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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. At what temperature will brazing melt?
Static pressure - velocity pressure - and total pressure
Over 800 degrees F
45 degrees F
With a minimum of three evenly spaced self-tapping screws

2. What kind of metering device do high-efficiency units usually use?
A dirty evaporator
Individual return air systems and central return air systems
TXV
It rises

3. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When it is above a conditioned space
150
Blended refrigerants

4. What are the two types of return air systems in residential installations?
Infiltration and ventilation
It will be high
They are larger
Individual return air systems and central return air systems

5. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
400
Yes
A piston type metering device

6. How are the condenser coils different on a high-efficiency unit?
15% silphos
Inches of water column (in. WC)
They are larger
To remove humidity and lower dry bulb temperature

7. How are the condenser coils different on a high-efficiency unit?
A diffuser
25-ft or 50-ft
They are larger
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

8. 13 SEER is classified as what kind of efficiency?
45 degrees F
It will be low
20 degrees above ambient
High

9. When do you install an auxillary drain pan?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
TXV
When it is above a conditioned space
Latent and sensible

10. What kind of copper tubing is used for plumbing and heating applications?
SEER includes the energy used in the start-up and shut-down cycles
4
Nominal-sized tubing
1/4'

11. A reciprocating compressor has what sort of moving parts?
Dehydrated with caps on each end
Pistons
Suction
2

12. Can refrigerant line sets be altered in length?
When it is a pull-through evaporator
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Belt drive and direct drive
Yes

13. How many BTU's per ton?
12000
30 degrees F
Before the vent
S-clips and drives (cleats)

14. What sort of pressure will a push-through evaporator have?
30 A
40 degrees F
Positive
Rise

15. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Average feet per minute X area in square feet (H' x W'/144)
2
A bypass duct or a dump zone
Subtract ambient temperature from 100

16. At what temperature does refrigerant condense in a high-efficiency unit?
6
20 degrees above ambient
S-clips and drives (cleats)
40 A

17. How many cfm per ton?
Inches of water column (in. WC)
TXV
400
Inclined manometer

18. How is the high pressure switch wired with the low pressure switch?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
In parallel
30 A
6

19. Most duct insulation is made of what?
Infiltration and ventilation
Fiberglass
To remove humidity and lower dry bulb temperature
Side-by-side and over-and-under

20. What are the three major power-consuming devices on an air-conditioning system?
Nominal-sized tubing
The takeoff fitting
Indoor fan motor - outdoor fan motor - and the compressor
1/4'

21. 9' round duct has a ballpark cfm of what?
Potential relay and start capacitor
300
When it is above a conditioned space
TXV

22. Which is more efficient - a TXV or a fixed-orifice metering device?
30-35 degrees above ambient
The takeoff fitting
TXV
45-55%

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

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24. What are the three pressures created by moving air in ductwork?
Slugging
Static pressure - velocity pressure - and total pressure
Yes
15 A

25. Which type of wire can handle a higher ampacity?
Outside diameter (OD)
Staples and tape
Stranded
Individual return air systems and central return air systems

26. What is the normal evaporator temperature?
45 degrees F
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Heat loss

27. What are the three major power-consuming devices on an air-conditioning system?
A piston type metering device
Boil the liquid refrigerant out ot the oil within the crankcase
Indoor fan motor - outdoor fan motor - and the compressor
30 degrees F

28. If the rpm's are 750 - how many poles does the motor have?
Nominal-sized tubing
8
Over 800 degrees F
Individual return air systems and central return air systems

29. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
200
Any amount
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

30. How do you calculate the area of a circle?
Pi x radius squared
On the common terminal
Nitrogen with a small amount of refrigerant
8-12 degrees F

31. The fan switch opens at what temperature?
Standard
Pull a vacuum
105 degrees F
In parallel

32. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
Shorted winding - open winding - and grounded winding
In parallel
Belt drive and direct drive

33. When do you install an auxillary drain pan?
100
When it is above a conditioned space
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants

34. What are the three ways a motor can fail electrically?
Nitrogen with a small amount of refrigerant
300
Common
Shorted winding - open winding - and grounded winding

35. What is the difference between SEER and EER?
It rises
On the common terminal
Before the vent
SEER includes the energy used in the start-up and shut-down cycles

36. How is nominal-sized tubing sized?
Inside diameter (ID)
100 psig
Belt drive and direct drive
40 degrees F

37. Do you need a vent on a pull-through evaporator?
Positive
300
Yes
Pistons

38. Does a package unit come from the factory pre-charged?
105 degrees F
Yes
Average feet per minute X area in square feet (H' x W'/144)
By increasing the surface of the condenser coil

39. What kind of refrigeratnts must be added in liquid form?
The takeoff fitting
Blended refrigerants
Inches of water column (in. WC)
Nitrogen with a small amount of refrigerant

40. What are the three pressures created by moving air in ductwork?
Yes
Static pressure - velocity pressure - and total pressure
It also rises
SEER includes the energy used in the start-up and shut-down cycles

41. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
It rises
Negative
When it is a pull-through evaporator

42. How are round ducts supported?

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43. What are normal conditions - as defined by the ARI.
Over/under and side by side
Nitrogen with a small amount of refrigerant
To lower the amount of pressure drop through the coil
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

44. The evaporator is designed to remove what two types of heat?
Latent and sensible
Yes
RLA/FLA x 5
15% silphos

45. What are the components of a hard-start kit?
Latent and sensible
A band 4 inches or more in width
Potential relay and start capacitor
100 psig

46. How many amps can 14 g wire handle?
15 A
4
TXV
To lower the amount of pressure drop through the coil

47. How is flexible duct supported?
A swaging tool
A band 4 inches or more in width
15% silphos
Staples and tape

48. 6' round duct has a ballpark cfm of what?
100
40 degrees F
Below 800 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

49. The furnace size is calculated by what?
Yes
To lower the amount of pressure drop through the coil
Heat loss
Below 800 degrees F

50. If the rpm's are 1750 - how many poles does the motor have?
Positive
4
Latent and sensible
No