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. How many amps can 8 g wire handle?
40 A
Below 800 degrees F
Infiltration and ventilation
Yes

2. If the suction pressure rises - what happens to the head pressure?
5 degrees
They are larger
It also rises
TXV

3. Do you need a vent on a pull-through evaporator?
15 A
L-type
Pi x radius squared
Yes

4. What is the name of the fitting where the branch line leaves the duct?
When it is above a conditioned space
S-clips and drives (cleats)
The takeoff fitting
Duct with insulation on the inside

5. How many BTU's per ton?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Nominal-sized tubing
Blended refrigerants
12000

6. 10 SEER is classified as what kind of efficiency?
300
High
Standard
Slugging

7. What can cause a decrease in suction pressure on an air-conditioning system?
Over 800 degrees F
20 A
In parallel
A dirty evaporator

8. The fan switch opens at what temperature?
With an are rating
150
105 degrees F
Outside diameter (OD)

9. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
1/4'
Yes
40 degrees F
8

10. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
2 minutes
They are larger
400

11. How is ACR tubing sized?
Outside diameter (OD)
Potential relay and start capacitor
Static pressure - velocity pressure - and total pressure
30 degrees F

12. Where do you install a trap on a drain line?
Pi x radius squared
With an are rating
Before the vent
Heat loss

13. How is flexible duct supported?
Pull a vacuum
Pull a vacuum
TXV
A band 4 inches or more in width

14. What gauge is thermostat wire?
Yes
Pistons
Standard
18 gauge

15. What distributes supply air to a room in a structure?
Duct - electrical - and mechanical
A diffuser
A swaging tool
15 A

16. How do you calculate ballpark superheat?
Positive
Subtract ambient temperature from 100
Pi x radius squared
30 degrees F

17. What is considered normal operating conditions?
105 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Fiberglass
8-12 degrees F

18. What are the three crafts normally associated with an air-conditioned installation?
True
In series
Duct - electrical - and mechanical
Pi x radius squared

19. What distributes supply air to a room in a structure?
ACR (air-conditioning refrigeration) tubing
The takeoff fitting
Boil the liquid refrigerant out ot the oil within the crankcase
A diffuser

20. The evaporator is designed to remove what two types of heat?
A swaging tool
400
20 degrees F
Latent and sensible

21. Where do you apply flux when soldering?
No
To remove humidity and lower dry bulb temperature
With a minimum of three evenly spaced self-tapping screws
Outside of the male fitting

22. 9' round duct has a ballpark cfm of what?
300
Outside of the male fitting
20 degrees F
40 degrees F

23. The evaporator is designed to remove what two types of heat?
Any amount
8-12 degrees F
Latent and sensible
Suction

24. 10' round duct has a ballpark cfm of what?
Individual return air systems and central return air systems
1/4'
400
30 A

25. At what temperature will brazing melt?
Pi x radius squared
Btu/hr (output) / wattage (input)
Over 800 degrees F
Pull a vacuum

26. What is the range for normal superheat and subcooling?
Over/under and side by side
8-12 degrees F
20 A
6

27. 6' round duct has a ballpark cfm of what?
Negative
30 A
100
Common

28. Do you need a vent on a push-through evaporator?
Inclined manometer
Infiltration and ventilation
Yes
Standard

29. If the rpm's are 3450 - how many poles does the motor have?
Boil the liquid refrigerant out ot the oil within the crankcase
Yes
2
Dehydrated with caps on each end

30. What do you do after you braze a system?
Pull a vacuum
Slugging
On the common terminal
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

31. How many amps can 10 g wire handle?
30-35 degrees above ambient
30 A
140 degrees F
In series

32. 8' round duct has a ballpark cfm of what?
A swaging tool
Yes
200
It also rises

33. The furnace size is calculated by what?
Heat loss
Inside diameter (ID)
40 A
TXV

34. How do you calculate EER?
Btu/hr (output) / wattage (input)
12000
Inside diameter (ID)
400

35. What is the typical pressure differance across a TXV?
100 psig
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes
They are larger

36. What is the difference between SEER and EER?
Pull a vacuum
SEER includes the energy used in the start-up and shut-down cycles
Below 800 degrees F
30 A

37. How are round ducts supported?

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

38. 13 SEER is classified as what kind of efficiency?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
100 psig
High
Latent and sensible

39. At what temperature will soft solder melt?
Subtract ambient temperature from 100
Individual return air systems and central return air systems
Below 800 degrees F
Vapor

40. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Pistons
1/4'
45-55%
Yes

41. How do you calculate the area of a circle?
Heat load
It will be low
Before the vent
Pi x radius squared

42. How will too much refrigerant effect subcooling?
It will be high
True
2 minutes
To lower the amount of pressure drop through the coil

43. Does a package unit come from the factory pre-charged?
Static pressure - velocity pressure - and total pressure
No
Yes
They are physically larger

44. How do you achieve high-efficiency?
105 degrees F
By increasing the surface of the condenser coil
30 A
200

45. What are normal conditions - as defined by the ARI.
When it is a pull-through evaporator
30 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
They are larger

46. What percentage silver do you need to use for an are-410 system?
In parallel
No
Heat loss
15% silphos

47. What are the two types of blower drives?
TXV
Belt drive and direct drive
30 A
Fiberglass

48. 7' round duct has a ballpark cfm of what?
When the system is under pressure
It will have a decrease in superheat
To lower the amount of pressure drop through the coil
150

49. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
105 degrees F
Nominal-sized tubing
30 degrees F
They are physically larger

50. Do you need a vent on a push-through evaporator?
With an are rating
They are larger
Yes
Vapor