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Residential Air Conditioning

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. At what temperature will brazing melt?
2
Rise
Over 800 degrees F
The suction line or the low-pressure side

2. What are the two types of package units?
8-12 degrees F
Yes
Side-by-side and over-and-under
Slugging

3. Will a dirty condenser cause a rise or fall in pressure?
Rise
100
Side-by-side and over-and-under
Potential relay and start capacitor

4. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
A bypass duct or a dump zone
Outside diameter (OD)
Yes
30 degrees F

5. Do you need a trap on a pull-through evaporator?
Below 800 degrees F
Heat loss
Yes
S-clips and drives (cleats)

6. If the rpm's are 1050 - how many poles does the motor have?
6
Average feet per minute X area in square feet (H' x W'/144)
105 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

7. How do you calculate EER?
Inches of water column (in. WC)
Btu/hr (output) / wattage (input)
Duct with insulation on the inside
On the common terminal

8. What kind of copper tubing is used for plumbing and heating applications?
Infiltration and ventilation
Yes
Nominal-sized tubing
Dehydrated with caps on each end

9. What are the four materials used to make duct?
1/4'
Pistons
150
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

10. How will too much refrigerant effect subcooling?
Nitrogen with a small amount of refrigerant
It will be high
5 degrees
Pi x radius squared

11. What percentage silver do you need to use for an are-410 system?
Static pressure - velocity pressure - and total pressure
15% silphos
On the common terminal
L-type

12. Which type of wire can handle a higher ampacity?
A diffuser
5 degrees
Stranded
400

13. Can refrigerant line sets be altered in length?
With 4' saddles
4
Yes
TXV

14. The fan switch closes at what temperature?
2
140 degrees F
Heat loss
Inclined manometer

15. How is flexible duct supported?
Any amount
They are physically larger
A band 4 inches or more in width
True

16. How do you calculate LRA?
RLA/FLA x 5
40 A
Static pressure - velocity pressure - and total pressure
140 degrees F

17. How do you calculate ballpark superheat?
Pull a vacuum
With an are rating
Subtract ambient temperature from 100
Potential relay and start capacitor

18. What are the two basic duct connection configurations for package units supply and return air ducts?
In series
False
Over/under and side by side
Standard

19. How is ACR tubing sized?
Outside diameter (OD)
Staples and tape
30 A
Inches of water column (in. WC)

20. 9' round duct has a ballpark cfm of what?
300
Yes
40 A
Before the vent

21. If the suction pressure rises - what happens to the head pressure?
6
A diffuser
It also rises
Outside diameter (OD)

22. When must a copper joint never be soldered or brazed?
20 A
Subtract ambient temperature from 100
When the system is under pressure
Static pressure - velocity pressure - and total pressure

23. What is it called when liquid refrigerant gets into the compressor?
It rises
It will have a decrease in superheat
Slugging
TXV

24. What distributes supply air to a room in a structure?
It also rises
Belt drive and direct drive
A diffuser
It rises

25. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Boil the liquid refrigerant out ot the oil within the crankcase
High
18 gauge

26. The load on the evaporater will effect which pressure?
It will be high
Vapor
Suction
12000

27. What are the two types of package units?
Side-by-side and over-and-under
140 degrees F
Heat load
Negative

28. When do you install a trap on a drain line?
18 gauge
When it is a pull-through evaporator
When it is above a conditioned space
40 degrees F

29. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Outside diameter (OD)
S-clips and drives (cleats)
It will have a decrease in superheat
Suction

30. The load on the evaporater will effect which pressure?
200
Suction
False
Standard

31. 10' round duct has a ballpark cfm of what?
2 minutes
In series
Average feet per minute X area in square feet (H' x W'/144)
400

32. 7' round duct has a ballpark cfm of what?
5 degrees
4
150
SEER includes the energy used in the start-up and shut-down cycles

33. What are normal conditions - as defined by the ARI.
Below 800 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Over/under and side by side
Btu/hr (output) / wattage (input)

34. How are the condenser coils different on a high-efficiency unit?
They are larger
Pi x radius squared
With 4' saddles
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

35. How does ACR copper pipe come?
Yes
RLA/FLA x 5
High
Dehydrated with caps on each end

36. At what temperature will soft solder melt?
By increasing the surface of the condenser coil
200
Suction
Below 800 degrees F

37. What is the design boiling point for most evaporator coils in residential air conditioning?
Over/under and side by side
140 degrees F
High
40 degrees F

38. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
4
6
A bypass duct or a dump zone

39. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
200
TXV
Heat loss

40. How are round ducts supported?

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41. How many amps can 14 g wire handle?
15 A
Indoor fan motor - outdoor fan motor - and the compressor
Pull a vacuum
False

42. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Any amount
30 A
L-type
Inside diameter (ID)

43. What are the three pressures created by moving air in ductwork?
Slugging
Pistons
Compressor
Static pressure - velocity pressure - and total pressure

44. How is insulation around a duct rated?
45-55%
With an are rating
Inclined manometer
A diffuser

45. A reciprocating compressor has what sort of moving parts?
When it is a pull-through evaporator
Pistons
Individual return air systems and central return air systems
A bypass duct or a dump zone

46. Do you need a trap on a push-through evaporator?
18 gauge
In series
No
Individual return air systems and central return air systems

47. What are normal conditions - as defined by the ARI.
They are larger
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

48. What kind of copper tubing is used for plumbing and heating applications?
To lower the amount of pressure drop through the coil
With 4' saddles
Nominal-sized tubing
200

49. 9' round duct has a ballpark cfm of what?
300
A swaging tool
Individual return air systems and central return air systems
2

50. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
In parallel
100
Pull a vacuum

Can you answer 50 questions in 15 minutes?

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Residential Air Conditioning

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