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 does ACR copper pipe come?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Dehydrated with caps on each end
Infiltration and ventilation
Stranded

2. The A/C size is calculated by what?
Outside of the male fitting
Slugging
Heat load
Side-by-side and over-and-under

3. What are the three ways a motor can fail electrically?
Staples and tape
140 degrees F
Yes
Shorted winding - open winding - and grounded winding

4. Most duct insulation is made of what?
Before the vent
Fiberglass
Duct - electrical - and mechanical
Suction

5. Which is more efficient - a TXV or a fixed-orifice metering device?
2 minutes
TXV
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Outside of the male fitting

6. How many amps can 8 g wire handle?
To remove humidity and lower dry bulb temperature
Btu/hr (output) / wattage (input)
40 A
Shorted winding - open winding - and grounded winding

7. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
Yes
They are physically larger
A band 4 inches or more in width

8. What gauge is thermostat wire?
The takeoff fitting
150
18 gauge
Common

9. How is insulation around a duct rated?
Average feet per minute X area in square feet (H' x W'/144)
With an are rating
40 degrees F
High

10. Where is insulation used on copper tubing used for air-conditioning?
It rises
Below 800 degrees F
105 degrees F
The suction line or the low-pressure side

11. Does a package unit come from the factory pre-charged?
8
8-12 degrees F
Yes
Common

12. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
12000
When the system is under pressure
Yes

13. What is lined duct?
2
Vapor
Yes
Duct with insulation on the inside

14. What are normal conditions - as defined by the ARI.
Potential relay and start capacitor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Over 800 degrees F
Yes

15. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
2
Indoor fan motor - outdoor fan motor - and the compressor
They are physically larger

16. How does ACR copper pipe come?
Pistons
Infiltration and ventilation
Over 800 degrees F
Dehydrated with caps on each end

17. What are the three crafts normally associated with an air-conditioned installation?
Fiberglass
Duct - electrical - and mechanical
The takeoff fitting
ACR (air-conditioning refrigeration) tubing

18. What kind of refrigeratnts must be added in liquid form?
Rise
They are physically larger
Blended refrigerants
25-ft or 50-ft

19. Do you need a vent on a pull-through evaporator?
300
Indoor fan motor - outdoor fan motor - and the compressor
Yes
Suction

20. Where do you install a trap on a drain line?
Before the vent
4
Subtract ambient temperature from 100
Shorted winding - open winding - and grounded winding

21. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
Static pressure - velocity pressure - and total pressure
Btu/hr (output) / wattage (input)
SEER includes the energy used in the start-up and shut-down cycles

22. How is nominal-sized tubing sized?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
To remove humidity and lower dry bulb temperature
105 degrees F
Inside diameter (ID)

23. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
Staples and tape
200
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

24. What component changes refrigerant from a low pressure gas to a high pressure gas?
S-clips and drives (cleats)
Compressor
Over 800 degrees F
Common

25. How many amps can 14 g wire handle?
100 psig
5 degrees
15 A
30 A

26. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
A diffuser
Standard
Yes
L-type

27. How is the high pressure switch wired with the low pressure switch?
8-12 degrees F
High
In parallel
Rise

28. What are the two ways that fresh air enters a structure?
Below 800 degrees F
Staples and tape
Infiltration and ventilation
When it is a pull-through evaporator

29. If the rpm's are 1750 - how many poles does the motor have?
30-35 degrees above ambient
It will have a decrease in superheat
4
Blended refrigerants

30. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
The takeoff fitting
Heat load
Yes
In series

31. What do you use to check for leaks?
High
Heat load
Nitrogen with a small amount of refrigerant
TXV

32. Where do you apply flux when soldering?
45 degrees F
Outside of the male fitting
Nominal-sized tubing
Nominal-sized tubing

33. 6' round duct has a ballpark cfm of what?
Indoor fan motor - outdoor fan motor - and the compressor
In parallel
TXV
100

34. If the rpm's are 3450 - how many poles does the motor have?
True
15 A
A diffuser
2

35. What are the components of a hard-start kit?
Potential relay and start capacitor
TXV
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes

36. 13 SEER is classified as what kind of efficiency?
150
12000
High
Yes

37. If the rpm's are 1050 - how many poles does the motor have?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Heat loss
300
6

38. What distributes supply air to a room in a structure?
The takeoff fitting
30 degrees F
30-35 degrees above ambient
A diffuser

39. What is it called when liquid refrigerant gets into the compressor?
Slugging
TXV
15 A
100 psig

40. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Shorted winding - open winding - and grounded winding
40 degrees F
300
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

41. How will too much refrigerant effect subcooling?
Potential relay and start capacitor
RLA/FLA x 5
It will be high
TXV

42. What is the typical pressure differance across a TXV?
Inclined manometer
100 psig
Vapor
12000

43. At what temperature does refrigerant condense in a standard-efficiency unit?
Negative
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Yes
30-35 degrees above ambient

44. The A/C size is calculated by what?
A swaging tool
Heat load
40 A
Standard

45. How are round ducts supported?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

46. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
ACR (air-conditioning refrigeration) tubing
When the system is under pressure
Dehydrated with caps on each end

47. The crankcase heater on an air-conditioning compressor is used to what?
30 A
Boil the liquid refrigerant out ot the oil within the crankcase
40 degrees F
15% silphos

48. How are round ducts supported?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

49. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Positive
High
Latent and sensible

50. What are the two types of return air systems in residential installations?
150
The suction line or the low-pressure side
Pull a vacuum
Individual return air systems and central return air systems