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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 kind of metering device do high-efficiency units usually use?
Nitrogen with a small amount of refrigerant
100
ACR (air-conditioning refrigeration) tubing
TXV

2. The evaporator is designed to remove what two types of heat?
12000
By increasing the surface of the condenser coil
Latent and sensible
Average feet per minute X area in square feet (H' x W'/144)

3. What are the three crafts normally associated with an air-conditioned installation?
15 A
When it is a pull-through evaporator
Rise
Duct - electrical - and mechanical

4. How do you calculate EER?
Static pressure - velocity pressure - and total pressure
A piston type metering device
Inside diameter (ID)
Btu/hr (output) / wattage (input)

5. How are round ducts supported?

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6. How do you calculate the area of a circle?
Shorted winding - open winding - and grounded winding
They are physically larger
Pi x radius squared
A dirty evaporator

7. Does a package unit come from the factory pre-charged?
Yes
Yes
Duct with insulation on the inside
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

8. What kind of copper tubing is used for refrigeration or air-conditioning applications?
A swaging tool
Fiberglass
ACR (air-conditioning refrigeration) tubing
105 degrees F

9. What tool is used to expand the diameter of soft copper tubing
A swaging tool
4
Below 800 degrees F
It will be high

10. What is the range for normal superheat and subcooling?
Inside diameter (ID)
It will be low
8-12 degrees F
To lower the amount of pressure drop through the coil

11. What sort of pressure will a pull-through evaporator have?
15% silphos
Negative
Below 800 degrees F
Fiberglass

12. Most duct insulation is made of what?
In parallel
A diffuser
Fiberglass
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

13. What are the three ways a motor can fail electrically?
Yes
20 A
Shorted winding - open winding - and grounded winding
Slugging

14. What are normal conditions - as defined by the ARI.
Yes
Dehydrated with caps on each end
To lower the amount of pressure drop through the coil
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

15. The crankcase heater on an air-conditioning compressor is used to what?
It will be high
Boil the liquid refrigerant out ot the oil within the crankcase
8
Suction

16. What kind of copper tubing is used for plumbing and heating applications?
The takeoff fitting
Nominal-sized tubing
It will have a decrease in superheat
Yes

17. What do you use to connect square and rectangular ductboard together?
TXV
40 degrees F
S-clips and drives (cleats)
When it is above a conditioned space

18. What is the normal evaporator temperature?
When it is above a conditioned space
400
45 degrees F
1/4'

19. Does a package unit come from the factory pre-charged?
Staples and tape
To lower the amount of pressure drop through the coil
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

20. What are the two types of package units?
A band 4 inches or more in width
8-12 degrees F
Side-by-side and over-and-under
A bypass duct or a dump zone

21. A reciprocating compressor has what sort of moving parts?
Rise
Any amount
Pistons
105 degrees F

22. How will too much refrigerant effect subcooling?
Blended refrigerants
High
It will be high
Yes

23. Superheat should never be below how many degrees
5 degrees
Before the vent
40 degrees F
6

24. 13 SEER is classified as what kind of efficiency?
When it is above a conditioned space
A piston type metering device
Vapor
High

25. What is used to measure static air pressure in ducts.
Boil the liquid refrigerant out ot the oil within the crankcase
Inclined manometer
40 degrees F
Over 800 degrees F

26. What tool is used to expand the diameter of soft copper tubing
RLA/FLA x 5
400
105 degrees F
A swaging tool

27. 6' round duct has a ballpark cfm of what?
5 degrees
150
100
A bypass duct or a dump zone

28. How do you calculate cfm?

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29. How do you calculate LRA?
Static pressure - velocity pressure - and total pressure
S-clips and drives (cleats)
1/4'
RLA/FLA x 5

30. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
L-type
Any amount
A diffuser

31. What do you do after you braze a system?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Pull a vacuum
On the common terminal
It will be low

32. What do you do after you braze a system?
When the system is under pressure
ACR (air-conditioning refrigeration) tubing
Pull a vacuum
100

33. How many BTU's per ton?
Yes
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
12000
Yes

34. At what temperature does refrigerant condense in a standard-efficiency unit?
Stranded
30-35 degrees above ambient
Slugging
RLA/FLA x 5

35. How do you calculate cfm?

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36. How is ACR tubing sized?
True
L-type
45-55%
Outside diameter (OD)

37. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
15% silphos
Staples and tape
Duct with insulation on the inside
45-55%

38. Sections of duct board can be fastened together with what?
Staples and tape
Inches of water column (in. WC)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Duct with insulation on the inside

39. What is a package unit?
They are larger
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
8-12 degrees F
TXV

40. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
400
It will be high
A diffuser

41. Where do you check the amps on a motor?
Side-by-side and over-and-under
Positive
105 degrees F
On the common terminal

42. How many amps can 14 g wire handle?
Potential relay and start capacitor
8
15 A
Yes

43. What is the normal evaporator temperature?
45 degrees F
Static pressure - velocity pressure - and total pressure
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
18 gauge

44. If the rpm's are 3450 - how many poles does the motor have?
2
With 4' saddles
A band 4 inches or more in width
High

45. What distributes supply air to a room in a structure?
2
When the system is under pressure
ACR (air-conditioning refrigeration) tubing
A diffuser

46. How is flexible duct supported?
400
Heat load
A band 4 inches or more in width
Blended refrigerants

47. What are the two types of package units?
Any amount
Side-by-side and over-and-under
Over 800 degrees F
30 degrees F

48. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
False
2 minutes
When the system is under pressure

49. What is considered normal operating conditions?
4
Nitrogen with a small amount of refrigerant
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

50. If the rpm's are 750 - how many poles does the motor have?
8
S-clips and drives (cleats)
Nominal-sized tubing
Boil the liquid refrigerant out ot the oil within the crankcase