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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. How many amps can 10 g wire handle?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
30 A
They are physically larger
It rises
2. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Shorted winding - open winding - and grounded winding
20 A
3. 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
Compressor
2 minutes
Slugging
4. How will too much refrigerant effect superheat?
It will be low
To lower the amount of pressure drop through the coil
In parallel
200
5. How do you calculate ballpark superheat?
Standard
Subtract ambient temperature from 100
30-35 degrees above ambient
150
6. If the suction pressure rises - what happens to the head pressure?
Indoor fan motor - outdoor fan motor - and the compressor
45 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
It also rises
7. 13 SEER is classified as what kind of efficiency?
Yes
High
Dehydrated with caps on each end
Indoor fan motor - outdoor fan motor - and the compressor
8. What do you use to check for leaks?
30 degrees F
Nitrogen with a small amount of refrigerant
It also rises
Yes
9. How many BTU's per ton?
Heat loss
12000
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
With an are rating
10. Where do you install a trap on a drain line?
Before the vent
A bypass duct or a dump zone
Standard
No
11. If pressure rises - what happens to the superheat?
To remove humidity and lower dry bulb temperature
It rises
Average feet per minute X area in square feet (H' x W'/144)
SEER includes the energy used in the start-up and shut-down cycles
12. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
They are larger
2
Any amount
20 A
13. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
2 minutes
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
45-55%
Nominal-sized tubing
14. What are the components of a hard-start kit?
Static pressure - velocity pressure - and total pressure
In series
Potential relay and start capacitor
When the system is under pressure
15. Sections of duct board can be fastened together with what?
Yes
Staples and tape
2
200
16. What are the four materials used to make duct?
40 A
Suction
4
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
17. At what temperature will soft solder melt?
The takeoff fitting
12000
Below 800 degrees F
105 degrees F
18. What are the two functions of the air-conditioning system?
SEER includes the energy used in the start-up and shut-down cycles
To remove humidity and lower dry bulb temperature
With an are rating
When the system is under pressure
19. If pressure rises - what happens to the superheat?
Inclined manometer
It rises
Latent and sensible
A bypass duct or a dump zone
20. Do you need a vent on a push-through evaporator?
40 A
Yes
Yes
105 degrees F
21. How do you calculate ballpark superheat?
100
The takeoff fitting
Subtract ambient temperature from 100
A swaging tool
22. How do you achieve high-efficiency?
45 degrees F
By increasing the surface of the condenser coil
45-55%
ACR (air-conditioning refrigeration) tubing
23. At what temperature will brazing melt?
40 A
It will be low
Duct - electrical - and mechanical
Over 800 degrees F
24. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Over/under and side by side
300
Subtract ambient temperature from 100
A bypass duct or a dump zone
25. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
40 degrees F
A diffuser
A band 4 inches or more in width
26. The fan switch closes at what temperature?
400
140 degrees F
Below 800 degrees F
40 degrees F
27. What distributes supply air to a room in a structure?
Over/under and side by side
140 degrees F
When it is above a conditioned space
A diffuser
28. Do you need a trap on a push-through evaporator?
L-type
Common
Infiltration and ventilation
No
29. What is lined duct?
It also rises
Fiberglass
Duct with insulation on the inside
False
30. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
12000
45-55%
Pi x radius squared
31. What kind of copper tubing is used for plumbing and heating applications?
TXV
It rises
20 degrees above ambient
Nominal-sized tubing
32. Superheat should never be below how many degrees
45 degrees F
Before the vent
5 degrees
18 gauge
33. How is insulation around a duct rated?
The suction line or the low-pressure side
With an are rating
30 A
Subtract ambient temperature from 100
34. 8' round duct has a ballpark cfm of what?
False
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
300
200
35. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
105 degrees F
To lower the amount of pressure drop through the coil
They are larger
6
36. What can cause a decrease in suction pressure on an air-conditioning system?
Duct with insulation on the inside
A dirty evaporator
105 degrees F
25-ft or 50-ft
37. 8' round duct has a ballpark cfm of what?
12000
The takeoff fitting
200
Nitrogen with a small amount of refrigerant
38. How is ACR tubing sized?
Outside diameter (OD)
Average feet per minute X area in square feet (H' x W'/144)
Nitrogen with a small amount of refrigerant
Staples and tape
39. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Positive
They are physically larger
Pi x radius squared
25-ft or 50-ft
40. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
40 degrees F
18 gauge
8-12 degrees F
41. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Heat loss
It will have a decrease in superheat
When it is a pull-through evaporator
Any amount
42. What are the two functions of the air-conditioning system?
Before the vent
They are larger
To remove humidity and lower dry bulb temperature
High
43. How many cfm per ton?
400
30 A
140 degrees F
40 degrees F
44. What are the two types of package units?
Inches of water column (in. WC)
True
Compressor
Side-by-side and over-and-under
45. What are the two types of return air systems in residential installations?
Stranded
It rises
Positive
Individual return air systems and central return air systems
46. How will too much refrigerant effect subcooling?
Staples and tape
It will be high
18 gauge
Yes
47. Do you need a vent on a pull-through evaporator?
In parallel
Common
Yes
Positive
48. What is used to measure static air pressure in ducts.
Stranded
Outside of the male fitting
Inclined manometer
Fiberglass
49. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Belt drive and direct drive
L-type
Duct with insulation on the inside
Vapor
50. Pressure in ductwork is measured In what?
2 minutes
Inches of water column (in. WC)
Negative
A bypass duct or a dump zone
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