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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. What are the two types of package units?
It will be low
Boil the liquid refrigerant out ot the oil within the crankcase
A dirty evaporator
Side-by-side and over-and-under

2. The evaporator is designed to remove what two types of heat?
Yes
Latent and sensible
Below 800 degrees F
Duct - electrical - and mechanical

3. At what temperature does refrigerant condense in a high-efficiency unit?
2
It also rises
Btu/hr (output) / wattage (input)
20 degrees above ambient

4. What is the range for normal superheat and subcooling?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
8-12 degrees F
Yes
TXV

5. At what temperature will brazing melt?
RLA/FLA x 5
Over 800 degrees F
15 A
It will be high

6. How many amps can 12 g wire handle?
20 A
Yes
Indoor fan motor - outdoor fan motor - and the compressor
Yes

7. What is lined duct?
Duct with insulation on the inside
They are physically larger
1/4'
Yes

8. Where do you install a trap on a drain line?
Positive
Before the vent
40 degrees F
Heat load

9. Does a package unit come from the factory pre-charged?
Dehydrated with caps on each end
Yes
A band 4 inches or more in width
With a minimum of three evenly spaced self-tapping screws

10. How are round ducts connected to one another?
False
40 A
With a minimum of three evenly spaced self-tapping screws
105 degrees F

11. Most duct insulation is made of what?
With an are rating
A diffuser
Fiberglass
400

12. What is the typical pressure differance across a TXV?
Heat load
Nominal-sized tubing
100 psig
15% silphos

13. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
Belt drive and direct drive
15% silphos
Stranded

14. Where is insulation used on copper tubing used for air-conditioning?
400
The suction line or the low-pressure side
Pistons
30 degrees F

15. When do you install a trap on a drain line?
When it is a pull-through evaporator
Over 800 degrees F
105 degrees F
20 A

16. Pressure in ductwork is measured In what?
400
Inches of water column (in. WC)
Any amount
Boil the liquid refrigerant out ot the oil within the crankcase

17. 13 SEER is classified as what kind of efficiency?
Yes
Inclined manometer
High
They are larger

18. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
ACR (air-conditioning refrigeration) tubing
1/4'
40 A

19. Which type of wire can handle a higher ampacity?
25-ft or 50-ft
RLA/FLA x 5
A band 4 inches or more in width
Stranded

20. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Common
A swaging tool
A bypass duct or a dump zone

21. What do you use to connect square and rectangular ductboard together?
8
Indoor fan motor - outdoor fan motor - and the compressor
S-clips and drives (cleats)
Latent and sensible

22. Where do you apply flux when soldering?
1/4'
40 degrees F
400
Outside of the male fitting

23. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Duct with insulation on the inside
Shorted winding - open winding - and grounded winding
L-type

24. When do you install an auxillary drain pan?
Vapor
5 degrees
20 A
When it is above a conditioned space

25. What gauge is thermostat wire?
18 gauge
Side-by-side and over-and-under
False
15% silphos

26. How do you calculate the area of a circle?
The takeoff fitting
To lower the amount of pressure drop through the coil
400
Pi x radius squared

27. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Latent and sensible
In series
They are larger
15% silphos

28. At what temperature will soft solder melt?
Below 800 degrees F
45-55%
A swaging tool
100 psig

29. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Nominal-sized tubing
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Any amount
The takeoff fitting

30. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
L-type
Subtract ambient temperature from 100
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

31. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Subtract ambient temperature from 100
Indoor fan motor - outdoor fan motor - and the compressor
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

32. Which is more efficient - a TXV or a fixed-orifice metering device?
It will be high
TXV
Fiberglass
Belt drive and direct drive

33. 7' round duct has a ballpark cfm of what?
Slugging
Inclined manometer
150
Individual return air systems and central return air systems

34. How is the high pressure switch wired with the low pressure switch?
In parallel
1/4'
In series
Nominal-sized tubing

35. What is it called when liquid refrigerant gets into the compressor?
Slugging
It also rises
Potential relay and start capacitor
Outside diameter (OD)

36. How do you calculate cfm?

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37. The fan switch opens at what temperature?
Over 800 degrees F
105 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
4

38. What type of air conditioning system must be charged using the superheat method?
Standard
Duct with insulation on the inside
Individual return air systems and central return air systems
A piston type metering device

39. When do you install a trap on a drain line?
Fiberglass
When it is a pull-through evaporator
Potential relay and start capacitor
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

40. What distributes supply air to a room in a structure?
RLA/FLA x 5
Common
A diffuser
400

41. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Standard
Individual return air systems and central return air systems
6
They are physically larger

42. How many BTU's per ton?
12000
Over/under and side by side
Suction
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

43. What is considered normal operating conditions?
It will have a decrease in superheat
40 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Staples and tape

44. What is lined duct?
It will be low
Duct with insulation on the inside
High
400

45. What type of air conditioning system must be charged using the superheat method?
150
Outside of the male fitting
A piston type metering device
20 degrees F

46. Sections of duct board can be fastened together with what?
Indoor fan motor - outdoor fan motor - and the compressor
Stranded
Staples and tape
In series

47. How many amps can 8 g wire handle?
40 A
Stranded
40 degrees F
A bypass duct or a dump zone

48. The crankcase heater on an air-conditioning compressor is used to what?
SEER includes the energy used in the start-up and shut-down cycles
It will be high
Boil the liquid refrigerant out ot the oil within the crankcase
40 A

49. 9' round duct has a ballpark cfm of what?
20 A
300
Pi x radius squared
Stranded

50. Where do you apply flux when soldering?
Outside of the male fitting
Inclined manometer
2
8-12 degrees F