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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. The fan switch closes at what temperature?
100
To remove humidity and lower dry bulb temperature
300
140 degrees F

2. How is insulation around a duct rated?
Negative
40 degrees F
Subtract ambient temperature from 100
With an are rating

3. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Rise
Yes
40 degrees F
It will have a decrease in superheat

4. 10' round duct has a ballpark cfm of what?
25-ft or 50-ft
Heat loss
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
400

5. How is ACR tubing sized?
Any amount
Boil the liquid refrigerant out ot the oil within the crankcase
Inside diameter (ID)
Outside diameter (OD)

6. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
TXV
They are larger
With an are rating

7. What sort of pressure will a pull-through evaporator have?
Potential relay and start capacitor
30-35 degrees above ambient
Negative
300

8. 10 SEER is classified as what kind of efficiency?
A piston type metering device
Standard
20 A
SEER includes the energy used in the start-up and shut-down cycles

9. Do you need a trap on a push-through evaporator?
No
A diffuser
1/4'
Heat load

10. How many cfm per ton?
300
400
18 gauge
Pi x radius squared

11. How is nominal-sized tubing sized?
Indoor fan motor - outdoor fan motor - and the compressor
Inside diameter (ID)
100 psig
30-35 degrees above ambient

12. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
With a minimum of three evenly spaced self-tapping screws
45-55%
To lower the amount of pressure drop through the coil
Outside of the male fitting

13. How are the condenser coils different on a high-efficiency unit?
S-clips and drives (cleats)
They are larger
A band 4 inches or more in width
A band 4 inches or more in width

14. What is the name of the fitting where the branch line leaves the duct?
Infiltration and ventilation
A swaging tool
The takeoff fitting
Duct - electrical - and mechanical

15. What sort of pressure will a push-through evaporator have?
Yes
Positive
45-55%
40 degrees F

16. What can cause a decrease in suction pressure on an air-conditioning system?
200
It rises
A dirty evaporator
Pistons

17. If the rpm's are 1750 - how many poles does the motor have?
4
25-ft or 50-ft
30 degrees F
Pistons

18. If the rpm's are 1050 - how many poles does the motor have?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Boil the liquid refrigerant out ot the oil within the crankcase
6
30 A

19. Which type of wire can handle a higher ampacity?
A bypass duct or a dump zone
Infiltration and ventilation
Over/under and side by side
Stranded

20. How is flexible duct supported?
A band 4 inches or more in width
Slugging
30 A
They are larger

21. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
A swaging tool
15% silphos
A bypass duct or a dump zone

22. 7' round duct has a ballpark cfm of what?
Pi x radius squared
When it is above a conditioned space
20 A
150

23. 7' round duct has a ballpark cfm of what?
Blended refrigerants
Yes
Any amount
150

24. How do you calculate LRA?
Yes
8-12 degrees F
When it is a pull-through evaporator
RLA/FLA x 5

25. Where do you check the amps on a motor?
On the common terminal
Yes
Side-by-side and over-and-under
False

26. The furnace size is calculated by what?
Heat loss
A swaging tool
TXV
In parallel

27. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Boil the liquid refrigerant out ot the oil within the crankcase
Duct with insulation on the inside
On the common terminal

28. A reciprocating compressor has what sort of moving parts?
They are physically larger
A bypass duct or a dump zone
Pistons
100

29. How many amps can 12 g wire handle?
8-12 degrees F
45-55%
20 A
Nominal-sized tubing

30. At what temperature will brazing melt?
Rise
Over 800 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When it is a pull-through evaporator

31. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
150
400
40 degrees F
Vapor

32. How are the condenser coils different on a high-efficiency unit?
They are larger
Positive
Yes
Outside of the male fitting

33. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
With 4' saddles
12000
Outside of the male fitting
Any amount

34. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
Vapor
Subtract ambient temperature from 100
When it is above a conditioned space

35. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
A swaging tool
Inside diameter (ID)
4
They are physically larger

36. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Indoor fan motor - outdoor fan motor - and the compressor
By increasing the surface of the condenser coil
L-type
To lower the amount of pressure drop through the coil

37. The fan switch opens at what temperature?
100
Any amount
Over/under and side by side
105 degrees F

38. 10' round duct has a ballpark cfm of what?
A dirty evaporator
400
Pistons
Dehydrated with caps on each end

39. 9' round duct has a ballpark cfm of what?
25-ft or 50-ft
300
High
Btu/hr (output) / wattage (input)

40. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Outside diameter (OD)
S-clips and drives (cleats)
SEER includes the energy used in the start-up and shut-down cycles
It will have a decrease in superheat

41. 6' round duct has a ballpark cfm of what?
30 A
Yes
Heat loss
100

42. How do you calculate cfm?

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43. Which is more efficient - a TXV or a fixed-orifice metering device?
Rise
They are larger
Inclined manometer
TXV

44. Does a package unit come from the factory pre-charged?
Outside diameter (OD)
Boil the liquid refrigerant out ot the oil within the crankcase
L-type
Yes

45. How will too much refrigerant effect superheat?
Inches of water column (in. WC)
It will be low
100
Outside of the male fitting

46. Superheat should never be below how many degrees
Btu/hr (output) / wattage (input)
5 degrees
Vapor
40 A

47. What percentage silver do you need to use for an are-410 system?
15% silphos
A piston type metering device
With 4' saddles
RLA/FLA x 5

48. What is the range for normal superheat and subcooling?
45-55%
With 4' saddles
8-12 degrees F
30 A

49. In what state is the refrigerant in the compressor?
Vapor
Dehydrated with caps on each end
SEER includes the energy used in the start-up and shut-down cycles
Inclined manometer

50. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Standard
45 degrees F
True
They are larger