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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. How do you calculate cfm?

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2. What percentage silver do you need to use for an are-410 system?
To lower the amount of pressure drop through the coil
When it is a pull-through evaporator
Individual return air systems and central return air systems
15% silphos

3. How do you calculate EER?
Yes
Boil the liquid refrigerant out ot the oil within the crankcase
300
Btu/hr (output) / wattage (input)

4. When must a copper joint never be soldered or brazed?
150
When the system is under pressure
Yes
100

5. How many amps can 10 g wire handle?
In series
To lower the amount of pressure drop through the coil
30 A
On the common terminal

6. In what length rolls is soft copper tubing normally available?
Yes
25-ft or 50-ft
Rise
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

7. The load on the evaporater will effect which pressure?
200
Suction
It will be high
Average feet per minute X area in square feet (H' x W'/144)

8. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
400
When it is a pull-through evaporator
200

9. The fan switch closes at what temperature?
Over/under and side by side
140 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
It will be high

10. 10' round duct has a ballpark cfm of what?
Subtract ambient temperature from 100
400
Rise
ACR (air-conditioning refrigeration) tubing

11. Do you need a vent on a push-through evaporator?
30 A
Yes
A swaging tool
Dehydrated with caps on each end

12. How is the high pressure switch wired with the low pressure switch?
L-type
Pull a vacuum
To remove humidity and lower dry bulb temperature
In parallel

13. What is a package unit?
100 psig
On the common terminal
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
When the system is under pressure

14. If the rpm's are 3450 - how many poles does the motor have?
Suction
On the common terminal
300
2

15. How is flexible duct supported?
Duct with insulation on the inside
A band 4 inches or more in width
It rises
Rise

16. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Blended refrigerants
In series
Before the vent
It will have a decrease in superheat

17. What kind of refrigeratnts must be added in liquid form?
4
It will be low
Blended refrigerants
30 A

18. How is nominal-sized tubing sized?
Inside diameter (ID)
Belt drive and direct drive
To remove humidity and lower dry bulb temperature
Infiltration and ventilation

19. How many BTU's per ton?
Vapor
30 degrees F
Staples and tape
12000

20. 10 SEER is classified as what kind of efficiency?
Side-by-side and over-and-under
Standard
Yes
8-12 degrees F

21. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
Shorted winding - open winding - and grounded winding
Rise
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

22. What are the three ways a motor can fail electrically?
Side-by-side and over-and-under
Shorted winding - open winding - and grounded winding
RLA/FLA x 5
Vapor

23. What sort of pressure will a push-through evaporator have?
Yes
To remove humidity and lower dry bulb temperature
Fiberglass
Positive

24. What is considered normal operating conditions?
12000
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Compressor
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

25. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
100 psig
Shorted winding - open winding - and grounded winding
They are larger

26. What sort of pressure will a pull-through evaporator have?
Negative
Yes
Yes
30 degrees F

27. What are the two functions of the air-conditioning system?
A diffuser
To remove humidity and lower dry bulb temperature
30 A
It will be high

28. If the rpm's are 1750 - how many poles does the motor have?
Inclined manometer
Duct with insulation on the inside
4
High

29. Where do you install a trap on a drain line?
Any amount
6
1/4'
Before the vent

30. In what state is the refrigerant in the compressor?
Vapor
When the system is under pressure
Nominal-sized tubing
300

31. How does ACR copper pipe come?
Pull a vacuum
Stranded
20 degrees F
Dehydrated with caps on each end

32. What sort of pressure will a pull-through evaporator have?
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Negative
A swaging tool

33. How do you calculate LRA?
Shorted winding - open winding - and grounded winding
40 degrees F
RLA/FLA x 5
Positive

34. What can cause a decrease in suction pressure on an air-conditioning system?
Static pressure - velocity pressure - and total pressure
8-12 degrees F
Belt drive and direct drive
A dirty evaporator

35. How many cfm per ton?
A swaging tool
5 degrees
400
Rise

36. If the rpm's are 750 - how many poles does the motor have?
Standard
Side-by-side and over-and-under
40 degrees F
8

37. How are round ducts supported?

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38. What is the normal evaporator temperature?
45 degrees F
Belt drive and direct drive
Individual return air systems and central return air systems
25-ft or 50-ft

39. Do you need a vent on a pull-through evaporator?
30 A
S-clips and drives (cleats)
15% silphos
Yes

40. What do you use to check for leaks?
Boil the liquid refrigerant out ot the oil within the crankcase
Nitrogen with a small amount of refrigerant
It also rises
By increasing the surface of the condenser coil

41. 8' round duct has a ballpark cfm of what?
200
In series
Below 800 degrees F
Negative

42. 8' round duct has a ballpark cfm of what?
30 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
200
TXV

43. What are the two ways that fresh air enters a structure?
TXV
Infiltration and ventilation
Inclined manometer
300

44. At what temperature will soft solder melt?
12000
High
Below 800 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

45. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
40 degrees F
Stranded
30 degrees F
Any amount

46. What is the name of the fitting where the branch line leaves the duct?
Over/under and side by side
Compressor
The takeoff fitting
Below 800 degrees F

47. How do you calculate the area of a circle?
A band 4 inches or more in width
Any amount
Below 800 degrees F
Pi x radius squared

48. The furnace size is calculated by what?
Btu/hr (output) / wattage (input)
Heat loss
Below 800 degrees F
To lower the amount of pressure drop through the coil

49. How do you calculate the area of a circle?
8
Compressor
Pi x radius squared
Nominal-sized tubing

50. Which type of wire can handle a higher ampacity?
40 degrees F
Stranded
Over/under and side by side
Inside diameter (ID)