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. The compressor is cooled by liquid refrigerant. (True of False)
Any amount
Over 800 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
False

2. What kind of refrigeratnts must be added in liquid form?
In parallel
Blended refrigerants
Side-by-side and over-and-under
L-type

3. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Boil the liquid refrigerant out ot the oil within the crankcase
Slugging
30-35 degrees above ambient

4. What are the components of a hard-start kit?
15 A
Potential relay and start capacitor
With a minimum of three evenly spaced self-tapping screws
They are physically larger

5. How are the condenser coils different on a high-efficiency unit?
They are larger
The suction line or the low-pressure side
On the common terminal
Fiberglass

6. What is a package unit?
Potential relay and start capacitor
400
A swaging tool
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

7. Where is insulation used on copper tubing used for air-conditioning?
40 degrees F
Side-by-side and over-and-under
Negative
The suction line or the low-pressure side

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

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9. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
40 degrees F
Potential relay and start capacitor
A diffuser

10. The fan switch closes at what temperature?
To lower the amount of pressure drop through the coil
400
140 degrees F
By increasing the surface of the condenser coil

11. When do you install an auxillary drain pan?
Btu/hr (output) / wattage (input)
When it is above a conditioned space
It will be low
A band 4 inches or more in width

12. What are the two ways that fresh air enters a structure?
Heat loss
Stranded
A band 4 inches or more in width
Infiltration and ventilation

13. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
20 degrees above ambient
A swaging tool
They are physically larger

14. On what terminal do you check amperage?
4
Common
Positive
Inclined manometer

15. How will too much refrigerant effect superheat?
Btu/hr (output) / wattage (input)
Over 800 degrees F
It will be low
Inside diameter (ID)

16. When must a copper joint never be soldered or brazed?
Yes
When the system is under pressure
S-clips and drives (cleats)
True

17. Where is insulation used on copper tubing used for air-conditioning?
Yes
6
Static pressure - velocity pressure - and total pressure
The suction line or the low-pressure side

18. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
The suction line or the low-pressure side
Side-by-side and over-and-under
Below 800 degrees F

19. The crankcase heater on an air-conditioning compressor is used to what?
Latent and sensible
TXV
30 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase

20. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
30 degrees F
To remove humidity and lower dry bulb temperature
It will be high

21. How are round ducts supported?

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22. How many amps can 10 g wire handle?
20 degrees F
When the system is under pressure
40 A
30 A

23. What distributes supply air to a room in a structure?
Any amount
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A diffuser
S-clips and drives (cleats)

24. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Potential relay and start capacitor
With 4' saddles
Standard

25. How many amps can 10 g wire handle?
8-12 degrees F
30 A
Yes
15% silphos

26. How do you calculate EER?
To lower the amount of pressure drop through the coil
Btu/hr (output) / wattage (input)
2
Over 800 degrees F

27. Pressure in ductwork is measured In what?
It will be high
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Inches of water column (in. WC)
It will be low

28. Which type of wire can handle a higher ampacity?
High
Stranded
On the common terminal
Standard

29. What do you do after you braze a system?
Pull a vacuum
5 degrees
Blended refrigerants
20 degrees F

30. At what temperature does refrigerant condense in a standard-efficiency unit?
105 degrees F
It also rises
Yes
30-35 degrees above ambient

31. A reciprocating compressor has what sort of moving parts?
Inclined manometer
30 degrees F
Pistons
The suction line or the low-pressure side

32. What is the normal evaporator temperature?
Blended refrigerants
Subtract ambient temperature from 100
45 degrees F
Outside diameter (OD)

33. What sort of pressure will a push-through evaporator have?
On the common terminal
Positive
Potential relay and start capacitor
In series

34. How do you calculate LRA?
RLA/FLA x 5
Latent and sensible
150
Any amount

35. Does a package unit come from the factory pre-charged?
20 A
In parallel
Yes
A swaging tool

36. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
1/4'
Over 800 degrees F
30 degrees F
Blended refrigerants

37. What can cause a decrease in suction pressure on an air-conditioning system?
Dehydrated with caps on each end
Latent and sensible
A dirty evaporator
Suction

38. Where do you apply flux when soldering?
Latent and sensible
TXV
Outside of the male fitting
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

39. Does a package unit come from the factory pre-charged?
Compressor
200
With an are rating
Yes

40. 6' round duct has a ballpark cfm of what?
With a minimum of three evenly spaced self-tapping screws
TXV
Average feet per minute X area in square feet (H' x W'/144)
100

41. What is the design boiling point for most evaporator coils in residential air conditioning?
Yes
Duct - electrical - and mechanical
100 psig
40 degrees F

42. Can refrigerant line sets be altered in length?
Yes
Outside diameter (OD)
100
Rise

43. At what temperature will soft solder melt?
No
Btu/hr (output) / wattage (input)
Below 800 degrees F
Suction

44. 9' round duct has a ballpark cfm of what?
When it is a pull-through evaporator
300
Negative
40 A

45. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
Individual return air systems and central return air systems
2 minutes
45 degrees F

46. If the rpm's are 750 - how many poles does the motor have?
8
40 degrees F
Infiltration and ventilation
In series

47. 10' round duct has a ballpark cfm of what?
400
RLA/FLA x 5
Outside diameter (OD)
Btu/hr (output) / wattage (input)

48. Which is more efficient - a TXV or a fixed-orifice metering device?
It will be high
TXV
The suction line or the low-pressure side
Heat loss

49. If the rpm's are 1050 - how many poles does the motor have?
Btu/hr (output) / wattage (input)
6
Inside diameter (ID)
Before the vent

50. How do you achieve high-efficiency?
Pull a vacuum
Slugging
By increasing the surface of the condenser coil
Common