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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?
Heat loss
18 gauge
Over/under and side by side
Before the vent

2. If the rpm's are 1050 - how many poles does the motor have?
6
Individual return air systems and central return air systems
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Stranded

3. What tool is used to expand the diameter of soft copper tubing
Any amount
A swaging tool
Average feet per minute X area in square feet (H' x W'/144)
Outside of the male fitting

4. How do you calculate ballpark superheat?
Rise
Positive
40 degrees F
Subtract ambient temperature from 100

5. What distributes supply air to a room in a structure?
20 degrees above ambient
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
A diffuser
RLA/FLA x 5

6. What are the two types of package units?
Side-by-side and over-and-under
In series
A diffuser
Inside diameter (ID)

7. Superheat should never be below how many degrees
On the common terminal
High
5 degrees
A bypass duct or a dump zone

8. Do you need a vent on a push-through evaporator?
40 degrees F
RLA/FLA x 5
1/4'
Yes

9. How many cfm per ton?
Inches of water column (in. WC)
Over 800 degrees F
The suction line or the low-pressure side
400

10. The A/C size is calculated by what?
They are physically larger
Infiltration and ventilation
Heat load
12000

11. At what temperature does refrigerant condense in a high-efficiency unit?
Slugging
20 degrees above ambient
Yes
Btu/hr (output) / wattage (input)

12. The evaporator is designed to remove what two types of heat?
It also rises
To remove humidity and lower dry bulb temperature
Latent and sensible
When the system is under pressure

13. Where is insulation used on copper tubing used for air-conditioning?
1/4'
False
150
The suction line or the low-pressure side

14. How is the high pressure switch wired with the low pressure switch?
Yes
In parallel
L-type
Standard

15. How do you achieve high-efficiency?
300
By increasing the surface of the condenser coil
When it is a pull-through evaporator
False

16. On what terminal do you check amperage?
A dirty evaporator
2 minutes
Common
With an are rating

17. The evaporator is designed to remove what two types of heat?
Yes
Latent and sensible
Static pressure - velocity pressure - and total pressure
Outside of the male fitting

18. Do you need a vent on a pull-through evaporator?
Yes
Staples and tape
Outside of the male fitting
40 degrees F

19. What are the three ways a motor can fail electrically?
On the common terminal
Shorted winding - open winding - and grounded winding
8
Yes

20. What component changes refrigerant from a low pressure gas to a high pressure gas?
40 degrees F
By increasing the surface of the condenser coil
Compressor
Duct with insulation on the inside

21. What is the range for normal superheat and subcooling?
Subtract ambient temperature from 100
A bypass duct or a dump zone
Individual return air systems and central return air systems
8-12 degrees F

22. 13 SEER is classified as what kind of efficiency?
High
1/4'
Stranded
True

23. How many cfm per ton?
The takeoff fitting
Standard
400
Static pressure - velocity pressure - and total pressure

24. How are round ducts connected to one another?
Latent and sensible
Yes
It will be high
With a minimum of three evenly spaced self-tapping screws

25. How are the condenser coils different on a high-efficiency unit?
With an are rating
A diffuser
They are larger
It also rises

26. What are the two types of package units?
Subtract ambient temperature from 100
With an are rating
Side-by-side and over-and-under
2 minutes

27. Which type of wire can handle a higher ampacity?
A swaging tool
Before the vent
8-12 degrees F
Stranded

28. How do you calculate cfm?

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29. Why are some ACR tubing lines insulated?
Side-by-side and over-and-under
200
It also rises
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

30. Sections of duct board can be fastened together with what?
Staples and tape
Yes
400
When it is above a conditioned space

31. 10 SEER is classified as what kind of efficiency?
Belt drive and direct drive
L-type
25-ft or 50-ft
Standard

32. What are the two basic duct connection configurations for package units supply and return air ducts?
The suction line or the low-pressure side
ACR (air-conditioning refrigeration) tubing
Over/under and side by side
8

33. When must a copper joint never be soldered or brazed?
30-35 degrees above ambient
L-type
When the system is under pressure
A diffuser

34. What component changes refrigerant from a low pressure gas to a high pressure gas?
30 degrees F
The takeoff fitting
Compressor
SEER includes the energy used in the start-up and shut-down cycles

35. What are the two basic duct connection configurations for package units supply and return air ducts?
In parallel
Over/under and side by side
300
300

36. 6' round duct has a ballpark cfm of what?
Boil the liquid refrigerant out ot the oil within the crankcase
100
It also rises
TXV

37. How is insulation around a duct rated?
15 A
With an are rating
1/4'
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

38. What are the three crafts normally associated with an air-conditioned installation?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A swaging tool
140 degrees F
Duct - electrical - and mechanical

39. 9' round duct has a ballpark cfm of what?
The takeoff fitting
Outside of the male fitting
A piston type metering device
300

40. What are the two ways that fresh air enters a structure?
Staples and tape
Infiltration and ventilation
On the common terminal
40 degrees F

41. What is lined duct?
Common
To lower the amount of pressure drop through the coil
Duct with insulation on the inside
Compressor

42. How is nominal-sized tubing sized?
15% silphos
Slugging
300
Inside diameter (ID)

43. What is it called when liquid refrigerant gets into the compressor?
Slugging
The takeoff fitting
To remove humidity and lower dry bulb temperature
100 psig

44. What are the two types of blower drives?
It will be low
Belt drive and direct drive
A band 4 inches or more in width
Below 800 degrees F

45. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
A diffuser
40 degrees F
140 degrees F
L-type

46. The fan switch closes at what temperature?
On the common terminal
140 degrees F
In series
Pull a vacuum

47. Do you need a trap on a pull-through evaporator?
Yes
Vapor
8-12 degrees F
It also rises

48. Does a package unit come from the factory pre-charged?
30-35 degrees above ambient
TXV
Yes
It rises

49. What can cause a decrease in suction pressure on an air-conditioning system?
Latent and sensible
A dirty evaporator
Nitrogen with a small amount of refrigerant
400

50. How will too much refrigerant effect superheat?
It will have a decrease in superheat
It will be low
High
Common