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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 many amps can 12 g wire handle?
A dirty evaporator
20 A
Fiberglass
It will be high

2. What is the normal evaporator temperature?
ACR (air-conditioning refrigeration) tubing
It rises
Shorted winding - open winding - and grounded winding
45 degrees F

3. What are the two basic duct connection configurations for package units supply and return air ducts?
30 A
To remove humidity and lower dry bulb temperature
SEER includes the energy used in the start-up and shut-down cycles
Over/under and side by side

4. Will a dirty condenser cause a rise or fall in pressure?
Common
Rise
5 degrees
Fiberglass

5. The fan switch opens at what temperature?
To remove humidity and lower dry bulb temperature
105 degrees F
They are physically larger
Duct - electrical - and mechanical

6. How do you calculate LRA?
RLA/FLA x 5
Over 800 degrees F
Nitrogen with a small amount of refrigerant
5 degrees

7. What component changes refrigerant from a low pressure gas to a high pressure gas?
Dehydrated with caps on each end
Compressor
Subtract ambient temperature from 100
A bypass duct or a dump zone

8. What are the three major power-consuming devices on an air-conditioning system?
Heat loss
40 A
TXV
Indoor fan motor - outdoor fan motor - and the compressor

9. How are round ducts connected to one another?
With an are rating
ACR (air-conditioning refrigeration) tubing
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws

10. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
8
20 degrees above ambient
Pi x radius squared
It will have a decrease in superheat

11. 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
Subtract ambient temperature from 100
Vapor
8-12 degrees F

12. What gauge is thermostat wire?
18 gauge
400
In series
Pistons

13. At what temperature will brazing melt?
Yes
Over 800 degrees F
Outside diameter (OD)
Slugging

14. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Potential relay and start capacitor
In series
20 degrees above ambient
Individual return air systems and central return air systems

15. How is insulation around a duct rated?
Rise
With an are rating
18 gauge
Rise

16. On what terminal do you check amperage?
Common
Btu/hr (output) / wattage (input)
It also rises
TXV

17. What is the typical pressure differance across a TXV?
Common
When it is above a conditioned space
A bypass duct or a dump zone
100 psig

18. How many amps can 8 g wire handle?
Yes
45 degrees F
40 A
TXV

19. Can refrigerant line sets be altered in length?
Yes
Yes
Dehydrated with caps on each end
400

20. How long should you leave a system off once you kill power before restarting it?
Inside diameter (ID)
2 minutes
8
ACR (air-conditioning refrigeration) tubing

21. How do you calculate EER?
400
Btu/hr (output) / wattage (input)
ACR (air-conditioning refrigeration) tubing
15 A

22. A reciprocating compressor has what sort of moving parts?
Pistons
A diffuser
To remove humidity and lower dry bulb temperature
Yes

23. 6' round duct has a ballpark cfm of what?
Heat load
20 degrees above ambient
100
SEER includes the energy used in the start-up and shut-down cycles

24. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
1/4'
Any amount
Yes
Yes

25. What is a package unit?
105 degrees F
It will be high
Btu/hr (output) / wattage (input)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

26. What are the three major power-consuming devices on an air-conditioning system?
Positive
Indoor fan motor - outdoor fan motor - and the compressor
A swaging tool
Negative

27. The furnace size is calculated by what?
It will be high
SEER includes the energy used in the start-up and shut-down cycles
SEER includes the energy used in the start-up and shut-down cycles
Heat loss

28. When do you install a trap on a drain line?
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
When it is a pull-through evaporator
8

29. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
100 psig
TXV
To lower the amount of pressure drop through the coil
Btu/hr (output) / wattage (input)

30. 10' round duct has a ballpark cfm of what?
Pull a vacuum
Potential relay and start capacitor
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
400

31. How is nominal-sized tubing sized?
Inside diameter (ID)
45 degrees F
15 A
Inches of water column (in. WC)

32. Where do you check the amps on a motor?
Compressor
On the common terminal
Over 800 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

33. What kind of copper tubing is used for refrigeration or air-conditioning applications?
30 A
S-clips and drives (cleats)
Nominal-sized tubing
ACR (air-conditioning refrigeration) tubing

34. How is ACR tubing sized?
Outside diameter (OD)
TXV
Suction
When it is a pull-through evaporator

35. What tool is used to expand the diameter of soft copper tubing
A swaging tool
Positive
Latent and sensible
On the common terminal

36. 7' round duct has a ballpark cfm of what?
By increasing the surface of the condenser coil
150
Boil the liquid refrigerant out ot the oil within the crankcase
15 A

37. What component changes refrigerant from a low pressure gas to a high pressure gas?
By increasing the surface of the condenser coil
A piston type metering device
20 degrees above ambient
Compressor

38. If the suction pressure rises - what happens to the head pressure?
A bypass duct or a dump zone
It also rises
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Indoor fan motor - outdoor fan motor - and the compressor

39. What is the typical pressure differance across a TXV?
Any amount
Average feet per minute X area in square feet (H' x W'/144)
100 psig
Dehydrated with caps on each end

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

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

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42. What are the two basic duct connection configurations for package units supply and return air ducts?
Belt drive and direct drive
Infiltration and ventilation
Positive
Over/under and side by side

43. Why are some ACR tubing lines insulated?
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
A diffuser
Positive

44. What sort of pressure will a push-through evaporator have?
12000
Fiberglass
105 degrees F
Positive

45. Do you need a trap on a pull-through evaporator?
Yes
Pi x radius squared
It will have a decrease in superheat
4

46. In what state is the refrigerant in the compressor?
Static pressure - velocity pressure - and total pressure
1/4'
Pistons
Vapor

47. What are the two types of return air systems in residential installations?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
12000
Blended refrigerants
Individual return air systems and central return air systems

48. How many amps can 12 g wire handle?
45 degrees F
Yes
20 A
Positive

49. What can cause a decrease in suction pressure on an air-conditioning system?
Duct - electrical - and mechanical
A dirty evaporator
5 degrees
It will have a decrease in superheat

50. What are the two types of return air systems in residential installations?
In parallel
By increasing the surface of the condenser coil
Individual return air systems and central return air systems
Standard