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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)
20 degrees F
True
A diffuser
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
2. When do you install a trap on a drain line?
When it is a pull-through evaporator
Outside of the male fitting
Negative
Standard
3. What tool is used to expand the diameter of soft copper tubing
Dehydrated with caps on each end
100
A piston type metering device
A swaging tool
4. 10 SEER is classified as what kind of efficiency?
Belt drive and direct drive
Subtract ambient temperature from 100
When it is a pull-through evaporator
Standard
5. What are normal conditions - as defined by the ARI.
40 degrees F
150
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
300
6. Superheat should never be below how many degrees
False
Negative
2
5 degrees
7. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
They are larger
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Pull a vacuum
8. How much does a drain line need to drop per foot of length?
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9. How are the condenser coils different on a high-efficiency unit?
No
Positive
40 degrees F
They are larger
10. A reciprocating compressor has what sort of moving parts?
Pistons
45-55%
Yes
By increasing the surface of the condenser coil
11. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Yes
TXV
The takeoff fitting
12. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Positive
They are larger
With a minimum of three evenly spaced self-tapping screws
A bypass duct or a dump zone
13. How are round ducts supported?
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14. What tool is used to expand the diameter of soft copper tubing
To lower the amount of pressure drop through the coil
A piston type metering device
105 degrees F
A swaging tool
15. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
6
105 degrees F
With an are rating
16. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
20 A
30 degrees F
Fiberglass
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
17. Superheat should never be below how many degrees
5 degrees
RLA/FLA x 5
In parallel
A bypass duct or a dump zone
18. What are the two basic duct connection configurations for package units supply and return air ducts?
Average feet per minute X area in square feet (H' x W'/144)
4
Positive
Over/under and side by side
19. Which type of wire can handle a higher ampacity?
Stranded
It will have a decrease in superheat
Indoor fan motor - outdoor fan motor - and the compressor
Pi x radius squared
20. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It will be high
Stranded
12000
21. If the rpm's are 3450 - how many poles does the motor have?
SEER includes the energy used in the start-up and shut-down cycles
2
Suction
It rises
22. If the rpm's are 1750 - how many poles does the motor have?
4
The takeoff fitting
Heat load
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
23. What sort of pressure will a push-through evaporator have?
30 degrees F
6
Positive
Potential relay and start capacitor
24. At what temperature will soft solder melt?
Slugging
20 A
They are physically larger
Below 800 degrees F
25. Do you need a vent on a push-through evaporator?
A swaging tool
Yes
The takeoff fitting
They are larger
26. 13 SEER is classified as what kind of efficiency?
Over/under and side by side
100
High
100 psig
27. A reciprocating compressor has what sort of moving parts?
Pistons
1/4'
105 degrees F
8
28. Pressure in ductwork is measured In what?
Nitrogen with a small amount of refrigerant
Duct - electrical - and mechanical
Yes
Inches of water column (in. WC)
29. If the suction pressure rises - what happens to the head pressure?
To remove humidity and lower dry bulb temperature
It also rises
Infiltration and ventilation
20 degrees F
30. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
In series
Boil the liquid refrigerant out ot the oil within the crankcase
To lower the amount of pressure drop through the coil
L-type
31. How many amps can 10 g wire handle?
Inches of water column (in. WC)
It will be high
To lower the amount of pressure drop through the coil
30 A
32. When do you install an auxillary drain pan?
When it is above a conditioned space
Infiltration and ventilation
20 A
It rises
33. How many amps can 8 g wire handle?
Individual return air systems and central return air systems
40 A
Static pressure - velocity pressure - and total pressure
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
34. What gauge is thermostat wire?
18 gauge
Outside of the male fitting
Duct with insulation on the inside
Negative
35. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
40 degrees F
Blended refrigerants
False
36. What are the two types of package units?
Side-by-side and over-and-under
20 A
Pistons
6
37. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
20 degrees above ambient
Yes
It also rises
38. At what temperature does refrigerant condense in a high-efficiency unit?
TXV
Yes
20 degrees above ambient
400
39. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
Slugging
Side-by-side and over-and-under
Slugging
40. How do you calculate the area of a circle?
It will be low
Latent and sensible
Pi x radius squared
Nominal-sized tubing
41. What are the components of a hard-start kit?
30 degrees F
Potential relay and start capacitor
A band 4 inches or more in width
Common
42. If the rpm's are 1050 - how many poles does the motor have?
6
It rises
TXV
No
43. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
It will be high
It will be low
1/4'
Any amount
44. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Blended refrigerants
20 degrees F
To remove humidity and lower dry bulb temperature
140 degrees F
45. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
8-12 degrees F
Outside diameter (OD)
With 4' saddles
46. What kind of refrigeratnts must be added in liquid form?
Positive
They are larger
200
Blended refrigerants
47. In what length rolls is soft copper tubing normally available?
Pull a vacuum
Vapor
25-ft or 50-ft
A swaging tool
48. What do you use to check for leaks?
A piston type metering device
A dirty evaporator
Nitrogen with a small amount of refrigerant
To remove humidity and lower dry bulb temperature
49. What is it called when liquid refrigerant gets into the compressor?
Dehydrated with caps on each end
S-clips and drives (cleats)
Slugging
Positive
50. Which is more efficient - a TXV or a fixed-orifice metering device?
Boil the liquid refrigerant out ot the oil within the crankcase
1/4'
20 degrees above ambient
TXV
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