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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. The compressor is cooled by liquid refrigerant. (True of False)
Any amount
Over 800 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
False
2. What kind of refrigeratnts must be added in liquid form?
In parallel
Blended refrigerants
Side-by-side and over-and-under
L-type
3. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Boil the liquid refrigerant out ot the oil within the crankcase
Slugging
30-35 degrees above ambient
4. What are the components of a hard-start kit?
15 A
Potential relay and start capacitor
With a minimum of three evenly spaced self-tapping screws
They are physically larger
5. How are the condenser coils different on a high-efficiency unit?
They are larger
The suction line or the low-pressure side
On the common terminal
Fiberglass
6. What is a package unit?
Potential relay and start capacitor
400
A swaging tool
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
7. Where is insulation used on copper tubing used for air-conditioning?
40 degrees F
Side-by-side and over-and-under
Negative
The suction line or the low-pressure side
8. How much does a drain line need to drop per foot of length?
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9. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
40 degrees F
Potential relay and start capacitor
A diffuser
10. The fan switch closes at what temperature?
To lower the amount of pressure drop through the coil
400
140 degrees F
By increasing the surface of the condenser coil
11. When do you install an auxillary drain pan?
Btu/hr (output) / wattage (input)
When it is above a conditioned space
It will be low
A band 4 inches or more in width
12. What are the two ways that fresh air enters a structure?
Heat loss
Stranded
A band 4 inches or more in width
Infiltration and ventilation
13. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
20 degrees above ambient
A swaging tool
They are physically larger
14. On what terminal do you check amperage?
4
Common
Positive
Inclined manometer
15. How will too much refrigerant effect superheat?
Btu/hr (output) / wattage (input)
Over 800 degrees F
It will be low
Inside diameter (ID)
16. When must a copper joint never be soldered or brazed?
Yes
When the system is under pressure
S-clips and drives (cleats)
True
17. Where is insulation used on copper tubing used for air-conditioning?
Yes
6
Static pressure - velocity pressure - and total pressure
The suction line or the low-pressure side
18. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
The suction line or the low-pressure side
Side-by-side and over-and-under
Below 800 degrees F
19. The crankcase heater on an air-conditioning compressor is used to what?
Latent and sensible
TXV
30 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
20. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
30 degrees F
To remove humidity and lower dry bulb temperature
It will be high
21. How are round ducts supported?
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22. How many amps can 10 g wire handle?
20 degrees F
When the system is under pressure
40 A
30 A
23. What distributes supply air to a room in a structure?
Any amount
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A diffuser
S-clips and drives (cleats)
24. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Potential relay and start capacitor
With 4' saddles
Standard
25. How many amps can 10 g wire handle?
8-12 degrees F
30 A
Yes
15% silphos
26. How do you calculate EER?
To lower the amount of pressure drop through the coil
Btu/hr (output) / wattage (input)
2
Over 800 degrees F
27. Pressure in ductwork is measured In what?
It will be high
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Inches of water column (in. WC)
It will be low
28. Which type of wire can handle a higher ampacity?
High
Stranded
On the common terminal
Standard
29. What do you do after you braze a system?
Pull a vacuum
5 degrees
Blended refrigerants
20 degrees F
30. At what temperature does refrigerant condense in a standard-efficiency unit?
105 degrees F
It also rises
Yes
30-35 degrees above ambient
31. A reciprocating compressor has what sort of moving parts?
Inclined manometer
30 degrees F
Pistons
The suction line or the low-pressure side
32. What is the normal evaporator temperature?
Blended refrigerants
Subtract ambient temperature from 100
45 degrees F
Outside diameter (OD)
33. What sort of pressure will a push-through evaporator have?
On the common terminal
Positive
Potential relay and start capacitor
In series
34. How do you calculate LRA?
RLA/FLA x 5
Latent and sensible
150
Any amount
35. Does a package unit come from the factory pre-charged?
20 A
In parallel
Yes
A swaging tool
36. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
1/4'
Over 800 degrees F
30 degrees F
Blended refrigerants
37. What can cause a decrease in suction pressure on an air-conditioning system?
Dehydrated with caps on each end
Latent and sensible
A dirty evaporator
Suction
38. Where do you apply flux when soldering?
Latent and sensible
TXV
Outside of the male fitting
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
39. Does a package unit come from the factory pre-charged?
Compressor
200
With an are rating
Yes
40. 6' round duct has a ballpark cfm of what?
With a minimum of three evenly spaced self-tapping screws
TXV
Average feet per minute X area in square feet (H' x W'/144)
100
41. What is the design boiling point for most evaporator coils in residential air conditioning?
Yes
Duct - electrical - and mechanical
100 psig
40 degrees F
42. Can refrigerant line sets be altered in length?
Yes
Outside diameter (OD)
100
Rise
43. At what temperature will soft solder melt?
No
Btu/hr (output) / wattage (input)
Below 800 degrees F
Suction
44. 9' round duct has a ballpark cfm of what?
When it is a pull-through evaporator
300
Negative
40 A
45. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
Individual return air systems and central return air systems
2 minutes
45 degrees F
46. If the rpm's are 750 - how many poles does the motor have?
8
40 degrees F
Infiltration and ventilation
In series
47. 10' round duct has a ballpark cfm of what?
400
RLA/FLA x 5
Outside diameter (OD)
Btu/hr (output) / wattage (input)
48. Which is more efficient - a TXV or a fixed-orifice metering device?
It will be high
TXV
The suction line or the low-pressure side
Heat loss
49. If the rpm's are 1050 - how many poles does the motor have?
Btu/hr (output) / wattage (input)
6
Inside diameter (ID)
Before the vent
50. How do you achieve high-efficiency?
Pull a vacuum
Slugging
By increasing the surface of the condenser coil
Common