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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. The fan switch closes at what temperature?
Dehydrated with caps on each end
They are larger
140 degrees F
Shorted winding - open winding - and grounded winding

2. How many amps can 10 g wire handle?
Any amount
30 A
Vapor
Slugging

3. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
By increasing the surface of the condenser coil
The suction line or the low-pressure side
A bypass duct or a dump zone
A piston type metering device

4. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
200
6
150

5. What is the range for normal superheat and subcooling?
30-35 degrees above ambient
Outside of the male fitting
Rise
8-12 degrees F

6. What are the two types of blower drives?
5 degrees
Belt drive and direct drive
Nitrogen with a small amount of refrigerant
Boil the liquid refrigerant out ot the oil within the crankcase

7. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
100 psig
40 degrees F
150
Yes

8. Where is insulation used on copper tubing used for air-conditioning?
SEER includes the energy used in the start-up and shut-down cycles
45 degrees F
Side-by-side and over-and-under
The suction line or the low-pressure side

9. The fan switch opens at what temperature?
45 degrees F
2 minutes
A diffuser
105 degrees F

10. How is the high pressure switch wired with the low pressure switch?
Over/under and side by side
In parallel
Individual return air systems and central return air systems
It rises

11. What is the difference between SEER and EER?
200
It rises
SEER includes the energy used in the start-up and shut-down cycles
Shorted winding - open winding - and grounded winding

12. What sort of pressure will a pull-through evaporator have?
Yes
To remove humidity and lower dry bulb temperature
Fiberglass
Negative

13. How will too much refrigerant effect subcooling?
20 degrees F
In parallel
It will be high
Fiberglass

14. How do you calculate cfm?

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15. What are the two types of return air systems in residential installations?
40 degrees F
8-12 degrees F
Individual return air systems and central return air systems
A swaging tool

16. If the rpm's are 3450 - how many poles does the motor have?
S-clips and drives (cleats)
Individual return air systems and central return air systems
Any amount
2

17. What percentage silver do you need to use for an are-410 system?
Suction
Over 800 degrees F
15% silphos
Suction

18. What is the typical pressure differance across a TXV?
Infiltration and ventilation
False
It rises
100 psig

19. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
They are physically larger
15% silphos
45-55%

20. How is ACR tubing sized?
With a minimum of three evenly spaced self-tapping screws
Duct - electrical - and mechanical
Outside diameter (OD)
15 A

21. What is lined duct?
Inside diameter (ID)
Outside diameter (OD)
It also rises
Duct with insulation on the inside

22. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
To remove humidity and lower dry bulb temperature
In series

23. 9' round duct has a ballpark cfm of what?
It will be low
Dehydrated with caps on each end
300
Average feet per minute X area in square feet (H' x W'/144)

24. What type of air conditioning system must be charged using the superheat method?
20 degrees above ambient
Fiberglass
S-clips and drives (cleats)
A piston type metering device

25. Sections of duct board can be fastened together with what?
False
High
300
Staples and tape

26. The furnace size is calculated by what?
Fiberglass
Over 800 degrees F
20 degrees above ambient
Heat loss

27. How is nominal-sized tubing sized?
Inside diameter (ID)
Dehydrated with caps on each end
400
Staples and tape

28. What kind of refrigeratnts must be added in liquid form?
105 degrees F
Blended refrigerants
A piston type metering device
100 psig

29. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
Below 800 degrees F
They are physically larger
A band 4 inches or more in width

30. The evaporator is designed to remove what two types of heat?
The suction line or the low-pressure side
Latent and sensible
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Heat loss

31. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
20 degrees F
With an are rating
105 degrees F

32. Can refrigerant line sets be altered in length?
Outside diameter (OD)
18 gauge
5 degrees
Yes

33. How is insulation around a duct rated?
Duct with insulation on the inside
Yes
With an are rating
They are physically larger

34. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
In series
To lower the amount of pressure drop through the coil
The suction line or the low-pressure side
40 degrees F

35. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Infiltration and ventilation
A bypass duct or a dump zone
400
Staples and tape

36. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
Yes
Positive
Individual return air systems and central return air systems

37. When do you install a trap on a drain line?
4
Slugging
When it is a pull-through evaporator
Positive

38. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Rise
40 degrees F
The suction line or the low-pressure side
They are physically larger

39. What is the normal evaporator temperature?
15% silphos
With an are rating
45 degrees F
In series

40. The load on the evaporater will effect which pressure?
Any amount
100
Suction
Inches of water column (in. WC)

41. How is flexible duct supported?
With an are rating
Infiltration and ventilation
A band 4 inches or more in width
400

42. If pressure rises - what happens to the superheat?
It rises
150
1/4'
Belt drive and direct drive

43. Superheat should never be below how many degrees
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
5 degrees
Positive
Slugging

44. Do you need a vent on a pull-through evaporator?
Yes
200
25-ft or 50-ft
In parallel

45. 7' round duct has a ballpark cfm of what?
8
1/4'
Over 800 degrees F
150

46. How many BTU's per ton?
30-35 degrees above ambient
When it is a pull-through evaporator
When it is above a conditioned space
12000

47. What is it called when liquid refrigerant gets into the compressor?
8
Pistons
Slugging
It will be low

48. When do you install an auxillary drain pan?
Pull a vacuum
Before the vent
When it is above a conditioned space
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

49. What is the difference between SEER and EER?
With 4' saddles
Yes
SEER includes the energy used in the start-up and shut-down cycles
Outside diameter (OD)

50. What are the two functions of the air-conditioning system?
45 degrees F
With a minimum of three evenly spaced self-tapping screws
Belt drive and direct drive
To remove humidity and lower dry bulb temperature