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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 sort of pressure will a pull-through evaporator have?
In parallel
105 degrees F
Negative
15% silphos

2. What can cause a decrease in suction pressure on an air-conditioning system?
15 A
A dirty evaporator
L-type
They are physically larger

3. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
Common
5 degrees
False

4. Where do you apply flux when soldering?
Yes
Outside of the male fitting
Standard
Pi x radius squared

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

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6. What sort of pressure will a push-through evaporator have?
Positive
Compressor
RLA/FLA x 5
Outside diameter (OD)

7. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
12000
6
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

8. How are round ducts supported?

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9. At what temperature will soft solder melt?
Potential relay and start capacitor
25-ft or 50-ft
False
Below 800 degrees F

10. How many amps can 8 g wire handle?
Pull a vacuum
40 A
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
It will be low

11. How many amps can 10 g wire handle?
30 A
100 psig
400
Potential relay and start capacitor

12. How do you calculate the area of a circle?
Standard
8-12 degrees F
Pi x radius squared
Rise

13. If pressure rises - what happens to the superheat?
Shorted winding - open winding - and grounded winding
To remove humidity and lower dry bulb temperature
It rises
4

14. How many amps can 8 g wire handle?
40 A
Belt drive and direct drive
20 A
400

15. What are the three major power-consuming devices on an air-conditioning system?
In parallel
150
Indoor fan motor - outdoor fan motor - and the compressor
In parallel

16. What are the three pressures created by moving air in ductwork?
Individual return air systems and central return air systems
Suction
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Static pressure - velocity pressure - and total pressure

17. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Suction
Heat load
When it is a pull-through evaporator

18. What distributes supply air to a room in a structure?
L-type
TXV
The suction line or the low-pressure side
A diffuser

19. Superheat should never be below how many degrees
5 degrees
Outside of the male fitting
True
Suction

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

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21. How is flexible duct supported?
A band 4 inches or more in width
In series
Btu/hr (output) / wattage (input)
Pi x radius squared

22. Where do you apply flux when soldering?
Outside of the male fitting
A dirty evaporator
Yes
25-ft or 50-ft

23. How many amps can 12 g wire handle?
20 A
Pull a vacuum
150
300

24. What gauge is thermostat wire?
30-35 degrees above ambient
The suction line or the low-pressure side
Outside of the male fitting
18 gauge

25. How is nominal-sized tubing sized?
To lower the amount of pressure drop through the coil
140 degrees F
Inside diameter (ID)
Infiltration and ventilation

26. How will too much refrigerant effect subcooling?
A diffuser
Yes
It will be high
SEER includes the energy used in the start-up and shut-down cycles

27. What is used to measure static air pressure in ducts.
A piston type metering device
150
Inclined manometer
1/4'

28. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Side-by-side and over-and-under
RLA/FLA x 5
It will have a decrease in superheat
Shorted winding - open winding - and grounded winding

29. What is the difference between SEER and EER?
A diffuser
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants
Btu/hr (output) / wattage (input)

30. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Dehydrated with caps on each end
45-55%
It will be low

31. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A bypass duct or a dump zone
Outside diameter (OD)
False

32. Where do you check the amps on a motor?
5 degrees
On the common terminal
No
Over/under and side by side

33. Which is more efficient - a TXV or a fixed-orifice metering device?
Yes
20 A
TXV
With an are rating

34. At what temperature does refrigerant condense in a high-efficiency unit?
Subtract ambient temperature from 100
20 degrees above ambient
With an are rating
Duct with insulation on the inside

35. In what state is the refrigerant in the compressor?
They are larger
Vapor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
RLA/FLA x 5

36. How many BTU's per ton?
Nominal-sized tubing
Standard
Static pressure - velocity pressure - and total pressure
12000

37. Does a package unit come from the factory pre-charged?
Yes
18 gauge
Inside diameter (ID)
Duct - electrical - and mechanical

38. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
SEER includes the energy used in the start-up and shut-down cycles
Slugging
Positive

39. What kind of copper tubing is used for plumbing and heating applications?
Individual return air systems and central return air systems
Nominal-sized tubing
20 A
100 psig

40. At what temperature will brazing melt?
The takeoff fitting
Over 800 degrees F
12000
In series

41. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
Inclined manometer
200
400

42. What kind of metering device do high-efficiency units usually use?
A dirty evaporator
Belt drive and direct drive
TXV
Stranded

43. How is the high pressure switch wired with the low pressure switch?
105 degrees F
Blended refrigerants
140 degrees F
In parallel

44. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
Inches of water column (in. WC)
Yes
Btu/hr (output) / wattage (input)

45. What is considered normal operating conditions?
20 A
It will be low
It rises
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

46. What percentage silver do you need to use for an are-410 system?
Below 800 degrees F
4
40 degrees F
15% silphos

47. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
Potential relay and start capacitor
Pistons
Yes

48. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
Belt drive and direct drive
Common
40 degrees F

49. Where is insulation used on copper tubing used for air-conditioning?
30 A
The suction line or the low-pressure side
ACR (air-conditioning refrigeration) tubing
20 degrees F

50. How does ACR copper pipe come?
30 A
Dehydrated with caps on each end
Compressor
100 psig