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 three ways a motor can fail electrically?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Shorted winding - open winding - and grounded winding
Inside diameter (ID)
They are physically larger

2. Does a package unit come from the factory pre-charged?
Inside diameter (ID)
Over 800 degrees F
Yes
Pistons

3. How are round ducts supported?

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

4. Which type of wire can handle a higher ampacity?
Yes
Btu/hr (output) / wattage (input)
On the common terminal
Stranded

5. How many amps can 12 g wire handle?
140 degrees F
20 A
18 gauge
Inclined manometer

6. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
30 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
It will be low

7. At what temperature will soft solder melt?
Outside diameter (OD)
Below 800 degrees F
TXV
True

8. At what temperature will soft solder melt?
25-ft or 50-ft
Over/under and side by side
Below 800 degrees F
150

9. Do you need a trap on a pull-through evaporator?
40 degrees F
Yes
105 degrees F
TXV

10. When do you install an auxillary drain pan?
A bypass duct or a dump zone
Yes
When it is above a conditioned space
To remove humidity and lower dry bulb temperature

11. At what temperature will brazing melt?
Staples and tape
Over 800 degrees F
Staples and tape
400

12. What are the two types of package units?
When the system is under pressure
Side-by-side and over-and-under
Fiberglass
A piston type metering device

13. How many BTU's per ton?
20 degrees above ambient
Static pressure - velocity pressure - and total pressure
8
12000

14. Where do you install a trap on a drain line?
Btu/hr (output) / wattage (input)
4
Before the vent
20 degrees F

15. The furnace size is calculated by what?
Heat loss
A diffuser
400
With a minimum of three evenly spaced self-tapping screws

16. 8' round duct has a ballpark cfm of what?
200
When it is above a conditioned space
150
Yes

17. What is the name of the fitting where the branch line leaves the duct?
1/4'
Nitrogen with a small amount of refrigerant
When it is a pull-through evaporator
The takeoff fitting

18. How do you calculate LRA?
RLA/FLA x 5
30 degrees F
It also rises
When the system is under pressure

19. What are the three major power-consuming devices on an air-conditioning system?
Any amount
25-ft or 50-ft
With 4' saddles
Indoor fan motor - outdoor fan motor - and the compressor

20. Does a package unit come from the factory pre-charged?
30 degrees F
Rise
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

21. What do you use to check for leaks?
Compressor
To remove humidity and lower dry bulb temperature
Nitrogen with a small amount of refrigerant
Yes

22. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
400
A bypass duct or a dump zone
In series
Btu/hr (output) / wattage (input)

23. At what temperature does refrigerant condense in a standard-efficiency unit?
Inclined manometer
30-35 degrees above ambient
Stranded
Boil the liquid refrigerant out ot the oil within the crankcase

24. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
45-55%
18 gauge
150

25. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
1/4'
20 degrees F
A diffuser

26. What tool is used to expand the diameter of soft copper tubing
Inclined manometer
Inside diameter (ID)
A swaging tool
30 A

27. Do you need a vent on a push-through evaporator?
Yes
2 minutes
Average feet per minute X area in square feet (H' x W'/144)
Static pressure - velocity pressure - and total pressure

28. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
ACR (air-conditioning refrigeration) tubing
True
It rises
Outside of the male fitting

29. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
25-ft or 50-ft
It will be low
The suction line or the low-pressure side
In series

30. What is a package unit?
It will be high
12000
5 degrees
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

31. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
Over 800 degrees F
TXV
False

32. The evaporator is designed to remove what two types of heat?
Latent and sensible
6
A swaging tool
To remove humidity and lower dry bulb temperature

33. If pressure rises - what happens to the superheat?
Rise
Compressor
SEER includes the energy used in the start-up and shut-down cycles
It rises

34. What sort of pressure will a pull-through evaporator have?
400
With an are rating
Inches of water column (in. WC)
Negative

35. What is the difference between SEER and EER?
It will be high
They are physically larger
SEER includes the energy used in the start-up and shut-down cycles
Slugging

36. What kind of metering device do high-efficiency units usually use?
Blended refrigerants
Before the vent
TXV
It will be low

37. If the rpm's are 1750 - how many poles does the motor have?
A swaging tool
RLA/FLA x 5
20 A
4

38. 6' round duct has a ballpark cfm of what?
100
Static pressure - velocity pressure - and total pressure
Any amount
15 A

39. Can refrigerant line sets be altered in length?
The takeoff fitting
Blended refrigerants
Staples and tape
Yes

40. What is the normal evaporator temperature?
Pi x radius squared
Below 800 degrees F
45 degrees F
A piston type metering device

41. What are the three pressures created by moving air in ductwork?
Before the vent
On the common terminal
Static pressure - velocity pressure - and total pressure
4

42. How are round ducts supported?

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

43. How do you calculate cfm?

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

44. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
TXV
They are physically larger
45-55%
20 degrees F

45. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Nitrogen with a small amount of refrigerant
45-55%
Fiberglass
Belt drive and direct drive

46. How many cfm per ton?
Negative
400
Heat load
Individual return air systems and central return air systems

47. What is the typical pressure differance across a TXV?
Blended refrigerants
False
100 psig
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

48. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
They are physically larger
15% silphos
They are larger

49. Where do you apply flux when soldering?
Outside of the male fitting
A band 4 inches or more in width
Any amount
The suction line or the low-pressure side

50. The A/C size is calculated by what?
A band 4 inches or more in width
Outside of the male fitting
Heat load
Slugging