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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 normal conditions - as defined by the ARI.
On the common terminal
Subtract ambient temperature from 100
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
True

2. On what terminal do you check amperage?
Compressor
Common
Yes
No

3. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Stranded
Any amount
30 degrees F
400

4. How will too much refrigerant effect superheat?
It will be low
S-clips and drives (cleats)
Yes
Individual return air systems and central return air systems

5. If pressure rises - what happens to the superheat?
Suction
It also rises
By increasing the surface of the condenser coil
It rises

6. How is insulation around a duct rated?
The takeoff fitting
Belt drive and direct drive
TXV
With an are rating

7. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
It will have a decrease in superheat
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
High

8. What distributes supply air to a room in a structure?
A diffuser
The takeoff fitting
Yes
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

9. Do you need a vent on a push-through evaporator?
Yes
25-ft or 50-ft
45 degrees F
20 degrees above ambient

10. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
6
It will have a decrease in superheat
20 degrees F
To remove humidity and lower dry bulb temperature

11. How are the condenser coils different on a high-efficiency unit?
A swaging tool
Yes
They are larger
ACR (air-conditioning refrigeration) tubing

12. The compressor is cooled by liquid refrigerant. (True of False)
TXV
Belt drive and direct drive
TXV
False

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

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14. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Dehydrated with caps on each end
Shorted winding - open winding - and grounded winding
A bypass duct or a dump zone
45 degrees F

15. The fan switch closes at what temperature?
Below 800 degrees F
By increasing the surface of the condenser coil
140 degrees F
L-type

16. What are the three crafts normally associated with an air-conditioned installation?
By increasing the surface of the condenser coil
Duct - electrical - and mechanical
40 A
1/4'

17. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
Fiberglass
It also rises
105 degrees F

18. What is the typical pressure differance across a TXV?
False
20 A
100 psig
TXV

19. What are the two types of blower drives?
On the common terminal
Belt drive and direct drive
Inclined manometer
Yes

20. What kind of metering device do high-efficiency units usually use?
Pull a vacuum
TXV
Before the vent
20 A

21. At what temperature does refrigerant condense in a high-efficiency unit?
Rise
20 degrees above ambient
Latent and sensible
A dirty evaporator

22. What are the three crafts normally associated with an air-conditioned installation?
RLA/FLA x 5
High
Duct - electrical - and mechanical
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

23. The fan switch opens at what temperature?
Heat loss
Infiltration and ventilation
105 degrees F
High

24. If pressure rises - what happens to the superheat?
5 degrees
They are physically larger
Stranded
It rises

25. What sort of pressure will a pull-through evaporator have?
1/4'
Negative
100
RLA/FLA x 5

26. How are round ducts connected to one another?
40 A
With a minimum of three evenly spaced self-tapping screws
Yes
A piston type metering device

27. How do you calculate cfm?

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28. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Inside diameter (ID)
Nominal-sized tubing
5 degrees
L-type

29. If the rpm's are 750 - how many poles does the motor have?
Any amount
SEER includes the energy used in the start-up and shut-down cycles
45 degrees F
8

30. How long should you leave a system off once you kill power before restarting it?
2 minutes
Any amount
Duct with insulation on the inside
On the common terminal

31. Which type of wire can handle a higher ampacity?
True
TXV
Side-by-side and over-and-under
Stranded

32. At what temperature will soft solder melt?
Average feet per minute X area in square feet (H' x W'/144)
Outside of the male fitting
Below 800 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

33. What is the design boiling point for most evaporator coils in residential air conditioning?
Before the vent
40 degrees F
High
A bypass duct or a dump zone

34. What percentage silver do you need to use for an are-410 system?
15% silphos
Positive
15 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

35. How is the high pressure switch wired with the low pressure switch?
5 degrees
TXV
4
In parallel

36. How does ACR copper pipe come?
No
Dehydrated with caps on each end
It will be low
Nitrogen with a small amount of refrigerant

37. If the rpm's are 1050 - how many poles does the motor have?
Dehydrated with caps on each end
6
Duct with insulation on the inside
ACR (air-conditioning refrigeration) tubing

38. If the suction pressure rises - what happens to the head pressure?
It also rises
With a minimum of three evenly spaced self-tapping screws
The suction line or the low-pressure side
A piston type metering device

39. 13 SEER is classified as what kind of efficiency?
Latent and sensible
High
It will be low
Heat loss

40. What is the name of the fitting where the branch line leaves the duct?
RLA/FLA x 5
The takeoff fitting
Over/under and side by side
It will be high

41. What kind of copper tubing is used for refrigeration or air-conditioning applications?
A band 4 inches or more in width
20 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
ACR (air-conditioning refrigeration) tubing

42. What are the two types of package units?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
15% silphos
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Side-by-side and over-and-under

43. What tool is used to expand the diameter of soft copper tubing
It will be low
Suction
A swaging tool
Infiltration and ventilation

44. Superheat should never be below how many degrees
Shorted winding - open winding - and grounded winding
5 degrees
Individual return air systems and central return air systems
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

45. The A/C size is calculated by what?
Outside of the male fitting
Heat load
By increasing the surface of the condenser coil
With a minimum of three evenly spaced self-tapping screws

46. Will a dirty condenser cause a rise or fall in pressure?
1/4'
Boil the liquid refrigerant out ot the oil within the crankcase
Rise
TXV

47. How do you calculate cfm?

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48. How are the condenser coils different on a high-efficiency unit?
They are larger
Staples and tape
40 A
30 A

49. When must a copper joint never be soldered or brazed?
Compressor
4
Rise
When the system is under pressure

50. How do you achieve high-efficiency?
6
A diffuser
Average feet per minute X area in square feet (H' x W'/144)
By increasing the surface of the condenser coil