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Residential Air Conditioning

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. What is it called when liquid refrigerant gets into the compressor?
With a minimum of three evenly spaced self-tapping screws
Pi x radius squared
Slugging
Any amount

2. How do you calculate LRA?
A dirty evaporator
100 psig
Infiltration and ventilation
RLA/FLA x 5

3. How many amps can 12 g wire handle?
TXV
15 A
20 A
Belt drive and direct drive

4. What is considered normal operating conditions?
Inclined manometer
Boil the liquid refrigerant out ot the oil within the crankcase
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
When it is above a conditioned space

5. 7' round duct has a ballpark cfm of what?
Inclined manometer
Belt drive and direct drive
150
It will be high

6. How many amps can 8 g wire handle?
45 degrees F
Negative
40 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

7. Sections of duct board can be fastened together with what?
Staples and tape
100 psig
30 A
Belt drive and direct drive

8. What are the four materials used to make duct?
40 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes
100 psig

9. If the suction pressure rises - what happens to the head pressure?
400
A piston type metering device
Duct - electrical - and mechanical
It also rises

10. What distributes supply air to a room in a structure?
20 degrees F
45-55%
Boil the liquid refrigerant out ot the oil within the crankcase
A diffuser

11. At what temperature does refrigerant condense in a high-efficiency unit?
The suction line or the low-pressure side
Below 800 degrees F
Stranded
20 degrees above ambient

12. At what temperature will soft solder melt?
Below 800 degrees F
Compressor
30 degrees F
30-35 degrees above ambient

13. How do you calculate ballpark superheat?
L-type
No
Subtract ambient temperature from 100
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

14. What component changes refrigerant from a low pressure gas to a high pressure gas?
It will be low
In series
Pistons
Compressor

15. A reciprocating compressor has what sort of moving parts?
Pistons
Yes
Suction
A diffuser

16. Do you need a vent on a pull-through evaporator?
Pull a vacuum
A dirty evaporator
Yes
45 degrees F

17. How many amps can 14 g wire handle?
Pull a vacuum
Rise
15 A
2

18. Which type of wire can handle a higher ampacity?
30 degrees F
Stranded
High
On the common terminal

19. On what terminal do you check amperage?
Yes
A bypass duct or a dump zone
Shorted winding - open winding - and grounded winding
Common

20. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
2 minutes
2
1/4'

21. Where do you apply flux when soldering?
It will be high
Outside of the male fitting
140 degrees F
TXV

22. What kind of copper tubing is used for plumbing and heating applications?
Standard
Nominal-sized tubing
100 psig
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

23. What do you do after you braze a system?
Staples and tape
25-ft or 50-ft
Pull a vacuum
Nominal-sized tubing

24. What is the range for normal superheat and subcooling?
8-12 degrees F
Stranded
200
Positive

25. What distributes supply air to a room in a structure?
Duct - electrical - and mechanical
The takeoff fitting
A diffuser
100 psig

26. What kind of copper tubing is used for refrigeration or air-conditioning applications?
False
40 degrees F
ACR (air-conditioning refrigeration) tubing
Negative

27. How is ACR tubing sized?
Outside diameter (OD)
Fiberglass
ACR (air-conditioning refrigeration) tubing
Potential relay and start capacitor

28. What gauge is thermostat wire?
RLA/FLA x 5
Slugging
18 gauge
Belt drive and direct drive

29. How does ACR copper pipe come?
To remove humidity and lower dry bulb temperature
Infiltration and ventilation
Dehydrated with caps on each end
Latent and sensible

30. What is considered normal operating conditions?
Side-by-side and over-and-under
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Latent and sensible
In parallel

31. What sort of pressure will a pull-through evaporator have?
Yes
Pi x radius squared
A bypass duct or a dump zone
Negative

32. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
RLA/FLA x 5
Side-by-side and over-and-under
Staples and tape

33. Where do you check the amps on a motor?
105 degrees F
On the common terminal
Subtract ambient temperature from 100
200

34. If the rpm's are 3450 - how many poles does the motor have?
Dehydrated with caps on each end
2
A bypass duct or a dump zone
When the system is under pressure

35. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
They are physically larger
TXV
Outside diameter (OD)

36. What type of air conditioning system must be charged using the superheat method?
It will have a decrease in superheat
18 gauge
Suction
A piston type metering device

37. The fan switch closes at what temperature?
140 degrees F
When the system is under pressure
30 degrees F
Stranded

38. How long should you leave a system off once you kill power before restarting it?
2 minutes
It rises
By increasing the surface of the condenser coil
40 A

39. What are the three pressures created by moving air in ductwork?
Suction
12000
Fiberglass
Static pressure - velocity pressure - and total pressure

40. Can refrigerant line sets be altered in length?
Rise
Yes
Shorted winding - open winding - and grounded winding
Slugging

41. How many amps can 10 g wire handle?
30 A
Outside diameter (OD)
Below 800 degrees F
Yes

42. How will too much refrigerant effect superheat?
45 degrees F
It will be low
25-ft or 50-ft
15 A

43. What are the three major power-consuming devices on an air-conditioning system?
Outside diameter (OD)
Indoor fan motor - outdoor fan motor - and the compressor
Suction
Over 800 degrees F

44. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
Yes
140 degrees F
TXV

45. How do you calculate cfm?

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46. What percentage silver do you need to use for an are-410 system?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Static pressure - velocity pressure - and total pressure
When it is above a conditioned space
15% silphos

47. How do you calculate the area of a circle?
The suction line or the low-pressure side
With an are rating
Pi x radius squared
A bypass duct or a dump zone

48. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
True
Rise
Dehydrated with caps on each end

49. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
Over/under and side by side
300
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

50. What is a package unit?
18 gauge
Staples and tape
Duct - electrical - and mechanical
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

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Residential Air Conditioning

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