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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. Sections of duct board can be fastened together with what?
They are physically larger
Btu/hr (output) / wattage (input)
Staples and tape
RLA/FLA x 5

2. 10' round duct has a ballpark cfm of what?
400
25-ft or 50-ft
It will have a decrease in superheat
Over 800 degrees F

3. How do you calculate EER?
Btu/hr (output) / wattage (input)
To remove humidity and lower dry bulb temperature
150
They are physically larger

4. What kind of copper tubing is used for plumbing and heating applications?
Average feet per minute X area in square feet (H' x W'/144)
Outside diameter (OD)
Nominal-sized tubing
20 degrees F

5. The furnace size is calculated by what?
It rises
Boil the liquid refrigerant out ot the oil within the crankcase
Standard
Heat loss

6. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
Heat loss
Yes
Blended refrigerants

7. At what temperature will brazing melt?
Positive
Individual return air systems and central return air systems
30 degrees F
Over 800 degrees F

8. If the rpm's are 750 - how many poles does the motor have?
The suction line or the low-pressure side
ACR (air-conditioning refrigeration) tubing
100 psig
8

9. If pressure rises - what happens to the superheat?
It rises
105 degrees F
Subtract ambient temperature from 100
It will be high

10. How many amps can 8 g wire handle?
18 gauge
Shorted winding - open winding - and grounded winding
Yes
40 A

11. What do you do after you braze a system?
Heat loss
Pull a vacuum
S-clips and drives (cleats)
Before the vent

12. If the rpm's are 1750 - how many poles does the motor have?
Slugging
40 degrees F
4
Stranded

13. What are the two ways that fresh air enters a structure?
2
Infiltration and ventilation
Common
Suction

14. Pressure in ductwork is measured In what?
Yes
Duct with insulation on the inside
Inches of water column (in. WC)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

15. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
18 gauge
A bypass duct or a dump zone
Staples and tape
150

16. The compressor is cooled by liquid refrigerant. (True of False)
30 A
By increasing the surface of the condenser coil
Inside diameter (ID)
False

17. If the rpm's are 1750 - how many poles does the motor have?
4
Positive
Suction
Infiltration and ventilation

18. Why are some ACR tubing lines insulated?
In parallel
A piston type metering device
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

19. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
It will be high
To lower the amount of pressure drop through the coil
A diffuser
ACR (air-conditioning refrigeration) tubing

20. Does a package unit come from the factory pre-charged?
Over/under and side by side
With 4' saddles
L-type
Yes

21. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Over 800 degrees F
Inside diameter (ID)
It will have a decrease in superheat
2 minutes

22. How will too much refrigerant effect superheat?
Outside of the male fitting
20 degrees F
In series
It will be low

23. What sort of pressure will a pull-through evaporator have?
Boil the liquid refrigerant out ot the oil within the crankcase
Over/under and side by side
Negative
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

24. What sort of pressure will a pull-through evaporator have?
Negative
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
30 degrees F
15% silphos

25. How many amps can 12 g wire handle?
20 A
A dirty evaporator
100
Inches of water column (in. WC)

26. How do you calculate cfm?

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27. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
30 A
Infiltration and ventilation
Duct - electrical - and mechanical
20 degrees F

28. What are the two types of blower drives?
ACR (air-conditioning refrigeration) tubing
Negative
When it is a pull-through evaporator
Belt drive and direct drive

29. How many BTU's per ton?
A swaging tool
12000
Standard
Blended refrigerants

30. What type of air conditioning system must be charged using the superheat method?
Btu/hr (output) / wattage (input)
Any amount
30 A
A piston type metering device

31. How will too much refrigerant effect superheat?
A piston type metering device
Over/under and side by side
Boil the liquid refrigerant out ot the oil within the crankcase
It will be low

32. 6' round duct has a ballpark cfm of what?
A piston type metering device
It will have a decrease in superheat
20 A
100

33. How long should you leave a system off once you kill power before restarting it?
Btu/hr (output) / wattage (input)
2 minutes
Boil the liquid refrigerant out ot the oil within the crankcase
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

34. How will too much refrigerant effect subcooling?
40 A
Fiberglass
It will be high
30 A

35. Do you need a vent on a push-through evaporator?
4
200
Positive
Yes

36. What are normal conditions - as defined by the ARI.
To remove humidity and lower dry bulb temperature
In series
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Suction

37. What is the range for normal superheat and subcooling?
Staples and tape
8-12 degrees F
300
Duct with insulation on the inside

38. What tool is used to expand the diameter of soft copper tubing
400
A swaging tool
Inches of water column (in. WC)
Potential relay and start capacitor

39. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
Belt drive and direct drive
Over 800 degrees F
The suction line or the low-pressure side

40. How do you calculate the area of a circle?
12000
The suction line or the low-pressure side
Pi x radius squared
Standard

41. What is used to measure static air pressure in ducts.
It will be high
Inclined manometer
A dirty evaporator
40 A

42. How is flexible duct supported?
Heat load
Outside of the male fitting
A band 4 inches or more in width
30-35 degrees above ambient

43. On what terminal do you check amperage?
Dehydrated with caps on each end
It rises
Common
18 gauge

44. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Rise
ACR (air-conditioning refrigeration) tubing
They are physically larger
It rises

45. 10' round duct has a ballpark cfm of what?
400
True
Duct - electrical - and mechanical
Individual return air systems and central return air systems

46. How many amps can 14 g wire handle?
A band 4 inches or more in width
Indoor fan motor - outdoor fan motor - and the compressor
Dehydrated with caps on each end
15 A

47. What is lined duct?
400
Duct with insulation on the inside
12000
In parallel

48. The evaporator is designed to remove what two types of heat?
Heat load
Side-by-side and over-and-under
Latent and sensible
Negative

49. How do you calculate ballpark superheat?
100 psig
Subtract ambient temperature from 100
Negative
20 degrees F

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

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