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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. If the rpm's are 1050 - how many poles does the motor have?
Nominal-sized tubing
6
Indoor fan motor - outdoor fan motor - and the compressor
200

2. 13 SEER is classified as what kind of efficiency?
High
Side-by-side and over-and-under
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

3. What do you use to check for leaks?
In parallel
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It will have a decrease in superheat
Nitrogen with a small amount of refrigerant

4. Where do you install a trap on a drain line?
Before the vent
Duct with insulation on the inside
15% silphos
Staples and tape

5. What type of air conditioning system must be charged using the superheat method?
40 degrees F
A piston type metering device
Boil the liquid refrigerant out ot the oil within the crankcase
Compressor

6. What percentage silver do you need to use for an are-410 system?
Compressor
Heat loss
8
15% silphos

7. What do you use to connect square and rectangular ductboard together?
No
Heat load
Yes
S-clips and drives (cleats)

8. The evaporator is designed to remove what two types of heat?
To remove humidity and lower dry bulb temperature
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Latent and sensible
By increasing the surface of the condenser coil

9. When do you install an auxillary drain pan?
When it is above a conditioned space
6
By increasing the surface of the condenser coil
On the common terminal

10. At what temperature does refrigerant condense in a standard-efficiency unit?
To lower the amount of pressure drop through the coil
30-35 degrees above ambient
In parallel
By increasing the surface of the condenser coil

11. How do you calculate cfm?

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12. Do you need a trap on a pull-through evaporator?
Blended refrigerants
Yes
The takeoff fitting
To lower the amount of pressure drop through the coil

13. How many amps can 12 g wire handle?
With an are rating
By increasing the surface of the condenser coil
20 A
Btu/hr (output) / wattage (input)

14. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
Inclined manometer
100
When the system is under pressure

15. What gauge is thermostat wire?
2 minutes
18 gauge
They are physically larger
Before the vent

16. How do you calculate ballpark superheat?
With 4' saddles
12000
It rises
Subtract ambient temperature from 100

17. What are the three pressures created by moving air in ductwork?
2 minutes
30 degrees F
Static pressure - velocity pressure - and total pressure
They are physically larger

18. The evaporator is designed to remove what two types of heat?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
With an are rating
Latent and sensible
Vapor

19. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Nitrogen with a small amount of refrigerant
Fiberglass
Heat load

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

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21. What is the name of the fitting where the branch line leaves the duct?
By increasing the surface of the condenser coil
Over 800 degrees F
The takeoff fitting
2 minutes

22. What are the two functions of the air-conditioning system?
Individual return air systems and central return air systems
To remove humidity and lower dry bulb temperature
Positive
8-12 degrees F

23. If the rpm's are 1750 - how many poles does the motor have?
The suction line or the low-pressure side
It rises
With a minimum of three evenly spaced self-tapping screws
4

24. Sections of duct board can be fastened together with what?
8-12 degrees F
It will be low
Heat loss
Staples and tape

25. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Btu/hr (output) / wattage (input)
With 4' saddles
L-type
It will have a decrease in superheat

26. What is a package unit?
Infiltration and ventilation
They are larger
No
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

27. Do you need a vent on a push-through evaporator?
Vapor
8-12 degrees F
Heat load
Yes

28. In what length rolls is soft copper tubing normally available?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
18 gauge
30 A
25-ft or 50-ft

29. What are the components of a hard-start kit?
100 psig
40 degrees F
Nitrogen with a small amount of refrigerant
Potential relay and start capacitor

30. What are the two types of blower drives?
ACR (air-conditioning refrigeration) tubing
To remove humidity and lower dry bulb temperature
Belt drive and direct drive
TXV

31. Most duct insulation is made of what?
Fiberglass
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Rise
Pull a vacuum

32. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pi x radius squared
8-12 degrees F

33. At what temperature does refrigerant condense in a standard-efficiency unit?
TXV
It will have a decrease in superheat
Shorted winding - open winding - and grounded winding
30-35 degrees above ambient

34. How do you calculate LRA?
RLA/FLA x 5
TXV
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Any amount

35. Where do you check the amps on a motor?
100 psig
The takeoff fitting
Shorted winding - open winding - and grounded winding
On the common terminal

36. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Yes
20 degrees F
Duct with insulation on the inside
2

37. On what terminal do you check amperage?
Common
5 degrees
High
S-clips and drives (cleats)

38. What is the normal evaporator temperature?
Stranded
Btu/hr (output) / wattage (input)
Yes
45 degrees F

39. How is the high pressure switch wired with the low pressure switch?
A dirty evaporator
SEER includes the energy used in the start-up and shut-down cycles
2 minutes
In parallel

40. What are the three major power-consuming devices on an air-conditioning system?
100 psig
A piston type metering device
Indoor fan motor - outdoor fan motor - and the compressor
Slugging

41. What are the four materials used to make duct?
Yes
Below 800 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Shorted winding - open winding - and grounded winding

42. What are the two types of return air systems in residential installations?
Inside diameter (ID)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
20 degrees above ambient
Individual return air systems and central return air systems

43. Where is insulation used on copper tubing used for air-conditioning?
Before the vent
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
5 degrees
The suction line or the low-pressure side

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

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45. Does a package unit come from the factory pre-charged?
Staples and tape
They are larger
Yes
Side-by-side and over-and-under

46. Which type of wire can handle a higher ampacity?
They are larger
The suction line or the low-pressure side
Stranded
To lower the amount of pressure drop through the coil

47. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Boil the liquid refrigerant out ot the oil within the crankcase
45-55%
30-35 degrees above ambient
12000

48. What sort of pressure will a pull-through evaporator have?
8-12 degrees F
Staples and tape
Negative
40 A

49. What are the three crafts normally associated with an air-conditioned installation?
5 degrees
Nominal-sized tubing
Duct - electrical - and mechanical
RLA/FLA x 5

50. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Shorted winding - open winding - and grounded winding
A bypass duct or a dump zone
High
400