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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. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
True
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

2. What are the two ways that fresh air enters a structure?
TXV
18 gauge
140 degrees F
Infiltration and ventilation

3. The load on the evaporater will effect which pressure?
It will be high
Suction
Below 800 degrees F
Nitrogen with a small amount of refrigerant

4. How are the condenser coils different on a high-efficiency unit?
L-type
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
150
They are larger

5. What are the components of a hard-start kit?
Indoor fan motor - outdoor fan motor - and the compressor
Over/under and side by side
Potential relay and start capacitor
Duct - electrical - and mechanical

6. How are round ducts supported?

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7. Where is insulation used on copper tubing used for air-conditioning?
300
Positive
Yes
The suction line or the low-pressure side

8. Where do you check the amps on a motor?
8-12 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Heat loss
On the common terminal

9. In what state is the refrigerant in the compressor?
300
Vapor
TXV
Side-by-side and over-and-under

10. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
200
5 degrees
30-35 degrees above ambient

11. What sort of pressure will a push-through evaporator have?
Over 800 degrees F
8
Positive
Nitrogen with a small amount of refrigerant

12. The fan switch opens at what temperature?
L-type
Individual return air systems and central return air systems
105 degrees F
S-clips and drives (cleats)

13. Do you need a trap on a pull-through evaporator?
Rise
105 degrees F
40 degrees F
Yes

14. How do you calculate EER?
Btu/hr (output) / wattage (input)
40 degrees F
It will be high
30 A

15. What sort of pressure will a push-through evaporator have?
In parallel
300
Duct - electrical - and mechanical
Positive

16. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
1/4'
400
On the common terminal

17. What percentage silver do you need to use for an are-410 system?
In parallel
Individual return air systems and central return air systems
Rise
15% silphos

18. The compressor is cooled by liquid refrigerant. (True of False)
2
False
Dehydrated with caps on each end
By increasing the surface of the condenser coil

19. How long should you leave a system off once you kill power before restarting it?
2 minutes
Yes
Heat loss
2

20. Superheat should never be below how many degrees
ACR (air-conditioning refrigeration) tubing
L-type
15% silphos
5 degrees

21. What are the three crafts normally associated with an air-conditioned installation?
Slugging
1/4'
5 degrees
Duct - electrical - and mechanical

22. If the rpm's are 1750 - how many poles does the motor have?
To lower the amount of pressure drop through the coil
It will have a decrease in superheat
4
Stranded

23. Does a package unit come from the factory pre-charged?
Yes
20 degrees above ambient
Inches of water column (in. WC)
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

24. The evaporator is designed to remove what two types of heat?
It will have a decrease in superheat
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
S-clips and drives (cleats)
Latent and sensible

25. A reciprocating compressor has what sort of moving parts?
Pistons
400
40 degrees F
Standard

26. How do you calculate ballpark superheat?
Boil the liquid refrigerant out ot the oil within the crankcase
8
Subtract ambient temperature from 100
Over 800 degrees F

27. What is the range for normal superheat and subcooling?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Boil the liquid refrigerant out ot the oil within the crankcase
SEER includes the energy used in the start-up and shut-down cycles
8-12 degrees F

28. What tool is used to expand the diameter of soft copper tubing
5 degrees
A swaging tool
45-55%
30-35 degrees above ambient

29. 13 SEER is classified as what kind of efficiency?
High
400
150
Nominal-sized tubing

30. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Outside of the male fitting
45-55%
Fiberglass
Any amount

31. Can refrigerant line sets be altered in length?
Shorted winding - open winding - and grounded winding
12000
Yes
Blended refrigerants

32. The fan switch closes at what temperature?
A diffuser
Belt drive and direct drive
Heat load
140 degrees F

33. Do you need a vent on a pull-through evaporator?
30 A
6
Nominal-sized tubing
Yes

34. What is used to measure static air pressure in ducts.
Inclined manometer
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Over 800 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

35. How do you calculate EER?
They are larger
100 psig
Btu/hr (output) / wattage (input)
100

36. What is the design boiling point for most evaporator coils in residential air conditioning?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
40 degrees F
30 A
Nitrogen with a small amount of refrigerant

37. What percentage silver do you need to use for an are-410 system?
In series
200
15% silphos
20 degrees above ambient

38. If the rpm's are 1750 - how many poles does the motor have?
4
5 degrees
Vapor
By increasing the surface of the condenser coil

39. How do you calculate ballpark superheat?
40 degrees F
Subtract ambient temperature from 100
On the common terminal
Side-by-side and over-and-under

40. 6' round duct has a ballpark cfm of what?
Yes
No
40 degrees F
100

41. How many cfm per ton?
It also rises
Nitrogen with a small amount of refrigerant
400
Pi x radius squared

42. 7' round duct has a ballpark cfm of what?
Latent and sensible
40 A
150
To remove humidity and lower dry bulb temperature

43. How many amps can 12 g wire handle?
Vapor
20 A
TXV
Fiberglass

44. How many BTU's per ton?
30 A
With an are rating
15 A
12000

45. 7' round duct has a ballpark cfm of what?
It will be high
The takeoff fitting
45 degrees F
150

46. Sections of duct board can be fastened together with what?
400
Belt drive and direct drive
Rise
Staples and tape

47. What do you use to connect square and rectangular ductboard together?
Pi x radius squared
Suction
S-clips and drives (cleats)
It rises

48. What are the four materials used to make duct?
A piston type metering device
TXV
Pistons
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

49. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
18 gauge
A bypass duct or a dump zone
When the system is under pressure

50. What are the two basic duct connection configurations for package units supply and return air ducts?
Heat loss
In series
Over/under and side by side
2