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. The A/C size is calculated by what?
Heat load
They are larger
To remove humidity and lower dry bulb temperature
SEER includes the energy used in the start-up and shut-down cycles

2. What kind of metering device do high-efficiency units usually use?
Boil the liquid refrigerant out ot the oil within the crankcase
Over/under and side by side
Negative
TXV

3. Where do you check the amps on a motor?
On the common terminal
Before the vent
Subtract ambient temperature from 100
Vapor

4. Does a package unit come from the factory pre-charged?
Yes
In parallel
False
Heat loss

5. What are the two basic duct connection configurations for package units supply and return air ducts?
It will be low
15 A
Staples and tape
Over/under and side by side

6. How many BTU's per ton?
12000
To lower the amount of pressure drop through the coil
A bypass duct or a dump zone
When it is above a conditioned space

7. Does a package unit come from the factory pre-charged?
Yes
RLA/FLA x 5
15 A
2 minutes

8. What can cause a decrease in suction pressure on an air-conditioning system?
Btu/hr (output) / wattage (input)
A dirty evaporator
A swaging tool
It will have a decrease in superheat

9. How is flexible duct supported?
40 degrees F
140 degrees F
4
A band 4 inches or more in width

10. If the rpm's are 1750 - how many poles does the motor have?
Subtract ambient temperature from 100
No
4
With 4' saddles

11. Do you need a vent on a push-through evaporator?
It will be high
It rises
Individual return air systems and central return air systems
Yes

12. What is the normal evaporator temperature?
Yes
45 degrees F
300
Nominal-sized tubing

13. Most duct insulation is made of what?
A diffuser
Infiltration and ventilation
When it is a pull-through evaporator
Fiberglass

14. On what terminal do you check amperage?
Pi x radius squared
140 degrees F
400
Common

15. Superheat should never be below how many degrees
Heat load
TXV
Yes
5 degrees

16. How many amps can 14 g wire handle?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
15 A
Heat load
When the system is under pressure

17. How are round ducts connected to one another?
A diffuser
With a minimum of three evenly spaced self-tapping screws
Btu/hr (output) / wattage (input)
ACR (air-conditioning refrigeration) tubing

18. The load on the evaporater will effect which pressure?
Suction
A diffuser
To remove humidity and lower dry bulb temperature
Duct with insulation on the inside

19. What do you use to check for leaks?
Btu/hr (output) / wattage (input)
Nitrogen with a small amount of refrigerant
Heat loss
No

20. How is nominal-sized tubing sized?
Any amount
False
Inside diameter (ID)
SEER includes the energy used in the start-up and shut-down cycles

21. Where do you apply flux when soldering?
20 degrees F
Over 800 degrees F
They are physically larger
Outside of the male fitting

22. Where is insulation used on copper tubing used for air-conditioning?
2 minutes
Yes
The suction line or the low-pressure side
SEER includes the energy used in the start-up and shut-down cycles

23. 10 SEER is classified as what kind of efficiency?
Standard
The suction line or the low-pressure side
300
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

24. What are the two functions of the air-conditioning system?
Side-by-side and over-and-under
When it is above a conditioned space
To remove humidity and lower dry bulb temperature
The suction line or the low-pressure side

25. What is considered normal operating conditions?
400
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Staples and tape
Individual return air systems and central return air systems

26. 7' round duct has a ballpark cfm of what?
To lower the amount of pressure drop through the coil
Static pressure - velocity pressure - and total pressure
A bypass duct or a dump zone
150

27. How many amps can 10 g wire handle?
25-ft or 50-ft
15 A
30 A
Common

28. How do you calculate cfm?

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

29. At what temperature will brazing melt?
Outside of the male fitting
Over 800 degrees F
8-12 degrees F
25-ft or 50-ft

30. What do you use to check for leaks?
Indoor fan motor - outdoor fan motor - and the compressor
150
30 A
Nitrogen with a small amount of refrigerant

31. At what temperature will soft solder melt?
140 degrees F
Below 800 degrees F
TXV
Belt drive and direct drive

32. The furnace size is calculated by what?
Infiltration and ventilation
Heat loss
A swaging tool
Latent and sensible

33. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
40 A
Blended refrigerants
True

34. What distributes supply air to a room in a structure?
With an are rating
Average feet per minute X area in square feet (H' x W'/144)
Latent and sensible
A diffuser

35. If the rpm's are 3450 - how many poles does the motor have?
By increasing the surface of the condenser coil
A diffuser
2
5 degrees

36. Where do you apply flux when soldering?
Outside of the male fitting
8
Yes
When the system is under pressure

37. Most duct insulation is made of what?
Fiberglass
No
Yes
30-35 degrees above ambient

38. What do you do after you braze a system?
High
Boil the liquid refrigerant out ot the oil within the crankcase
Inclined manometer
Pull a vacuum

39. What is lined duct?
Duct with insulation on the inside
40 degrees F
No
Outside of the male fitting

40. What is used to measure static air pressure in ducts.
Nitrogen with a small amount of refrigerant
Inclined manometer
150
Vapor

41. How do you calculate LRA?
Pi x radius squared
RLA/FLA x 5
25-ft or 50-ft
Before the vent

42. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Heat load
2
6
To lower the amount of pressure drop through the coil

43. A reciprocating compressor has what sort of moving parts?
Dehydrated with caps on each end
Pull a vacuum
Pistons
Staples and tape

44. The furnace size is calculated by what?
Heat loss
1/4'
25-ft or 50-ft
140 degrees F

45. How will too much refrigerant effect subcooling?
In series
8
Outside of the male fitting
It will be high

46. How many amps can 12 g wire handle?
Infiltration and ventilation
A piston type metering device
5 degrees
20 A

47. What do you use to connect square and rectangular ductboard together?
1/4'
40 A
A diffuser
S-clips and drives (cleats)

48. The A/C size is calculated by what?
It will be low
To lower the amount of pressure drop through the coil
Heat load
40 degrees F

49. How many amps can 8 g wire handle?
S-clips and drives (cleats)
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
40 A
Common

50. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Yes
30 degrees F
2 minutes