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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?
Static pressure - velocity pressure - and total pressure
Staples and tape
45 degrees F
A band 4 inches or more in width

2. How is insulation around a duct rated?
Pull a vacuum
Subtract ambient temperature from 100
No
With an are rating

3. What sort of pressure will a push-through evaporator have?
Positive
In series
Inches of water column (in. WC)
The suction line or the low-pressure side

4. What kind of metering device do high-efficiency units usually use?
18 gauge
Indoor fan motor - outdoor fan motor - and the compressor
Side-by-side and over-and-under
TXV

5. How do you calculate EER?
Average feet per minute X area in square feet (H' x W'/144)
400
Btu/hr (output) / wattage (input)
A band 4 inches or more in width

6. How do you achieve high-efficiency?
6
30 degrees F
By increasing the surface of the condenser coil
The suction line or the low-pressure side

7. If the suction pressure rises - what happens to the head pressure?
When it is above a conditioned space
Positive
It also rises
It rises

8. What are the two functions of the air-conditioning system?
105 degrees F
Heat loss
To remove humidity and lower dry bulb temperature
Yes

9. What is the name of the fitting where the branch line leaves the duct?
6
The takeoff fitting
Stranded
TXV

10. The furnace size is calculated by what?
SEER includes the energy used in the start-up and shut-down cycles
8
Heat loss
8-12 degrees F

11. Where is insulation used on copper tubing used for air-conditioning?
12000
The suction line or the low-pressure side
Yes
Inclined manometer

12. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Nitrogen with a small amount of refrigerant
Blended refrigerants
High
Any amount

13. How many BTU's per ton?
In series
Duct with insulation on the inside
Suction
12000

14. What sort of pressure will a pull-through evaporator have?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
In parallel
Duct with insulation on the inside
Negative

15. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
Boil the liquid refrigerant out ot the oil within the crankcase
A dirty evaporator
Pi x radius squared

16. Do you need a vent on a push-through evaporator?
The suction line or the low-pressure side
15 A
Yes
400

17. The fan switch opens at what temperature?
105 degrees F
20 degrees above ambient
Positive
Latent and sensible

18. If the rpm's are 1750 - how many poles does the motor have?
Rise
Standard
4
Infiltration and ventilation

19. Where do you apply flux when soldering?
They are physically larger
Outside of the male fitting
105 degrees F
100

20. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
45 degrees F
They are physically larger
Pistons

21. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Yes
With an are rating
200
30 degrees F

22. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
20 degrees F
Yes
Outside diameter (OD)

23. How is nominal-sized tubing sized?
A diffuser
Inclined manometer
Inside diameter (ID)
100 psig

24. What are the two ways that fresh air enters a structure?
45 degrees F
Infiltration and ventilation
Indoor fan motor - outdoor fan motor - and the compressor
Heat load

25. How will too much refrigerant effect subcooling?
Indoor fan motor - outdoor fan motor - and the compressor
Vapor
It will be high
Over 800 degrees F

26. What can cause a decrease in suction pressure on an air-conditioning system?
15 A
Subtract ambient temperature from 100
A dirty evaporator
Pi x radius squared

27. The fan switch opens at what temperature?
TXV
105 degrees F
Yes
Heat load

28. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
45 degrees F
Staples and tape
Inches of water column (in. WC)
Any amount

29. How is ACR tubing sized?
20 degrees F
Outside diameter (OD)
Below 800 degrees F
Static pressure - velocity pressure - and total pressure

30. How are round ducts supported?

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31. How will too much refrigerant effect subcooling?
Duct with insulation on the inside
By increasing the surface of the condenser coil
It will be high
Over 800 degrees F

32. How does ACR copper pipe come?
Rise
400
Dehydrated with caps on each end
With a minimum of three evenly spaced self-tapping screws

33. How many amps can 12 g wire handle?
Belt drive and direct drive
15% silphos
Side-by-side and over-and-under
20 A

34. The evaporator is designed to remove what two types of heat?
Latent and sensible
Negative
On the common terminal
By increasing the surface of the condenser coil

35. How are the condenser coils different on a high-efficiency unit?
45-55%
They are larger
Blended refrigerants
8

36. How many amps can 10 g wire handle?
30 A
Inches of water column (in. WC)
Duct - electrical - and mechanical
To lower the amount of pressure drop through the coil

37. What kind of refrigeratnts must be added in liquid form?
A diffuser
30 degrees F
Blended refrigerants
8

38. The compressor is cooled by liquid refrigerant. (True of False)
Subtract ambient temperature from 100
Standard
140 degrees F
False

39. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
140 degrees F
It will have a decrease in superheat
False
30 A

40. What is the normal evaporator temperature?
It will be low
L-type
Shorted winding - open winding - and grounded winding
45 degrees F

41. How is nominal-sized tubing sized?
45 degrees F
A band 4 inches or more in width
Yes
Inside diameter (ID)

42. 13 SEER is classified as what kind of efficiency?
High
A bypass duct or a dump zone
Average feet per minute X area in square feet (H' x W'/144)
With a minimum of three evenly spaced self-tapping screws

43. Sections of duct board can be fastened together with what?
Staples and tape
Below 800 degrees F
30 degrees F
TXV

44. At what temperature will soft solder melt?
Pull a vacuum
Yes
300
Below 800 degrees F

45. How do you achieve high-efficiency?
Inside diameter (ID)
RLA/FLA x 5
By increasing the surface of the condenser coil
Average feet per minute X area in square feet (H' x W'/144)

46. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Nominal-sized tubing
They are physically larger
45-55%
No

47. What are the two types of blower drives?
True
Belt drive and direct drive
Yes
105 degrees F

48. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Boil the liquid refrigerant out ot the oil within the crankcase
30 degrees F
S-clips and drives (cleats)
Yes

49. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
Average feet per minute X area in square feet (H' x W'/144)
Negative
Vapor

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

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