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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. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
It will be low
True
High
To remove humidity and lower dry bulb temperature

2. What type of air conditioning system must be charged using the superheat method?
8-12 degrees F
They are larger
Over/under and side by side
A piston type metering device

3. Most duct insulation is made of what?
40 degrees F
On the common terminal
A bypass duct or a dump zone
Fiberglass

4. In what state is the refrigerant in the compressor?
300
Positive
Pistons
Vapor

5. The load on the evaporater will effect which pressure?
Suction
2
6
On the common terminal

6. Where do you check the amps on a motor?
On the common terminal
Potential relay and start capacitor
8
S-clips and drives (cleats)

7. On what terminal do you check amperage?
A swaging tool
Common
Inches of water column (in. WC)
Inclined manometer

8. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
When it is a pull-through evaporator
18 gauge
S-clips and drives (cleats)

9. What sort of pressure will a pull-through evaporator have?
4
To lower the amount of pressure drop through the coil
1/4'
Negative

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

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11. What are the four materials used to make duct?
Compressor
When the system is under pressure
Heat load
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

12. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Pull a vacuum
45-55%
40 degrees F
Yes

13. Which type of wire can handle a higher ampacity?
20 A
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Stranded
Inclined manometer

14. Superheat should never be below how many degrees
Standard
Pi x radius squared
ACR (air-conditioning refrigeration) tubing
5 degrees

15. At what temperature does refrigerant condense in a standard-efficiency unit?
Subtract ambient temperature from 100
A piston type metering device
30-35 degrees above ambient
S-clips and drives (cleats)

16. At what temperature will soft solder melt?
Below 800 degrees F
When it is above a conditioned space
4
It will be high

17. How are round ducts supported?

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18. What sort of pressure will a push-through evaporator have?
No
Positive
Suction
400

19. How do you achieve high-efficiency?
140 degrees F
By increasing the surface of the condenser coil
Outside of the male fitting
2 minutes

20. Pressure in ductwork is measured In what?
TXV
Inches of water column (in. WC)
18 gauge
300

21. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
Inside diameter (ID)
Dehydrated with caps on each end
A bypass duct or a dump zone

22. How many amps can 10 g wire handle?
They are physically larger
In parallel
ACR (air-conditioning refrigeration) tubing
30 A

23. How is nominal-sized tubing sized?
2 minutes
Subtract ambient temperature from 100
Inside diameter (ID)
12000

24. How many amps can 10 g wire handle?
30 A
The suction line or the low-pressure side
Stranded
Latent and sensible

25. Can refrigerant line sets be altered in length?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
With a minimum of three evenly spaced self-tapping screws
Yes
Before the vent

26. What do you use to check for leaks?
A diffuser
5 degrees
Nitrogen with a small amount of refrigerant
105 degrees F

27. Why are some ACR tubing lines insulated?
200
Slugging
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
2 minutes

28. How will too much refrigerant effect superheat?
6
It will be low
When the system is under pressure
30-35 degrees above ambient

29. What is the range for normal superheat and subcooling?
8-12 degrees F
They are physically larger
4
It rises

30. What are the two functions of the air-conditioning system?
RLA/FLA x 5
To remove humidity and lower dry bulb temperature
When it is above a conditioned space
High

31. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
Yes
Slugging
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

32. If the rpm's are 3450 - how many poles does the motor have?
Rise
When it is above a conditioned space
2
Latent and sensible

33. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Average feet per minute X area in square feet (H' x W'/144)
Before the vent
Nominal-sized tubing
ACR (air-conditioning refrigeration) tubing

34. 7' round duct has a ballpark cfm of what?
Outside of the male fitting
40 A
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
150

35. How many amps can 12 g wire handle?
Any amount
Inside diameter (ID)
Below 800 degrees F
20 A

36. What kind of refrigeratnts must be added in liquid form?
TXV
Stranded
Blended refrigerants
Inches of water column (in. WC)

37. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Over 800 degrees F
6
To lower the amount of pressure drop through the coil
Inside diameter (ID)

38. How does ACR copper pipe come?
They are physically larger
Indoor fan motor - outdoor fan motor - and the compressor
To lower the amount of pressure drop through the coil
Dehydrated with caps on each end

39. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
12000
40 degrees F
By increasing the surface of the condenser coil
A diffuser

40. The crankcase heater on an air-conditioning compressor is used to what?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
100
Before the vent
Boil the liquid refrigerant out ot the oil within the crankcase

41. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
400
SEER includes the energy used in the start-up and shut-down cycles
6

42. What do you do after you braze a system?
TXV
A bypass duct or a dump zone
Pull a vacuum
6

43. How do you calculate the area of a circle?
1/4'
Pi x radius squared
When it is above a conditioned space
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

44. Where do you install a trap on a drain line?
Nominal-sized tubing
Positive
Before the vent
To remove humidity and lower dry bulb temperature

45. How are the condenser coils different on a high-efficiency unit?
They are larger
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
TXV
Negative

46. How is ACR tubing sized?
A diffuser
Outside diameter (OD)
12000
30-35 degrees above ambient

47. How many cfm per ton?
12000
400
140 degrees F
Infiltration and ventilation

48. How is insulation around a duct rated?
Inclined manometer
15% silphos
A bypass duct or a dump zone
With an are rating

49. The A/C size is calculated by what?
It will be low
Heat load
In parallel
The suction line or the low-pressure side

50. In what length rolls is soft copper tubing normally available?
In series
Outside of the male fitting
25-ft or 50-ft
TXV