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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. At what temperature does refrigerant condense in a high-efficiency unit?
Duct - electrical - and mechanical
Inclined manometer
Outside of the male fitting
20 degrees above ambient
2. How do you calculate cfm?
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183
3. What type of air conditioning system must be charged using the superheat method?
Staples and tape
Common
No
A piston type metering device
4. How many cfm per ton?
400
High
On the common terminal
Outside diameter (OD)
5. How is ACR tubing sized?
Heat load
Outside diameter (OD)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
TXV
6. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Belt drive and direct drive
True
Boil the liquid refrigerant out ot the oil within the crankcase
Pistons
7. How many amps can 10 g wire handle?
30 A
25-ft or 50-ft
When it is above a conditioned space
Suction
8. What are the three crafts normally associated with an air-conditioned installation?
Vapor
Duct - electrical - and mechanical
100
High
9. The load on the evaporater will effect which pressure?
Boil the liquid refrigerant out ot the oil within the crankcase
Suction
It will have a decrease in superheat
Blended refrigerants
10. How many amps can 12 g wire handle?
In series
20 A
12000
5 degrees
11. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
Static pressure - velocity pressure - and total pressure
It also rises
False
12. In what state is the refrigerant in the compressor?
Pi x radius squared
40 A
Inside diameter (ID)
Vapor
13. Does a package unit come from the factory pre-charged?
Over/under and side by side
Yes
Over 800 degrees F
A swaging tool
14. How do you calculate the area of a circle?
Yes
Pi x radius squared
Heat loss
Fiberglass
15. In what state is the refrigerant in the compressor?
It will be high
Yes
Outside diameter (OD)
Vapor
16. What component changes refrigerant from a low pressure gas to a high pressure gas?
TXV
Latent and sensible
When it is above a conditioned space
Compressor
17. The evaporator is designed to remove what two types of heat?
Indoor fan motor - outdoor fan motor - and the compressor
When it is above a conditioned space
It will have a decrease in superheat
Latent and sensible
18. At what temperature does refrigerant condense in a standard-efficiency unit?
Blended refrigerants
Average feet per minute X area in square feet (H' x W'/144)
Static pressure - velocity pressure - and total pressure
30-35 degrees above ambient
19. How is nominal-sized tubing sized?
45-55%
1/4'
Inside diameter (ID)
2 minutes
20. 13 SEER is classified as what kind of efficiency?
They are physically larger
High
When it is a pull-through evaporator
Blended refrigerants
21. When do you install an auxillary drain pan?
Latent and sensible
40 degrees F
When it is above a conditioned space
Btu/hr (output) / wattage (input)
22. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
6
18 gauge
20 degrees F
Shorted winding - open winding - and grounded winding
23. What percentage silver do you need to use for an are-410 system?
45-55%
15% silphos
400
Compressor
24. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
On the common terminal
Static pressure - velocity pressure - and total pressure
400
25. Superheat should never be below how many degrees
30 A
18 gauge
Below 800 degrees F
5 degrees
26. What kind of metering device do high-efficiency units usually use?
Suction
20 degrees above ambient
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
TXV
27. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Indoor fan motor - outdoor fan motor - and the compressor
When it is a pull-through evaporator
40 A
28. What is the name of the fitting where the branch line leaves the duct?
No
6
The takeoff fitting
With an are rating
29. If the suction pressure rises - what happens to the head pressure?
It also rises
12000
Btu/hr (output) / wattage (input)
ACR (air-conditioning refrigeration) tubing
30. What is the design boiling point for most evaporator coils in residential air conditioning?
200
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
40 degrees F
It will have a decrease in superheat
31. The crankcase heater on an air-conditioning compressor is used to what?
Outside of the male fitting
Boil the liquid refrigerant out ot the oil within the crankcase
Inside diameter (ID)
It rises
32. The compressor is cooled by liquid refrigerant. (True of False)
Boil the liquid refrigerant out ot the oil within the crankcase
400
False
Latent and sensible
33. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
Standard
300
20 A
34. If pressure rises - what happens to the superheat?
When it is a pull-through evaporator
15% silphos
It rises
Individual return air systems and central return air systems
35. What is used to measure static air pressure in ducts.
25-ft or 50-ft
Inclined manometer
True
It will have a decrease in superheat
36. What is the typical pressure differance across a TXV?
2 minutes
40 degrees F
25-ft or 50-ft
100 psig
37. If the rpm's are 1050 - how many poles does the motor have?
Standard
It also rises
6
Vapor
38. 8' round duct has a ballpark cfm of what?
Yes
Subtract ambient temperature from 100
Yes
200
39. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
Over 800 degrees F
Positive
No
40. 7' round duct has a ballpark cfm of what?
They are physically larger
Yes
Latent and sensible
150
41. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Rise
Individual return air systems and central return air systems
Outside diameter (OD)
42. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
150
A bypass duct or a dump zone
Blended refrigerants
In series
43. Where do you install a trap on a drain line?
12000
Positive
Before the vent
25-ft or 50-ft
44. How do you calculate EER?
Duct - electrical - and mechanical
Btu/hr (output) / wattage (input)
Below 800 degrees F
High
45. 8' round duct has a ballpark cfm of what?
20 A
200
In parallel
Outside diameter (OD)
46. 6' round duct has a ballpark cfm of what?
40 A
100
Outside of the male fitting
Pistons
47. How many amps can 10 g wire handle?
A band 4 inches or more in width
300
Before the vent
30 A
48. How do you calculate EER?
2 minutes
Btu/hr (output) / wattage (input)
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Yes
49. Do you need a vent on a push-through evaporator?
They are physically larger
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Pull a vacuum
Yes
50. What kind of metering device do high-efficiency units usually use?
20 A
TXV
Pi x radius squared
Positive