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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?
In series
45-55%
S-clips and drives (cleats)
Before the vent

2. What are the three major power-consuming devices on an air-conditioning system?
To lower the amount of pressure drop through the coil
Indoor fan motor - outdoor fan motor - and the compressor
Fiberglass
Inclined manometer

3. Pressure in ductwork is measured In what?
By increasing the surface of the condenser coil
30 degrees F
It will have a decrease in superheat
Inches of water column (in. WC)

4. In what length rolls is soft copper tubing normally available?
In parallel
25-ft or 50-ft
30-35 degrees above ambient
15% silphos

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

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6. What are normal conditions - as defined by the ARI.
False
Dehydrated with caps on each end
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
150

7. Do you need a trap on a push-through evaporator?
Compressor
Heat load
No
Yes

8. How is flexible duct supported?
20 degrees above ambient
Below 800 degrees F
140 degrees F
A band 4 inches or more in width

9. What kind of copper tubing is used for plumbing and heating applications?
ACR (air-conditioning refrigeration) tubing
100
Nominal-sized tubing
Yes

10. At what temperature does refrigerant condense in a standard-efficiency unit?
Below 800 degrees F
30-35 degrees above ambient
Yes
No

11. How many amps can 12 g wire handle?
8-12 degrees F
20 A
Heat loss
Heat loss

12. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
ACR (air-conditioning refrigeration) tubing
A band 4 inches or more in width

13. What are the components of a hard-start kit?
Potential relay and start capacitor
Rise
RLA/FLA x 5
8

14. What kind of refrigeratnts must be added in liquid form?
Yes
Inside diameter (ID)
Blended refrigerants
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

15. Do you need a trap on a pull-through evaporator?
Yes
Inches of water column (in. WC)
Common
No

16. What do you do after you braze a system?
Outside diameter (OD)
400
Positive
Pull a vacuum

17. The furnace size is calculated by what?
S-clips and drives (cleats)
Suction
Average feet per minute X area in square feet (H' x W'/144)
Heat loss

18. Does a package unit come from the factory pre-charged?
When it is above a conditioned space
Yes
Vapor
Inside diameter (ID)

19. Where is insulation used on copper tubing used for air-conditioning?
Static pressure - velocity pressure - and total pressure
The suction line or the low-pressure side
Outside diameter (OD)
A dirty evaporator

20. The compressor is cooled by liquid refrigerant. (True of False)
Standard
False
30-35 degrees above ambient
It will be low

21. How is insulation around a duct rated?
With an are rating
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Rise
The suction line or the low-pressure side

22. 13 SEER is classified as what kind of efficiency?
Average feet per minute X area in square feet (H' x W'/144)
High
Inclined manometer
40 degrees F

23. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
400
Indoor fan motor - outdoor fan motor - and the compressor
45 degrees F

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

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25. Which is more efficient - a TXV or a fixed-orifice metering device?
4
When it is above a conditioned space
When the system is under pressure
TXV

26. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
RLA/FLA x 5
L-type
Outside diameter (OD)

27. What is used to measure static air pressure in ducts.
Boil the liquid refrigerant out ot the oil within the crankcase
Inclined manometer
S-clips and drives (cleats)
They are physically larger

28. Where do you check the amps on a motor?
Common
On the common terminal
12000
100

29. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
150
15% silphos
TXV
To lower the amount of pressure drop through the coil

30. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
Yes
Negative
Btu/hr (output) / wattage (input)

31. Where do you apply flux when soldering?
Outside of the male fitting
12000
Positive
To lower the amount of pressure drop through the coil

32. How long should you leave a system off once you kill power before restarting it?
High
Static pressure - velocity pressure - and total pressure
2 minutes
18 gauge

33. When do you install a trap on a drain line?
Duct with insulation on the inside
Slugging
When it is a pull-through evaporator
Dehydrated with caps on each end

34. Where do you install a trap on a drain line?
Before the vent
When it is above a conditioned space
Below 800 degrees F
A swaging tool

35. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
40 degrees F
It will be low
30 degrees F

36. What are the two basic duct connection configurations for package units supply and return air ducts?
Yes
Inclined manometer
Fiberglass
Over/under and side by side

37. What is a package unit?
They are larger
In parallel
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

38. Sections of duct board can be fastened together with what?
200
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Staples and tape
It also rises

39. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
140 degrees F
Dehydrated with caps on each end
30-35 degrees above ambient

40. How do you achieve high-efficiency?
20 degrees F
By increasing the surface of the condenser coil
Inside diameter (ID)
Duct with insulation on the inside

41. What are the two types of return air systems in residential installations?
A piston type metering device
5 degrees
Yes
Individual return air systems and central return air systems

42. Can refrigerant line sets be altered in length?
Yes
On the common terminal
Potential relay and start capacitor
Heat load

43. At what temperature will brazing melt?
In parallel
Over 800 degrees F
Duct - electrical - and mechanical
A diffuser

44. The evaporator is designed to remove what two types of heat?
Latent and sensible
30 degrees F
With a minimum of three evenly spaced self-tapping screws
No

45. How do you achieve high-efficiency?
They are larger
When it is above a conditioned space
By increasing the surface of the condenser coil
400

46. What gauge is thermostat wire?
Vapor
A bypass duct or a dump zone
18 gauge
It will have a decrease in superheat

47. What is used to measure static air pressure in ducts.
300
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Inclined manometer
Rise

48. What is the typical pressure differance across a TXV?
Outside of the male fitting
Vapor
100 psig
Latent and sensible

49. If the rpm's are 3450 - how many poles does the motor have?
2
20 degrees F
A dirty evaporator
It will have a decrease in superheat

50. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
100
Before the vent
Inside diameter (ID)