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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 will too much refrigerant effect subcooling?
To lower the amount of pressure drop through the coil
Negative
With 4' saddles
It will be high

2. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
1/4'
To remove humidity and lower dry bulb temperature
Average feet per minute X area in square feet (H' x W'/144)

3. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
Belt drive and direct drive
Indoor fan motor - outdoor fan motor - and the compressor
Latent and sensible

4. Do you need a trap on a push-through evaporator?
2 minutes
Below 800 degrees F
To lower the amount of pressure drop through the coil
No

5. How are round ducts supported?

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6. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
140 degrees F
300
Subtract ambient temperature from 100

7. When do you install a trap on a drain line?
Outside diameter (OD)
2 minutes
When it is a pull-through evaporator
Blended refrigerants

8. The fan switch opens at what temperature?
45 degrees F
A swaging tool
105 degrees F
Average feet per minute X area in square feet (H' x W'/144)

9. How are round ducts supported?

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10. What is the range for normal superheat and subcooling?
TXV
8-12 degrees F
Suction
Stranded

11. How are the condenser coils different on a high-efficiency unit?
To remove humidity and lower dry bulb temperature
Inclined manometer
They are larger
25-ft or 50-ft

12. What are the two types of return air systems in residential installations?
When it is above a conditioned space
RLA/FLA x 5
6
Individual return air systems and central return air systems

13. Which is more efficient - a TXV or a fixed-orifice metering device?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
TXV
15 A
40 degrees F

14. How many amps can 14 g wire handle?
40 degrees F
15 A
Belt drive and direct drive
Common

15. Sections of duct board can be fastened together with what?
Slugging
200
Staples and tape
With an are rating

16. At what temperature will brazing melt?
Yes
4
Yes
Over 800 degrees F

17. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Nitrogen with a small amount of refrigerant
TXV
Pistons

18. What sort of pressure will a push-through evaporator have?
Pull a vacuum
Inside diameter (ID)
Positive
400

19. Do you need a vent on a pull-through evaporator?
The takeoff fitting
Yes
On the common terminal
Rise

20. 8' round duct has a ballpark cfm of what?
200
ACR (air-conditioning refrigeration) tubing
Heat loss
Pi x radius squared

21. What are the three pressures created by moving air in ductwork?
20 degrees above ambient
Static pressure - velocity pressure - and total pressure
Inches of water column (in. WC)
Any amount

22. What component changes refrigerant from a low pressure gas to a high pressure gas?
A band 4 inches or more in width
100
Outside of the male fitting
Compressor

23. What are the two types of blower drives?
Compressor
Belt drive and direct drive
Inside diameter (ID)
Duct with insulation on the inside

24. What are the three major power-consuming devices on an air-conditioning system?
Subtract ambient temperature from 100
Indoor fan motor - outdoor fan motor - and the compressor
When it is a pull-through evaporator
It rises

25. Do you need a trap on a push-through evaporator?
TXV
No
A piston type metering device
Inches of water column (in. WC)

26. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
By increasing the surface of the condenser coil
TXV
Any amount
Stranded

27. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
With a minimum of three evenly spaced self-tapping screws
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
2

28. Will a dirty condenser cause a rise or fall in pressure?
15 A
Rise
Staples and tape
Latent and sensible

29. The A/C size is calculated by what?
Shorted winding - open winding - and grounded winding
With an are rating
With 4' saddles
Heat load

30. What are the four materials used to make duct?
With 4' saddles
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
4
Compressor

31. In what length rolls is soft copper tubing normally available?
Outside of the male fitting
25-ft or 50-ft
Individual return air systems and central return air systems
A bypass duct or a dump zone

32. What type of air conditioning system must be charged using the superheat method?
300
A piston type metering device
15% silphos
ACR (air-conditioning refrigeration) tubing

33. What are the two basic duct connection configurations for package units supply and return air ducts?
ACR (air-conditioning refrigeration) tubing
Over/under and side by side
Indoor fan motor - outdoor fan motor - and the compressor
Pistons

34. What are the three ways a motor can fail electrically?
8-12 degrees F
Shorted winding - open winding - and grounded winding
105 degrees F
15% silphos

35. Which type of wire can handle a higher ampacity?
They are larger
Stranded
Before the vent
Dehydrated with caps on each end

36. What kind of metering device do high-efficiency units usually use?
40 degrees F
L-type
A dirty evaporator
TXV

37. What distributes supply air to a room in a structure?
Inches of water column (in. WC)
Blended refrigerants
A diffuser
Outside diameter (OD)

38. How is ACR tubing sized?
Yes
True
8-12 degrees F
Outside diameter (OD)

39. How is the high pressure switch wired with the low pressure switch?
On the common terminal
Suction
Positive
In parallel

40. What do you use to connect square and rectangular ductboard together?
TXV
S-clips and drives (cleats)
Negative
Slugging

41. What are the two ways that fresh air enters a structure?
It also rises
Boil the liquid refrigerant out ot the oil within the crankcase
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Infiltration and ventilation

42. What percentage silver do you need to use for an are-410 system?
Subtract ambient temperature from 100
On the common terminal
15% silphos
Yes

43. If the rpm's are 3450 - how many poles does the motor have?
2
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
To lower the amount of pressure drop through the coil
TXV

44. What type of air conditioning system must be charged using the superheat method?
With an are rating
Potential relay and start capacitor
Before the vent
A piston type metering device

45. What sort of pressure will a pull-through evaporator have?
In series
Heat loss
Negative
105 degrees F

46. How do you calculate the area of a circle?
Before the vent
Individual return air systems and central return air systems
Pi x radius squared
Duct with insulation on the inside

47. The fan switch opens at what temperature?
Infiltration and ventilation
150
Slugging
105 degrees F

48. What is used to measure static air pressure in ducts.
Rise
Inclined manometer
8-12 degrees F
Slugging

49. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
Compressor
4
L-type

50. At what temperature does refrigerant condense in a high-efficiency unit?
105 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
20 degrees above ambient
30-35 degrees above ambient