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Residential Air Conditioning

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. What sort of pressure will a pull-through evaporator have?
100 psig
Negative
It rises
A band 4 inches or more in width

2. In what state is the refrigerant in the compressor?
Vapor
A diffuser
Dehydrated with caps on each end
They are larger

3. At what temperature will brazing melt?
Suction
The takeoff fitting
Standard
Over 800 degrees F

4. How do you calculate the area of a circle?
Indoor fan motor - outdoor fan motor - and the compressor
It also rises
18 gauge
Pi x radius squared

5. Where do you install a trap on a drain line?
Before the vent
20 A
Common
45-55%

6. The A/C size is calculated by what?
Heat load
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
6
When it is above a conditioned space

7. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
140 degrees F
Inclined manometer
Slugging
A bypass duct or a dump zone

8. What is the range for normal superheat and subcooling?
Belt drive and direct drive
On the common terminal
8-12 degrees F
Compressor

9. What sort of pressure will a pull-through evaporator have?
Negative
Shorted winding - open winding - and grounded winding
Average feet per minute X area in square feet (H' x W'/144)
Pistons

10. What gauge is thermostat wire?
300
Subtract ambient temperature from 100
18 gauge
Side-by-side and over-and-under

11. Do you need a trap on a push-through evaporator?
ACR (air-conditioning refrigeration) tubing
No
Nitrogen with a small amount of refrigerant
100

12. What kind of copper tubing is used for plumbing and heating applications?
140 degrees F
200
When the system is under pressure
Nominal-sized tubing

13. How do you achieve high-efficiency?
Any amount
Pi x radius squared
Yes
By increasing the surface of the condenser coil

14. What are the three pressures created by moving air in ductwork?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
In series
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

15. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
18 gauge
The suction line or the low-pressure side
To lower the amount of pressure drop through the coil

16. How are the condenser coils different on a high-efficiency unit?
They are larger
ACR (air-conditioning refrigeration) tubing
15 A
2 minutes

17. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
A band 4 inches or more in width
Outside of the male fitting
Nominal-sized tubing

18. If the rpm's are 750 - how many poles does the motor have?
Over/under and side by side
8
Slugging
30 A

19. How do you calculate the area of a circle?
Pi x radius squared
It also rises
Over/under and side by side
400

20. What are the two types of blower drives?
High
40 A
Belt drive and direct drive
With 4' saddles

21. Where do you apply flux when soldering?
6
Common
Outside of the male fitting
TXV

22. Does a package unit come from the factory pre-charged?
Yes
TXV
Nominal-sized tubing
Heat loss

23. What is the design boiling point for most evaporator coils in residential air conditioning?
With a minimum of three evenly spaced self-tapping screws
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
40 degrees F
15 A

24. What kind of metering device do high-efficiency units usually use?
2 minutes
40 degrees F
Potential relay and start capacitor
TXV

25. The furnace size is calculated by what?
2
Heat loss
Duct - electrical - and mechanical
They are physically larger

26. How long should you leave a system off once you kill power before restarting it?
40 degrees F
1/4'
2 minutes
5 degrees

27. How are round ducts supported?

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28. Does a package unit come from the factory pre-charged?
Yes
Duct with insulation on the inside
Nitrogen with a small amount of refrigerant
40 degrees F

29. Can refrigerant line sets be altered in length?
A diffuser
18 gauge
Yes
105 degrees F

30. Will a dirty condenser cause a rise or fall in pressure?
Over/under and side by side
Rise
400
It rises

31. What are the three pressures created by moving air in ductwork?
When it is a pull-through evaporator
When it is a pull-through evaporator
Staples and tape
Static pressure - velocity pressure - and total pressure

32. Do you need a trap on a push-through evaporator?
40 A
1/4'
2
No

33. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
12000
Pistons
Pistons

34. What is lined duct?
With a minimum of three evenly spaced self-tapping screws
On the common terminal
Yes
Duct with insulation on the inside

35. What kind of copper tubing is used for refrigeration or air-conditioning applications?
No
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
ACR (air-conditioning refrigeration) tubing
Duct with insulation on the inside

36. What is a package unit?
Heat loss
When it is above a conditioned space
With 4' saddles
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

37. How is insulation around a duct rated?
Over 800 degrees F
The suction line or the low-pressure side
Nitrogen with a small amount of refrigerant
With an are rating

38. What can cause a decrease in suction pressure on an air-conditioning system?
TXV
A dirty evaporator
Static pressure - velocity pressure - and total pressure
Slugging

39. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Inclined manometer
Indoor fan motor - outdoor fan motor - and the compressor
Compressor

40. 10' round duct has a ballpark cfm of what?
Heat load
Blended refrigerants
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
400

41. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
Pi x radius squared
Outside diameter (OD)
Over/under and side by side

42. If the rpm's are 1750 - how many poles does the motor have?
45-55%
It will have a decrease in superheat
4
200

43. 6' round duct has a ballpark cfm of what?
2 minutes
30 degrees F
100
Standard

44. The fan switch opens at what temperature?
20 A
A swaging tool
105 degrees F
Over 800 degrees F

45. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
A piston type metering device
Fiberglass
Before the vent

46. A reciprocating compressor has what sort of moving parts?
Nitrogen with a small amount of refrigerant
Pistons
In series
400

47. At what temperature will brazing melt?
8-12 degrees F
Over 800 degrees F
8
105 degrees F

48. How is the high pressure switch wired with the low pressure switch?
Individual return air systems and central return air systems
8
They are larger
In parallel

49. Where do you apply flux when soldering?
In series
Outside of the male fitting
Standard
45-55%

50. If the rpm's are 1050 - how many poles does the motor have?
30 degrees F
Heat load
6
Individual return air systems and central return air systems

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Residential Air Conditioning

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