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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 is the design boiling point for most evaporator coils in residential air conditioning?
Duct with insulation on the inside
Potential relay and start capacitor
With an are rating
40 degrees F

2. How many cfm per ton?
400
40 degrees F
Standard
It will have a decrease in superheat

3. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
30 degrees F
S-clips and drives (cleats)
45 degrees F

4. How are round ducts supported?

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5. What is the typical pressure differance across a TXV?
100 psig
Below 800 degrees F
Negative
With a minimum of three evenly spaced self-tapping screws

6. Which is more efficient - a TXV or a fixed-orifice metering device?
40 A
Pi x radius squared
TXV
Compressor

7. On what terminal do you check amperage?
Infiltration and ventilation
In parallel
L-type
Common

8. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Inches of water column (in. WC)
With a minimum of three evenly spaced self-tapping screws
45-55%
When it is a pull-through evaporator

9. How many amps can 14 g wire handle?
Yes
Btu/hr (output) / wattage (input)
15 A
Outside of the male fitting

10. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Average feet per minute X area in square feet (H' x W'/144)
Individual return air systems and central return air systems
5 degrees
20 degrees F

11. What percentage silver do you need to use for an are-410 system?
Infiltration and ventilation
Vapor
15% silphos
Negative

12. How does ACR copper pipe come?
Dehydrated with caps on each end
20 degrees F
It also rises
40 degrees F

13. How do you calculate the area of a circle?
By increasing the surface of the condenser coil
30 degrees F
A piston type metering device
Pi x radius squared

14. What are the two ways that fresh air enters a structure?
Any amount
Infiltration and ventilation
45-55%
With 4' saddles

15. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Before the vent
400
On the common terminal

16. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Stranded
The suction line or the low-pressure side
To lower the amount of pressure drop through the coil
Yes

17. What do you do after you braze a system?
40 A
It rises
Btu/hr (output) / wattage (input)
Pull a vacuum

18. The crankcase heater on an air-conditioning compressor is used to what?
Staples and tape
Boil the liquid refrigerant out ot the oil within the crankcase
In parallel
They are larger

19. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
A piston type metering device
Suction
Pistons
They are physically larger

20. 8' round duct has a ballpark cfm of what?
Duct - electrical - and mechanical
150
4
200

21. Do you need a vent on a push-through evaporator?
Pistons
105 degrees F
400
Yes

22. How long should you leave a system off once you kill power before restarting it?
2 minutes
Compressor
20 A
15% silphos

23. A reciprocating compressor has what sort of moving parts?
They are physically larger
They are larger
Pistons
Outside diameter (OD)

24. When do you install a trap on a drain line?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
400
Blended refrigerants
When it is a pull-through evaporator

25. What are the two types of package units?
25-ft or 50-ft
On the common terminal
Side-by-side and over-and-under
Inclined manometer

26. At what temperature will brazing melt?
1/4'
High
Over 800 degrees F
Indoor fan motor - outdoor fan motor - and the compressor

27. What gauge is thermostat wire?
18 gauge
They are larger
It will be low
4

28. What are the two basic duct connection configurations for package units supply and return air ducts?
In parallel
6
Blended refrigerants
Over/under and side by side

29. The A/C size is calculated by what?
Suction
Heat load
It will be high
Before the vent

30. The furnace size is calculated by what?
Heat loss
Nitrogen with a small amount of refrigerant
40 degrees F
200

31. At what temperature does refrigerant condense in a standard-efficiency unit?
45 degrees F
It will have a decrease in superheat
30-35 degrees above ambient
False

32. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Negative
20 A
40 degrees F
2 minutes

33. What tool is used to expand the diameter of soft copper tubing
30 A
A swaging tool
When the system is under pressure
45 degrees F

34. If the rpm's are 3450 - how many poles does the motor have?
Duct - electrical - and mechanical
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
In series
2

35. At what temperature does refrigerant condense in a high-efficiency unit?
Outside diameter (OD)
8
20 degrees above ambient
25-ft or 50-ft

36. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
45 degrees F
L-type
SEER includes the energy used in the start-up and shut-down cycles

37. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
True
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Stranded

38. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Common
Inches of water column (in. WC)
150

39. What are the two ways that fresh air enters a structure?
Side-by-side and over-and-under
Infiltration and ventilation
Average feet per minute X area in square feet (H' x W'/144)
6

40. Where is insulation used on copper tubing used for air-conditioning?
SEER includes the energy used in the start-up and shut-down cycles
The suction line or the low-pressure side
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
200

41. How does ACR copper pipe come?
25-ft or 50-ft
Inches of water column (in. WC)
Standard
Dehydrated with caps on each end

42. What are the components of a hard-start kit?
Potential relay and start capacitor
Btu/hr (output) / wattage (input)
Yes
A piston type metering device

43. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Yes
Any amount
Potential relay and start capacitor

44. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
Indoor fan motor - outdoor fan motor - and the compressor
No
Negative

45. Can refrigerant line sets be altered in length?
Yes
Dehydrated with caps on each end
140 degrees F
Individual return air systems and central return air systems

46. What kind of metering device do high-efficiency units usually use?
Negative
Yes
TXV
Btu/hr (output) / wattage (input)

47. What kind of refrigeratnts must be added in liquid form?
4
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants
Subtract ambient temperature from 100

48. If the rpm's are 1750 - how many poles does the motor have?
30-35 degrees above ambient
4
SEER includes the energy used in the start-up and shut-down cycles
To remove humidity and lower dry bulb temperature

49. What is the normal evaporator temperature?
Duct with insulation on the inside
45 degrees F
100 psig
When the system is under pressure

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

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