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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. 10 SEER is classified as what kind of efficiency?
30-35 degrees above ambient
RLA/FLA x 5
Standard
Pull a vacuum

2. What are normal conditions - as defined by the ARI.
The takeoff fitting
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
A swaging tool
Over 800 degrees F

3. On what terminal do you check amperage?
Common
100 psig
Heat load
L-type

4. If the rpm's are 750 - how many poles does the motor have?
140 degrees F
2
8
On the common terminal

5. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
Belt drive and direct drive
TXV
Nominal-sized tubing

6. How is insulation around a duct rated?
45 degrees F
40 degrees F
To lower the amount of pressure drop through the coil
With an are rating

7. When must a copper joint never be soldered or brazed?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
45-55%
When the system is under pressure
25-ft or 50-ft

8. A reciprocating compressor has what sort of moving parts?
Compressor
Pistons
To lower the amount of pressure drop through the coil
Slugging

9. How is insulation around a duct rated?
With an are rating
RLA/FLA x 5
Yes
Rise

10. How many amps can 12 g wire handle?
20 A
Dehydrated with caps on each end
Over 800 degrees F
In series

11. How are round ducts connected to one another?
Subtract ambient temperature from 100
8-12 degrees F
With a minimum of three evenly spaced self-tapping screws
High

12. In what state is the refrigerant in the compressor?
40 A
Yes
TXV
Vapor

13. What type of air conditioning system must be charged using the superheat method?
With a minimum of three evenly spaced self-tapping screws
L-type
A piston type metering device
It also rises

14. What can cause a decrease in suction pressure on an air-conditioning system?
Rise
Nominal-sized tubing
A dirty evaporator
Staples and tape

15. What is the range for normal superheat and subcooling?
40 degrees F
8-12 degrees F
A diffuser
It rises

16. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
They are physically larger
The takeoff fitting
It will have a decrease in superheat
40 degrees F

17. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
6
2
Compressor
30 degrees F

18. 8' round duct has a ballpark cfm of what?
25-ft or 50-ft
200
Standard
It also rises

19. Sections of duct board can be fastened together with what?
True
Staples and tape
Suction
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

20. How is flexible duct supported?
Nitrogen with a small amount of refrigerant
A band 4 inches or more in width
To lower the amount of pressure drop through the coil
Duct - electrical - and mechanical

21. What is the name of the fitting where the branch line leaves the duct?
200
Duct with insulation on the inside
The takeoff fitting
Heat loss

22. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Nitrogen with a small amount of refrigerant
Heat load
Potential relay and start capacitor

23. What are the two types of package units?
To remove humidity and lower dry bulb temperature
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Side-by-side and over-and-under
Btu/hr (output) / wattage (input)

24. How do you calculate cfm?

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25. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Before the vent
False
Heat load

26. How many amps can 10 g wire handle?
Indoor fan motor - outdoor fan motor - and the compressor
18 gauge
In series
30 A

27. What do you use to check for leaks?
Subtract ambient temperature from 100
Static pressure - velocity pressure - and total pressure
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Nitrogen with a small amount of refrigerant

28. What sort of pressure will a push-through evaporator have?
Pistons
Fiberglass
Slugging
Positive

29. What are the four materials used to make duct?
RLA/FLA x 5
Nominal-sized tubing
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes

30. How will too much refrigerant effect subcooling?
It will be high
When it is above a conditioned space
Average feet per minute X area in square feet (H' x W'/144)
Suction

31. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
With an are rating
45-55%
L-type

32. At what temperature will soft solder melt?
Below 800 degrees F
2 minutes
To lower the amount of pressure drop through the coil
It rises

33. How is ACR tubing sized?
RLA/FLA x 5
12000
Suction
Outside diameter (OD)

34. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
45-55%
In parallel
Outside of the male fitting

35. 13 SEER is classified as what kind of efficiency?
High
It will have a decrease in superheat
TXV
2

36. If pressure rises - what happens to the superheat?
15% silphos
Blended refrigerants
It rises
Common

37. How is nominal-sized tubing sized?
400
Infiltration and ventilation
Inside diameter (ID)
To remove humidity and lower dry bulb temperature

38. What are the three ways a motor can fail electrically?
High
Shorted winding - open winding - and grounded winding
Inches of water column (in. WC)
400

39. The evaporator is designed to remove what two types of heat?
With 4' saddles
Latent and sensible
2 minutes
Standard

40. Do you need a vent on a pull-through evaporator?
The suction line or the low-pressure side
A bypass duct or a dump zone
8-12 degrees F
Yes

41. How will too much refrigerant effect superheat?
It will be low
S-clips and drives (cleats)
ACR (air-conditioning refrigeration) tubing
Indoor fan motor - outdoor fan motor - and the compressor

42. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
15 A
4
140 degrees F

43. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
400
Nitrogen with a small amount of refrigerant
Heat loss

44. What kind of copper tubing is used for plumbing and heating applications?
Pi x radius squared
False
Stranded
Nominal-sized tubing

45. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
140 degrees F
150
45-55%
Yes

46. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
Nominal-sized tubing
140 degrees F
Potential relay and start capacitor

47. How long should you leave a system off once you kill power before restarting it?
With an are rating
30-35 degrees above ambient
2 minutes
Yes

48. When do you install a trap on a drain line?
40 degrees F
When it is a pull-through evaporator
15 A
150

49. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
Average feet per minute X area in square feet (H' x W'/144)
105 degrees F
40 degrees F

50. What is the name of the fitting where the branch line leaves the duct?
Yes
The takeoff fitting
Side-by-side and over-and-under
The suction line or the low-pressure side