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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 is the high pressure switch wired with the low pressure switch?
Positive
100 psig
In parallel
Inches of water column (in. WC)

2. What gauge is thermostat wire?
18 gauge
A bypass duct or a dump zone
Latent and sensible
It will be high

3. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
True
Duct - electrical - and mechanical
Inches of water column (in. WC)

4. What kind of metering device do high-efficiency units usually use?
Inside diameter (ID)
Rise
TXV
To lower the amount of pressure drop through the coil

5. Superheat should never be below how many degrees
15% silphos
Nitrogen with a small amount of refrigerant
5 degrees
Stranded

6. 9' round duct has a ballpark cfm of what?
20 degrees F
Standard
Nitrogen with a small amount of refrigerant
300

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

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8. How do you calculate the area of a circle?
No
They are larger
Pi x radius squared
Fiberglass

9. How is ACR tubing sized?
Average feet per minute X area in square feet (H' x W'/144)
Outside diameter (OD)
Average feet per minute X area in square feet (H' x W'/144)
They are larger

10. What is used to measure static air pressure in ducts.
150
40 degrees F
Inclined manometer
Blended refrigerants

11. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
8
20 A
Any amount
300

12. What is the difference between SEER and EER?
TXV
It will have a decrease in superheat
SEER includes the energy used in the start-up and shut-down cycles
S-clips and drives (cleats)

13. What are the two types of return air systems in residential installations?
Any amount
40 degrees F
150
Individual return air systems and central return air systems

14. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Individual return air systems and central return air systems
140 degrees F
20 degrees F

15. In what state is the refrigerant in the compressor?
Vapor
Inside diameter (ID)
105 degrees F
Negative

16. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
The suction line or the low-pressure side
Yes
Heat load

17. What is lined duct?
Suction
20 A
40 degrees F
Duct with insulation on the inside

18. Superheat should never be below how many degrees
With a minimum of three evenly spaced self-tapping screws
Subtract ambient temperature from 100
25-ft or 50-ft
5 degrees

19. The fan switch closes at what temperature?
Nominal-sized tubing
Any amount
140 degrees F
30-35 degrees above ambient

20. What is used to measure static air pressure in ducts.
Heat load
With a minimum of three evenly spaced self-tapping screws
S-clips and drives (cleats)
Inclined manometer

21. If the rpm's are 750 - how many poles does the motor have?
Btu/hr (output) / wattage (input)
Heat loss
8
The suction line or the low-pressure side

22. How do you calculate LRA?
RLA/FLA x 5
No
In parallel
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

23. What is the normal evaporator temperature?
They are physically larger
A swaging tool
45 degrees F
RLA/FLA x 5

24. What is the typical pressure differance across a TXV?
100 psig
150
Negative
By increasing the surface of the condenser coil

25. The furnace size is calculated by what?
Standard
Heat loss
By increasing the surface of the condenser coil
RLA/FLA x 5

26. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
Dehydrated with caps on each end
25-ft or 50-ft
Indoor fan motor - outdoor fan motor - and the compressor

27. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
It will have a decrease in superheat
45 degrees F
L-type

28. At what temperature will brazing melt?
Belt drive and direct drive
Slugging
Over 800 degrees F
Fiberglass

29. When do you install an auxillary drain pan?
150
When it is above a conditioned space
Before the vent
25-ft or 50-ft

30. 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
A piston type metering device
Boil the liquid refrigerant out ot the oil within the crankcase
150

31. 9' round duct has a ballpark cfm of what?
300
Subtract ambient temperature from 100
Belt drive and direct drive
Before the vent

32. When must a copper joint never be soldered or brazed?
Side-by-side and over-and-under
When the system is under pressure
Heat loss
When it is above a conditioned space

33. 6' round duct has a ballpark cfm of what?
With 4' saddles
With an are rating
Any amount
100

34. What distributes supply air to a room in a structure?
It will have a decrease in superheat
20 A
6
A diffuser

35. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
ACR (air-conditioning refrigeration) tubing
Btu/hr (output) / wattage (input)
Slugging

36. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
Blended refrigerants
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Subtract ambient temperature from 100

37. Which type of wire can handle a higher ampacity?
Stranded
Compressor
40 degrees F
Static pressure - velocity pressure - and total pressure

38. Will a dirty condenser cause a rise or fall in pressure?
By increasing the surface of the condenser coil
With 4' saddles
Rise
A dirty evaporator

39. Do you need a vent on a pull-through evaporator?
25-ft or 50-ft
Standard
2 minutes
Yes

40. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
6
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A dirty evaporator
40 degrees F

41. The fan switch closes at what temperature?
No
140 degrees F
The suction line or the low-pressure side
True

42. What sort of pressure will a pull-through evaporator have?
400
Negative
A diffuser
They are larger

43. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Rise
Inclined manometer
20 A

44. If the rpm's are 1050 - how many poles does the motor have?
105 degrees F
A dirty evaporator
6
400

45. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
2 minutes
Negative
25-ft or 50-ft

46. Do you need a trap on a pull-through evaporator?
A diffuser
Indoor fan motor - outdoor fan motor - and the compressor
Yes
The takeoff fitting

47. What are the two types of package units?
Staples and tape
1/4'
Pull a vacuum
Side-by-side and over-and-under

48. How do you calculate EER?
Negative
Btu/hr (output) / wattage (input)
18 gauge
Inches of water column (in. WC)

49. The A/C size is calculated by what?
Blended refrigerants
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Heat load
To lower the amount of pressure drop through the coil

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