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 sort of pressure will a push-through evaporator have?
Positive
Infiltration and ventilation
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
RLA/FLA x 5

2. How many amps can 10 g wire handle?
Duct with insulation on the inside
With 4' saddles
It will have a decrease in superheat
30 A

3. The fan switch closes at what temperature?
Average feet per minute X area in square feet (H' x W'/144)
True
On the common terminal
140 degrees F

4. Most duct insulation is made of what?
8-12 degrees F
Yes
20 degrees above ambient
Fiberglass

5. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
They are larger
Duct - electrical - and mechanical
2 minutes

6. What percentage silver do you need to use for an are-410 system?
On the common terminal
15% silphos
45-55%
200

7. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
30 degrees F
A piston type metering device
Pi x radius squared
In series

8. How is flexible duct supported?
Slugging
Yes
Dehydrated with caps on each end
A band 4 inches or more in width

9. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Before the vent
In parallel
Staples and tape

10. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
A bypass duct or a dump zone
20 A
To lower the amount of pressure drop through the coil

11. How are round ducts supported?

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

12. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Vapor
It also rises
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
In series

13. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
200
A swaging tool
40 A

14. What type of air conditioning system must be charged using the superheat method?
The suction line or the low-pressure side
2
Fiberglass
A piston type metering device

15. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
To lower the amount of pressure drop through the coil
Staples and tape
Any amount
20 degrees above ambient

16. In what state is the refrigerant in the compressor?
Vapor
Before the vent
False
Pi x radius squared

17. The A/C size is calculated by what?
By increasing the surface of the condenser coil
Heat load
With a minimum of three evenly spaced self-tapping screws
Yes

18. How many amps can 12 g wire handle?
No
20 A
40 degrees F
With a minimum of three evenly spaced self-tapping screws

19. If the rpm's are 3450 - how many poles does the motor have?
2
Negative
Blended refrigerants
Common

20. The fan switch closes at what temperature?
Pull a vacuum
25-ft or 50-ft
A bypass duct or a dump zone
140 degrees F

21. How do you calculate ballpark superheat?
Pistons
No
Subtract ambient temperature from 100
15 A

22. 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

23. What do you use to connect square and rectangular ductboard together?
300
S-clips and drives (cleats)
Standard
On the common terminal

24. What kind of metering device do high-efficiency units usually use?
Fiberglass
To remove humidity and lower dry bulb temperature
TXV
A dirty evaporator

25. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Staples and tape
Latent and sensible
Any amount

26. At what temperature will brazing melt?
200
False
Yes
Over 800 degrees F

27. What sort of pressure will a push-through evaporator have?
300
Outside diameter (OD)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Positive

28. What is considered normal operating conditions?
400
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Average feet per minute X area in square feet (H' x W'/144)
Individual return air systems and central return air systems

29. Superheat should never be below how many degrees
400
A swaging tool
Fiberglass
5 degrees

30. How many BTU's per ton?
Pull a vacuum
12000
False
It also rises

31. Which type of wire can handle a higher ampacity?
300
Stranded
Dehydrated with caps on each end
Subtract ambient temperature from 100

32. What are the two functions of the air-conditioning system?
40 degrees F
To remove humidity and lower dry bulb temperature
Yes
20 A

33. 9' round duct has a ballpark cfm of what?
20 degrees F
300
Over 800 degrees F
Blended refrigerants

34. If the suction pressure rises - what happens to the head pressure?
Inclined manometer
It also rises
Outside diameter (OD)
140 degrees F

35. At what temperature will soft solder melt?
A piston type metering device
Before the vent
Below 800 degrees F
40 degrees F

36. What type of air conditioning system must be charged using the superheat method?
Yes
A piston type metering device
30 degrees F
20 degrees above ambient

37. Which type of wire can handle a higher ampacity?
Boil the liquid refrigerant out ot the oil within the crankcase
They are physically larger
20 degrees F
Stranded

38. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
8
True
Compressor
40 degrees F

39. How is the high pressure switch wired with the low pressure switch?
In parallel
In series
S-clips and drives (cleats)
Blended refrigerants

40. How do you calculate cfm?

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

41. If pressure rises - what happens to the superheat?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It rises
It will be low
Heat loss

42. Which is more efficient - a TXV or a fixed-orifice metering device?
Heat loss
TXV
20 degrees F
It will have a decrease in superheat

43. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Indoor fan motor - outdoor fan motor - and the compressor
L-type
With 4' saddles

44. What kind of copper tubing is used for refrigeration or air-conditioning applications?
To remove humidity and lower dry bulb temperature
With an are rating
High
ACR (air-conditioning refrigeration) tubing

45. How are round ducts connected to one another?
Latent and sensible
15% silphos
With a minimum of three evenly spaced self-tapping screws
Inside diameter (ID)

46. How many cfm per ton?
Yes
Over/under and side by side
Infiltration and ventilation
400

47. The furnace size is calculated by what?
Side-by-side and over-and-under
4
TXV
Heat loss

48. What is the normal evaporator temperature?
Common
Shorted winding - open winding - and grounded winding
45 degrees F
In parallel

49. How is insulation around a duct rated?
1/4'
With an are rating
It will have a decrease in superheat
Yes

50. Where do you apply flux when soldering?
Common
Outside of the male fitting
When it is above a conditioned space
40 A