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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. What kind of metering device do high-efficiency units usually use?
6
It rises
TXV
20 A

2. How many cfm per ton?
Shorted winding - open winding - and grounded winding
True
400
Individual return air systems and central return air systems

3. How is the high pressure switch wired with the low pressure switch?
30 A
In parallel
Infiltration and ventilation
Side-by-side and over-and-under

4. Do you need a trap on a push-through evaporator?
No
Side-by-side and over-and-under
Heat loss
False

5. If the suction pressure rises - what happens to the head pressure?
8
It also rises
Below 800 degrees F
True

6. What are the two types of blower drives?
40 degrees F
4
400
Belt drive and direct drive

7. What are the two basic duct connection configurations for package units supply and return air ducts?
45 degrees F
300
Over/under and side by side
150

8. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Shorted winding - open winding - and grounded winding
Belt drive and direct drive
False

9. How many BTU's per ton?
TXV
12000
Yes
Yes

10. What is lined duct?
With 4' saddles
Duct with insulation on the inside
Inclined manometer
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

11. What is the normal evaporator temperature?
20 A
A band 4 inches or more in width
25-ft or 50-ft
45 degrees F

12. If the rpm's are 750 - how many poles does the motor have?
300
8
A diffuser
Staples and tape

13. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
Heat load
Side-by-side and over-and-under
Potential relay and start capacitor

14. A reciprocating compressor has what sort of moving parts?
25-ft or 50-ft
Negative
Pistons
False

15. What component changes refrigerant from a low pressure gas to a high pressure gas?
A swaging tool
False
25-ft or 50-ft
Compressor

16. What percentage silver do you need to use for an are-410 system?
6
To lower the amount of pressure drop through the coil
15% silphos
Before the vent

17. How many amps can 8 g wire handle?
40 A
12000
15% silphos
Below 800 degrees F

18. How will too much refrigerant effect superheat?
Yes
Static pressure - velocity pressure - and total pressure
In parallel
It will be low

19. How many amps can 12 g wire handle?
1/4'
20 A
Yes
Fiberglass

20. Which is more efficient - a TXV or a fixed-orifice metering device?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
30 degrees F
TXV
40 degrees F

21. What are the four materials used to make duct?
When the system is under pressure
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
40 degrees F
When it is above a conditioned space

22. Do you need a vent on a push-through evaporator?
A band 4 inches or more in width
Yes
With a minimum of three evenly spaced self-tapping screws
Heat loss

23. What do you use to connect square and rectangular ductboard together?
It rises
S-clips and drives (cleats)
It will be low
When it is a pull-through evaporator

24. 6' round duct has a ballpark cfm of what?
105 degrees F
40 A
100
25-ft or 50-ft

25. Most duct insulation is made of what?
Negative
Static pressure - velocity pressure - and total pressure
Fiberglass
Negative

26. How do you calculate EER?
Btu/hr (output) / wattage (input)
L-type
Yes
Potential relay and start capacitor

27. On what terminal do you check amperage?
Inclined manometer
Compressor
To remove humidity and lower dry bulb temperature
Common

28. When do you install a trap on a drain line?
When it is a pull-through evaporator
40 degrees F
Fiberglass
Average feet per minute X area in square feet (H' x W'/144)

29. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
105 degrees F
45 degrees F
Outside diameter (OD)

30. The A/C size is calculated by what?
Heat load
In parallel
2 minutes
Any amount

31. Pressure in ductwork is measured In what?
Before the vent
Inches of water column (in. WC)
When it is a pull-through evaporator
40 degrees F

32. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
Heat load
SEER includes the energy used in the start-up and shut-down cycles
It will be high

33. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
Heat loss
Outside of the male fitting
2

34. What is the range for normal superheat and subcooling?
8-12 degrees F
SEER includes the energy used in the start-up and shut-down cycles
True
140 degrees F

35. At what temperature does refrigerant condense in a standard-efficiency unit?
20 degrees F
30-35 degrees above ambient
18 gauge
Outside diameter (OD)

36. What is considered normal operating conditions?
Rise
On the common terminal
200
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

37. What distributes supply air to a room in a structure?
400
A diffuser
Side-by-side and over-and-under
They are physically larger

38. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Duct with insulation on the inside
False
ACR (air-conditioning refrigeration) tubing
2

39. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
With a minimum of three evenly spaced self-tapping screws
45-55%
TXV
No

40. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
20 A
The suction line or the low-pressure side
40 degrees F
True

41. What type of air conditioning system must be charged using the superheat method?
30 A
Static pressure - velocity pressure - and total pressure
A piston type metering device
40 A

42. Do you need a trap on a pull-through evaporator?
400
Slugging
Yes
They are larger

43. In what state is the refrigerant in the compressor?
Outside of the male fitting
Fiberglass
False
Vapor

44. The furnace size is calculated by what?
TXV
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It rises
Heat loss

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

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46. Superheat should never be below how many degrees
5 degrees
It will be high
A diffuser
RLA/FLA x 5

47. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
With a minimum of three evenly spaced self-tapping screws
Over/under and side by side
Pistons

48. Pressure in ductwork is measured In what?
S-clips and drives (cleats)
Slugging
6
Inches of water column (in. WC)

49. How many cfm per ton?
Potential relay and start capacitor
400
45-55%
Duct with insulation on the inside

50. What is the name of the fitting where the branch line leaves the duct?
Outside diameter (OD)
100
The takeoff fitting
Over 800 degrees F