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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. 13 SEER is classified as what kind of efficiency?
25-ft or 50-ft
12000
With 4' saddles
High

2. If the rpm's are 1750 - how many poles does the motor have?
4
It rises
2
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

3. On what terminal do you check amperage?
With a minimum of three evenly spaced self-tapping screws
140 degrees F
It will be low
Common

4. Where do you check the amps on a motor?
Heat loss
Shorted winding - open winding - and grounded winding
Duct - electrical - and mechanical
On the common terminal

5. Do you need a trap on a pull-through evaporator?
Yes
100 psig
45-55%
RLA/FLA x 5

6. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Outside of the male fitting
2 minutes
Fiberglass
30 degrees F

7. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
Staples and tape
A swaging tool
Boil the liquid refrigerant out ot the oil within the crankcase

8. How do you calculate cfm?

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9. What do you use to check for leaks?
Inclined manometer
Nitrogen with a small amount of refrigerant
Pi x radius squared
Side-by-side and over-and-under

10. What sort of pressure will a pull-through evaporator have?
Negative
15% silphos
30 degrees F
15 A

11. What kind of metering device do high-efficiency units usually use?
TXV
Side-by-side and over-and-under
In series
On the common terminal

12. Where is insulation used on copper tubing used for air-conditioning?
They are larger
The suction line or the low-pressure side
With a minimum of three evenly spaced self-tapping screws
Rise

13. 8' round duct has a ballpark cfm of what?
12000
Outside of the male fitting
Shorted winding - open winding - and grounded winding
200

14. What are the two ways that fresh air enters a structure?
40 degrees F
Suction
5 degrees
Infiltration and ventilation

15. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
20 degrees F
Positive
TXV

16. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Nitrogen with a small amount of refrigerant
Any amount
Yes
In series

17. Most duct insulation is made of what?
To lower the amount of pressure drop through the coil
12000
Fiberglass
Heat loss

18. What are the two types of package units?
Side-by-side and over-and-under
Any amount
Potential relay and start capacitor
Below 800 degrees F

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

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20. How is nominal-sized tubing sized?
False
Standard
Inside diameter (ID)
They are physically larger

21. Which type of wire can handle a higher ampacity?
Pistons
Stranded
It will be low
4

22. What is the name of the fitting where the branch line leaves the duct?
6
A swaging tool
The takeoff fitting
Average feet per minute X area in square feet (H' x W'/144)

23. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
A dirty evaporator
Yes
Nitrogen with a small amount of refrigerant

24. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
When the system is under pressure
Any amount
400
Potential relay and start capacitor

25. How do you calculate EER?
Duct - electrical - and mechanical
Heat loss
Btu/hr (output) / wattage (input)
Any amount

26. How is flexible duct supported?
A band 4 inches or more in width
A bypass duct or a dump zone
Side-by-side and over-and-under
A dirty evaporator

27. What distributes supply air to a room in a structure?
S-clips and drives (cleats)
15% silphos
With an are rating
A diffuser

28. If the rpm's are 750 - how many poles does the motor have?
2 minutes
No
Over 800 degrees F
8

29. How do you calculate the area of a circle?
Heat load
A bypass duct or a dump zone
Pi x radius squared
Pull a vacuum

30. How will too much refrigerant effect subcooling?
ACR (air-conditioning refrigeration) tubing
Any amount
Below 800 degrees F
It will be high

31. What are the two types of return air systems in residential installations?
When it is above a conditioned space
Individual return air systems and central return air systems
Belt drive and direct drive
A bypass duct or a dump zone

32. What tool is used to expand the diameter of soft copper tubing
25-ft or 50-ft
A swaging tool
Duct with insulation on the inside
Over/under and side by side

33. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
Nominal-sized tubing
Suction
L-type

34. If the suction pressure rises - what happens to the head pressure?
105 degrees F
It also rises
Shorted winding - open winding - and grounded winding
Below 800 degrees F

35. Where do you install a trap on a drain line?
150
It rises
A diffuser
Before the vent

36. How is insulation around a duct rated?
Btu/hr (output) / wattage (input)
With an are rating
By increasing the surface of the condenser coil
15 A

37. What is the normal evaporator temperature?
45 degrees F
4
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
40 A

38. If the rpm's are 3450 - how many poles does the motor have?
Yes
With an are rating
Pistons
2

39. How is ACR tubing sized?
It rises
Outside diameter (OD)
Standard
1/4'

40. What is it called when liquid refrigerant gets into the compressor?
True
40 A
Slugging
45 degrees F

41. What are the two types of package units?
Below 800 degrees F
30 A
Side-by-side and over-and-under
It will be low

42. The fan switch closes at what temperature?
Inside diameter (ID)
S-clips and drives (cleats)
It will have a decrease in superheat
140 degrees F

43. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
8-12 degrees F
Heat load
L-type

44. How do you calculate ballpark superheat?
45 degrees F
Subtract ambient temperature from 100
Before the vent
Potential relay and start capacitor

45. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To remove humidity and lower dry bulb temperature
ACR (air-conditioning refrigeration) tubing
With 4' saddles
To lower the amount of pressure drop through the coil

46. What is considered normal operating conditions?
Potential relay and start capacitor
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
8
It will be low

47. The fan switch opens at what temperature?
On the common terminal
105 degrees F
Duct - electrical - and mechanical
A swaging tool

48. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
400
45-55%
Rise
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

49. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
High
8
Before the vent

50. How many amps can 12 g wire handle?
20 A
30 degrees F
Side-by-side and over-and-under
Rise