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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. Do you need a vent on a push-through evaporator?
Heat loss
They are physically larger
Yes
20 A

2. Where do you apply flux when soldering?
Nitrogen with a small amount of refrigerant
Outside of the male fitting
It will be high
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

3. What is used to measure static air pressure in ducts.
100 psig
A bypass duct or a dump zone
Inclined manometer
Positive

4. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
Duct - electrical - and mechanical
Positive
ACR (air-conditioning refrigeration) tubing

5. When do you install an auxillary drain pan?
High
When it is above a conditioned space
100 psig
400

6. How many cfm per ton?
400
By increasing the surface of the condenser coil
When it is a pull-through evaporator
When it is a pull-through evaporator

7. Do you need a trap on a push-through evaporator?
Fiberglass
No
Static pressure - velocity pressure - and total pressure
A diffuser

8. How many cfm per ton?
Static pressure - velocity pressure - and total pressure
TXV
Side-by-side and over-and-under
400

9. What are normal conditions - as defined by the ARI.
Negative
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It will be high
Yes

10. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
Below 800 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
40 degrees F

11. Why are some ACR tubing lines insulated?
They are physically larger
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Suction
Duct - electrical - and mechanical

12. How do you calculate LRA?
6
With a minimum of three evenly spaced self-tapping screws
RLA/FLA x 5
200

13. At what temperature does refrigerant condense in a high-efficiency unit?
Infiltration and ventilation
Potential relay and start capacitor
20 degrees above ambient
400

14. 7' round duct has a ballpark cfm of what?
A piston type metering device
2
8
150

15. If the rpm's are 3450 - how many poles does the motor have?
False
2
Dehydrated with caps on each end
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

16. How do you calculate ballpark superheat?
Heat load
Duct - electrical - and mechanical
Fiberglass
Subtract ambient temperature from 100

17. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A band 4 inches or more in width
A bypass duct or a dump zone
Stranded
L-type

18. How is nominal-sized tubing sized?
Pull a vacuum
By increasing the surface of the condenser coil
Inside diameter (ID)
Belt drive and direct drive

19. The load on the evaporater will effect which pressure?
The suction line or the low-pressure side
With an are rating
It also rises
Suction

20. Which type of wire can handle a higher ampacity?
Stranded
Inclined manometer
15 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

21. What sort of pressure will a push-through evaporator have?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Vapor
When it is a pull-through evaporator
Positive

22. What are the four materials used to make duct?
Static pressure - velocity pressure - and total pressure
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
When it is a pull-through evaporator
They are physically larger

23. How will too much refrigerant effect subcooling?
Yes
105 degrees F
It will be high
40 degrees F

24. At what temperature will brazing melt?
Inches of water column (in. WC)
When it is a pull-through evaporator
100
Over 800 degrees F

25. Can refrigerant line sets be altered in length?
Nitrogen with a small amount of refrigerant
Yes
Negative
Stranded

26. If the rpm's are 1750 - how many poles does the motor have?
Compressor
15 A
4
A swaging tool

27. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants
Subtract ambient temperature from 100

28. How is the high pressure switch wired with the low pressure switch?
Slugging
30 degrees F
In parallel
Fiberglass

29. What are the two types of return air systems in residential installations?
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants
With 4' saddles
Individual return air systems and central return air systems

30. What are the three crafts normally associated with an air-conditioned installation?
Compressor
Duct - electrical - and mechanical
They are larger
Outside diameter (OD)

31. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Belt drive and direct drive
ACR (air-conditioning refrigeration) tubing
Any amount
30 degrees F

32. How are round ducts connected to one another?
S-clips and drives (cleats)
Over/under and side by side
Vapor
With a minimum of three evenly spaced self-tapping screws

33. What is the design boiling point for most evaporator coils in residential air conditioning?
Static pressure - velocity pressure - and total pressure
A bypass duct or a dump zone
40 degrees F
Any amount

34. The load on the evaporater will effect which pressure?
Yes
To lower the amount of pressure drop through the coil
Suction
Inclined manometer

35. What sort of pressure will a pull-through evaporator have?
Pi x radius squared
To remove humidity and lower dry bulb temperature
Below 800 degrees F
Negative

36. The crankcase heater on an air-conditioning compressor is used to what?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
SEER includes the energy used in the start-up and shut-down cycles
Boil the liquid refrigerant out ot the oil within the crankcase
Pi x radius squared

37. What do you use to check for leaks?
Staples and tape
Below 800 degrees F
Nitrogen with a small amount of refrigerant
Before the vent

38. The fan switch opens at what temperature?
105 degrees F
8-12 degrees F
8-12 degrees F
It will have a decrease in superheat

39. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
High
True
TXV
Belt drive and direct drive

40. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Over 800 degrees F
A band 4 inches or more in width
30 A

41. 6' round duct has a ballpark cfm of what?
Dehydrated with caps on each end
25-ft or 50-ft
The suction line or the low-pressure side
100

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

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43. What is it called when liquid refrigerant gets into the compressor?
45-55%
Negative
Slugging
20 degrees F

44. What sort of pressure will a pull-through evaporator have?
Suction
Negative
Nitrogen with a small amount of refrigerant
With 4' saddles

45. If the rpm's are 3450 - how many poles does the motor have?
15 A
A swaging tool
The suction line or the low-pressure side
2

46. The A/C size is calculated by what?
Heat load
By increasing the surface of the condenser coil
Below 800 degrees F
Inside diameter (ID)

47. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
6
High
8-12 degrees F
It will have a decrease in superheat

48. Most duct insulation is made of what?
100 psig
To lower the amount of pressure drop through the coil
2
Fiberglass

49. When do you install an auxillary drain pan?
In series
Belt drive and direct drive
When it is above a conditioned space
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

50. If pressure rises - what happens to the superheat?
By increasing the surface of the condenser coil
A band 4 inches or more in width
6
It rises