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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 component changes refrigerant from a low pressure gas to a high pressure gas?
To remove humidity and lower dry bulb temperature
Compressor
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Over 800 degrees F

2. How many amps can 8 g wire handle?
Pistons
40 A
In series
Pi x radius squared

3. 10' round duct has a ballpark cfm of what?
Over/under and side by side
40 A
400
RLA/FLA x 5

4. When do you install a trap on a drain line?
100 psig
Nitrogen with a small amount of refrigerant
When it is a pull-through evaporator
Vapor

5. Do you need a trap on a pull-through evaporator?
Yes
A band 4 inches or more in width
Positive
Outside diameter (OD)

6. How is the high pressure switch wired with the low pressure switch?
In parallel
Boil the liquid refrigerant out ot the oil within the crankcase
Inclined manometer
A bypass duct or a dump zone

7. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Shorted winding - open winding - and grounded winding
150
20 degrees above ambient
20 degrees F

8. When do you install a trap on a drain line?
It will be low
Yes
Rise
When it is a pull-through evaporator

9. What is the design boiling point for most evaporator coils in residential air conditioning?
Below 800 degrees F
ACR (air-conditioning refrigeration) tubing
40 degrees F
105 degrees F

10. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
Yes
6
30 A

11. The fan switch closes at what temperature?
TXV
140 degrees F
Before the vent
The takeoff fitting

12. What are the components of a hard-start kit?
Potential relay and start capacitor
400
100 psig
TXV

13. How does ACR copper pipe come?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Dehydrated with caps on each end
Negative
12000

14. How do you calculate EER?
Btu/hr (output) / wattage (input)
They are larger
It will be low
Negative

15. Why are some ACR tubing lines insulated?
Inches of water column (in. WC)
Stranded
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
True

16. What gauge is thermostat wire?
18 gauge
In series
100 psig
Inclined manometer

17. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
When it is a pull-through evaporator
A bypass duct or a dump zone
A band 4 inches or more in width
S-clips and drives (cleats)

18. At what temperature will brazing melt?
Before the vent
With an are rating
Pull a vacuum
Over 800 degrees F

19. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Staples and tape
Any amount
A piston type metering device
12000

20. How many amps can 12 g wire handle?
20 A
30-35 degrees above ambient
Yes
Yes

21. What are the three pressures created by moving air in ductwork?
Before the vent
Suction
Static pressure - velocity pressure - and total pressure
30-35 degrees above ambient

22. The evaporator is designed to remove what two types of heat?
Yes
1/4'
Latent and sensible
It also rises

23. The fan switch closes at what temperature?
ACR (air-conditioning refrigeration) tubing
8-12 degrees F
6
140 degrees F

24. What tool is used to expand the diameter of soft copper tubing
A bypass duct or a dump zone
200
140 degrees F
A swaging tool

25. Do you need a vent on a pull-through evaporator?
Yes
By increasing the surface of the condenser coil
S-clips and drives (cleats)
25-ft or 50-ft

26. The load on the evaporater will effect which pressure?
Inclined manometer
Suction
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Rise

27. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
Negative
Over 800 degrees F
105 degrees F

28. How long should you leave a system off once you kill power before restarting it?
Yes
Inside diameter (ID)
Infiltration and ventilation
2 minutes

29. What sort of pressure will a pull-through evaporator have?
Pull a vacuum
Negative
High
100 psig

30. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Indoor fan motor - outdoor fan motor - and the compressor
40 degrees F
Duct with insulation on the inside

31. What component changes refrigerant from a low pressure gas to a high pressure gas?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
12000
With a minimum of three evenly spaced self-tapping screws
Compressor

32. What is used to measure static air pressure in ducts.
Vapor
In series
Inclined manometer
Yes

33. How are round ducts supported?

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34. Will a dirty condenser cause a rise or fall in pressure?
45-55%
Rise
Boil the liquid refrigerant out ot the oil within the crankcase
A band 4 inches or more in width

35. How many amps can 10 g wire handle?
Yes
30 A
A band 4 inches or more in width
Inches of water column (in. WC)

36. What are the components of a hard-start kit?
Potential relay and start capacitor
40 degrees F
The takeoff fitting
Heat loss

37. The A/C size is calculated by what?
Below 800 degrees F
2
Heat load
L-type

38. When do you install an auxillary drain pan?
Static pressure - velocity pressure - and total pressure
Compressor
When it is above a conditioned space
Vapor

39. What kind of copper tubing is used for plumbing and heating applications?
A piston type metering device
Standard
Average feet per minute X area in square feet (H' x W'/144)
Nominal-sized tubing

40. 6' round duct has a ballpark cfm of what?
SEER includes the energy used in the start-up and shut-down cycles
Yes
100
Inches of water column (in. WC)

41. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
Indoor fan motor - outdoor fan motor - and the compressor
It rises
True

42. 10' round duct has a ballpark cfm of what?
400
25-ft or 50-ft
Outside of the male fitting
20 A

43. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
They are physically larger
100
Yes

44. What kind of copper tubing is used for refrigeration or air-conditioning applications?
A band 4 inches or more in width
Heat loss
ACR (air-conditioning refrigeration) tubing
Average feet per minute X area in square feet (H' x W'/144)

45. Do you need a trap on a push-through evaporator?
Yes
4
No
Yes

46. How is ACR tubing sized?
400
Inclined manometer
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Outside diameter (OD)

47. What is lined duct?
With 4' saddles
SEER includes the energy used in the start-up and shut-down cycles
300
Duct with insulation on the inside

48. At what temperature will soft solder melt?
With 4' saddles
Below 800 degrees F
The suction line or the low-pressure side
When the system is under pressure

49. How do you achieve high-efficiency?
Outside of the male fitting
By increasing the surface of the condenser coil
Before the vent
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

50. The compressor is cooled by liquid refrigerant. (True of False)
Individual return air systems and central return air systems
False
Heat load
20 A