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. At what temperature will soft solder melt?
Below 800 degrees F
Pistons
20 degrees above ambient
30-35 degrees above ambient

2. What gauge is thermostat wire?
45-55%
18 gauge
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Before the vent

3. The fan switch closes at what temperature?
140 degrees F
400
Yes
Average feet per minute X area in square feet (H' x W'/144)

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

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5. What are normal conditions - as defined by the ARI.
30 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Over/under and side by side
Indoor fan motor - outdoor fan motor - and the compressor

6. Will a dirty condenser cause a rise or fall in pressure?
Pistons
Rise
Any amount
12000

7. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
Outside diameter (OD)
Over/under and side by side
18 gauge

8. How long should you leave a system off once you kill power before restarting it?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
40 degrees F
Yes
2 minutes

9. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
Side-by-side and over-and-under
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
5 degrees

10. How do you calculate the area of a circle?
In series
Static pressure - velocity pressure - and total pressure
Pi x radius squared
Slugging

11. Most duct insulation is made of what?
Fiberglass
In series
A dirty evaporator
Inclined manometer

12. Where do you apply flux when soldering?
Outside of the male fitting
Inclined manometer
100
Common

13. The furnace size is calculated by what?
A band 4 inches or more in width
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Heat loss
With an are rating

14. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Positive
When it is above a conditioned space
Individual return air systems and central return air systems

15. What is a package unit?
When it is above a conditioned space
S-clips and drives (cleats)
40 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

16. Sections of duct board can be fastened together with what?
8
4
Staples and tape
Duct with insulation on the inside

17. How many cfm per ton?
400
2 minutes
By increasing the surface of the condenser coil
Dehydrated with caps on each end

18. What are the four materials used to make duct?
Boil the liquid refrigerant out ot the oil within the crankcase
Pi x radius squared
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Dehydrated with caps on each end

19. What are the three crafts normally associated with an air-conditioned installation?
Yes
Duct - electrical - and mechanical
A bypass duct or a dump zone
8-12 degrees F

20. When do you install an auxillary drain pan?
When it is above a conditioned space
Stranded
Shorted winding - open winding - and grounded winding
TXV

21. How many amps can 14 g wire handle?
Nitrogen with a small amount of refrigerant
Over 800 degrees F
15 A
A swaging tool

22. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Blended refrigerants
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
40 degrees F
45 degrees F

23. The evaporator is designed to remove what two types of heat?
400
8
SEER includes the energy used in the start-up and shut-down cycles
Latent and sensible

24. What is the design boiling point for most evaporator coils in residential air conditioning?
In parallel
Vapor
40 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

25. How are round ducts connected to one another?
TXV
5 degrees
With a minimum of three evenly spaced self-tapping screws
Infiltration and ventilation

26. What is it called when liquid refrigerant gets into the compressor?
It will be high
40 degrees F
Slugging
False

27. What kind of copper tubing is used for plumbing and heating applications?
12000
Nominal-sized tubing
It rises
Yes

28. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
2
They are physically larger
Dehydrated with caps on each end
Staples and tape

29. What kind of copper tubing is used for refrigeration or air-conditioning applications?
140 degrees F
ACR (air-conditioning refrigeration) tubing
On the common terminal
Latent and sensible

30. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
TXV
2 minutes
400

31. Does a package unit come from the factory pre-charged?
Pistons
Yes
A dirty evaporator
Average feet per minute X area in square feet (H' x W'/144)

32. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
Subtract ambient temperature from 100
The suction line or the low-pressure side
40 degrees F

33. What sort of pressure will a push-through evaporator have?
Positive
ACR (air-conditioning refrigeration) tubing
Standard
Compressor

34. Superheat should never be below how many degrees
5 degrees
1/4'
300
In parallel

35. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
40 degrees F
20 degrees F
The suction line or the low-pressure side

36. Which is more efficient - a TXV or a fixed-orifice metering device?
6
TXV
ACR (air-conditioning refrigeration) tubing
On the common terminal

37. What do you do after you braze a system?
A piston type metering device
2
150
Pull a vacuum

38. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
45-55%
It will have a decrease in superheat
15 A
30 degrees F

39. If the suction pressure rises - what happens to the head pressure?
It also rises
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
The takeoff fitting
Yes

40. If pressure rises - what happens to the superheat?
It rises
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
A swaging tool
Btu/hr (output) / wattage (input)

41. How are round ducts connected to one another?
Outside of the male fitting
Slugging
The suction line or the low-pressure side
With a minimum of three evenly spaced self-tapping screws

42. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
In series
45 degrees F
They are physically larger
It will have a decrease in superheat

43. How do you calculate LRA?
Pull a vacuum
140 degrees F
RLA/FLA x 5
100

44. How does ACR copper pipe come?
1/4'
Dehydrated with caps on each end
Individual return air systems and central return air systems
By increasing the surface of the condenser coil

45. How many amps can 10 g wire handle?
30 A
The takeoff fitting
30 degrees F
12000

46. 8' round duct has a ballpark cfm of what?
It will be low
100 psig
200
It rises

47. The fan switch opens at what temperature?
Inclined manometer
6
105 degrees F
Fiberglass

48. What are the two ways that fresh air enters a structure?
Negative
They are larger
A dirty evaporator
Infiltration and ventilation

49. Where do you check the amps on a motor?
With a minimum of three evenly spaced self-tapping screws
On the common terminal
To lower the amount of pressure drop through the coil
40 A

50. What are the components of a hard-start kit?
Heat loss
Potential relay and start capacitor
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It rises