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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 many amps can 10 g wire handle?
5 degrees
30 A
Belt drive and direct drive
It will have a decrease in superheat

2. When do you install an auxillary drain pan?
It also rises
When it is above a conditioned space
30 degrees F
Slugging

3. What is the normal evaporator temperature?
Nominal-sized tubing
When it is a pull-through evaporator
45 degrees F
5 degrees

4. What distributes supply air to a room in a structure?
A diffuser
Potential relay and start capacitor
Nominal-sized tubing
Rise

5. Why are some ACR tubing lines insulated?
In series
Heat loss
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

6. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
Nitrogen with a small amount of refrigerant
Infiltration and ventilation
Potential relay and start capacitor

7. 10' round duct has a ballpark cfm of what?
Inside diameter (ID)
Pistons
RLA/FLA x 5
400

8. What sort of pressure will a push-through evaporator have?
Positive
Yes
Heat load
Subtract ambient temperature from 100

9. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
4
20 degrees F
Subtract ambient temperature from 100
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

10. Most duct insulation is made of what?
Fiberglass
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Infiltration and ventilation
150

11. What are the two types of blower drives?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Belt drive and direct drive
A swaging tool
The suction line or the low-pressure side

12. Pressure in ductwork is measured In what?
Over/under and side by side
Inches of water column (in. WC)
400
Inclined manometer

13. The crankcase heater on an air-conditioning compressor is used to what?
When it is a pull-through evaporator
Subtract ambient temperature from 100
Boil the liquid refrigerant out ot the oil within the crankcase
Fiberglass

14. The A/C size is calculated by what?
18 gauge
Pistons
Heat load
RLA/FLA x 5

15. What is it called when liquid refrigerant gets into the compressor?
With a minimum of three evenly spaced self-tapping screws
Yes
Slugging
Blended refrigerants

16. What tool is used to expand the diameter of soft copper tubing
A swaging tool
S-clips and drives (cleats)
False
When it is a pull-through evaporator

17. The compressor is cooled by liquid refrigerant. (True of False)
Indoor fan motor - outdoor fan motor - and the compressor
False
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When the system is under pressure

18. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
Individual return air systems and central return air systems
40 degrees F
100

19. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
When the system is under pressure
Shorted winding - open winding - and grounded winding
8

20. If the rpm's are 3450 - how many poles does the motor have?
Latent and sensible
25-ft or 50-ft
20 degrees F
2

21. How are the condenser coils different on a high-efficiency unit?
Duct - electrical - and mechanical
They are larger
20 degrees F
It will have a decrease in superheat

22. If pressure rises - what happens to the superheat?
Any amount
It also rises
It rises
40 degrees F

23. What are the components of a hard-start kit?
Subtract ambient temperature from 100
Potential relay and start capacitor
Compressor
30-35 degrees above ambient

24. How many amps can 8 g wire handle?
Any amount
A bypass duct or a dump zone
40 A
20 A

25. How will too much refrigerant effect subcooling?
When it is a pull-through evaporator
12000
100
It will be high

26. What do you use to connect square and rectangular ductboard together?
Indoor fan motor - outdoor fan motor - and the compressor
Vapor
S-clips and drives (cleats)
Heat load

27. 13 SEER is classified as what kind of efficiency?
High
Negative
A piston type metering device
When the system is under pressure

28. 8' round duct has a ballpark cfm of what?
200
High
Blended refrigerants
40 degrees F

29. Where do you check the amps on a motor?
When it is above a conditioned space
On the common terminal
Pull a vacuum
15 A

30. 9' round duct has a ballpark cfm of what?
SEER includes the energy used in the start-up and shut-down cycles
Yes
40 A
300

31. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
25-ft or 50-ft
Standard
Common

32. Does a package unit come from the factory pre-charged?
Shorted winding - open winding - and grounded winding
False
A swaging tool
Yes

33. 7' round duct has a ballpark cfm of what?
Duct with insulation on the inside
150
When the system is under pressure
Suction

34. How is insulation around a duct rated?
With an are rating
Btu/hr (output) / wattage (input)
It also rises
2

35. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Common
Duct - electrical - and mechanical
Latent and sensible

36. What kind of metering device do high-efficiency units usually use?
Yes
Shorted winding - open winding - and grounded winding
TXV
Pi x radius squared

37. What is the normal evaporator temperature?
45 degrees F
Rise
Yes
Yes

38. How is flexible duct supported?
Yes
A band 4 inches or more in width
Below 800 degrees F
Pull a vacuum

39. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
40 degrees F
Compressor
Outside of the male fitting

40. 9' round duct has a ballpark cfm of what?
Over 800 degrees F
1/4'
300
Negative

41. What kind of copper tubing is used for plumbing and heating applications?
45 degrees F
In series
To remove humidity and lower dry bulb temperature
Nominal-sized tubing

42. What percentage silver do you need to use for an are-410 system?
Potential relay and start capacitor
1/4'
RLA/FLA x 5
15% silphos

43. Which type of wire can handle a higher ampacity?
30 degrees F
Suction
Stranded
Below 800 degrees F

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

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45. The fan switch opens at what temperature?
6
Yes
105 degrees F
True

46. What sort of pressure will a push-through evaporator have?
High
Positive
Yes
100

47. What sort of pressure will a pull-through evaporator have?
Boil the liquid refrigerant out ot the oil within the crankcase
Negative
Over/under and side by side
Nominal-sized tubing

48. 8' round duct has a ballpark cfm of what?
When it is above a conditioned space
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
200
Individual return air systems and central return air systems

49. When do you install a trap on a drain line?
When it is a pull-through evaporator
It will be high
RLA/FLA x 5
Stranded

50. At what temperature will brazing melt?
Suction
Over 800 degrees F
150
When the system is under pressure