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Test your basic knowledge |
Residential Air Conditioning
Start Test
Study First
Subjects
:
engineering
,
nate
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 range for normal superheat and subcooling?
20 A
8-12 degrees F
150
Yes
2. How much does a drain line need to drop per foot of length?
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3. How is the high pressure switch wired with the low pressure switch?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
In parallel
40 degrees F
L-type
4. How is flexible duct supported?
Blended refrigerants
40 degrees F
A band 4 inches or more in width
Yes
5. Does a package unit come from the factory pre-charged?
4
Yes
5 degrees
15% silphos
6. What are the two functions of the air-conditioning system?
Heat loss
Nitrogen with a small amount of refrigerant
To remove humidity and lower dry bulb temperature
In parallel
7. How will too much refrigerant effect superheat?
It will be low
It will be high
2
Boil the liquid refrigerant out ot the oil within the crankcase
8. What gauge is thermostat wire?
Yes
300
Blended refrigerants
18 gauge
9. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
Heat loss
12000
False
10. How is nominal-sized tubing sized?
No
Inside diameter (ID)
15 A
Suction
11. How many amps can 10 g wire handle?
Duct - electrical - and mechanical
S-clips and drives (cleats)
It will have a decrease in superheat
30 A
12. What are the two basic duct connection configurations for package units supply and return air ducts?
Boil the liquid refrigerant out ot the oil within the crankcase
Infiltration and ventilation
20 degrees F
Over/under and side by side
13. What component changes refrigerant from a low pressure gas to a high pressure gas?
Yes
Yes
Compressor
In parallel
14. What is the typical pressure differance across a TXV?
When it is a pull-through evaporator
Inclined manometer
100 psig
Pi x radius squared
15. What distributes supply air to a room in a structure?
TXV
100 psig
Outside of the male fitting
A diffuser
16. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
The takeoff fitting
Yes
They are physically larger
17. What sort of pressure will a push-through evaporator have?
With a minimum of three evenly spaced self-tapping screws
When the system is under pressure
4
Positive
18. What are the three major power-consuming devices on an air-conditioning system?
30 A
Below 800 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
Inches of water column (in. WC)
19. What are the four materials used to make duct?
Pull a vacuum
Average feet per minute X area in square feet (H' x W'/144)
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
45 degrees F
20. What are the components of a hard-start kit?
Vapor
100 psig
ACR (air-conditioning refrigeration) tubing
Potential relay and start capacitor
21. What kind of metering device do high-efficiency units usually use?
1/4'
12000
Slugging
TXV
22. Do you need a vent on a push-through evaporator?
Yes
100
400
25-ft or 50-ft
23. Most duct insulation is made of what?
To remove humidity and lower dry bulb temperature
Yes
Inclined manometer
Fiberglass
24. What is considered normal operating conditions?
20 degrees F
A diffuser
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws
25. 8' round duct has a ballpark cfm of what?
Belt drive and direct drive
200
No
45-55%
26. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
15% silphos
45-55%
Average feet per minute X area in square feet (H' x W'/144)
It will be low
27. Where do you check the amps on a motor?
Duct with insulation on the inside
Yes
On the common terminal
45-55%
28. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
They are larger
150
Yes
29. How many amps can 8 g wire handle?
Infiltration and ventilation
40 A
Pistons
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
30. What percentage silver do you need to use for an are-410 system?
15% silphos
Individual return air systems and central return air systems
The takeoff fitting
Nominal-sized tubing
31. If pressure rises - what happens to the superheat?
They are physically larger
It rises
Pull a vacuum
To lower the amount of pressure drop through the coil
32. What kind of refrigeratnts must be added in liquid form?
Static pressure - velocity pressure - and total pressure
Blended refrigerants
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
15% silphos
33. What are the components of a hard-start kit?
12000
To lower the amount of pressure drop through the coil
Potential relay and start capacitor
TXV
34. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Over/under and side by side
Nitrogen with a small amount of refrigerant
A dirty evaporator
35. What is the typical pressure differance across a TXV?
Shorted winding - open winding - and grounded winding
Side-by-side and over-and-under
100 psig
Dehydrated with caps on each end
36. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
A band 4 inches or more in width
A bypass duct or a dump zone
ACR (air-conditioning refrigeration) tubing
37. How are round ducts connected to one another?
45-55%
With a minimum of three evenly spaced self-tapping screws
Indoor fan motor - outdoor fan motor - and the compressor
12000
38. Do you need a vent on a push-through evaporator?
Pistons
2 minutes
Yes
Stranded
39. 6' round duct has a ballpark cfm of what?
Inches of water column (in. WC)
100
1/4'
Shorted winding - open winding - and grounded winding
40. The A/C size is calculated by what?
40 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Belt drive and direct drive
Heat load
41. Can refrigerant line sets be altered in length?
It also rises
Yes
1/4'
By increasing the surface of the condenser coil
42. How is ACR tubing sized?
Outside diameter (OD)
When it is a pull-through evaporator
TXV
Rise
43. Sections of duct board can be fastened together with what?
5 degrees
Pull a vacuum
Staples and tape
Suction
44. At what temperature will soft solder melt?
Over/under and side by side
Average feet per minute X area in square feet (H' x W'/144)
Below 800 degrees F
20 degrees F
45. The evaporator is designed to remove what two types of heat?
TXV
Btu/hr (output) / wattage (input)
Standard
Latent and sensible
46. How are round ducts supported?
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47. How do you achieve high-efficiency?
8-12 degrees F
12000
By increasing the surface of the condenser coil
Before the vent
48. What are the three pressures created by moving air in ductwork?
It will be low
Dehydrated with caps on each end
Static pressure - velocity pressure - and total pressure
It rises
49. What tool is used to expand the diameter of soft copper tubing
They are larger
A swaging tool
Heat load
A diffuser
50. Most duct insulation is made of what?
It will have a decrease in superheat
Fiberglass
Compressor
Pistons
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