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. Do you need a vent on a push-through evaporator?
The suction line or the low-pressure side
Heat load
With a minimum of three evenly spaced self-tapping screws
Yes

2. What do you use to connect square and rectangular ductboard together?
Inclined manometer
S-clips and drives (cleats)
By increasing the surface of the condenser coil
In parallel

3. How do you calculate cfm?

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4. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Fiberglass
They are physically larger
Below 800 degrees F
True

5. What gauge is thermostat wire?
18 gauge
When the system is under pressure
A band 4 inches or more in width
8-12 degrees F

6. What is the range for normal superheat and subcooling?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
8-12 degrees F
Any amount
45 degrees F

7. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
A swaging tool
Nominal-sized tubing
Side-by-side and over-and-under

8. How many cfm per ton?
400
20 A
Static pressure - velocity pressure - and total pressure
Inclined manometer

9. When do you install a trap on a drain line?
20 degrees above ambient
Over 800 degrees F
Shorted winding - open winding - and grounded winding
When it is a pull-through evaporator

10. The compressor is cooled by liquid refrigerant. (True of False)
A dirty evaporator
RLA/FLA x 5
TXV
False

11. How many amps can 12 g wire handle?
They are physically larger
Subtract ambient temperature from 100
2
20 A

12. What is the design boiling point for most evaporator coils in residential air conditioning?
With 4' saddles
Yes
40 degrees F
Suction

13. 13 SEER is classified as what kind of efficiency?
ACR (air-conditioning refrigeration) tubing
High
Duct - electrical - and mechanical
5 degrees

14. The evaporator is designed to remove what two types of heat?
Latent and sensible
ACR (air-conditioning refrigeration) tubing
When the system is under pressure
Standard

15. What is used to measure static air pressure in ducts.
Fiberglass
Inclined manometer
Boil the liquid refrigerant out ot the oil within the crankcase
150

16. What is considered normal operating conditions?
Blended refrigerants
To remove humidity and lower dry bulb temperature
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
140 degrees F

17. How long should you leave a system off once you kill power before restarting it?
8-12 degrees F
2 minutes
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Side-by-side and over-and-under

18. Why are some ACR tubing lines insulated?
Pistons
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Boil the liquid refrigerant out ot the oil within the crankcase
A dirty evaporator

19. The load on the evaporater will effect which pressure?
In series
With an are rating
Suction
No

20. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
With an are rating
40 A
Yes
40 degrees F

21. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
8
ACR (air-conditioning refrigeration) tubing
S-clips and drives (cleats)

22. Which is more efficient - a TXV or a fixed-orifice metering device?
8-12 degrees F
Pistons
TXV
A swaging tool

23. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
20 degrees F
Fiberglass
Shorted winding - open winding - and grounded winding

24. 6' round duct has a ballpark cfm of what?
45-55%
Before the vent
100
TXV

25. The compressor is cooled by liquid refrigerant. (True of False)
With an are rating
Positive
False
It will have a decrease in superheat

26. What are the three pressures created by moving air in ductwork?
Vapor
Static pressure - velocity pressure - and total pressure
5 degrees
To remove humidity and lower dry bulb temperature

27. What kind of copper tubing is used for plumbing and heating applications?
Btu/hr (output) / wattage (input)
Stranded
100
Nominal-sized tubing

28. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
Yes
Common
8-12 degrees F

29. What type of air conditioning system must be charged using the superheat method?
S-clips and drives (cleats)
A piston type metering device
To lower the amount of pressure drop through the coil
High

30. At what temperature will soft solder melt?
A band 4 inches or more in width
TXV
Boil the liquid refrigerant out ot the oil within the crankcase
Below 800 degrees F

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

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32. What type of air conditioning system must be charged using the superheat method?
They are larger
Individual return air systems and central return air systems
A piston type metering device
6

33. What gauge is thermostat wire?
18 gauge
Side-by-side and over-and-under
To remove humidity and lower dry bulb temperature
150

34. How many amps can 14 g wire handle?
5 degrees
4
In series
15 A

35. How many amps can 14 g wire handle?
When the system is under pressure
They are larger
45-55%
15 A

36. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
The takeoff fitting
400
RLA/FLA x 5

37. Which type of wire can handle a higher ampacity?
Stranded
TXV
Average feet per minute X area in square feet (H' x W'/144)
Static pressure - velocity pressure - and total pressure

38. On what terminal do you check amperage?
25-ft or 50-ft
45-55%
RLA/FLA x 5
Common

39. What is lined duct?
Yes
SEER includes the energy used in the start-up and shut-down cycles
Over 800 degrees F
Duct with insulation on the inside

40. If pressure rises - what happens to the superheat?
The takeoff fitting
It rises
S-clips and drives (cleats)
A band 4 inches or more in width

41. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
ACR (air-conditioning refrigeration) tubing
Rise
45-55%
False

42. What kind of refrigeratnts must be added in liquid form?
ACR (air-conditioning refrigeration) tubing
TXV
Blended refrigerants
To lower the amount of pressure drop through the coil

43. What component changes refrigerant from a low pressure gas to a high pressure gas?
When the system is under pressure
5 degrees
Compressor
Outside diameter (OD)

44. How is the high pressure switch wired with the low pressure switch?
In parallel
100 psig
Static pressure - velocity pressure - and total pressure
Heat load

45. The evaporator is designed to remove what two types of heat?
Latent and sensible
Inside diameter (ID)
In parallel
Pistons

46. Superheat should never be below how many degrees
400
100 psig
Btu/hr (output) / wattage (input)
5 degrees

47. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
When it is a pull-through evaporator
Belt drive and direct drive
Average feet per minute X area in square feet (H' x W'/144)

48. How many BTU's per ton?
12000
Over 800 degrees F
Inclined manometer
Individual return air systems and central return air systems

49. How many amps can 12 g wire handle?
Yes
When it is a pull-through evaporator
20 A
Subtract ambient temperature from 100

50. Do you need a vent on a pull-through evaporator?
In series
Yes
Compressor
Suction