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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 is considered normal operating conditions?
Inches of water column (in. WC)
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pistons

2. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Any amount
With an are rating
45-55%
It also rises

3. Pressure in ductwork is measured In what?
Latent and sensible
When the system is under pressure
Inches of water column (in. WC)
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

4. Why are some ACR tubing lines insulated?
To lower the amount of pressure drop through the coil
Stranded
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
4

5. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
It will be low
A diffuser
SEER includes the energy used in the start-up and shut-down cycles

6. What gauge is thermostat wire?
18 gauge
Duct - electrical - and mechanical
Any amount
150

7. How many cfm per ton?
To lower the amount of pressure drop through the coil
Infiltration and ventilation
400
150

8. How is nominal-sized tubing sized?
Inside diameter (ID)
Yes
140 degrees F
Over 800 degrees F

9. How many amps can 8 g wire handle?
40 A
2 minutes
Yes
1/4'

10. What is lined duct?
Duct with insulation on the inside
A band 4 inches or more in width
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
When it is a pull-through evaporator

11. How many amps can 10 g wire handle?
Potential relay and start capacitor
15% silphos
Vapor
30 A

12. Where do you check the amps on a motor?
In series
They are larger
On the common terminal
20 degrees F

13. What are the two types of package units?
A band 4 inches or more in width
40 A
Side-by-side and over-and-under
45 degrees F

14. What is the design boiling point for most evaporator coils in residential air conditioning?
Subtract ambient temperature from 100
40 degrees F
It will be low
It will be high

15. What are the two types of return air systems in residential installations?
30-35 degrees above ambient
Individual return air systems and central return air systems
5 degrees
30 A

16. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
45 degrees F
The takeoff fitting
140 degrees F
40 degrees F

17. What are the four materials used to make duct?
1/4'
2
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
20 degrees F

18. On what terminal do you check amperage?
Common
6
Pi x radius squared
15% silphos

19. Superheat should never be below how many degrees
True
5 degrees
Dehydrated with caps on each end
Rise

20. 6' round duct has a ballpark cfm of what?
Duct - electrical - and mechanical
It rises
100
By increasing the surface of the condenser coil

21. What are the components of a hard-start kit?
TXV
Compressor
Potential relay and start capacitor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

22. What is the typical pressure differance across a TXV?
100 psig
Heat load
They are larger
Duct - electrical - and mechanical

23. Do you need a trap on a pull-through evaporator?
Nitrogen with a small amount of refrigerant
Inches of water column (in. WC)
Inside diameter (ID)
Yes

24. How many amps can 10 g wire handle?
To remove humidity and lower dry bulb temperature
A diffuser
30 A
Pull a vacuum

25. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
To remove humidity and lower dry bulb temperature
A bypass duct or a dump zone
20 degrees F
With an are rating

26. What are the two types of blower drives?
Belt drive and direct drive
40 degrees F
Outside diameter (OD)
It rises

27. What distributes supply air to a room in a structure?
Duct with insulation on the inside
A diffuser
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes

28. What is lined duct?
400
The takeoff fitting
S-clips and drives (cleats)
Duct with insulation on the inside

29. When do you install a trap on a drain line?
Heat loss
20 degrees above ambient
When it is a pull-through evaporator
Blended refrigerants

30. What do you use to check for leaks?
Inclined manometer
Nitrogen with a small amount of refrigerant
They are larger
When it is a pull-through evaporator

31. How many BTU's per ton?
A diffuser
100
45 degrees F
12000

32. Can refrigerant line sets be altered in length?
Yes
Duct with insulation on the inside
30-35 degrees above ambient
Slugging

33. The load on the evaporater will effect which pressure?
Yes
Suction
Yes
A band 4 inches or more in width

34. What are the components of a hard-start kit?
Over 800 degrees F
Individual return air systems and central return air systems
When the system is under pressure
Potential relay and start capacitor

35. What type of air conditioning system must be charged using the superheat method?
When the system is under pressure
With 4' saddles
A piston type metering device
100 psig

36. What is the typical pressure differance across a TXV?
A band 4 inches or more in width
Suction
100 psig
Negative

37. What is the name of the fitting where the branch line leaves the duct?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
The takeoff fitting
Duct with insulation on the inside

38. What do you do after you braze a system?
Suction
Pull a vacuum
With an are rating
Common

39. Most duct insulation is made of what?
They are physically larger
With an are rating
A piston type metering device
Fiberglass

40. What percentage silver do you need to use for an are-410 system?
Before the vent
Yes
They are physically larger
15% silphos

41. If the rpm's are 1050 - how many poles does the motor have?
In parallel
Standard
6
High

42. The evaporator is designed to remove what two types of heat?
1/4'
They are larger
By increasing the surface of the condenser coil
Latent and sensible

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

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44. When do you install an auxillary drain pan?
Negative
40 degrees F
400
When it is above a conditioned space

45. Sections of duct board can be fastened together with what?
Btu/hr (output) / wattage (input)
Pistons
TXV
Staples and tape

46. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Rise
L-type
Below 800 degrees F
Vapor

47. The fan switch opens at what temperature?
105 degrees F
High
TXV
With a minimum of three evenly spaced self-tapping screws

48. How are round ducts supported?

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49. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
Static pressure - velocity pressure - and total pressure
A bypass duct or a dump zone
A swaging tool

50. What sort of pressure will a pull-through evaporator have?
40 degrees F
TXV
Negative
300