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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. How many amps can 10 g wire handle?
25-ft or 50-ft
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
30 A
Belt drive and direct drive

2. Do you need a trap on a pull-through evaporator?
Nominal-sized tubing
False
8-12 degrees F
Yes

3. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
ACR (air-conditioning refrigeration) tubing
Staples and tape
20 degrees F

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

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5. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
Positive
Outside of the male fitting
Stranded

6. What are the two functions of the air-conditioning system?
The suction line or the low-pressure side
To remove humidity and lower dry bulb temperature
L-type
Boil the liquid refrigerant out ot the oil within the crankcase

7. Does a package unit come from the factory pre-charged?
4
Yes
Over/under and side by side
45 degrees F

8. 10' round duct has a ballpark cfm of what?
2
Before the vent
TXV
400

9. 6' round duct has a ballpark cfm of what?
By increasing the surface of the condenser coil
Individual return air systems and central return air systems
No
100

10. If the rpm's are 1750 - how many poles does the motor have?
2 minutes
SEER includes the energy used in the start-up and shut-down cycles
ACR (air-conditioning refrigeration) tubing
4

11. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
6
40 A
150

12. What sort of pressure will a push-through evaporator have?
Positive
No
Slugging
S-clips and drives (cleats)

13. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Staples and tape
The takeoff fitting
100 psig
They are physically larger

14. How do you calculate LRA?
On the common terminal
RLA/FLA x 5
40 degrees F
The takeoff fitting

15. What are the three pressures created by moving air in ductwork?
ACR (air-conditioning refrigeration) tubing
On the common terminal
Static pressure - velocity pressure - and total pressure
15% silphos

16. The fan switch closes at what temperature?
140 degrees F
The takeoff fitting
A dirty evaporator
Stranded

17. What type of air conditioning system must be charged using the superheat method?
It also rises
Fiberglass
8
A piston type metering device

18. What is a package unit?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
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.
Blended refrigerants

19. What are the four materials used to make duct?
Indoor fan motor - outdoor fan motor - and the compressor
Belt drive and direct drive
On the common terminal
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

20. What percentage silver do you need to use for an are-410 system?
Heat loss
15% silphos
15 A
Over/under and side by side

21. What are the two types of return air systems in residential installations?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Individual return air systems and central return air systems
400
With an are rating

22. At what temperature will soft solder melt?
1/4'
Below 800 degrees F
Average feet per minute X area in square feet (H' x W'/144)
Duct with insulation on the inside

23. What is the design boiling point for most evaporator coils in residential air conditioning?
By increasing the surface of the condenser coil
100 psig
40 degrees F
The suction line or the low-pressure side

24. If the rpm's are 750 - how many poles does the motor have?
Indoor fan motor - outdoor fan motor - and the compressor
8
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
The suction line or the low-pressure side

25. If the suction pressure rises - what happens to the head pressure?
It also rises
8
Yes
140 degrees F

26. A reciprocating compressor has what sort of moving parts?
Duct with insulation on the inside
Inches of water column (in. WC)
Pistons
S-clips and drives (cleats)

27. When do you install a trap on a drain line?
Heat load
When it is a pull-through evaporator
Indoor fan motor - outdoor fan motor - and the compressor
SEER includes the energy used in the start-up and shut-down cycles

28. How do you calculate cfm?

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29. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
40 degrees F
Yes
Standard

30. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
Outside of the male fitting
200
Yes

31. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
20 degrees F
Dehydrated with caps on each end
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
True

32. Where do you apply flux when soldering?
Individual return air systems and central return air systems
Vapor
5 degrees
Outside of the male fitting

33. Will a dirty condenser cause a rise or fall in pressure?
L-type
Stranded
Boil the liquid refrigerant out ot the oil within the crankcase
Rise

34. What is the range for normal superheat and subcooling?
Nitrogen with a small amount of refrigerant
Indoor fan motor - outdoor fan motor - and the compressor
Static pressure - velocity pressure - and total pressure
8-12 degrees F

35. The crankcase heater on an air-conditioning compressor is used to what?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Boil the liquid refrigerant out ot the oil within the crankcase
A band 4 inches or more in width
A piston type metering device

36. How is ACR tubing sized?
When the system is under pressure
Outside diameter (OD)
No
140 degrees F

37. The fan switch opens at what temperature?
The suction line or the low-pressure side
105 degrees F
140 degrees F
30 A

38. If the rpm's are 3450 - how many poles does the motor have?
2
Indoor fan motor - outdoor fan motor - and the compressor
20 degrees F
Potential relay and start capacitor

39. In what length rolls is soft copper tubing normally available?
Over/under and side by side
Suction
They are larger
25-ft or 50-ft

40. What kind of refrigeratnts must be added in liquid form?
Pull a vacuum
Blended refrigerants
45-55%
Rise

41. Most duct insulation is made of what?
Fiberglass
Boil the liquid refrigerant out ot the oil within the crankcase
SEER includes the energy used in the start-up and shut-down cycles
Stranded

42. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Dehydrated with caps on each end
Inches of water column (in. WC)
45-55%
40 degrees F

43. The furnace size is calculated by what?
A swaging tool
Heat loss
2 minutes
No

44. How do you calculate cfm?

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45. The A/C size is calculated by what?
Nominal-sized tubing
Heat load
A diffuser
Shorted winding - open winding - and grounded winding

46. On what terminal do you check amperage?
Common
Inches of water column (in. WC)
A band 4 inches or more in width
Subtract ambient temperature from 100

47. What gauge is thermostat wire?
15 A
18 gauge
True
Nitrogen with a small amount of refrigerant

48. How are the condenser coils different on a high-efficiency unit?
They are larger
12000
Yes
Common

49. Will a dirty condenser cause a rise or fall in pressure?
Rise
Inside diameter (ID)
100
8-12 degrees F

50. Superheat should never be below how many degrees
When it is above a conditioned space
Before the vent
5 degrees
200