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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 is used to measure static air pressure in ducts.
Inclined manometer
By increasing the surface of the condenser coil
200
In series

2. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
100 psig
Over/under and side by side
Inside diameter (ID)

3. Sections of duct board can be fastened together with what?
Yes
Static pressure - velocity pressure - and total pressure
It will be low
Staples and tape

4. What are the three crafts normally associated with an air-conditioned installation?
Yes
100
Duct - electrical - and mechanical
Vapor

5. What is the name of the fitting where the branch line leaves the duct?
Indoor fan motor - outdoor fan motor - and the compressor
The takeoff fitting
20 A
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

6. How is the high pressure switch wired with the low pressure switch?
Inclined manometer
40 degrees F
In parallel
Stranded

7. The A/C size is calculated by what?
Heat load
15 A
8
High

8. How do you calculate LRA?
5 degrees
ACR (air-conditioning refrigeration) tubing
RLA/FLA x 5
Duct - electrical - and mechanical

9. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Duct with insulation on the inside
To lower the amount of pressure drop through the coil
A swaging tool
100 psig

10. What are the two types of package units?
Side-by-side and over-and-under
Latent and sensible
RLA/FLA x 5
12000

11. The fan switch closes at what temperature?
Inches of water column (in. WC)
140 degrees F
150
20 A

12. What is the typical pressure differance across a TXV?
300
High
A band 4 inches or more in width
100 psig

13. What is the range for normal superheat and subcooling?
8-12 degrees F
2
SEER includes the energy used in the start-up and shut-down cycles
40 degrees F

14. If the rpm's are 3450 - how many poles does the motor have?
With 4' saddles
Yes
400
2

15. What are the three crafts normally associated with an air-conditioned installation?
45 degrees F
Duct - electrical - and mechanical
In series
100

16. How is nominal-sized tubing sized?
Any amount
Inside diameter (ID)
20 degrees F
Indoor fan motor - outdoor fan motor - and the compressor

17. What sort of pressure will a push-through evaporator have?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
To remove humidity and lower dry bulb temperature
1/4'
Positive

18. Do you need a vent on a push-through evaporator?
2
No
Yes
Nominal-sized tubing

19. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
Inclined manometer
Infiltration and ventilation
In series

20. A reciprocating compressor has what sort of moving parts?
4
Dehydrated with caps on each end
Pistons
Any amount

21. When do you install an auxillary drain pan?
Yes
TXV
When it is above a conditioned space
105 degrees F

22. How do you calculate LRA?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Infiltration and ventilation
2
RLA/FLA x 5

23. How will too much refrigerant effect superheat?
When it is a pull-through evaporator
It will be low
Latent and sensible
On the common terminal

24. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Pull a vacuum
It will be low
True
In parallel

25. If the rpm's are 750 - how many poles does the motor have?
8
Yes
When the system is under pressure
TXV

26. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
No
40 A
150

27. How do you calculate cfm?

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28. The fan switch opens at what temperature?
They are larger
8
105 degrees F
40 degrees F

29. How many cfm per ton?
Subtract ambient temperature from 100
400
With an are rating
Outside of the male fitting

30. What are the three ways a motor can fail electrically?
To remove humidity and lower dry bulb temperature
A piston type metering device
Shorted winding - open winding - and grounded winding
Outside of the male fitting

31. In what state is the refrigerant in the compressor?
Blended refrigerants
Outside of the male fitting
Nominal-sized tubing
Vapor

32. How many amps can 14 g wire handle?
It will be low
2 minutes
Rise
15 A

33. What is the design boiling point for most evaporator coils in residential air conditioning?
A band 4 inches or more in width
40 degrees F
A dirty evaporator
It rises

34. How does ACR copper pipe come?
Inclined manometer
Infiltration and ventilation
150
Dehydrated with caps on each end

35. 8' round duct has a ballpark cfm of what?
The takeoff fitting
Fiberglass
200
Duct with insulation on the inside

36. Most duct insulation is made of what?
Fiberglass
TXV
20 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

37. Will a dirty condenser cause a rise or fall in pressure?
Rise
Any amount
105 degrees F
100

38. The evaporator is designed to remove what two types of heat?
When it is above a conditioned space
With an are rating
When it is a pull-through evaporator
Latent and sensible

39. How many amps can 12 g wire handle?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Shorted winding - open winding - and grounded winding
20 A
L-type

40. What is lined duct?
To lower the amount of pressure drop through the coil
Duct with insulation on the inside
To remove humidity and lower dry bulb temperature
Inside diameter (ID)

41. When do you install an auxillary drain pan?
Below 800 degrees F
20 degrees F
18 gauge
When it is above a conditioned space

42. At what temperature does refrigerant condense in a high-efficiency unit?
Standard
Rise
Indoor fan motor - outdoor fan motor - and the compressor
20 degrees above ambient

43. How will too much refrigerant effect subcooling?
It also rises
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It will be high
Pull a vacuum

44. Most duct insulation is made of what?
RLA/FLA x 5
Fiberglass
30-35 degrees above ambient
20 degrees above ambient

45. What distributes supply air to a room in a structure?
150
The takeoff fitting
A diffuser
In parallel

46. How long should you leave a system off once you kill power before restarting it?
Yes
Inclined manometer
Nominal-sized tubing
2 minutes

47. 10' round duct has a ballpark cfm of what?
Yes
400
30 degrees F
Slugging

48. How do you calculate cfm?

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49. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Nitrogen with a small amount of refrigerant
140 degrees F
Individual return air systems and central return air systems
ACR (air-conditioning refrigeration) tubing

50. A reciprocating compressor has what sort of moving parts?
Pistons
A piston type metering device
15 A
Vapor