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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 is lined duct?
Duct with insulation on the inside
By increasing the surface of the condenser coil
8-12 degrees F
20 degrees F

2. When do you install a trap on a drain line?
When it is a pull-through evaporator
Yes
On the common terminal
Over/under and side by side

3. What component changes refrigerant from a low pressure gas to a high pressure gas?
Below 800 degrees F
Compressor
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A bypass duct or a dump zone

4. What is the range for normal superheat and subcooling?
Nominal-sized tubing
Heat loss
8-12 degrees F
200

5. What distributes supply air to a room in a structure?
Suction
In series
A diffuser
Static pressure - velocity pressure - and total pressure

6. How is flexible duct supported?
400
Staples and tape
A band 4 inches or more in width
45 degrees F

7. How do you calculate cfm?

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8. What are the three ways a motor can fail electrically?
2 minutes
Inclined manometer
Duct - electrical - and mechanical
Shorted winding - open winding - and grounded winding

9. If the rpm's are 750 - how many poles does the motor have?
Staples and tape
Yes
8
30 degrees F

10. How is nominal-sized tubing sized?
18 gauge
40 degrees F
Inside diameter (ID)
A swaging tool

11. How is ACR tubing sized?
Outside diameter (OD)
Blended refrigerants
Average feet per minute X area in square feet (H' x W'/144)
Common

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

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13. What can cause a decrease in suction pressure on an air-conditioning system?
15% silphos
30 A
Inside diameter (ID)
A dirty evaporator

14. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
20 degrees F
To remove humidity and lower dry bulb temperature
30 degrees F
Vapor

15. How many amps can 12 g wire handle?
Compressor
20 degrees above ambient
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
20 A

16. What are normal conditions - as defined by the ARI.
With a minimum of three evenly spaced self-tapping screws
15 A
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Outside of the male fitting

17. What tool is used to expand the diameter of soft copper tubing
Individual return air systems and central return air systems
Indoor fan motor - outdoor fan motor - and the compressor
Side-by-side and over-and-under
A swaging tool

18. What are the two types of blower drives?
Belt drive and direct drive
Over 800 degrees F
A swaging tool
15% silphos

19. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Individual return air systems and central return air systems
False
12000
They are physically larger

20. At what temperature does refrigerant condense in a high-efficiency unit?
Static pressure - velocity pressure - and total pressure
20 degrees above ambient
30-35 degrees above ambient
400

21. 13 SEER is classified as what kind of efficiency?
High
Before the vent
A bypass duct or a dump zone
When the system is under pressure

22. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pi x radius squared
40 degrees F
140 degrees F

23. Why are some ACR tubing lines insulated?
When it is a pull-through evaporator
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A band 4 inches or more in width
Dehydrated with caps on each end

24. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
5 degrees
20 degrees F
A bypass duct or a dump zone
A piston type metering device

25. What are the three major power-consuming devices on an air-conditioning system?
20 degrees above ambient
TXV
S-clips and drives (cleats)
Indoor fan motor - outdoor fan motor - and the compressor

26. 10 SEER is classified as what kind of efficiency?
Standard
Staples and tape
Positive
Nominal-sized tubing

27. How do you achieve high-efficiency?
On the common terminal
Potential relay and start capacitor
By increasing the surface of the condenser coil
20 A

28. What is it called when liquid refrigerant gets into the compressor?
Slugging
Inches of water column (in. WC)
150
4

29. In what length rolls is soft copper tubing normally available?
Compressor
Outside of the male fitting
Latent and sensible
25-ft or 50-ft

30. How do you achieve high-efficiency?
45-55%
By increasing the surface of the condenser coil
40 degrees F
Nominal-sized tubing

31. What percentage silver do you need to use for an are-410 system?
15% silphos
2
A piston type metering device
40 degrees F

32. How are the condenser coils different on a high-efficiency unit?
They are larger
They are physically larger
Static pressure - velocity pressure - and total pressure
140 degrees F

33. What do you do after you braze a system?
30 A
Pull a vacuum
Heat loss
Positive

34. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Side-by-side and over-and-under
150
45 degrees F

35. What are the three major power-consuming devices on an air-conditioning system?
Rise
Over/under and side by side
It will be low
Indoor fan motor - outdoor fan motor - and the compressor

36. What are the three crafts normally associated with an air-conditioned installation?
140 degrees F
Duct - electrical - and mechanical
20 degrees above ambient
On the common terminal

37. Where do you install a trap on a drain line?
When it is a pull-through evaporator
140 degrees F
Outside diameter (OD)
Before the vent

38. How many cfm per ton?
400
Duct - electrical - and mechanical
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

39. Which is more efficient - a TXV or a fixed-orifice metering device?
140 degrees F
45 degrees F
TXV
8-12 degrees F

40. What is a package unit?
Positive
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Btu/hr (output) / wattage (input)
True

41. 9' round duct has a ballpark cfm of what?
Compressor
Belt drive and direct drive
With a minimum of three evenly spaced self-tapping screws
300

42. Will a dirty condenser cause a rise or fall in pressure?
Pistons
Rise
Inside diameter (ID)
When the system is under pressure

43. Pressure in ductwork is measured In what?
Duct with insulation on the inside
45 degrees F
Inches of water column (in. WC)
1/4'

44. If the rpm's are 1750 - how many poles does the motor have?
They are physically larger
In parallel
4
It also rises

45. How many BTU's per ton?
Pistons
12000
Belt drive and direct drive
Pull a vacuum

46. What are the two types of blower drives?
150
2 minutes
Stranded
Belt drive and direct drive

47. How do you calculate cfm?

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48. How are round ducts supported?

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49. What do you use to check for leaks?
Vapor
Nitrogen with a small amount of refrigerant
30 degrees F
18 gauge

50. Do you need a vent on a push-through evaporator?
5 degrees
Yes
Pull a vacuum
6