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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. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Yes
300
True
Outside diameter (OD)
2. The furnace size is calculated by what?
Inches of water column (in. WC)
S-clips and drives (cleats)
A diffuser
Heat loss
3. A reciprocating compressor has what sort of moving parts?
TXV
Pistons
30 A
False
4. At what temperature does refrigerant condense in a high-efficiency unit?
In series
8-12 degrees F
20 degrees above ambient
RLA/FLA x 5
5. If the rpm's are 3450 - how many poles does the motor have?
Yes
2
20 degrees F
Vapor
6. What are the two ways that fresh air enters a structure?
S-clips and drives (cleats)
TXV
It also rises
Infiltration and ventilation
7. Which is more efficient - a TXV or a fixed-orifice metering device?
Inclined manometer
40 degrees F
20 degrees above ambient
TXV
8. How do you calculate EER?
No
Btu/hr (output) / wattage (input)
It also rises
105 degrees F
9. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
2 minutes
True
Any amount
2
10. What kind of refrigeratnts must be added in liquid form?
5 degrees
When it is a pull-through evaporator
Suction
Blended refrigerants
11. Sections of duct board can be fastened together with what?
True
Subtract ambient temperature from 100
Staples and tape
When it is above a conditioned space
12. What do you do after you braze a system?
20 degrees above ambient
Pull a vacuum
30-35 degrees above ambient
140 degrees F
13. On what terminal do you check amperage?
Common
Vapor
Pistons
8
14. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
Fiberglass
Rise
When it is above a conditioned space
15. Do you need a trap on a pull-through evaporator?
Staples and tape
150
They are physically larger
Yes
16. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Dehydrated with caps on each end
L-type
300
Shorted winding - open winding - and grounded winding
17. What are the components of a hard-start kit?
Inclined manometer
Belt drive and direct drive
Potential relay and start capacitor
20 degrees above ambient
18. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Yes
A dirty evaporator
8-12 degrees F
19. How many BTU's per ton?
L-type
8
12000
A swaging tool
20. How is the high pressure switch wired with the low pressure switch?
A swaging tool
With 4' saddles
In parallel
With an are rating
21. Does a package unit come from the factory pre-charged?
A dirty evaporator
Yes
Over/under and side by side
Pull a vacuum
22. What are the two types of blower drives?
Heat loss
Belt drive and direct drive
Heat loss
6
23. What can cause a decrease in suction pressure on an air-conditioning system?
SEER includes the energy used in the start-up and shut-down cycles
Yes
A dirty evaporator
400
24. Where do you check the amps on a motor?
Over 800 degrees F
To lower the amount of pressure drop through the coil
On the common terminal
45 degrees F
25. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
Heat load
30 A
200
26. How do you calculate cfm?
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27. When do you install a trap on a drain line?
On the common terminal
15 A
Negative
When it is a pull-through evaporator
28. What are the three major power-consuming devices on an air-conditioning system?
8-12 degrees F
40 degrees F
Yes
Indoor fan motor - outdoor fan motor - and the compressor
29. What distributes supply air to a room in a structure?
20 degrees F
18 gauge
Latent and sensible
A diffuser
30. What are the components of a hard-start kit?
Indoor fan motor - outdoor fan motor - and the compressor
By increasing the surface of the condenser coil
Potential relay and start capacitor
No
31. Superheat should never be below how many degrees
5 degrees
Average feet per minute X area in square feet (H' x W'/144)
45-55%
Inclined manometer
32. How do you calculate cfm?
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33. 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
105 degrees F
Yes
It will have a decrease in superheat
34. How does ACR copper pipe come?
They are larger
Dehydrated with caps on each end
Blended refrigerants
Staples and tape
35. If the rpm's are 3450 - how many poles does the motor have?
2
Suction
Duct - electrical - and mechanical
A bypass duct or a dump zone
36. How many amps can 10 g wire handle?
40 degrees F
30 A
400
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
37. How is the high pressure switch wired with the low pressure switch?
In parallel
Individual return air systems and central return air systems
It rises
To remove humidity and lower dry bulb temperature
38. How are round ducts supported?
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39. The fan switch opens at what temperature?
30 degrees F
105 degrees F
Nitrogen with a small amount of refrigerant
20 degrees above ambient
40. When do you install a trap on a drain line?
When it is a pull-through evaporator
They are physically larger
High
30 degrees F
41. The fan switch closes at what temperature?
A diffuser
400
400
140 degrees F
42. What is the typical pressure differance across a TXV?
Common
With a minimum of three evenly spaced self-tapping screws
100 psig
S-clips and drives (cleats)
43. How long should you leave a system off once you kill power before restarting it?
Latent and sensible
Static pressure - velocity pressure - and total pressure
2 minutes
30-35 degrees above ambient
44. What gauge is thermostat wire?
18 gauge
Blended refrigerants
Boil the liquid refrigerant out ot the oil within the crankcase
It will have a decrease in superheat
45. 6' round duct has a ballpark cfm of what?
100
Nominal-sized tubing
40 degrees F
A band 4 inches or more in width
46. The evaporator is designed to remove what two types of heat?
25-ft or 50-ft
Blended refrigerants
Inches of water column (in. WC)
Latent and sensible
47. In what state is the refrigerant in the compressor?
40 degrees F
TXV
Vapor
Btu/hr (output) / wattage (input)
48. Do you need a trap on a pull-through evaporator?
Below 800 degrees F
Belt drive and direct drive
Duct - electrical - and mechanical
Yes
49. Most duct insulation is made of what?
A dirty evaporator
True
Fiberglass
ACR (air-conditioning refrigeration) tubing
50. How do you calculate LRA?
Positive
4
Over 800 degrees F
RLA/FLA x 5
Sorry!:) No result found.
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