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
Side-by-side and over-and-under
Potential relay and start capacitor
150

2. The fan switch opens at what temperature?
30 degrees F
Duct - electrical - and mechanical
105 degrees F
In series

3. How long should you leave a system off once you kill power before restarting it?
With 4' saddles
Below 800 degrees F
30-35 degrees above ambient
2 minutes

4. When do you install an auxillary drain pan?
When it is above a conditioned space
Average feet per minute X area in square feet (H' x W'/144)
Yes
ACR (air-conditioning refrigeration) tubing

5. How is flexible duct supported?
Nominal-sized tubing
A band 4 inches or more in width
100 psig
Inside diameter (ID)

6. How do you calculate ballpark superheat?
Outside diameter (OD)
Yes
Subtract ambient temperature from 100
Belt drive and direct drive

7. 6' round duct has a ballpark cfm of what?
They are physically larger
45 degrees F
With an are rating
100

8. How many BTU's per ton?
Suction
Belt drive and direct drive
45-55%
12000

9. When must a copper joint never be soldered or brazed?
400
Vapor
With 4' saddles
When the system is under pressure

10. How are round ducts connected to one another?
Suction
With a minimum of three evenly spaced self-tapping screws
A bypass duct or a dump zone
S-clips and drives (cleats)

11. The fan switch closes at what temperature?
140 degrees F
150
Static pressure - velocity pressure - and total pressure
45 degrees F

12. What is considered normal operating conditions?
Yes
5 degrees
Side-by-side and over-and-under
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

13. What is it called when liquid refrigerant gets into the compressor?
300
Slugging
Duct with insulation on the inside
TXV

14. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Over 800 degrees F
Inclined manometer
20 degrees F
25-ft or 50-ft

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

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16. If pressure rises - what happens to the superheat?
The suction line or the low-pressure side
Common
It rises
It also rises

17. At what temperature will soft solder melt?
It also rises
Suction
Below 800 degrees F
TXV

18. How will too much refrigerant effect subcooling?
They are physically larger
1/4'
It will be high
30-35 degrees above ambient

19. Do you need a vent on a push-through evaporator?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Latent and sensible
They are larger
Yes

20. In what state is the refrigerant in the compressor?
Vapor
L-type
Pi x radius squared
100 psig

21. How do you calculate LRA?
RLA/FLA x 5
45-55%
Stranded
With 4' saddles

22. Most duct insulation is made of what?
Fiberglass
It will have a decrease in superheat
To remove humidity and lower dry bulb temperature
S-clips and drives (cleats)

23. 7' round duct has a ballpark cfm of what?
High
True
150
Staples and tape

24. 9' round duct has a ballpark cfm of what?
8-12 degrees F
300
30 A
Pull a vacuum

25. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Outside of the male fitting
400
A piston type metering device

26. If pressure rises - what happens to the superheat?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws
Any amount
It rises

27. At what temperature will brazing melt?
40 degrees F
Over 800 degrees F
Compressor
Side-by-side and over-and-under

28. What is lined duct?
Duct with insulation on the inside
By increasing the surface of the condenser coil
18 gauge
When it is a pull-through evaporator

29. Can refrigerant line sets be altered in length?
Blended refrigerants
Potential relay and start capacitor
400
Yes

30. What are the three pressures created by moving air in ductwork?
A bypass duct or a dump zone
8
140 degrees F
Static pressure - velocity pressure - and total pressure

31. A reciprocating compressor has what sort of moving parts?
L-type
On the common terminal
Pistons
Yes

32. Sections of duct board can be fastened together with what?
S-clips and drives (cleats)
40 degrees F
Staples and tape
Positive

33. What gauge is thermostat wire?
18 gauge
2
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
No

34. If the rpm's are 1750 - how many poles does the motor have?
SEER includes the energy used in the start-up and shut-down cycles
30 A
Any amount
4

35. What do you do after you braze a system?
By increasing the surface of the condenser coil
Pull a vacuum
Compressor
No

36. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
RLA/FLA x 5
Stranded
Indoor fan motor - outdoor fan motor - and the compressor

37. What kind of refrigeratnts must be added in liquid form?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
The suction line or the low-pressure side
Blended refrigerants
Pi x radius squared

38. If the rpm's are 1050 - how many poles does the motor have?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
20 A
Common
6

39. Does a package unit come from the factory pre-charged?
High
Yes
With 4' saddles
Heat loss

40. What are the three crafts normally associated with an air-conditioned installation?
TXV
Heat loss
Duct - electrical - and mechanical
With 4' saddles

41. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
2
Indoor fan motor - outdoor fan motor - and the compressor
It rises

42. In what length rolls is soft copper tubing normally available?
A piston type metering device
25-ft or 50-ft
With an are rating
Belt drive and direct drive

43. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Outside of the male fitting
Duct with insulation on the inside
L-type

44. If the rpm's are 1750 - how many poles does the motor have?
Before the vent
Pistons
4
Nitrogen with a small amount of refrigerant

45. What kind of copper tubing is used for refrigeration or air-conditioning applications?
SEER includes the energy used in the start-up and shut-down cycles
20 A
Staples and tape
ACR (air-conditioning refrigeration) tubing

46. Will a dirty condenser cause a rise or fall in pressure?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
8
Rise
With 4' saddles

47. Do you need a trap on a pull-through evaporator?
Yes
Static pressure - velocity pressure - and total pressure
Inches of water column (in. WC)
25-ft or 50-ft

48. How is nominal-sized tubing sized?
40 degrees F
Yes
2
Inside diameter (ID)

49. How many cfm per ton?
Boil the liquid refrigerant out ot the oil within the crankcase
150
400
False

50. If the suction pressure rises - what happens to the head pressure?
45 degrees F
To remove humidity and lower dry bulb temperature
Yes
It also rises