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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. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
300
A bypass duct or a dump zone
Rise
Nitrogen with a small amount of refrigerant

2. What is the typical pressure differance across a TXV?
100 psig
Positive
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
With an are rating

3. What is the name of the fitting where the branch line leaves the duct?
The suction line or the low-pressure side
Belt drive and direct drive
The takeoff fitting
Yes

4. How many amps can 12 g wire handle?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Potential relay and start capacitor
Individual return air systems and central return air systems
20 A

5. What do you do after you braze a system?
ACR (air-conditioning refrigeration) tubing
Subtract ambient temperature from 100
Pull a vacuum
A dirty evaporator

6. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Rise
30 degrees F
When the system is under pressure
It also rises

7. The load on the evaporater will effect which pressure?
With 4' saddles
Nominal-sized tubing
Belt drive and direct drive
Suction

8. How will too much refrigerant effect subcooling?
Nitrogen with a small amount of refrigerant
Any amount
It will be high
A diffuser

9. 13 SEER is classified as what kind of efficiency?
High
100 psig
Compressor
Yes

10. The compressor is cooled by liquid refrigerant. (True of False)
45-55%
SEER includes the energy used in the start-up and shut-down cycles
False
With 4' saddles

11. At what temperature will soft solder melt?
Boil the liquid refrigerant out ot the oil within the crankcase
A diffuser
Below 800 degrees F
Pistons

12. The fan switch opens at what temperature?
When the system is under pressure
It also rises
105 degrees F
Fiberglass

13. Superheat should never be below how many degrees
6
5 degrees
100 psig
To remove humidity and lower dry bulb temperature

14. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
Yes
Standard
40 degrees F

15. How are round ducts supported?

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16. How do you calculate cfm?

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17. What is the typical pressure differance across a TXV?
Side-by-side and over-and-under
Staples and tape
100 psig
Outside of the male fitting

18. At what temperature will brazing melt?
Subtract ambient temperature from 100
Over 800 degrees F
In parallel
With an are rating

19. What kind of metering device do high-efficiency units usually use?
TXV
Slugging
30 degrees F
Indoor fan motor - outdoor fan motor - and the compressor

20. What are the three crafts normally associated with an air-conditioned installation?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Duct - electrical - and mechanical
Stranded
Yes

21. What kind of refrigeratnts must be added in liquid form?
100 psig
40 degrees F
Blended refrigerants
Before the vent

22. Which is more efficient - a TXV or a fixed-orifice metering device?
Belt drive and direct drive
TXV
A dirty evaporator
Yes

23. What are normal conditions - as defined by the ARI.
Stranded
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
150
Latent and sensible

24. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
1/4'
ACR (air-conditioning refrigeration) tubing
To lower the amount of pressure drop through the coil
Over/under and side by side

25. What are the two ways that fresh air enters a structure?
True
When it is above a conditioned space
40 degrees F
Infiltration and ventilation

26. Where do you install a trap on a drain line?
20 degrees above ambient
6
2 minutes
Before the vent

27. At what temperature does refrigerant condense in a standard-efficiency unit?
Slugging
30-35 degrees above ambient
On the common terminal
They are physically larger

28. Pressure in ductwork is measured In what?
Before the vent
200
105 degrees F
Inches of water column (in. WC)

29. What sort of pressure will a pull-through evaporator have?
Suction
Negative
Infiltration and ventilation
To remove humidity and lower dry bulb temperature

30. What percentage silver do you need to use for an are-410 system?
Positive
Inside diameter (ID)
Indoor fan motor - outdoor fan motor - and the compressor
15% silphos

31. How many amps can 12 g wire handle?
RLA/FLA x 5
It will be high
Pistons
20 A

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

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33. What is the design boiling point for most evaporator coils in residential air conditioning?
1/4'
Boil the liquid refrigerant out ot the oil within the crankcase
30 degrees F
40 degrees F

34. How do you calculate ballpark superheat?
Outside of the male fitting
It will be high
Subtract ambient temperature from 100
Slugging

35. 10 SEER is classified as what kind of efficiency?
Standard
12000
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Before the vent

36. What do you use to check for leaks?
8-12 degrees F
A swaging tool
Outside of the male fitting
Nitrogen with a small amount of refrigerant

37. Why are some ACR tubing lines insulated?
Nominal-sized tubing
On the common terminal
40 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

38. The fan switch closes at what temperature?
140 degrees F
Staples and tape
25-ft or 50-ft
It will be high

39. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
By increasing the surface of the condenser coil
With an are rating
TXV

40. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Negative
Suction
40 degrees F
With 4' saddles

41. The evaporator is designed to remove what two types of heat?
High
8
Latent and sensible
Outside diameter (OD)

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

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43. What are the three ways a motor can fail electrically?
Individual return air systems and central return air systems
With an are rating
20 degrees F
Shorted winding - open winding - and grounded winding

44. Where do you apply flux when soldering?
In series
150
Outside of the male fitting
400

45. Do you need a vent on a push-through evaporator?
8
With 4' saddles
Yes
Rise

46. How does ACR copper pipe come?
Dehydrated with caps on each end
45 degrees F
Subtract ambient temperature from 100
2 minutes

47. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Outside diameter (OD)
45-55%
Boil the liquid refrigerant out ot the oil within the crankcase
TXV

48. How is the high pressure switch wired with the low pressure switch?
20 degrees above ambient
In parallel
Over/under and side by side
In series

49. If the rpm's are 750 - how many poles does the motor have?
150
Nominal-sized tubing
8
They are physically larger

50. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
S-clips and drives (cleats)
Before the vent
8