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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. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
40 A
High
Outside of the male fitting
In series

2. What component changes refrigerant from a low pressure gas to a high pressure gas?
Yes
Before the vent
Compressor
Before the vent

3. Will a dirty condenser cause a rise or fall in pressure?
1/4'
Rise
A swaging tool
Static pressure - velocity pressure - and total pressure

4. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
Btu/hr (output) / wattage (input)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
False

5. What are the three major power-consuming devices on an air-conditioning system?
Fiberglass
15 A
Indoor fan motor - outdoor fan motor - and the compressor
Common

6. The load on the evaporater will effect which pressure?
Latent and sensible
45-55%
When the system is under pressure
Suction

7. At what temperature does refrigerant condense in a high-efficiency unit?
It also rises
400
20 degrees above ambient
The suction line or the low-pressure side

8. When do you install an auxillary drain pan?
Outside diameter (OD)
Vapor
With an are rating
When it is above a conditioned space

9. What is the normal evaporator temperature?
45 degrees F
Yes
Below 800 degrees F
A swaging tool

10. The fan switch closes at what temperature?
It rises
140 degrees F
Duct - electrical - and mechanical
When the system is under pressure

11. 13 SEER is classified as what kind of efficiency?
High
Duct - electrical - and mechanical
A diffuser
The takeoff fitting

12. How are the condenser coils different on a high-efficiency unit?
Vapor
They are larger
True
It will be high

13. On what terminal do you check amperage?
Average feet per minute X area in square feet (H' x W'/144)
RLA/FLA x 5
Common
Inches of water column (in. WC)

14. If the rpm's are 1050 - how many poles does the motor have?
Common
Vapor
6
12000

15. How is the high pressure switch wired with the low pressure switch?
Yes
In parallel
8
Nominal-sized tubing

16. 10 SEER is classified as what kind of efficiency?
Standard
5 degrees
When it is a pull-through evaporator
Rise

17. How many amps can 12 g wire handle?
A band 4 inches or more in width
20 A
40 degrees F
Duct with insulation on the inside

18. What is it called when liquid refrigerant gets into the compressor?
Slugging
Infiltration and ventilation
The suction line or the low-pressure side
ACR (air-conditioning refrigeration) tubing

19. What are the two ways that fresh air enters a structure?
High
Infiltration and ventilation
100
A dirty evaporator

20. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
Boil the liquid refrigerant out ot the oil within the crankcase
30-35 degrees above ambient
When the system is under pressure

21. How many amps can 8 g wire handle?
Positive
45-55%
40 A
15% silphos

22. Do you need a vent on a pull-through evaporator?
Yes
SEER includes the energy used in the start-up and shut-down cycles
20 degrees above ambient
Nominal-sized tubing

23. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Btu/hr (output) / wattage (input)
40 degrees F
200
A bypass duct or a dump zone

24. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
A piston type metering device
In series
It will have a decrease in superheat
Indoor fan motor - outdoor fan motor - and the compressor

25. If the rpm's are 1750 - how many poles does the motor have?
4
Indoor fan motor - outdoor fan motor - and the compressor
Common
100

26. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Outside of the male fitting
It will be low
Outside of the male fitting
Any amount

27. How are round ducts supported?

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28. How is flexible duct supported?
A band 4 inches or more in width
With an are rating
Inside diameter (ID)
It will be high

29. What is the design boiling point for most evaporator coils in residential air conditioning?
Nominal-sized tubing
40 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Individual return air systems and central return air systems

30. What is the difference between SEER and EER?
4
2
8
SEER includes the energy used in the start-up and shut-down cycles

31. How is ACR tubing sized?
Pull a vacuum
Outside diameter (OD)
Duct - electrical - and mechanical
With a minimum of three evenly spaced self-tapping screws

32. How many cfm per ton?
400
Infiltration and ventilation
100 psig
15% silphos

33. What kind of copper tubing is used for plumbing and heating applications?
Vapor
20 A
100
Nominal-sized tubing

34. How will too much refrigerant effect superheat?
400
It will be low
8
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

35. What kind of metering device do high-efficiency units usually use?
30-35 degrees above ambient
TXV
False
Infiltration and ventilation

36. Do you need a trap on a push-through evaporator?
Slugging
A diffuser
No
Suction

37. At what temperature will soft solder melt?
Below 800 degrees F
Outside diameter (OD)
100
6

38. What do you use to check for leaks?
They are physically larger
Nitrogen with a small amount of refrigerant
TXV
Shorted winding - open winding - and grounded winding

39. What are the two types of blower drives?
False
Belt drive and direct drive
They are larger
Individual return air systems and central return air systems

40. What are the two types of package units?
20 A
Latent and sensible
Side-by-side and over-and-under
6

41. What tool is used to expand the diameter of soft copper tubing
A swaging tool
In series
TXV
4

42. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
25-ft or 50-ft
18 gauge
Inclined manometer

43. Sections of duct board can be fastened together with what?
Outside diameter (OD)
To lower the amount of pressure drop through the coil
Staples and tape
Potential relay and start capacitor

44. Why are some ACR tubing lines insulated?
Pi x radius squared
Blended refrigerants
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Inches of water column (in. WC)

45. What tool is used to expand the diameter of soft copper tubing
4
Infiltration and ventilation
Duct with insulation on the inside
A swaging tool

46. If pressure rises - what happens to the superheat?
Subtract ambient temperature from 100
It rises
Nitrogen with a small amount of refrigerant
Latent and sensible

47. What are the components of a hard-start kit?
6
Indoor fan motor - outdoor fan motor - and the compressor
L-type
Potential relay and start capacitor

48. What do you use to connect square and rectangular ductboard together?
A bypass duct or a dump zone
S-clips and drives (cleats)
It will be low
Outside diameter (OD)

49. How long should you leave a system off once you kill power before restarting it?
2 minutes
45-55%
Boil the liquid refrigerant out ot the oil within the crankcase
2

50. At what temperature does refrigerant condense in a standard-efficiency unit?
A dirty evaporator
30-35 degrees above ambient
Inclined manometer
Outside of the male fitting