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. Where is insulation used on copper tubing used for air-conditioning?
When the system is under pressure
1/4'
The suction line or the low-pressure side
200

2. What are the components of a hard-start kit?
Compressor
In series
True
Potential relay and start capacitor

3. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
When it is above a conditioned space
It also rises
They are larger
Any amount

4. What do you use to connect square and rectangular ductboard together?
Outside of the male fitting
S-clips and drives (cleats)
They are larger
400

5. On what terminal do you check amperage?
Common
Over/under and side by side
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Subtract ambient temperature from 100

6. 6' round duct has a ballpark cfm of what?
It also rises
A piston type metering device
100
A band 4 inches or more in width

7. At what temperature will brazing melt?
Over 800 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
30 A
Latent and sensible

8. What percentage silver do you need to use for an are-410 system?
15% silphos
ACR (air-conditioning refrigeration) tubing
L-type
S-clips and drives (cleats)

9. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Infiltration and ventilation
A band 4 inches or more in width
Boil the liquid refrigerant out ot the oil within the crankcase

10. The evaporator is designed to remove what two types of heat?
1/4'
100 psig
Latent and sensible
The suction line or the low-pressure side

11. Do you need a vent on a pull-through evaporator?
400
S-clips and drives (cleats)
200
Yes

12. 13 SEER is classified as what kind of efficiency?
In series
Individual return air systems and central return air systems
It rises
High

13. Where do you install a trap on a drain line?
A bypass duct or a dump zone
Before the vent
5 degrees
Pistons

14. What tool is used to expand the diameter of soft copper tubing
A swaging tool
TXV
Nominal-sized tubing
True

15. Do you need a trap on a push-through evaporator?
Dehydrated with caps on each end
With an are rating
No
40 degrees F

16. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
200
When it is above a conditioned space
Any amount

17. If the rpm's are 1750 - how many poles does the motor have?
4
100 psig
150
8-12 degrees F

18. How is insulation around a duct rated?
Vapor
40 degrees F
It will have a decrease in superheat
With an are rating

19. Where do you apply flux when soldering?
They are larger
Latent and sensible
15 A
Outside of the male fitting

20. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
4
4
Potential relay and start capacitor

21. Which is more efficient - a TXV or a fixed-orifice metering device?
Pull a vacuum
Any amount
Yes
TXV

22. How is ACR tubing sized?
8
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Outside diameter (OD)
8

23. The furnace size is calculated by what?
In series
Heat loss
With an are rating
High

24. How many amps can 8 g wire handle?
Outside of the male fitting
40 A
When it is above a conditioned space
18 gauge

25. What gauge is thermostat wire?
Yes
18 gauge
Btu/hr (output) / wattage (input)
15 A

26. 6' round duct has a ballpark cfm of what?
100
True
Slugging
Inches of water column (in. WC)

27. What distributes supply air to a room in a structure?
Duct - electrical - and mechanical
150
20 degrees above ambient
A diffuser

28. What are the two functions of the air-conditioning system?
Heat load
Positive
40 degrees F
To remove humidity and lower dry bulb temperature

29. What is the design boiling point for most evaporator coils in residential air conditioning?
25-ft or 50-ft
40 degrees F
105 degrees F
20 degrees above ambient

30. How many BTU's per ton?
Negative
12000
40 degrees F
A bypass duct or a dump zone

31. How many amps can 10 g wire handle?
30 A
140 degrees F
200
Over 800 degrees F

32. 13 SEER is classified as what kind of efficiency?
40 degrees F
A dirty evaporator
False
High

33. When do you install a trap on a drain line?
Rise
TXV
15% silphos
When it is a pull-through evaporator

34. What are the three ways a motor can fail electrically?
They are physically larger
Shorted winding - open winding - and grounded winding
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Duct with insulation on the inside

35. How do you calculate the area of a circle?
Stranded
Pi x radius squared
40 degrees F
40 A

36. 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
Yes
2 minutes
Yes

37. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Side-by-side and over-and-under
8
In series
Static pressure - velocity pressure - and total pressure

38. What are the two ways that fresh air enters a structure?
When it is above a conditioned space
Average feet per minute X area in square feet (H' x W'/144)
Infiltration and ventilation
A bypass duct or a dump zone

39. The fan switch opens at what temperature?
105 degrees F
A dirty evaporator
8
Outside of the male fitting

40. If the suction pressure rises - what happens to the head pressure?
Blended refrigerants
8-12 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
It also rises

41. How will too much refrigerant effect subcooling?
15 A
It will be high
Static pressure - velocity pressure - and total pressure
Boil the liquid refrigerant out ot the oil within the crankcase

42. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
With 4' saddles
L-type
ACR (air-conditioning refrigeration) tubing
Inside diameter (ID)

43. What is the difference between SEER and EER?
2
Yes
SEER includes the energy used in the start-up and shut-down cycles
100

44. How do you achieve high-efficiency?
Any amount
By increasing the surface of the condenser coil
When it is above a conditioned space
Rise

45. What kind of refrigeratnts must be added in liquid form?
20 A
A bypass duct or a dump zone
Pull a vacuum
Blended refrigerants

46. What are the three crafts normally associated with an air-conditioned installation?
Stranded
True
Below 800 degrees F
Duct - electrical - and mechanical

47. Which type of wire can handle a higher ampacity?
Blended refrigerants
When it is above a conditioned space
Stranded
5 degrees

48. How will too much refrigerant effect superheat?
TXV
It will be low
Inches of water column (in. WC)
Latent and sensible

49. What is the normal evaporator temperature?
Individual return air systems and central return air systems
2 minutes
In series
45 degrees F

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