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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. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
A swaging tool
Outside diameter (OD)
45-55%
20 degrees above ambient

2. 13 SEER is classified as what kind of efficiency?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
High
Fiberglass
Over/under and side by side

3. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
The takeoff fitting
They are larger
They are physically larger
It will be low

4. What are the four materials used to make duct?
150
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Duct - electrical - and mechanical
Positive

5. What kind of copper tubing is used for refrigeration or air-conditioning applications?
With an are rating
Belt drive and direct drive
No
ACR (air-conditioning refrigeration) tubing

6. Pressure in ductwork is measured In what?
The suction line or the low-pressure side
Standard
Inches of water column (in. WC)
They are physically larger

7. If the rpm's are 3450 - how many poles does the motor have?
20 degrees above ambient
Potential relay and start capacitor
2
Nitrogen with a small amount of refrigerant

8. What is the name of the fitting where the branch line leaves the duct?
It will be low
The takeoff fitting
105 degrees F
With an are rating

9. At what temperature will soft solder melt?
Below 800 degrees F
6
When it is a pull-through evaporator
With an are rating

10. What is considered normal operating conditions?
When it is a pull-through evaporator
Vapor
Latent and sensible
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

11. What are the three ways a motor can fail electrically?
S-clips and drives (cleats)
A band 4 inches or more in width
Latent and sensible
Shorted winding - open winding - and grounded winding

12. How are round ducts supported?

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13. How long should you leave a system off once you kill power before restarting it?
By increasing the surface of the condenser coil
20 degrees above ambient
Pistons
2 minutes

14. What is the normal evaporator temperature?
When the system is under pressure
True
45 degrees F
105 degrees F

15. How is ACR tubing sized?
When it is a pull-through evaporator
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Outside diameter (OD)
Static pressure - velocity pressure - and total pressure

16. 10' round duct has a ballpark cfm of what?
4
400
High
False

17. At what temperature does refrigerant condense in a high-efficiency unit?
It rises
20 degrees above ambient
15% silphos
12000

18. Superheat should never be below how many degrees
25-ft or 50-ft
Positive
Standard
5 degrees

19. How does ACR copper pipe come?
Dehydrated with caps on each end
L-type
High
Stranded

20. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
5 degrees
Duct with insulation on the inside
Belt drive and direct drive

21. How many amps can 14 g wire handle?
15 A
40 degrees F
Belt drive and direct drive
A piston type metering device

22. Where do you apply flux when soldering?
Pistons
Outside of the male fitting
Pull a vacuum
Rise

23. How is the high pressure switch wired with the low pressure switch?
25-ft or 50-ft
In parallel
Yes
A diffuser

24. How will too much refrigerant effect subcooling?
Pi x radius squared
To remove humidity and lower dry bulb temperature
TXV
It will be high

25. How do you calculate LRA?
RLA/FLA x 5
Outside of the male fitting
Negative
18 gauge

26. If pressure rises - what happens to the superheat?
It rises
Outside of the male fitting
Yes
20 degrees F

27. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
1/4'
Static pressure - velocity pressure - and total pressure
A piston type metering device

28. In what state is the refrigerant in the compressor?
Vapor
Infiltration and ventilation
Average feet per minute X area in square feet (H' x W'/144)
Over/under and side by side

29. Which is more efficient - a TXV or a fixed-orifice metering device?
150
They are larger
TXV
It rises

30. The fan switch closes at what temperature?
140 degrees F
1/4'
Before the vent
45-55%

31. What is the typical pressure differance across a TXV?
300
400
Outside diameter (OD)
100 psig

32. How will too much refrigerant effect subcooling?
High
It will be high
They are larger
Before the vent

33. What is it called when liquid refrigerant gets into the compressor?
20 A
Slugging
300
It will be low

34. If the rpm's are 3450 - how many poles does the motor have?
Vapor
True
When it is above a conditioned space
2

35. How will too much refrigerant effect superheat?
It will be low
Before the vent
30-35 degrees above ambient
Inside diameter (ID)

36. What kind of metering device do high-efficiency units usually use?
TXV
The suction line or the low-pressure side
It rises
They are physically larger

37. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
It will have a decrease in superheat
400
Indoor fan motor - outdoor fan motor - and the compressor
L-type

38. Where do you check the amps on a motor?
Belt drive and direct drive
Outside of the male fitting
4
On the common terminal

39. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
RLA/FLA x 5
Common
20 degrees F
They are larger

40. The evaporator is designed to remove what two types of heat?
It will have a decrease in superheat
Vapor
Latent and sensible
30-35 degrees above ambient

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

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42. 9' round duct has a ballpark cfm of what?
Yes
300
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Infiltration and ventilation

43. How are the condenser coils different on a high-efficiency unit?
30-35 degrees above ambient
Stranded
1/4'
They are larger

44. What are the four materials used to make duct?
Vapor
Suction
Yes
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

45. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
A bypass duct or a dump zone
By increasing the surface of the condenser coil
Staples and tape
40 degrees F

46. How is flexible duct supported?
A band 4 inches or more in width
To lower the amount of pressure drop through the coil
True
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

47. Which type of wire can handle a higher ampacity?
To lower the amount of pressure drop through the coil
Rise
Stranded
40 degrees F

48. What is lined duct?
Negative
Static pressure - velocity pressure - and total pressure
20 degrees F
Duct with insulation on the inside

49. What do you use to connect square and rectangular ductboard together?
Side-by-side and over-and-under
Average feet per minute X area in square feet (H' x W'/144)
20 A
S-clips and drives (cleats)

50. 6' round duct has a ballpark cfm of what?
Pi x radius squared
Yes
100
Infiltration and ventilation