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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?
Nominal-sized tubing
Over 800 degrees F
30 A
Potential relay and start capacitor

2. Do you need a vent on a pull-through evaporator?
Yes
They are physically larger
Yes
Over 800 degrees F

3. How is nominal-sized tubing sized?
False
12000
To lower the amount of pressure drop through the coil
Inside diameter (ID)

4. How do you calculate cfm?

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5. What are the three pressures created by moving air in ductwork?
It will have a decrease in superheat
Static pressure - velocity pressure - and total pressure
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Individual return air systems and central return air systems

6. If the suction pressure rises - what happens to the head pressure?
In parallel
It also rises
Infiltration and ventilation
400

7. The furnace size is calculated by what?
On the common terminal
Heat loss
8-12 degrees F
Individual return air systems and central return air systems

8. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Common
20 degrees F
Over/under and side by side
Nitrogen with a small amount of refrigerant

9. What is lined duct?
Blended refrigerants
Fiberglass
Duct with insulation on the inside
The takeoff fitting

10. What distributes supply air to a room in a structure?
Side-by-side and over-and-under
No
A diffuser
Nominal-sized tubing

11. How many BTU's per ton?
400
12000
Yes
Inches of water column (in. WC)

12. A reciprocating compressor has what sort of moving parts?
100 psig
It will be high
Pistons
Over/under and side by side

13. What kind of copper tubing is used for refrigeration or air-conditioning applications?
They are larger
ACR (air-conditioning refrigeration) tubing
To remove humidity and lower dry bulb temperature
Common

14. What kind of metering device do high-efficiency units usually use?
TXV
It also rises
140 degrees F
The suction line or the low-pressure side

15. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Average feet per minute X area in square feet (H' x W'/144)
False
5 degrees
True

16. What sort of pressure will a pull-through evaporator have?
20 degrees above ambient
Before the vent
Negative
15% silphos

17. How many amps can 12 g wire handle?
In series
To remove humidity and lower dry bulb temperature
20 A
By increasing the surface of the condenser coil

18. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Yes
105 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
A bypass duct or a dump zone

19. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
True
They are larger
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

20. What is the typical pressure differance across a TXV?
Outside of the male fitting
1/4'
20 degrees above ambient
100 psig

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

22. Where do you apply flux when soldering?
A dirty evaporator
Yes
Shorted winding - open winding - and grounded winding
Outside of the male fitting

23. How is insulation around a duct rated?
With an are rating
It will be high
25-ft or 50-ft
True

24. How do you calculate EER?
20 degrees F
Btu/hr (output) / wattage (input)
Belt drive and direct drive
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

25. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
45-55%
1/4'
Yes

26. What is the normal evaporator temperature?
It will have a decrease in superheat
25-ft or 50-ft
Side-by-side and over-and-under
45 degrees F

27. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
TXV
Any amount
Suction

28. If the rpm's are 1750 - how many poles does the motor have?
Negative
Yes
4
12000

29. The evaporator is designed to remove what two types of heat?
Latent and sensible
When it is a pull-through evaporator
False
To lower the amount of pressure drop through the coil

30. Where do you check the amps on a motor?
40 degrees F
Any amount
Over 800 degrees F
On the common terminal

31. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
5 degrees
105 degrees F
To remove humidity and lower dry bulb temperature

32. What kind of copper tubing is used for plumbing and heating applications?
A bypass duct or a dump zone
It will be low
Nominal-sized tubing
In series

33. At what temperature will brazing melt?
Potential relay and start capacitor
Heat loss
Over 800 degrees F
TXV

34. How is flexible duct supported?
Fiberglass
12000
A band 4 inches or more in width
Potential relay and start capacitor

35. Why are some ACR tubing lines insulated?
In series
A bypass duct or a dump zone
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
200

36. What are the three crafts normally associated with an air-conditioned installation?
The suction line or the low-pressure side
Duct - electrical - and mechanical
TXV
20 degrees F

37. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
With 4' saddles
4
Potential relay and start capacitor

38. How many amps can 10 g wire handle?
RLA/FLA x 5
30 A
Over/under and side by side
40 A

39. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Side-by-side and over-and-under
Inside diameter (ID)
Any amount
To lower the amount of pressure drop through the coil

40. Can refrigerant line sets be altered in length?
SEER includes the energy used in the start-up and shut-down cycles
A swaging tool
45-55%
Yes

41. If the rpm's are 1750 - how many poles does the motor have?
4
30 A
L-type
To remove humidity and lower dry bulb temperature

42. Do you need a trap on a pull-through evaporator?
Yes
40 degrees F
2
Shorted winding - open winding - and grounded winding

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

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44. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
Side-by-side and over-and-under
40 degrees F
RLA/FLA x 5

45. What is the design boiling point for most evaporator coils in residential air conditioning?
Inches of water column (in. WC)
Indoor fan motor - outdoor fan motor - and the compressor
40 degrees F
Inclined manometer

46. How do you achieve high-efficiency?
Side-by-side and over-and-under
5 degrees
Common
By increasing the surface of the condenser coil

47. Pressure in ductwork is measured In what?
Boil the liquid refrigerant out ot the oil within the crankcase
Duct - electrical - and mechanical
18 gauge
Inches of water column (in. WC)

48. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
Pi x radius squared
15% silphos
By increasing the surface of the condenser coil

49. How do you calculate the area of a circle?
6
8
25-ft or 50-ft
Pi x radius squared

50. What are normal conditions - as defined by the ARI.
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
8
Heat loss