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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. 10' round duct has a ballpark cfm of what?
Duct with insulation on the inside
400
Side-by-side and over-and-under
Heat load
2. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
TXV
In series
30-35 degrees above ambient
L-type
3. How do you calculate EER?
With 4' saddles
Btu/hr (output) / wattage (input)
When the system is under pressure
Indoor fan motor - outdoor fan motor - and the compressor
4. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
With a minimum of three evenly spaced self-tapping screws
Below 800 degrees F
In series
It also rises
5. Do you need a trap on a pull-through evaporator?
They are larger
Yes
High
Standard
6. The A/C size is calculated by what?
2
With a minimum of three evenly spaced self-tapping screws
Heat load
Indoor fan motor - outdoor fan motor - and the compressor
7. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Rise
With a minimum of three evenly spaced self-tapping screws
25-ft or 50-ft
8. If the rpm's are 1050 - how many poles does the motor have?
A swaging tool
False
6
Dehydrated with caps on each end
9. How many amps can 10 g wire handle?
A band 4 inches or more in width
High
TXV
30 A
10. On what terminal do you check amperage?
Standard
Common
False
A swaging tool
11. The crankcase heater on an air-conditioning compressor is used to what?
150
RLA/FLA x 5
Potential relay and start capacitor
Boil the liquid refrigerant out ot the oil within the crankcase
12. How do you calculate the area of a circle?
Stranded
2 minutes
Pi x radius squared
Duct with insulation on the inside
13. When do you install a trap on a drain line?
When it is a pull-through evaporator
Heat load
20 A
Suction
14. Sections of duct board can be fastened together with what?
Over/under and side by side
Staples and tape
No
100 psig
15. What sort of pressure will a pull-through evaporator have?
Side-by-side and over-and-under
When it is above a conditioned space
45 degrees F
Negative
16. At what temperature will brazing melt?
No
Over 800 degrees F
Heat load
Staples and tape
17. In what state is the refrigerant in the compressor?
A dirty evaporator
Duct with insulation on the inside
A bypass duct or a dump zone
Vapor
18. If the rpm's are 1050 - how many poles does the motor have?
Any amount
12000
25-ft or 50-ft
6
19. What are the four materials used to make duct?
To remove humidity and lower dry bulb temperature
105 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Duct - electrical - and mechanical
20. What are the two basic duct connection configurations for package units supply and return air ducts?
Outside of the male fitting
Over/under and side by side
Inclined manometer
8-12 degrees F
21. What are the three pressures created by moving air in ductwork?
To remove humidity and lower dry bulb temperature
With an are rating
30 A
Static pressure - velocity pressure - and total pressure
22. What percentage silver do you need to use for an are-410 system?
Latent and sensible
15% silphos
12000
By increasing the surface of the condenser coil
23. If the rpm's are 3450 - how many poles does the motor have?
Dehydrated with caps on each end
2
Heat load
Average feet per minute X area in square feet (H' x W'/144)
24. 6' round duct has a ballpark cfm of what?
100
TXV
150
200
25. 9' round duct has a ballpark cfm of what?
Outside diameter (OD)
300
20 degrees above ambient
Vapor
26. What is used to measure static air pressure in ducts.
With an are rating
8
Inclined manometer
Compressor
27. How many amps can 8 g wire handle?
A band 4 inches or more in width
40 A
Heat load
Indoor fan motor - outdoor fan motor - and the compressor
28. What is considered normal operating conditions?
300
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Nominal-sized tubing
Inside diameter (ID)
29. What do you use to check for leaks?
It also rises
Stranded
To lower the amount of pressure drop through the coil
Nitrogen with a small amount of refrigerant
30. How is flexible duct supported?
400
When it is above a conditioned space
A band 4 inches or more in width
A dirty evaporator
31. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Slugging
S-clips and drives (cleats)
20 degrees F
Inclined manometer
32. How is insulation around a duct rated?
It rises
40 A
150
With an are rating
33. How do you calculate ballpark superheat?
A band 4 inches or more in width
Subtract ambient temperature from 100
False
Slugging
34. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Nitrogen with a small amount of refrigerant
SEER includes the energy used in the start-up and shut-down cycles
It will have a decrease in superheat
35. What is a package unit?
40 degrees F
To lower the amount of pressure drop through the coil
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
36. 8' round duct has a ballpark cfm of what?
Outside diameter (OD)
Positive
200
It will be low
37. What do you do after you braze a system?
Pull a vacuum
100
Compressor
Blended refrigerants
38. A reciprocating compressor has what sort of moving parts?
Pistons
The suction line or the low-pressure side
It will be low
A bypass duct or a dump zone
39. Most duct insulation is made of what?
Duct - electrical - and mechanical
To remove humidity and lower dry bulb temperature
Blended refrigerants
Fiberglass
40. What sort of pressure will a push-through evaporator have?
When it is a pull-through evaporator
Positive
With an are rating
Standard
41. The load on the evaporater will effect which pressure?
Suction
2
The takeoff fitting
Inclined manometer
42. What percentage silver do you need to use for an are-410 system?
15% silphos
Stranded
Pull a vacuum
The suction line or the low-pressure side
43. What gauge is thermostat wire?
18 gauge
They are larger
By increasing the surface of the condenser coil
Before the vent
44. How are round ducts supported?
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183
45. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
A swaging tool
Over 800 degrees F
40 degrees F
Inches of water column (in. WC)
46. The furnace size is calculated by what?
40 degrees F
100 psig
Side-by-side and over-and-under
Heat loss
47. Does a package unit come from the factory pre-charged?
Before the vent
200
Yes
ACR (air-conditioning refrigeration) tubing
48. What is the typical pressure differance across a TXV?
They are physically larger
100 psig
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Rise
49. If the rpm's are 3450 - how many poles does the motor have?
2
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
The takeoff fitting
18 gauge
50. What can cause a decrease in suction pressure on an air-conditioning system?
TXV
300
Btu/hr (output) / wattage (input)
A dirty evaporator