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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 distributes supply air to a room in a structure?
Standard
Inclined manometer
A band 4 inches or more in width
A diffuser

2. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It also rises
150
45-55%

3. What is lined duct?
8-12 degrees F
Dehydrated with caps on each end
Duct with insulation on the inside
They are physically larger

4. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Yes
Pull a vacuum
40 degrees F
Inches of water column (in. WC)

5. How do you achieve high-efficiency?
Btu/hr (output) / wattage (input)
A band 4 inches or more in width
Yes
By increasing the surface of the condenser coil

6. How long should you leave a system off once you kill power before restarting it?
Belt drive and direct drive
2 minutes
Heat load
ACR (air-conditioning refrigeration) tubing

7. What do you do after you braze a system?
Heat load
Pull a vacuum
Potential relay and start capacitor
100 psig

8. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Shorted winding - open winding - and grounded winding
L-type
S-clips and drives (cleats)
Static pressure - velocity pressure - and total pressure

9. How do you calculate the area of a circle?
On the common terminal
Pi x radius squared
L-type
Yes

10. What is the design boiling point for most evaporator coils in residential air conditioning?
A dirty evaporator
Nitrogen with a small amount of refrigerant
40 degrees F
Common

11. If the rpm's are 1050 - how many poles does the motor have?
Individual return air systems and central return air systems
6
It will have a decrease in superheat
Latent and sensible

12. What tool is used to expand the diameter of soft copper tubing
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A swaging tool
20 degrees above ambient
Yes

13. 9' round duct has a ballpark cfm of what?
Over 800 degrees F
300
Inside diameter (ID)
140 degrees F

14. 10' round duct has a ballpark cfm of what?
400
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
1/4'
With an are rating

15. If pressure rises - what happens to the superheat?
Boil the liquid refrigerant out ot the oil within the crankcase
It rises
40 degrees F
A piston type metering device

16. When do you install an auxillary drain pan?
Blended refrigerants
When it is above a conditioned space
25-ft or 50-ft
20 degrees F

17. What kind of refrigeratnts must be added in liquid form?
Shorted winding - open winding - and grounded winding
In parallel
Negative
Blended refrigerants

18. How will too much refrigerant effect superheat?
It will be low
Side-by-side and over-and-under
A dirty evaporator
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

19. How many amps can 14 g wire handle?
Suction
15 A
It will be low
100

20. 13 SEER is classified as what kind of efficiency?
45 degrees F
15% silphos
S-clips and drives (cleats)
High

21. The crankcase heater on an air-conditioning compressor is used to what?
S-clips and drives (cleats)
Vapor
Boil the liquid refrigerant out ot the oil within the crankcase
Belt drive and direct drive

22. What are normal conditions - as defined by the ARI.
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
They are larger
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

23. 10 SEER is classified as what kind of efficiency?
Outside diameter (OD)
To lower the amount of pressure drop through the coil
Standard
1/4'

24. Do you need a trap on a push-through evaporator?
Common
A band 4 inches or more in width
40 degrees F
No

25. How will too much refrigerant effect superheat?
It will be low
Indoor fan motor - outdoor fan motor - and the compressor
140 degrees F
Pi x radius squared

26. The load on the evaporater will effect which pressure?
Suction
Positive
With an are rating
With an are rating

27. Can refrigerant line sets be altered in length?
The suction line or the low-pressure side
In parallel
Yes
Duct - electrical - and mechanical

28. How do you calculate LRA?
40 degrees F
ACR (air-conditioning refrigeration) tubing
A band 4 inches or more in width
RLA/FLA x 5

29. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
A swaging tool
No
To lower the amount of pressure drop through the coil
The suction line or the low-pressure side

30. What gauge is thermostat wire?
18 gauge
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes
400

31. How do you calculate LRA?
Compressor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
RLA/FLA x 5
200

32. 10' round duct has a ballpark cfm of what?
30 A
With a minimum of three evenly spaced self-tapping screws
400
30-35 degrees above ambient

33. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Stranded
A swaging tool
105 degrees F

34. What are the three pressures created by moving air in ductwork?
They are physically larger
ACR (air-conditioning refrigeration) tubing
Shorted winding - open winding - and grounded winding
Static pressure - velocity pressure - and total pressure

35. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
RLA/FLA x 5
Static pressure - velocity pressure - and total pressure
When it is a pull-through evaporator

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

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37. How is insulation around a duct rated?
With an are rating
TXV
2 minutes
105 degrees F

38. How is nominal-sized tubing sized?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
140 degrees F
Inside diameter (ID)
100 psig

39. How is nominal-sized tubing sized?
False
Static pressure - velocity pressure - and total pressure
No
Inside diameter (ID)

40. What do you use to check for leaks?
400
200
To remove humidity and lower dry bulb temperature
Nitrogen with a small amount of refrigerant

41. On what terminal do you check amperage?
It also rises
Heat loss
Inclined manometer
Common

42. Superheat should never be below how many degrees
200
5 degrees
L-type
Yes

43. Do you need a trap on a push-through evaporator?
No
With a minimum of three evenly spaced self-tapping screws
400
On the common terminal

44. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
ACR (air-conditioning refrigeration) tubing
It will be low
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

45. What are the two types of blower drives?
400
True
25-ft or 50-ft
Belt drive and direct drive

46. What can cause a decrease in suction pressure on an air-conditioning system?
Belt drive and direct drive
A dirty evaporator
Side-by-side and over-and-under
100

47. What kind of refrigeratnts must be added in liquid form?
20 degrees above ambient
Blended refrigerants
20 A
40 degrees F

48. How do you calculate the area of a circle?
105 degrees F
Pi x radius squared
Fiberglass
Shorted winding - open winding - and grounded winding

49. What do you use to check for leaks?
Indoor fan motor - outdoor fan motor - and the compressor
True
In parallel
Nitrogen with a small amount of refrigerant

50. Do you need a trap on a pull-through evaporator?
Heat load
Stranded
Yes
A band 4 inches or more in width