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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 are high-efficiency condenser coils different from standard-efficiency condenser coils?
Any amount
45-55%
They are physically larger
With an are rating
2. If pressure rises - what happens to the superheat?
It will have a decrease in superheat
40 A
It rises
Pull a vacuum
3. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
45 degrees F
140 degrees F
Suction
4. What are the components of a hard-start kit?
In series
Potential relay and start capacitor
Yes
8
5. How long should you leave a system off once you kill power before restarting it?
Boil the liquid refrigerant out ot the oil within the crankcase
Latent and sensible
Pistons
2 minutes
6. What percentage silver do you need to use for an are-410 system?
4
15% silphos
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
40 degrees F
7. How many amps can 14 g wire handle?
100
A bypass duct or a dump zone
15 A
Pistons
8. How are the condenser coils different on a high-efficiency unit?
They are larger
Pi x radius squared
40 degrees F
When it is above a conditioned space
9. What is the range for normal superheat and subcooling?
Duct with insulation on the inside
Inside diameter (ID)
8-12 degrees F
2 minutes
10. How many BTU's per ton?
40 degrees F
L-type
12000
False
11. What do you use to connect square and rectangular ductboard together?
It also rises
S-clips and drives (cleats)
Positive
Nitrogen with a small amount of refrigerant
12. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Fiberglass
Infiltration and ventilation
Stranded
A bypass duct or a dump zone
13. What type of air conditioning system must be charged using the superheat method?
Individual return air systems and central return air systems
In parallel
Nominal-sized tubing
A piston type metering device
14. Will a dirty condenser cause a rise or fall in pressure?
The takeoff fitting
Pi x radius squared
15 A
Rise
15. What do you do after you braze a system?
A diffuser
Any amount
150
Pull a vacuum
16. What sort of pressure will a pull-through evaporator have?
Subtract ambient temperature from 100
Inside diameter (ID)
Negative
On the common terminal
17. If pressure rises - what happens to the superheat?
4
Staples and tape
It rises
Dehydrated with caps on each end
18. How are round ducts supported?
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on line
183
19. 7' round duct has a ballpark cfm of what?
150
18 gauge
Potential relay and start capacitor
Over 800 degrees F
20. What kind of metering device do high-efficiency units usually use?
30 A
Yes
TXV
Yes
21. Superheat should never be below how many degrees
Rise
Compressor
5 degrees
When it is a pull-through evaporator
22. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
It will have a decrease in superheat
To lower the amount of pressure drop through the coil
Belt drive and direct drive
40 degrees F
23. What distributes supply air to a room in a structure?
2 minutes
They are larger
A diffuser
Yes
24. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
18 gauge
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
6
25. At what temperature will brazing melt?
40 degrees F
Over 800 degrees F
15% silphos
Inside diameter (ID)
26. The evaporator is designed to remove what two types of heat?
Heat load
The suction line or the low-pressure side
Latent and sensible
150
27. The fan switch closes at what temperature?
With 4' saddles
300
140 degrees F
2
28. What is it called when liquid refrigerant gets into the compressor?
A diffuser
Slugging
Rise
Yes
29. How many amps can 10 g wire handle?
Common
30 A
A piston type metering device
1/4'
30. Where do you check the amps on a motor?
It will be high
200
Rise
On the common terminal
31. When must a copper joint never be soldered or brazed?
To lower the amount of pressure drop through the coil
When the system is under pressure
RLA/FLA x 5
Latent and sensible
32. How is flexible duct supported?
A band 4 inches or more in width
Rise
20 degrees F
Before the vent
33. The load on the evaporater will effect which pressure?
Suction
200
L-type
Pistons
34. What kind of refrigeratnts must be added in liquid form?
30 A
Blended refrigerants
Latent and sensible
Btu/hr (output) / wattage (input)
35. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
When it is above a conditioned space
True
Heat loss
Positive
36. What are the two types of package units?
1/4'
2 minutes
Side-by-side and over-and-under
Nominal-sized tubing
37. What is the design boiling point for most evaporator coils in residential air conditioning?
It will be high
Blended refrigerants
In series
40 degrees F
38. How many amps can 12 g wire handle?
To remove humidity and lower dry bulb temperature
20 A
It will have a decrease in superheat
30 degrees F
39. Do you need a vent on a push-through evaporator?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
When the system is under pressure
Yes
Rise
40. If the rpm's are 750 - how many poles does the motor have?
8
It will have a decrease in superheat
Blended refrigerants
Yes
41. The fan switch opens at what temperature?
They are larger
105 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pull a vacuum
42. A reciprocating compressor has what sort of moving parts?
Indoor fan motor - outdoor fan motor - and the compressor
Blended refrigerants
12000
Pistons
43. The evaporator is designed to remove what two types of heat?
Positive
Pi x radius squared
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Latent and sensible
44. Will a dirty condenser cause a rise or fall in pressure?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Standard
30 A
Rise
45. How do you calculate EER?
Btu/hr (output) / wattage (input)
Yes
1/4'
100 psig
46. What are the four materials used to make duct?
Blended refrigerants
18 gauge
With 4' saddles
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
47. 6' round duct has a ballpark cfm of what?
20 degrees above ambient
100
Btu/hr (output) / wattage (input)
In series
48. When do you install an auxillary drain pan?
When it is above a conditioned space
8
In series
It also rises
49. Where do you check the amps on a motor?
On the common terminal
100
Subtract ambient temperature from 100
150
50. The A/C size is calculated by what?
True
Heat load
20 degrees F
The takeoff fitting