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. Do you need a trap on a pull-through evaporator?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Before the vent
Yes
Belt drive and direct drive

2. The load on the evaporater will effect which pressure?
Suction
Indoor fan motor - outdoor fan motor - and the compressor
400
400

3. What kind of refrigeratnts must be added in liquid form?
A swaging tool
Blended refrigerants
300
45 degrees F

4. Why are some ACR tubing lines insulated?
Individual return air systems and central return air systems
It will be high
Pull a vacuum
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

5. 9' round duct has a ballpark cfm of what?
When it is above a conditioned space
The takeoff fitting
300
Outside of the male fitting

6. How do you calculate cfm?

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7. What type of air conditioning system must be charged using the superheat method?
RLA/FLA x 5
A piston type metering device
Blended refrigerants
Any amount

8. Superheat should never be below how many degrees
Pistons
Pi x radius squared
5 degrees
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

9. How do you calculate cfm?

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10. The compressor is cooled by liquid refrigerant. (True of False)
A swaging tool
12000
It rises
False

11. 6' round duct has a ballpark cfm of what?
Below 800 degrees F
Over 800 degrees F
Common
100

12. What sort of pressure will a pull-through evaporator have?
TXV
It will be low
Staples and tape
Negative

13. What kind of refrigeratnts must be added in liquid form?
In series
400
25-ft or 50-ft
Blended refrigerants

14. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
In parallel
On the common terminal
With an are rating

15. How will too much refrigerant effect subcooling?
To remove humidity and lower dry bulb temperature
It will be high
Over 800 degrees F
They are larger

16. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Common
A bypass duct or a dump zone
Shorted winding - open winding - and grounded winding
To lower the amount of pressure drop through the coil

17. What are the two ways that fresh air enters a structure?
100 psig
Stranded
Infiltration and ventilation
5 degrees

18. What tool is used to expand the diameter of soft copper tubing
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Below 800 degrees F
When it is above a conditioned space
A swaging tool

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

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20. What sort of pressure will a push-through evaporator have?
Positive
It will be high
20 A
15% silphos

21. How do you calculate LRA?
Inside diameter (ID)
Boil the liquid refrigerant out ot the oil within the crankcase
RLA/FLA x 5
Vapor

22. What do you use to check for leaks?
400
Potential relay and start capacitor
Shorted winding - open winding - and grounded winding
Nitrogen with a small amount of refrigerant

23. How are round ducts connected to one another?
True
ACR (air-conditioning refrigeration) tubing
With a minimum of three evenly spaced self-tapping screws
2 minutes

24. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Yes
150
20 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

25. If the rpm's are 1750 - how many poles does the motor have?
It will be low
4
400
6

26. When do you install an auxillary drain pan?
Before the vent
When it is above a conditioned space
Pi x radius squared
Pull a vacuum

27. How long should you leave a system off once you kill power before restarting it?
High
100 psig
150
2 minutes

28. The evaporator is designed to remove what two types of heat?
Latent and sensible
L-type
8
Shorted winding - open winding - and grounded winding

29. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
4
20 degrees F
8-12 degrees F

30. The fan switch opens at what temperature?
105 degrees F
Outside of the male fitting
A dirty evaporator
Latent and sensible

31. 10' round duct has a ballpark cfm of what?
Average feet per minute X area in square feet (H' x W'/144)
It also rises
400
True

32. How is insulation around a duct rated?
Boil the liquid refrigerant out ot the oil within the crankcase
With an are rating
False
Any amount

33. What are the two types of package units?
30 A
SEER includes the energy used in the start-up and shut-down cycles
Side-by-side and over-and-under
To remove humidity and lower dry bulb temperature

34. How does ACR copper pipe come?
300
Dehydrated with caps on each end
A dirty evaporator
With an are rating

35. Where do you apply flux when soldering?
30 A
Outside of the male fitting
It will be low
It will have a decrease in superheat

36. What is the normal evaporator temperature?
Blended refrigerants
105 degrees F
45 degrees F
8

37. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
Dehydrated with caps on each end
2 minutes
The takeoff fitting

38. 10' round duct has a ballpark cfm of what?
When it is above a conditioned space
150
Rise
400

39. Sections of duct board can be fastened together with what?
Below 800 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
A bypass duct or a dump zone
Staples and tape

40. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
6
Nominal-sized tubing
On the common terminal

41. Why are some ACR tubing lines insulated?
100 psig
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
5 degrees
Negative

42. At what temperature will soft solder melt?
40 degrees F
Average feet per minute X area in square feet (H' x W'/144)
Yes
Below 800 degrees F

43. What can cause a decrease in suction pressure on an air-conditioning system?
Inside diameter (ID)
In parallel
A dirty evaporator
To remove humidity and lower dry bulb temperature

44. If pressure rises - what happens to the superheat?
400
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It rises
20 degrees above ambient

45. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
15 A
40 A
No

46. What is the range for normal superheat and subcooling?
400
To remove humidity and lower dry bulb temperature
Outside of the male fitting
8-12 degrees F

47. When do you install a trap on a drain line?
Static pressure - velocity pressure - and total pressure
When it is a pull-through evaporator
Yes
40 A

48. Which type of wire can handle a higher ampacity?
Slugging
1/4'
Stranded
Duct - electrical - and mechanical

49. How do you calculate ballpark superheat?
Negative
No
Subtract ambient temperature from 100
To remove humidity and lower dry bulb temperature

50. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Average feet per minute X area in square feet (H' x W'/144)
Dehydrated with caps on each end
Side-by-side and over-and-under