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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 the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
400
TXV
8

2. The evaporator is designed to remove what two types of heat?
Yes
To remove humidity and lower dry bulb temperature
Latent and sensible
Individual return air systems and central return air systems

3. When must a copper joint never be soldered or brazed?
High
With a minimum of three evenly spaced self-tapping screws
When the system is under pressure
Inches of water column (in. WC)

4. What are the three crafts normally associated with an air-conditioned installation?
200
Duct - electrical - and mechanical
6
100 psig

5. When must a copper joint never be soldered or brazed?
When the system is under pressure
Rise
Duct with insulation on the inside
1/4'

6. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
2 minutes
Static pressure - velocity pressure - and total pressure
40 degrees F

7. How is ACR tubing sized?
45-55%
With a minimum of three evenly spaced self-tapping screws
Outside diameter (OD)
15 A

8. What sort of pressure will a pull-through evaporator have?
Infiltration and ventilation
S-clips and drives (cleats)
Subtract ambient temperature from 100
Negative

9. In what state is the refrigerant in the compressor?
Vapor
200
To remove humidity and lower dry bulb temperature
True

10. Why are some ACR tubing lines insulated?
When the system is under pressure
Average feet per minute X area in square feet (H' x W'/144)
105 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

11. What is the difference between SEER and EER?
Heat loss
In series
100 psig
SEER includes the energy used in the start-up and shut-down cycles

12. A reciprocating compressor has what sort of moving parts?
Duct with insulation on the inside
5 degrees
Pistons
Inclined manometer

13. What gauge is thermostat wire?
It rises
18 gauge
With 4' saddles
They are physically larger

14. Which type of wire can handle a higher ampacity?
Potential relay and start capacitor
400
Stranded
Pull a vacuum

15. What tool is used to expand the diameter of soft copper tubing
ACR (air-conditioning refrigeration) tubing
Over 800 degrees F
A swaging tool
300

16. Do you need a vent on a push-through evaporator?
It will be low
Yes
Belt drive and direct drive
Staples and tape

17. At what temperature does refrigerant condense in a standard-efficiency unit?
Yes
30-35 degrees above ambient
Duct with insulation on the inside
Potential relay and start capacitor

18. If the rpm's are 3450 - how many poles does the motor have?
25-ft or 50-ft
2
Latent and sensible
No

19. If the rpm's are 750 - how many poles does the motor have?
100 psig
8
Infiltration and ventilation
TXV

20. What type of air conditioning system must be charged using the superheat method?
30 degrees F
Yes
300
A piston type metering device

21. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
With a minimum of three evenly spaced self-tapping screws
Dehydrated with caps on each end
30 degrees F
200

22. If the rpm's are 1050 - how many poles does the motor have?
6
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
They are physically larger
A diffuser

23. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
Inclined manometer
Duct - electrical - and mechanical
140 degrees F

24. If pressure rises - what happens to the superheat?
The suction line or the low-pressure side
It rises
Nominal-sized tubing
Stranded

25. How is the high pressure switch wired with the low pressure switch?
By increasing the surface of the condenser coil
4
In parallel
40 degrees F

26. What are the two basic duct connection configurations for package units supply and return air ducts?
4
Blended refrigerants
Over/under and side by side
The suction line or the low-pressure side

27. Can refrigerant line sets be altered in length?
Yes
With a minimum of three evenly spaced self-tapping screws
100
No

28. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
300
No
30-35 degrees above ambient
A bypass duct or a dump zone

29. At what temperature will brazing melt?
Over 800 degrees F
Outside of the male fitting
Btu/hr (output) / wattage (input)
Subtract ambient temperature from 100

30. What are normal conditions - as defined by the ARI.
They are physically larger
Outside diameter (OD)
Positive
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

31. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
SEER includes the energy used in the start-up and shut-down cycles
With an are rating
30 degrees F

32. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
In parallel
Nominal-sized tubing
They are physically larger

33. At what temperature does refrigerant condense in a high-efficiency unit?
Infiltration and ventilation
105 degrees F
20 degrees above ambient
They are physically larger

34. What are the components of a hard-start kit?
With a minimum of three evenly spaced self-tapping screws
2
No
Potential relay and start capacitor

35. The evaporator is designed to remove what two types of heat?
Yes
Latent and sensible
Staples and tape
30 degrees F

36. When do you install an auxillary drain pan?
45-55%
When it is above a conditioned space
ACR (air-conditioning refrigeration) tubing
30 A

37. Sections of duct board can be fastened together with what?
Inside diameter (ID)
Staples and tape
12000
Common

38. What is the normal evaporator temperature?
45 degrees F
S-clips and drives (cleats)
Blended refrigerants
30 degrees F

39. What are the three pressures created by moving air in ductwork?
30 A
Inclined manometer
High
Static pressure - velocity pressure - and total pressure

40. The A/C size is calculated by what?
ACR (air-conditioning refrigeration) tubing
40 A
20 degrees F
Heat load

41. What is the typical pressure differance across a TXV?
Potential relay and start capacitor
To remove humidity and lower dry bulb temperature
100 psig
Boil the liquid refrigerant out ot the oil within the crankcase

42. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
40 degrees F
On the common terminal
In series
A swaging tool

43. How are round ducts supported?

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44. If the suction pressure rises - what happens to the head pressure?
To remove humidity and lower dry bulb temperature
It also rises
Positive
2 minutes

45. 9' round duct has a ballpark cfm of what?
Slugging
2
300
Pistons

46. Do you need a trap on a pull-through evaporator?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Below 800 degrees F
Yes

47. Pressure in ductwork is measured In what?
Side-by-side and over-and-under
12000
The suction line or the low-pressure side
Inches of water column (in. WC)

48. What kind of copper tubing is used for refrigeration or air-conditioning applications?
20 degrees F
ACR (air-conditioning refrigeration) tubing
When it is above a conditioned space
Positive

49. What are the two functions of the air-conditioning system?
When the system is under pressure
Yes
To remove humidity and lower dry bulb temperature
Vapor

50. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
It will have a decrease in superheat
Yes
L-type