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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 are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
400
Inclined manometer
15 A

2. What sort of pressure will a push-through evaporator have?
Duct - electrical - and mechanical
Positive
30 A
300

3. What are the three major power-consuming devices on an air-conditioning system?
The suction line or the low-pressure side
Indoor fan motor - outdoor fan motor - and the compressor
400
RLA/FLA x 5

4. When do you install an auxillary drain pan?
When it is a pull-through evaporator
When it is above a conditioned space
Blended refrigerants
12000

5. What distributes supply air to a room in a structure?
A diffuser
With a minimum of three evenly spaced self-tapping screws
Individual return air systems and central return air systems
Yes

6. How do you calculate ballpark superheat?
A dirty evaporator
Subtract ambient temperature from 100
SEER includes the energy used in the start-up and shut-down cycles
30-35 degrees above ambient

7. How many amps can 14 g wire handle?
Belt drive and direct drive
Side-by-side and over-and-under
150
15 A

8. The fan switch opens at what temperature?
105 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
100 psig
Side-by-side and over-and-under

9. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
S-clips and drives (cleats)
High
Duct - electrical - and mechanical
20 degrees F

10. What percentage silver do you need to use for an are-410 system?
15% silphos
4
2
S-clips and drives (cleats)

11. How many cfm per ton?
400
18 gauge
1/4'
Individual return air systems and central return air systems

12. If the rpm's are 1750 - how many poles does the motor have?
The takeoff fitting
4
Duct - electrical - and mechanical
A dirty evaporator

13. The A/C size is calculated by what?
30 degrees F
5 degrees
Individual return air systems and central return air systems
Heat load

14. How do you calculate EER?
Btu/hr (output) / wattage (input)
To remove humidity and lower dry bulb temperature
A band 4 inches or more in width
1/4'

15. What tool is used to expand the diameter of soft copper tubing
Nominal-sized tubing
A swaging tool
20 degrees above ambient
8

16. Where do you install a trap on a drain line?
Static pressure - velocity pressure - and total pressure
A dirty evaporator
Before the vent
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

17. If the rpm's are 1750 - how many poles does the motor have?
4
Vapor
400
Any amount

18. How is nominal-sized tubing sized?
Inside diameter (ID)
Dehydrated with caps on each end
It will be high
Over 800 degrees F

19. Which is more efficient - a TXV or a fixed-orifice metering device?
25-ft or 50-ft
Staples and tape
TXV
140 degrees F

20. How is ACR tubing sized?
Inches of water column (in. WC)
15% silphos
Outside diameter (OD)
Side-by-side and over-and-under

21. What are the components of a hard-start kit?
Shorted winding - open winding - and grounded winding
Potential relay and start capacitor
45-55%
Before the vent

22. How will too much refrigerant effect subcooling?
105 degrees F
200
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It will be high

23. Will a dirty condenser cause a rise or fall in pressure?
It also rises
Indoor fan motor - outdoor fan motor - and the compressor
Rise
Pistons

24. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
105 degrees F
Dehydrated with caps on each end
Negative
True

25. The compressor is cooled by liquid refrigerant. (True of False)
Heat load
Potential relay and start capacitor
Inches of water column (in. WC)
False

26. If pressure rises - what happens to the superheat?
Suction
It rises
30-35 degrees above ambient
2

27. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
30 degrees F
SEER includes the energy used in the start-up and shut-down cycles
With an are rating

28. What tool is used to expand the diameter of soft copper tubing
In series
It will be low
A swaging tool
Staples and tape

29. What are the three pressures created by moving air in ductwork?
Slugging
It will be low
Outside of the male fitting
Static pressure - velocity pressure - and total pressure

30. Do you need a vent on a push-through evaporator?
5 degrees
Any amount
TXV
Yes

31. The evaporator is designed to remove what two types of heat?
40 A
Latent and sensible
They are larger
Indoor fan motor - outdoor fan motor - and the compressor

32. What kind of copper tubing is used for plumbing and heating applications?
150
Shorted winding - open winding - and grounded winding
Nominal-sized tubing
Stranded

33. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Below 800 degrees F
140 degrees F
L-type
100 psig

34. Where do you install a trap on a drain line?
Positive
Before the vent
With an are rating
Blended refrigerants

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

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36. 10 SEER is classified as what kind of efficiency?
Standard
12000
Suction
Duct - electrical - and mechanical

37. How many amps can 14 g wire handle?
15 A
Before the vent
Compressor
L-type

38. What is it called when liquid refrigerant gets into the compressor?
TXV
Vapor
Slugging
Heat load

39. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
SEER includes the energy used in the start-up and shut-down cycles
Common
300

40. What is the range for normal superheat and subcooling?
8-12 degrees F
When the system is under pressure
6
L-type

41. The evaporator is designed to remove what two types of heat?
Btu/hr (output) / wattage (input)
20 degrees above ambient
Latent and sensible
Any amount

42. Do you need a vent on a push-through evaporator?
Yes
Fiberglass
In parallel
40 A

43. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
40 A
It will have a decrease in superheat
When the system is under pressure
Nitrogen with a small amount of refrigerant

44. What kind of refrigeratnts must be added in liquid form?
Inside diameter (ID)
Blended refrigerants
It also rises
It will be low

45. How is flexible duct supported?
300
A band 4 inches or more in width
To lower the amount of pressure drop through the coil
Vapor

46. Does a package unit come from the factory pre-charged?
False
Nominal-sized tubing
Indoor fan motor - outdoor fan motor - and the compressor
Yes

47. What are the two types of package units?
Blended refrigerants
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
20 degrees above ambient
Side-by-side and over-and-under

48. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
8
Belt drive and direct drive
Average feet per minute X area in square feet (H' x W'/144)
They are physically larger

49. The crankcase heater on an air-conditioning compressor is used to what?
25-ft or 50-ft
To lower the amount of pressure drop through the coil
Boil the liquid refrigerant out ot the oil within the crankcase
5 degrees

50. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
6
Nominal-sized tubing
Staples and tape