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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. 8' round duct has a ballpark cfm of what?
200
In series
A piston type metering device
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

2. How is nominal-sized tubing sized?
S-clips and drives (cleats)
Nitrogen with a small amount of refrigerant
Inside diameter (ID)
Belt drive and direct drive

3. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
12000
A swaging tool
6

4. If pressure rises - what happens to the superheat?
It will be low
It rises
15% silphos
Over/under and side by side

5. What is the normal evaporator temperature?
45 degrees F
A diffuser
With a minimum of three evenly spaced self-tapping screws
100

6. Where is insulation used on copper tubing used for air-conditioning?
Pi x radius squared
S-clips and drives (cleats)
The suction line or the low-pressure side
TXV

7. How are round ducts supported?

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8. How is nominal-sized tubing sized?
Inside diameter (ID)
Inclined manometer
Before the vent
They are physically larger

9. When do you install an auxillary drain pan?
With an are rating
Blended refrigerants
With a minimum of three evenly spaced self-tapping screws
When it is above a conditioned space

10. What are the two basic duct connection configurations for package units supply and return air ducts?
TXV
Positive
Over/under and side by side
Outside of the male fitting

11. Do you need a trap on a push-through evaporator?
Over 800 degrees F
30 degrees F
With 4' saddles
No

12. How do you calculate EER?
100
True
Btu/hr (output) / wattage (input)
A swaging tool

13. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Indoor fan motor - outdoor fan motor - and the compressor
Side-by-side and over-and-under
ACR (air-conditioning refrigeration) tubing
Latent and sensible

14. The evaporator is designed to remove what two types of heat?
Common
Latent and sensible
Pistons
2 minutes

15. How is insulation around a duct rated?
Shorted winding - open winding - and grounded winding
Vapor
With an are rating
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

16. What is a package unit?
2
Inside diameter (ID)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
L-type

17. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
It will be high
It will be low
Subtract ambient temperature from 100

18. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
On the common terminal
L-type
To remove humidity and lower dry bulb temperature
40 degrees F

19. What are the three crafts normally associated with an air-conditioned installation?
15% silphos
Static pressure - velocity pressure - and total pressure
A dirty evaporator
Duct - electrical - and mechanical

20. How are the condenser coils different on a high-efficiency unit?
5 degrees
They are larger
45-55%
In parallel

21. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Btu/hr (output) / wattage (input)
They are physically larger
Individual return air systems and central return air systems

22. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Yes
Standard
30 A

23. If the rpm's are 1750 - how many poles does the motor have?
The takeoff fitting
They are larger
2
4

24. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
30 A
They are larger
In series
Average feet per minute X area in square feet (H' x W'/144)

25. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
On the common terminal
True
2 minutes

26. How are round ducts supported?

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27. The fan switch opens at what temperature?
By increasing the surface of the condenser coil
5 degrees
105 degrees F
Outside of the male fitting

28. Do you need a trap on a pull-through evaporator?
Heat loss
Yes
40 degrees F
The suction line or the low-pressure side

29. Superheat should never be below how many degrees
Negative
Pistons
5 degrees
Standard

30. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
TXV
40 degrees F
Duct - electrical - and mechanical

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

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32. How does ACR copper pipe come?
Dehydrated with caps on each end
12000
Outside of the male fitting
300

33. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
Boil the liquid refrigerant out ot the oil within the crankcase
No
To lower the amount of pressure drop through the coil

34. What is considered normal operating conditions?
No
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
False
6

35. What type of air conditioning system must be charged using the superheat method?
Vapor
A piston type metering device
Yes
12000

36. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
40 degrees F
In series
2

37. How many amps can 10 g wire handle?
L-type
30 A
By increasing the surface of the condenser coil
Potential relay and start capacitor

38. What is it called when liquid refrigerant gets into the compressor?
Slugging
RLA/FLA x 5
Below 800 degrees F
Vapor

39. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Pull a vacuum
6
Nitrogen with a small amount of refrigerant
True

40. What is the range for normal superheat and subcooling?
L-type
It rises
In series
8-12 degrees F

41. What is the typical pressure differance across a TXV?
Before the vent
L-type
Static pressure - velocity pressure - and total pressure
100 psig

42. Where do you install a trap on a drain line?
15% silphos
Positive
5 degrees
Before the vent

43. What is lined duct?
It will be low
ACR (air-conditioning refrigeration) tubing
Heat load
Duct with insulation on the inside

44. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Potential relay and start capacitor
40 A
30 degrees F
Infiltration and ventilation

45. Do you need a trap on a pull-through evaporator?
Btu/hr (output) / wattage (input)
Yes
To lower the amount of pressure drop through the coil
Compressor

46. What is the design boiling point for most evaporator coils in residential air conditioning?
Pi x radius squared
30 A
100 psig
40 degrees F

47. Do you need a trap on a push-through evaporator?
Standard
No
Inclined manometer
1/4'

48. What is it called when liquid refrigerant gets into the compressor?
Over/under and side by side
Slugging
Latent and sensible
Pi x radius squared

49. How are the condenser coils different on a high-efficiency unit?
The takeoff fitting
False
They are larger
Nitrogen with a small amount of refrigerant

50. At what temperature will soft solder melt?
Latent and sensible
Vapor
It rises
Below 800 degrees F