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 gauge is thermostat wire?
18 gauge
Outside diameter (OD)
Side-by-side and over-and-under
20 A

2. 10' round duct has a ballpark cfm of what?
400
Vapor
Infiltration and ventilation
It will have a decrease in superheat

3. How will too much refrigerant effect subcooling?
On the common terminal
True
TXV
It will be high

4. A reciprocating compressor has what sort of moving parts?
40 A
Pistons
By increasing the surface of the condenser coil
It will be low

5. How is nominal-sized tubing sized?
8
Common
Static pressure - velocity pressure - and total pressure
Inside diameter (ID)

6. What are the two types of return air systems in residential installations?
The takeoff fitting
With a minimum of three evenly spaced self-tapping screws
2
Individual return air systems and central return air systems

7. If the rpm's are 3450 - how many poles does the motor have?
2
Negative
Heat load
When it is a pull-through evaporator

8. Where do you apply flux when soldering?
200
100 psig
6
Outside of the male fitting

9. The fan switch closes at what temperature?
140 degrees F
Individual return air systems and central return air systems
Over/under and side by side
Yes

10. How many amps can 10 g wire handle?
Over 800 degrees F
Pull a vacuum
It will have a decrease in superheat
30 A

11. What is considered normal operating conditions?
L-type
Belt drive and direct drive
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
TXV

12. The evaporator is designed to remove what two types of heat?
RLA/FLA x 5
It will be low
40 A
Latent and sensible

13. How is ACR tubing sized?
Outside diameter (OD)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
100
Average feet per minute X area in square feet (H' x W'/144)

14. What is the normal evaporator temperature?
Staples and tape
Pistons
Potential relay and start capacitor
45 degrees F

15. How do you calculate LRA?
Staples and tape
40 degrees F
8-12 degrees F
RLA/FLA x 5

16. When do you install an auxillary drain pan?
Yes
When it is above a conditioned space
ACR (air-conditioning refrigeration) tubing
1/4'

17. What are the components of a hard-start kit?
Inches of water column (in. WC)
Over 800 degrees F
Yes
Potential relay and start capacitor

18. 8' round duct has a ballpark cfm of what?
Duct - electrical - and mechanical
In series
High
200

19. What type of air conditioning system must be charged using the superheat method?
45 degrees F
12000
A piston type metering device
Latent and sensible

20. Where do you install a trap on a drain line?
No
Nominal-sized tubing
18 gauge
Before the vent

21. What is the range for normal superheat and subcooling?
8-12 degrees F
Common
Before the vent
The takeoff fitting

22. Will a dirty condenser cause a rise or fall in pressure?
Rise
Compressor
A swaging tool
Yes

23. The compressor is cooled by liquid refrigerant. (True of False)
Potential relay and start capacitor
False
Btu/hr (output) / wattage (input)
Yes

24. At what temperature will brazing melt?
Any amount
RLA/FLA x 5
15% silphos
Over 800 degrees F

25. How do you achieve high-efficiency?
On the common terminal
20 degrees above ambient
By increasing the surface of the condenser coil
They are physically larger

26. The crankcase heater on an air-conditioning compressor is used to what?
Yes
It also rises
Boil the liquid refrigerant out ot the oil within the crankcase
105 degrees F

27. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Stranded
40 A
Dehydrated with caps on each end
Any amount

28. If the rpm's are 1750 - how many poles does the motor have?
Dehydrated with caps on each end
On the common terminal
It will be low
4

29. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
It will be high
100
Positive
20 degrees F

30. How many amps can 14 g wire handle?
15 A
In series
Any amount
In series

31. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
Heat loss
High
Over 800 degrees F

32. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
TXV
Heat load
SEER includes the energy used in the start-up and shut-down cycles

33. How many cfm per ton?
400
Latent and sensible
RLA/FLA x 5
140 degrees F

34. What is lined duct?
Duct with insulation on the inside
Heat loss
SEER includes the energy used in the start-up and shut-down cycles
Infiltration and ventilation

35. How do you calculate EER?
Stranded
Vapor
Nitrogen with a small amount of refrigerant
Btu/hr (output) / wattage (input)

36. What percentage silver do you need to use for an are-410 system?
It will be high
100
TXV
15% silphos

37. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
It will be low
Pi x radius squared
They are larger

38. How many BTU's per ton?
45 degrees F
105 degrees F
12000
L-type

39. How is flexible duct supported?
A band 4 inches or more in width
Yes
Stranded
It also rises

40. What are normal conditions - as defined by the ARI.
Standard
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Latent and sensible
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

41. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
15 A
Shorted winding - open winding - and grounded winding
With 4' saddles

42. At what temperature does refrigerant condense in a standard-efficiency unit?
They are physically larger
30-35 degrees above ambient
Indoor fan motor - outdoor fan motor - and the compressor
TXV

43. What is a package unit?
Pull a vacuum
100
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Belt drive and direct drive

44. How will too much refrigerant effect superheat?
Heat loss
It will be low
40 A
1/4'

45. Will a dirty condenser cause a rise or fall in pressure?
L-type
2
Common
Rise

46. If the rpm's are 750 - how many poles does the motor have?
8
Vapor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Pull a vacuum

47. At what temperature does refrigerant condense in a high-efficiency unit?
Side-by-side and over-and-under
20 degrees above ambient
No
They are larger

48. What is it called when liquid refrigerant gets into the compressor?
Slugging
20 degrees above ambient
Yes
Yes

49. What sort of pressure will a pull-through evaporator have?
Duct - electrical - and mechanical
In series
RLA/FLA x 5
Negative

50. The compressor is cooled by liquid refrigerant. (True of False)
A swaging tool
They are larger
20 A
False