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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. How do you calculate EER?
The suction line or the low-pressure side
Btu/hr (output) / wattage (input)
A bypass duct or a dump zone
TXV

2. A reciprocating compressor has what sort of moving parts?
100
Dehydrated with caps on each end
Pistons
The suction line or the low-pressure side

3. What sort of pressure will a pull-through evaporator have?
Btu/hr (output) / wattage (input)
Yes
When the system is under pressure
Negative

4. What are the three major power-consuming devices on an air-conditioning system?
20 A
15% silphos
Indoor fan motor - outdoor fan motor - and the compressor
They are physically larger

5. When do you install an auxillary drain pan?
200
Heat load
When it is above a conditioned space
Blended refrigerants

6. What are the two types of blower drives?
Pi x radius squared
Belt drive and direct drive
TXV
30 A

7. The load on the evaporater will effect which pressure?
Blended refrigerants
To lower the amount of pressure drop through the coil
Suction
Yes

8. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Compressor
It also rises
Infiltration and ventilation

9. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Fiberglass
Yes
Infiltration and ventilation
They are physically larger

10. How is the high pressure switch wired with the low pressure switch?
In parallel
Staples and tape
Any amount
It also rises

11. How do you calculate LRA?
RLA/FLA x 5
When it is above a conditioned space
Average feet per minute X area in square feet (H' x W'/144)
With a minimum of three evenly spaced self-tapping screws

12. How is ACR tubing sized?
20 degrees above ambient
15% silphos
Outside diameter (OD)
It will be low

13. The evaporator is designed to remove what two types of heat?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
45-55%
Latent and sensible
4

14. In what length rolls is soft copper tubing normally available?
A band 4 inches or more in width
20 degrees F
25-ft or 50-ft
40 A

15. The furnace size is calculated by what?
Negative
Pistons
Any amount
Heat loss

16. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
By increasing the surface of the condenser coil
In series
L-type

17. What gauge is thermostat wire?
Stranded
20 A
12000
18 gauge

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

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19. If the rpm's are 3450 - how many poles does the motor have?
Over/under and side by side
20 degrees above ambient
2
Below 800 degrees F

20. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
8-12 degrees F
20 degrees F
They are physically larger

21. Which type of wire can handle a higher ampacity?
Stranded
20 A
Infiltration and ventilation
Over 800 degrees F

22. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
105 degrees F
Standard
2 minutes

23. Pressure in ductwork is measured In what?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Inches of water column (in. WC)
5 degrees
Inclined manometer

24. What are the four materials used to make duct?
When the system is under pressure
Duct - electrical - and mechanical
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Subtract ambient temperature from 100

25. What kind of refrigeratnts must be added in liquid form?
Heat load
Static pressure - velocity pressure - and total pressure
Blended refrigerants
Compressor

26. The fan switch closes at what temperature?
140 degrees F
Shorted winding - open winding - and grounded winding
To remove humidity and lower dry bulb temperature
Positive

27. How many amps can 8 g wire handle?
40 A
It also rises
Latent and sensible
Static pressure - velocity pressure - and total pressure

28. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
Dehydrated with caps on each end
150
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

29. How many amps can 14 g wire handle?
105 degrees F
Inches of water column (in. WC)
15 A
They are physically larger

30. What are the three major power-consuming devices on an air-conditioning system?
It rises
Slugging
Indoor fan motor - outdoor fan motor - and the compressor
15 A

31. How is flexible duct supported?
A band 4 inches or more in width
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
4
Negative

32. What sort of pressure will a push-through evaporator have?
Positive
Dehydrated with caps on each end
Below 800 degrees F
5 degrees

33. How long should you leave a system off once you kill power before restarting it?
By increasing the surface of the condenser coil
2 minutes
Compressor
1/4'

34. The A/C size is calculated by what?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Inclined manometer
Heat load
When it is above a conditioned space

35. Why are some ACR tubing lines insulated?
Latent and sensible
In series
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Blended refrigerants

36. Where do you apply flux when soldering?
A piston type metering device
In series
Belt drive and direct drive
Outside of the male fitting

37. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
ACR (air-conditioning refrigeration) tubing
In series
Inches of water column (in. WC)
2

38. What are the three crafts normally associated with an air-conditioned installation?
With a minimum of three evenly spaced self-tapping screws
Duct - electrical - and mechanical
Yes
Outside diameter (OD)

39. Where do you install a trap on a drain line?
Slugging
20 degrees F
Before the vent
When the system is under pressure

40. What is the normal evaporator temperature?
It rises
Inclined manometer
150
45 degrees F

41. 8' round duct has a ballpark cfm of what?
A swaging tool
4
200
A dirty evaporator

42. At what temperature will soft solder melt?
Average feet per minute X area in square feet (H' x W'/144)
Individual return air systems and central return air systems
Below 800 degrees F
When the system is under pressure

43. What is lined duct?
400
Before the vent
45-55%
Duct with insulation on the inside

44. What are the four materials used to make duct?
Average feet per minute X area in square feet (H' x W'/144)
Boil the liquid refrigerant out ot the oil within the crankcase
It rises
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

45. 10' round duct has a ballpark cfm of what?
15 A
400
On the common terminal
To lower the amount of pressure drop through the coil

46. What distributes supply air to a room in a structure?
25-ft or 50-ft
100
A diffuser
Heat load

47. How is ACR tubing sized?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Yes
Outside diameter (OD)
They are larger

48. Sections of duct board can be fastened together with what?
Boil the liquid refrigerant out ot the oil within the crankcase
Staples and tape
Indoor fan motor - outdoor fan motor - and the compressor
2 minutes

49. The load on the evaporater will effect which pressure?
Nitrogen with a small amount of refrigerant
400
Suction
Over 800 degrees F

50. What percentage silver do you need to use for an are-410 system?
40 degrees F
15% silphos
20 A
TXV