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. 8' round duct has a ballpark cfm of what?
Potential relay and start capacitor
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
4
200

2. How will too much refrigerant effect subcooling?
It will be high
Pistons
8-12 degrees F
Over 800 degrees F

3. Do you need a vent on a push-through evaporator?
A swaging tool
Latent and sensible
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

4. How is flexible duct supported?
A band 4 inches or more in width
When it is a pull-through evaporator
12000
15 A

5. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Infiltration and ventilation
Side-by-side and over-and-under
In series
Pi x radius squared

6. What are the three pressures created by moving air in ductwork?
Duct with insulation on the inside
30 degrees F
It will be high
Static pressure - velocity pressure - and total pressure

7. How is flexible duct supported?
150
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Yes
A band 4 inches or more in width

8. What is the design boiling point for most evaporator coils in residential air conditioning?
Yes
In series
40 degrees F
True

9. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
They are larger
They are physically larger
Outside diameter (OD)

10. Where do you check the amps on a motor?
Nominal-sized tubing
Pi x radius squared
On the common terminal
Yes

11. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Yes
30 degrees F
140 degrees F
200

12. How do you calculate EER?
140 degrees F
12000
2
Btu/hr (output) / wattage (input)

13. What do you use to check for leaks?
2 minutes
Nitrogen with a small amount of refrigerant
Any amount
Boil the liquid refrigerant out ot the oil within the crankcase

14. How are round ducts connected to one another?
Yes
With a minimum of three evenly spaced self-tapping screws
140 degrees F
S-clips and drives (cleats)

15. On what terminal do you check amperage?
Nitrogen with a small amount of refrigerant
In series
Common
They are physically larger

16. What are the three major power-consuming devices on an air-conditioning system?
It will have a decrease in superheat
In parallel
Indoor fan motor - outdoor fan motor - and the compressor
105 degrees F

17. How many amps can 8 g wire handle?
2 minutes
40 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
40 degrees F

18. What kind of metering device do high-efficiency units usually use?
TXV
Static pressure - velocity pressure - and total pressure
By increasing the surface of the condenser coil
18 gauge

19. Do you need a vent on a pull-through evaporator?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Shorted winding - open winding - and grounded winding
1/4'
Yes

20. How many amps can 12 g wire handle?
20 A
Below 800 degrees F
It rises
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

21. In what length rolls is soft copper tubing normally available?
Fiberglass
Outside of the male fitting
25-ft or 50-ft
15% silphos

22. When do you install an auxillary drain pan?
Average feet per minute X area in square feet (H' x W'/144)
400
With a minimum of three evenly spaced self-tapping screws
When it is above a conditioned space

23. If the rpm's are 750 - how many poles does the motor have?
Nitrogen with a small amount of refrigerant
8
300
When the system is under pressure

24. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
On the common terminal
Before the vent
Negative

25. What are the two types of package units?
105 degrees F
Side-by-side and over-and-under
Blended refrigerants
It will be high

26. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
They are physically larger
No
105 degrees F

27. What kind of copper tubing is used for refrigeration or air-conditioning applications?
2
Slugging
Individual return air systems and central return air systems
ACR (air-conditioning refrigeration) tubing

28. Where do you apply flux when soldering?
Outside of the male fitting
1/4'
RLA/FLA x 5
With 4' saddles

29. 9' round duct has a ballpark cfm of what?
300
When the system is under pressure
A piston type metering device
High

30. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
It will be low
A swaging tool
30 degrees F
Over/under and side by side

31. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
With 4' saddles
Dehydrated with caps on each end
The suction line or the low-pressure side

32. What are the components of a hard-start kit?
Heat load
Potential relay and start capacitor
They are physically larger
Positive

33. The load on the evaporater will effect which pressure?
Individual return air systems and central return air systems
Negative
200
Suction

34. What are the four materials used to make duct?
Yes
Common
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
False

35. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
It will have a decrease in superheat
Before the vent
Indoor fan motor - outdoor fan motor - and the compressor

36. What is lined duct?
15% silphos
Duct with insulation on the inside
Yes
Staples and tape

37. At what temperature will soft solder melt?
A bypass duct or a dump zone
With a minimum of three evenly spaced self-tapping screws
45-55%
Below 800 degrees F

38. 9' round duct has a ballpark cfm of what?
When the system is under pressure
Staples and tape
Blended refrigerants
300

39. In what length rolls is soft copper tubing normally available?
400
A diffuser
25-ft or 50-ft
Pull a vacuum

40. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
A dirty evaporator
5 degrees
Yes

41. What is the typical pressure differance across a TXV?
1/4'
100 psig
To remove humidity and lower dry bulb temperature
Any amount

42. What gauge is thermostat wire?
Shorted winding - open winding - and grounded winding
Compressor
18 gauge
Indoor fan motor - outdoor fan motor - and the compressor

43. What are the two types of package units?
With 4' saddles
Side-by-side and over-and-under
40 degrees F
TXV

44. The A/C size is calculated by what?
Inclined manometer
20 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Heat load

45. What is the typical pressure differance across a TXV?
On the common terminal
8
100 psig
Nitrogen with a small amount of refrigerant

46. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
A diffuser
In series
Below 800 degrees F
A piston type metering device

47. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
A bypass duct or a dump zone
1/4'
Heat loss

48. What is a package unit?
When the system is under pressure
Slugging
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
105 degrees F

49. What sort of pressure will a push-through evaporator have?
They are physically larger
Positive
Suction
Inside diameter (ID)

50. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
Yes
Positive
False