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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?
30-35 degrees above ambient
6
The suction line or the low-pressure side
100 psig

2. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
It will have a decrease in superheat
45-55%
5 degrees

3. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
20 degrees F
With 4' saddles

4. What are the four materials used to make duct?
15% silphos
40 A
The takeoff fitting
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

5. How is the high pressure switch wired with the low pressure switch?
In parallel
Pull a vacuum
45 degrees F
150

6. What kind of copper tubing is used for plumbing and heating applications?
Boil the liquid refrigerant out ot the oil within the crankcase
105 degrees F
Nominal-sized tubing
Blended refrigerants

7. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
150
8-12 degrees F
Inclined manometer

8. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Rise
Over 800 degrees F
20 A
30 degrees F

9. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
In parallel
L-type
A piston type metering device
100 psig

10. What is used to measure static air pressure in ducts.
25-ft or 50-ft
Inclined manometer
200
15 A

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

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12. Do you need a vent on a pull-through evaporator?
Yes
Inside diameter (ID)
Individual return air systems and central return air systems
200

13. What is used to measure static air pressure in ducts.
To remove humidity and lower dry bulb temperature
Inclined manometer
Yes
Blended refrigerants

14. When do you install a trap on a drain line?
8-12 degrees F
ACR (air-conditioning refrigeration) tubing
When it is a pull-through evaporator
Vapor

15. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
4
Yes
40 A

16. The fan switch opens at what temperature?
False
105 degrees F
S-clips and drives (cleats)
False

17. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
8-12 degrees F
The suction line or the low-pressure side
It will have a decrease in superheat
1/4'

18. 8' round duct has a ballpark cfm of what?
Rise
200
40 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase

19. What is the name of the fitting where the branch line leaves the duct?
Yes
S-clips and drives (cleats)
The takeoff fitting
2 minutes

20. How will too much refrigerant effect superheat?
8-12 degrees F
8-12 degrees F
No
It will be low

21. What gauge is thermostat wire?
A bypass duct or a dump zone
18 gauge
Individual return air systems and central return air systems
Stranded

22. What are the three ways a motor can fail electrically?
Duct with insulation on the inside
It will be high
Shorted winding - open winding - and grounded winding
False

23. If pressure rises - what happens to the superheat?
RLA/FLA x 5
It rises
By increasing the surface of the condenser coil
Outside diameter (OD)

24. How many BTU's per ton?
Yes
12000
Stranded
Side-by-side and over-and-under

25. Does a package unit come from the factory pre-charged?
Yes
Inside diameter (ID)
A piston type metering device
Outside diameter (OD)

26. Sections of duct board can be fastened together with what?
Vapor
Common
Staples and tape
8

27. Do you need a vent on a push-through evaporator?
Yes
100
To lower the amount of pressure drop through the coil
Inside diameter (ID)

28. How do you achieve high-efficiency?
45 degrees F
Compressor
By increasing the surface of the condenser coil
Nitrogen with a small amount of refrigerant

29. What are the two types of blower drives?
With an are rating
Belt drive and direct drive
Yes
A dirty evaporator

30. 6' round duct has a ballpark cfm of what?
Belt drive and direct drive
40 degrees F
100
30 degrees F

31. How is the high pressure switch wired with the low pressure switch?
Rise
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
In parallel
400

32. How are round ducts supported?

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33. 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
Compressor
6
High

34. The furnace size is calculated by what?
Heat loss
25-ft or 50-ft
It rises
The takeoff fitting

35. If the rpm's are 1050 - how many poles does the motor have?
6
2 minutes
Positive
40 degrees F

36. 10' round duct has a ballpark cfm of what?
S-clips and drives (cleats)
6
400
45 degrees F

37. What do you do after you braze a system?
ACR (air-conditioning refrigeration) tubing
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pull a vacuum
40 degrees F

38. How many amps can 8 g wire handle?
40 A
1/4'
Blended refrigerants
Stranded

39. The fan switch opens at what temperature?
No
Over 800 degrees F
105 degrees F
400

40. How do you calculate the area of a circle?
L-type
False
45-55%
Pi x radius squared

41. What is it called when liquid refrigerant gets into the compressor?
Slugging
Btu/hr (output) / wattage (input)
Outside of the male fitting
It will be high

42. What are the components of a hard-start kit?
Compressor
Potential relay and start capacitor
105 degrees F
Pull a vacuum

43. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Outside diameter (OD)
In series
Over/under and side by side
Staples and tape

44. How many cfm per ton?
100
Over/under and side by side
30 degrees F
400

45. A reciprocating compressor has what sort of moving parts?
Pistons
With an are rating
Nominal-sized tubing
When it is above a conditioned space

46. How many amps can 12 g wire handle?
25-ft or 50-ft
20 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
100 psig

47. What are the two types of blower drives?
RLA/FLA x 5
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Belt drive and direct drive
A dirty evaporator

48. Pressure in ductwork is measured In what?
Over 800 degrees F
With 4' saddles
Inches of water column (in. WC)
With a minimum of three evenly spaced self-tapping screws

49. When do you install an auxillary drain pan?
1/4'
A swaging tool
Heat load
When it is above a conditioned space

50. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
20 A
To lower the amount of pressure drop through the coil
400
TXV