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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. Do you need a vent on a pull-through evaporator?
To remove humidity and lower dry bulb temperature
Heat loss
18 gauge
Yes

2. What type of air conditioning system must be charged using the superheat method?
25-ft or 50-ft
A piston type metering device
True
Infiltration and ventilation

3. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
By increasing the surface of the condenser coil
20 degrees F
400
30 degrees F

4. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
It also rises
Individual return air systems and central return air systems
Btu/hr (output) / wattage (input)

5. How do you calculate the area of a circle?
2
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Pi x radius squared
15 A

6. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
Nominal-sized tubing
Stranded
400

7. How are round ducts supported?

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8. Does a package unit come from the factory pre-charged?
When the system is under pressure
By increasing the surface of the condenser coil
Yes
18 gauge

9. What is used to measure static air pressure in ducts.
Inches of water column (in. WC)
In parallel
With an are rating
Inclined manometer

10. How do you calculate ballpark superheat?
Yes
A swaging tool
The takeoff fitting
Subtract ambient temperature from 100

11. In what state is the refrigerant in the compressor?
The takeoff fitting
Vapor
When the system is under pressure
40 A

12. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
When it is a pull-through evaporator
They are physically larger
25-ft or 50-ft
100 psig

13. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It will be low
Suction

14. Do you need a vent on a push-through evaporator?
Yes
It rises
When the system is under pressure
Blended refrigerants

15. At what temperature will brazing melt?
A swaging tool
Yes
15% silphos
Over 800 degrees F

16. How will too much refrigerant effect superheat?
8
It will be low
It will be high
A bypass duct or a dump zone

17. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
False
TXV
2 minutes

18. 10' round duct has a ballpark cfm of what?
Any amount
S-clips and drives (cleats)
400
It will be low

19. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
Shorted winding - open winding - and grounded winding
No
300

20. How do you calculate LRA?
400
Common
45-55%
RLA/FLA x 5

21. Will a dirty condenser cause a rise or fall in pressure?
105 degrees F
Rise
By increasing the surface of the condenser coil
Heat loss

22. When must a copper joint never be soldered or brazed?
When the system is under pressure
Yes
TXV
5 degrees

23. What percentage silver do you need to use for an are-410 system?
With an are rating
L-type
15% silphos
With a minimum of three evenly spaced self-tapping screws

24. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
20 degrees F
Over 800 degrees F
L-type
45-55%

25. How many amps can 12 g wire handle?
On the common terminal
Potential relay and start capacitor
20 A
To remove humidity and lower dry bulb temperature

26. What is considered normal operating conditions?
Dehydrated with caps on each end
Yes
8
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

27. What is the typical pressure differance across a TXV?
100 psig
The takeoff fitting
100
Pi x radius squared

28. How will too much refrigerant effect subcooling?
It will be high
Infiltration and ventilation
Latent and sensible
Slugging

29. How are round ducts supported?

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30. Can refrigerant line sets be altered in length?
Infiltration and ventilation
A piston type metering device
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

31. What are the components of a hard-start kit?
Indoor fan motor - outdoor fan motor - and the compressor
18 gauge
Potential relay and start capacitor
6

32. The fan switch closes at what temperature?
15% silphos
A dirty evaporator
140 degrees F
Duct - electrical - and mechanical

33. How do you calculate cfm?

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34. A reciprocating compressor has what sort of moving parts?
With 4' saddles
Pistons
100
Inches of water column (in. WC)

35. How many cfm per ton?
400
Static pressure - velocity pressure - and total pressure
30-35 degrees above ambient
TXV

36. The fan switch closes at what temperature?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
140 degrees F
Staples and tape
With an are rating

37. How do you achieve high-efficiency?
A swaging tool
Standard
A piston type metering device
By increasing the surface of the condenser coil

38. The compressor is cooled by liquid refrigerant. (True of False)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
False
45-55%
Pull a vacuum

39. What are the components of a hard-start kit?
In series
With an are rating
Potential relay and start capacitor
It will be high

40. What is lined duct?
40 A
Duct with insulation on the inside
With 4' saddles
Infiltration and ventilation

41. In what state is the refrigerant in the compressor?
Over/under and side by side
2 minutes
5 degrees
Vapor

42. 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
Heat loss
Any amount
30 degrees F

43. What are the two basic duct connection configurations for package units supply and return air ducts?
4
A band 4 inches or more in width
TXV
Over/under and side by side

44. How does ACR copper pipe come?
ACR (air-conditioning refrigeration) tubing
Pistons
Over 800 degrees F
Dehydrated with caps on each end

45. When do you install an auxillary drain pan?
When it is above a conditioned space
It will have a decrease in superheat
Static pressure - velocity pressure - and total pressure
Static pressure - velocity pressure - and total pressure

46. Which type of wire can handle a higher ampacity?
Stranded
True
When it is a pull-through evaporator
8-12 degrees F

47. Where do you install a trap on a drain line?
2 minutes
In parallel
In parallel
Before the vent

48. What is the normal evaporator temperature?
40 degrees F
Blended refrigerants
It will be low
45 degrees F

49. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
30-35 degrees above ambient
40 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
Standard

50. How will too much refrigerant effect superheat?
Fiberglass
It will be high
150
It will be low