Test your basic knowledge |

Residential Air Conditioning

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. What are the two types of package units?
Outside diameter (OD)
Nitrogen with a small amount of refrigerant
Side-by-side and over-and-under
12000

2. What are the two ways that fresh air enters a structure?
Average feet per minute X area in square feet (H' x W'/144)
Subtract ambient temperature from 100
Slugging
Infiltration and ventilation

3. Why are some ACR tubing lines insulated?
105 degrees F
With 4' saddles
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
20 degrees above ambient

4. What are the components of a hard-start kit?
Nitrogen with a small amount of refrigerant
With an are rating
6
Potential relay and start capacitor

5. What are the two types of package units?
Rise
45 degrees F
40 A
Side-by-side and over-and-under

6. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
15 A
30-35 degrees above ambient
L-type
In parallel

7. How many amps can 12 g wire handle?
It will be high
It also rises
A piston type metering device
20 A

8. At what temperature will soft solder melt?
Pi x radius squared
Below 800 degrees F
40 degrees F
Nitrogen with a small amount of refrigerant

9. How is insulation around a duct rated?
With an are rating
15% silphos
Duct - electrical - and mechanical
300

10. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Positive
45-55%
With an are rating
Average feet per minute X area in square feet (H' x W'/144)

11. What distributes supply air to a room in a structure?
A diffuser
TXV
Stranded
100 psig

12. Where is insulation used on copper tubing used for air-conditioning?
With an are rating
The suction line or the low-pressure side
They are physically larger
Btu/hr (output) / wattage (input)

13. Do you need a vent on a pull-through evaporator?
RLA/FLA x 5
Common
Blended refrigerants
Yes

14. Sections of duct board can be fastened together with what?
Any amount
Staples and tape
Vapor
Yes

15. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
The takeoff fitting

16. How are the condenser coils different on a high-efficiency unit?
TXV
They are larger
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
105 degrees F

17. 6' round duct has a ballpark cfm of what?
To remove humidity and lower dry bulb temperature
100
45-55%
4

18. 9' round duct has a ballpark cfm of what?
Pi x radius squared
Fiberglass
300
When the system is under pressure

19. How is the high pressure switch wired with the low pressure switch?
When it is a pull-through evaporator
In parallel
With an are rating
Average feet per minute X area in square feet (H' x W'/144)

20. Sections of duct board can be fastened together with what?
Staples and tape
Stranded
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Before the vent

21. The A/C size is calculated by what?
Rise
Heat load
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
No

22. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Fiberglass
Boil the liquid refrigerant out ot the oil within the crankcase
ACR (air-conditioning refrigeration) tubing
SEER includes the energy used in the start-up and shut-down cycles

23. What is a package unit?
True
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
20 degrees F
4

24. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Nominal-sized tubing
5 degrees
In series
20 degrees F

25. How are round ducts connected to one another?
300
Compressor
With a minimum of three evenly spaced self-tapping screws
4

26. 10 SEER is classified as what kind of efficiency?
Standard
20 degrees above ambient
400
8

27. How do you achieve high-efficiency?
False
Positive
Outside of the male fitting
By increasing the surface of the condenser coil

28. How many amps can 10 g wire handle?
150
30 A
Dehydrated with caps on each end
Inclined manometer

29. The load on the evaporater will effect which pressure?
Suction
2 minutes
It also rises
Compressor

30. Does a package unit come from the factory pre-charged?
Yes
Common
100 psig
200

31. The fan switch closes at what temperature?
They are larger
140 degrees F
Nitrogen with a small amount of refrigerant
Fiberglass

32. 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
Nitrogen with a small amount of refrigerant
A piston type metering device

33. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
The suction line or the low-pressure side
40 A
Over 800 degrees F

34. The compressor is cooled by liquid refrigerant. (True of False)
Slugging
140 degrees F
Stranded
False

35. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Outside of the male fitting
In series
100
Boil the liquid refrigerant out ot the oil within the crankcase

36. What is the name of the fitting where the branch line leaves the duct?
Outside of the male fitting
Subtract ambient temperature from 100
15 A
The takeoff fitting

37. What gauge is thermostat wire?
Pistons
18 gauge
Inclined manometer
30 A

38. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
Compressor
False
Blended refrigerants

39. What are the three major power-consuming devices on an air-conditioning system?
Shorted winding - open winding - and grounded winding
100 psig
Indoor fan motor - outdoor fan motor - and the compressor
Latent and sensible

40. How many amps can 14 g wire handle?
When it is above a conditioned space
Dehydrated with caps on each end
Outside of the male fitting
15 A

41. How much does a drain line need to drop per foot of length?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

42. Where do you apply flux when soldering?
5 degrees
18 gauge
Static pressure - velocity pressure - and total pressure
Outside of the male fitting

43. The A/C size is calculated by what?
Yes
Duct - electrical - and mechanical
Individual return air systems and central return air systems
Heat load

44. At what temperature does refrigerant condense in a standard-efficiency unit?
A dirty evaporator
Staples and tape
30-35 degrees above ambient
False

45. Superheat should never be below how many degrees
100 psig
15 A
5 degrees
Blended refrigerants

46. Most duct insulation is made of what?
A piston type metering device
Fiberglass
40 degrees F
20 degrees above ambient

47. If the rpm's are 3450 - how many poles does the motor have?
Yes
30 degrees F
Staples and tape
2

48. If the rpm's are 1750 - how many poles does the motor have?
L-type
40 A
Duct - electrical - and mechanical
4

49. How is the high pressure switch wired with the low pressure switch?
200
Inside diameter (ID)
400
In parallel

50. How many amps can 8 g wire handle?
40 A
Rise
A piston type metering device
A band 4 inches or more in width