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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. 6' round duct has a ballpark cfm of what?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
False
100
Outside of the male fitting

2. The fan switch opens at what temperature?
Heat load
ACR (air-conditioning refrigeration) tubing
TXV
105 degrees F

3. 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
Side-by-side and over-and-under
5 degrees
15% silphos

4. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
15% silphos
1/4'
45 degrees F

5. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
With 4' saddles
False
The suction line or the low-pressure side

6. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Yes
In series
140 degrees F
Heat loss

7. What is lined duct?
45-55%
6
Staples and tape
Duct with insulation on the inside

8. The compressor is cooled by liquid refrigerant. (True of False)
Below 800 degrees F
By increasing the surface of the condenser coil
False
Nominal-sized tubing

9. What kind of refrigeratnts must be added in liquid form?
150
Blended refrigerants
No
20 degrees F

10. 7' round duct has a ballpark cfm of what?
150
Over 800 degrees F
45 degrees F
105 degrees F

11. What is used to measure static air pressure in ducts.
18 gauge
100 psig
Inclined manometer
Over 800 degrees F

12. What are the four materials used to make duct?
6
In parallel
Nitrogen with a small amount of refrigerant
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

13. Which type of wire can handle a higher ampacity?
8
Infiltration and ventilation
With a minimum of three evenly spaced self-tapping screws
Stranded

14. What is the normal evaporator temperature?
Any amount
150
Compressor
45 degrees F

15. What do you use to check for leaks?
Duct with insulation on the inside
Nitrogen with a small amount of refrigerant
It also rises
In series

16. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
Pull a vacuum
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Heat load

17. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Nitrogen with a small amount of refrigerant
They are physically larger
1/4'
ACR (air-conditioning refrigeration) tubing

18. How do you calculate cfm?

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19. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
Boil the liquid refrigerant out ot the oil within the crankcase
Over 800 degrees F
8

20. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
A bypass duct or a dump zone
Over 800 degrees F
Outside of the male fitting

21. What is the range for normal superheat and subcooling?
The suction line or the low-pressure side
With 4' saddles
8-12 degrees F
300

22. The evaporator is designed to remove what two types of heat?
Positive
6
Latent and sensible
High

23. The A/C size is calculated by what?
Heat load
Latent and sensible
Heat loss
Boil the liquid refrigerant out ot the oil within the crankcase

24. 6' round duct has a ballpark cfm of what?
30-35 degrees above ambient
SEER includes the energy used in the start-up and shut-down cycles
100
Outside diameter (OD)

25. 9' round duct has a ballpark cfm of what?
SEER includes the energy used in the start-up and shut-down cycles
To remove humidity and lower dry bulb temperature
300
When the system is under pressure

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

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27. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
TXV
They are larger
They are larger

28. What are the two types of package units?
Infiltration and ventilation
2
Side-by-side and over-and-under
Yes

29. The furnace size is calculated by what?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Compressor
Side-by-side and over-and-under
Heat loss

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

31. Why are some ACR tubing lines insulated?
S-clips and drives (cleats)
12000
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Inside diameter (ID)

32. If the rpm's are 1750 - how many poles does the motor have?
It will have a decrease in superheat
It also rises
4
Inches of water column (in. WC)

33. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Staples and tape
30 degrees F
ACR (air-conditioning refrigeration) tubing
With an are rating

34. What kind of metering device do high-efficiency units usually use?
TXV
Potential relay and start capacitor
8-12 degrees F
They are larger

35. What are the two types of blower drives?
With an are rating
45 degrees F
Belt drive and direct drive
Pi x radius squared

36. What is the design boiling point for most evaporator coils in residential air conditioning?
5 degrees
20 degrees above ambient
With a minimum of three evenly spaced self-tapping screws
40 degrees F

37. How many amps can 10 g wire handle?
15% silphos
The takeoff fitting
15% silphos
30 A

38. Can refrigerant line sets be altered in length?
Yes
100
ACR (air-conditioning refrigeration) tubing
8-12 degrees F

39. Do you need a trap on a pull-through evaporator?
With 4' saddles
Yes
With a minimum of three evenly spaced self-tapping screws
40 A

40. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
L-type
It rises
12000

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

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42. If the rpm's are 750 - how many poles does the motor have?
Boil the liquid refrigerant out ot the oil within the crankcase
Subtract ambient temperature from 100
No
8

43. How is ACR tubing sized?
Outside diameter (OD)
RLA/FLA x 5
Slugging
L-type

44. What component changes refrigerant from a low pressure gas to a high pressure gas?
2 minutes
30 A
Over 800 degrees F
Compressor

45. At what temperature will brazing melt?
To remove humidity and lower dry bulb temperature
When it is above a conditioned space
A dirty evaporator
Over 800 degrees F

46. What is the typical pressure differance across a TXV?
8-12 degrees F
40 degrees F
100 psig
In parallel

47. How are the condenser coils different on a high-efficiency unit?
They are larger
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
With a minimum of three evenly spaced self-tapping screws
15% silphos

48. What sort of pressure will a pull-through evaporator have?
40 degrees F
Negative
Nominal-sized tubing
It will have a decrease in superheat

49. What are the components of a hard-start kit?
5 degrees
Latent and sensible
Potential relay and start capacitor
Common

50. At what temperature will brazing melt?
100
40 degrees F
Inclined manometer
Over 800 degrees F