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. When do you install a trap on a drain line?
A piston type metering device
When it is a pull-through evaporator
The takeoff fitting
With a minimum of three evenly spaced self-tapping screws


2. The furnace size is calculated by what?
Heat loss
A band 4 inches or more in width
TXV
With a minimum of three evenly spaced self-tapping screws


3. Do you need a vent on a pull-through evaporator?
Nominal-sized tubing
Yes
False
In parallel


4. On what terminal do you check amperage?
Yes
Compressor
To lower the amount of pressure drop through the coil
Common


5. How are round ducts connected to one another?
Standard
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
With a minimum of three evenly spaced self-tapping screws
With 4' saddles


6. How many BTU's per ton?
Nitrogen with a small amount of refrigerant
By increasing the surface of the condenser coil
12000
Inclined manometer


7. How is insulation around a duct rated?
Standard
With an are rating
Standard
400


8. What do you use to connect square and rectangular ductboard together?
Stranded
S-clips and drives (cleats)
Latent and sensible
15 A


9. 10' round duct has a ballpark cfm of what?
18 gauge
Nominal-sized tubing
400
RLA/FLA x 5


10. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Staples and tape
Subtract ambient temperature from 100
Duct - electrical - and mechanical
20 degrees F


11. How do you calculate the area of a circle?
In parallel
Boil the liquid refrigerant out ot the oil within the crankcase
100 psig
Pi x radius squared


12. How are round ducts supported?

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13. The load on the evaporater will effect which pressure?
Suction
100 psig
Static pressure - velocity pressure - and total pressure
RLA/FLA x 5


14. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
They are physically larger
A diffuser
5 degrees


15. What do you do after you braze a system?
Any amount
Pull a vacuum
5 degrees
12000


16. How are round ducts supported?

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17. How do you calculate cfm?

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18. At what temperature does refrigerant condense in a high-efficiency unit?
2 minutes
20 degrees above ambient
Inches of water column (in. WC)
Nitrogen with a small amount of refrigerant


19. If the suction pressure rises - what happens to the head pressure?
40 degrees F
It also rises
Vapor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity


20. How do you calculate ballpark superheat?
100
A dirty evaporator
The suction line or the low-pressure side
Subtract ambient temperature from 100


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

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22. What tool is used to expand the diameter of soft copper tubing
20 degrees above ambient
By increasing the surface of the condenser coil
A swaging tool
SEER includes the energy used in the start-up and shut-down cycles


23. What is the normal evaporator temperature?
45 degrees F
Positive
When it is a pull-through evaporator
Stranded


24. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Heat load
In series
Standard
105 degrees F


25. How will too much refrigerant effect superheat?
It will be low
With a minimum of three evenly spaced self-tapping screws
Shorted winding - open winding - and grounded winding
8-12 degrees F


26. What are the two types of package units?
It also rises
40 degrees F
Side-by-side and over-and-under
15 A


27. In what length rolls is soft copper tubing normally available?
It also rises
45-55%
25-ft or 50-ft
When it is a pull-through evaporator


28. Superheat should never be below how many degrees
Rise
Side-by-side and over-and-under
Dehydrated with caps on each end
5 degrees


29. How do you calculate ballpark superheat?
RLA/FLA x 5
Subtract ambient temperature from 100
A bypass duct or a dump zone
Individual return air systems and central return air systems


30. 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
On the common terminal
Nitrogen with a small amount of refrigerant
Infiltration and ventilation


31. 13 SEER is classified as what kind of efficiency?
RLA/FLA x 5
20 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
High


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

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33. How is flexible duct supported?
TXV
It will be high
A band 4 inches or more in width
150


34. What do you use to connect square and rectangular ductboard together?
High
They are larger
Staples and tape
S-clips and drives (cleats)


35. Where do you apply flux when soldering?
A dirty evaporator
Pull a vacuum
400
Outside of the male fitting


36. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Boil the liquid refrigerant out ot the oil within the crankcase
It rises
On the common terminal
40 degrees F


37. What are the three ways a motor can fail electrically?
Infiltration and ventilation
Rise
Shorted winding - open winding - and grounded winding
The suction line or the low-pressure side


38. Where do you install a trap on a drain line?
Before the vent
Below 800 degrees F
Rise
TXV


39. If the rpm's are 750 - how many poles does the motor have?
8
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
SEER includes the energy used in the start-up and shut-down cycles
Potential relay and start capacitor


40. What are the two ways that fresh air enters a structure?
With a minimum of three evenly spaced self-tapping screws
A diffuser
Infiltration and ventilation
It also rises


41. What sort of pressure will a push-through evaporator have?
Pull a vacuum
Latent and sensible
100 psig
Positive


42. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
Individual return air systems and central return air systems
In series
20 A


43. The A/C size is calculated by what?
Heat load
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Blended refrigerants
Individual return air systems and central return air systems


44. How many amps can 12 g wire handle?
200
105 degrees F
Individual return air systems and central return air systems
20 A


45. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
It will be low
By increasing the surface of the condenser coil
Over/under and side by side


46. When must a copper joint never be soldered or brazed?
2
When the system is under pressure
Fiberglass
400


47. How is flexible duct supported?
Negative
400
A band 4 inches or more in width
Compressor


48. Will a dirty condenser cause a rise or fall in pressure?
40 A
TXV
With an are rating
Rise


49. If the rpm's are 1750 - how many poles does the motor have?
Outside of the male fitting
400
4
Duct with insulation on the inside


50. Where do you apply flux when soldering?
Outside of the male fitting
Duct with insulation on the inside
The takeoff fitting
1/4'