 minutes
It will be low
Negative
Any amount

27. At what temperature will soft solder melt?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Below 800 degrees F
It will have a decrease in superheat
Staples and tape

28. How are round ducts supported?

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29. The furnace size is calculated by what?
When the system is under pressure
Heat loss
Fiberglass
With an are rating

30. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
TXV
True

31. What can cause a decrease in suction pressure on an air-conditioning system?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A dirty evaporator
Pi x radius squared
Latent and sensible

32. What are the three pressures created by moving air in ductwork?
With 4' saddles
A piston type metering device
Negative
Static pressure - velocity pressure - and total pressure

33. What do you use to check for leaks?
A swaging tool
100 psig
Nitrogen with a small amount of refrigerant
Common

34. What is the normal evaporator temperature?
Over 800 degrees F
45 degrees F
True
Individual return air systems and central return air systems

35. Will a dirty condenser cause a rise or fall in pressure?
1/4'
5 degrees
Rise
No

36. What is the range for normal superheat and subcooling?
8-12 degrees F
TXV
Static pressure - velocity pressure - and total pressure
Yes

37. What are the two functions of the air-conditioning system?
On the common terminal
Standard
Over/under and side by side
To remove humidity and lower dry bulb temperature

38. How many BTU's per ton?
Dehydrated with caps on each end
RLA/FLA x 5
12000
Heat loss

39. On what terminal do you check amperage?
It rises
Pi x radius squared
Common
Static pressure - velocity pressure - and total pressure

40. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Vapor
20 degrees F
With 4' saddles
Any amount

41. How are round ducts supported?

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42. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
Inside diameter (ID)
Nominal-sized tubing
They are physically larger

43. What is the range for normal superheat and subcooling?
8-12 degrees F
18 gauge
40 degrees F
2

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

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45. What percentage silver do you need to use for an are-410 system?
15% silphos
Belt drive and direct drive
40 degrees F
Yes

46. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Belt drive and direct drive
In series
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Rise

47. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
20 degrees above ambient
It will have a decrease in superheat
Yes
With 4' saddles

48. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Staples and tape
8
False

49. What are the two types of return air systems in residential installations?
A diffuser
200
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Individual return air systems and central return air systems

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

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