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. On what terminal do you check amperage?
False
Common
Duct with insulation on the inside
Pi x radius squared

2. The furnace size is calculated by what?
Compressor
Outside of the male fitting
Heat loss
Duct - electrical - and mechanical

3. The crankcase heater on an air-conditioning compressor is used to what?
High
200
Boil the liquid refrigerant out ot the oil within the crankcase
Standard

4. 9' round duct has a ballpark cfm of what?
30 degrees F
300
8-12 degrees F
Nitrogen with a small amount of refrigerant

5. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Fiberglass
Duct - electrical - and mechanical
30 A
30 degrees F

6. What kind of refrigeratnts must be added in liquid form?
Inches of water column (in. WC)
Blended refrigerants
Common
Outside of the male fitting

7. Where do you install a trap on a drain line?
2
30 A
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Before the vent

8. Superheat should never be below how many degrees
Pull a vacuum
False
5 degrees
Staples and tape

9. How many amps can 12 g wire handle?
20 A
30 A
False
2 minutes

10. How does ACR copper pipe come?
The suction line or the low-pressure side
Dehydrated with caps on each end
Duct - electrical - and mechanical
Yes

11. The evaporator is designed to remove what two types of heat?
Latent and sensible
When it is a pull-through evaporator
15 A
105 degrees F

12. How many amps can 14 g wire handle?
Boil the liquid refrigerant out ot the oil within the crankcase
40 degrees F
Yes
15 A

13. What are the two ways that fresh air enters a structure?
25-ft or 50-ft
Dehydrated with caps on each end
False
Infiltration and ventilation

14. 6' round duct has a ballpark cfm of what?
100
105 degrees F
The takeoff fitting
It also rises

15. On what terminal do you check amperage?
Stranded
Individual return air systems and central return air systems
Common
Rise

16. The A/C size is calculated by what?
Heat load
Duct - electrical - and mechanical
On the common terminal
Below 800 degrees F

17. The crankcase heater on an air-conditioning compressor is used to what?
Nominal-sized tubing
Boil the liquid refrigerant out ot the oil within the crankcase
With a minimum of three evenly spaced self-tapping screws
8-12 degrees F

18. What is the typical pressure differance across a TXV?
A bypass duct or a dump zone
To lower the amount of pressure drop through the coil
30 A
100 psig

19. What is lined duct?
40 degrees F
Over 800 degrees F
By increasing the surface of the condenser coil
Duct with insulation on the inside

20. What is the range for normal superheat and subcooling?
8-12 degrees F
Negative
With 4' saddles
A diffuser

21. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Inside diameter (ID)
L-type
18 gauge
8-12 degrees F

22. Where is insulation used on copper tubing used for air-conditioning?
RLA/FLA x 5
2 minutes
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
The suction line or the low-pressure side

23. What are the components of a hard-start kit?
Potential relay and start capacitor
Btu/hr (output) / wattage (input)
Subtract ambient temperature from 100
On the common terminal

24. 13 SEER is classified as what kind of efficiency?
Heat loss
High
20 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

25. How is the high pressure switch wired with the low pressure switch?
40 A
It will be high
Stranded
In parallel

26. Where do you apply flux when soldering?
Outside of the male fitting
ACR (air-conditioning refrigeration) tubing
6
105 degrees F

27. What is the design boiling point for most evaporator coils in residential air conditioning?
TXV
Static pressure - velocity pressure - and total pressure
40 degrees F
15 A

28. How many BTU's per ton?
12000
Yes
15% silphos
Suction

29. What percentage silver do you need to use for an are-410 system?
Pistons
ACR (air-conditioning refrigeration) tubing
15% silphos
A swaging tool

30. Where do you check the amps on a motor?
140 degrees F
No
Duct with insulation on the inside
On the common terminal

31. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
4
Before the vent
Positive
They are physically larger

32. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
140 degrees F
200
20 degrees F

33. How many BTU's per ton?
Outside of the male fitting
A swaging tool
12000
Outside diameter (OD)

34. Most duct insulation is made of what?
By increasing the surface of the condenser coil
400
Fiberglass
Average feet per minute X area in square feet (H' x W'/144)

35. How is the high pressure switch wired with the low pressure switch?
When the system is under pressure
Btu/hr (output) / wattage (input)
In parallel
Latent and sensible

36. How many amps can 12 g wire handle?
20 degrees above ambient
20 A
It rises
Yes

37. Does a package unit come from the factory pre-charged?
Staples and tape
Potential relay and start capacitor
Yes
It will have a decrease in superheat

38. What are the two basic duct connection configurations for package units supply and return air ducts?
15 A
It will have a decrease in superheat
Over/under and side by side
Slugging

39. What is the range for normal superheat and subcooling?
2
105 degrees F
Dehydrated with caps on each end
8-12 degrees F

40. How do you calculate EER?
Btu/hr (output) / wattage (input)
400
105 degrees F
TXV

41. How are the condenser coils different on a high-efficiency unit?
Over 800 degrees F
Inside diameter (ID)
They are larger
40 degrees F

42. What is the difference between SEER and EER?
140 degrees F
SEER includes the energy used in the start-up and shut-down cycles
With a minimum of three evenly spaced self-tapping screws
Boil the liquid refrigerant out ot the oil within the crankcase

43. How is flexible duct supported?
A band 4 inches or more in width
Yes
Inclined manometer
Belt drive and direct drive

44. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
150
With 4' saddles
It also rises

45. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Subtract ambient temperature from 100
4
30 A

46. What are the two types of blower drives?
Yes
150
Suction
Belt drive and direct drive

47. What is the difference between SEER and EER?
When the system is under pressure
2
150
SEER includes the energy used in the start-up and shut-down cycles

48. How do you calculate the area of a circle?
Over 800 degrees F
Duct - electrical - and mechanical
140 degrees F
Pi x radius squared

49. How is nominal-sized tubing sized?
They are physically larger
Inside diameter (ID)
TXV
20 A

50. What type of air conditioning system must be charged using the superheat method?
Inside diameter (ID)
Average feet per minute X area in square feet (H' x W'/144)
A piston type metering device
They are physically larger