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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 are the two ways that fresh air enters a structure?
Infiltration and ventilation
150
A swaging tool
It rises

2. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
The takeoff fitting
140 degrees F
It will have a decrease in superheat
A bypass duct or a dump zone

3. What is it called when liquid refrigerant gets into the compressor?
Potential relay and start capacitor
Slugging
20 degrees above ambient
It will be high

4. The evaporator is designed to remove what two types of heat?
45-55%
A piston type metering device
2
Latent and sensible

5. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
It will be high
400
With a minimum of three evenly spaced self-tapping screws

6. What type of air conditioning system must be charged using the superheat method?
Stranded
Dehydrated with caps on each end
A piston type metering device
40 A

7. If the rpm's are 3450 - how many poles does the motor have?
2
Average feet per minute X area in square feet (H' x W'/144)
400
High

8. Do you need a vent on a pull-through evaporator?
Over/under and side by side
Suction
Yes
Suction

9. What are the two types of blower drives?
It will be high
105 degrees F
Belt drive and direct drive
20 degrees F

10. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
When it is above a conditioned space
Inches of water column (in. WC)
Individual return air systems and central return air systems

11. Where do you apply flux when soldering?
Heat load
Blended refrigerants
Over/under and side by side
Outside of the male fitting

12. The fan switch opens at what temperature?
105 degrees F
Duct with insulation on the inside
Potential relay and start capacitor
Infiltration and ventilation

13. Superheat should never be below how many degrees
Potential relay and start capacitor
5 degrees
Suction
Average feet per minute X area in square feet (H' x W'/144)

14. How long should you leave a system off once you kill power before restarting it?
2 minutes
A diffuser
It will be low
When the system is under pressure

15. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
30 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
It will have a decrease in superheat
Nitrogen with a small amount of refrigerant

16. How are round ducts connected to one another?
With 4' saddles
With a minimum of three evenly spaced self-tapping screws
6
A band 4 inches or more in width

17. What is a package unit?
Infiltration and ventilation
Static pressure - velocity pressure - and total pressure
Any amount
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

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

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19. How are the condenser coils different on a high-efficiency unit?
18 gauge
140 degrees F
Side-by-side and over-and-under
They are larger

20. How is insulation around a duct rated?
45 degrees F
The takeoff fitting
With an are rating
It rises

21. What is the difference between SEER and EER?
When it is a pull-through evaporator
Shorted winding - open winding - and grounded winding
The takeoff fitting
SEER includes the energy used in the start-up and shut-down cycles

22. How do you calculate ballpark superheat?
12000
Subtract ambient temperature from 100
Btu/hr (output) / wattage (input)
RLA/FLA x 5

23. On what terminal do you check amperage?
Common
400
Over 800 degrees F
Outside diameter (OD)

24. What tool is used to expand the diameter of soft copper tubing
It will be high
It rises
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
A swaging tool

25. At what temperature will soft solder melt?
Below 800 degrees F
300
20 A
Slugging

26. The compressor is cooled by liquid refrigerant. (True of False)
Staples and tape
300
False
15 A

27. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Over 800 degrees F
100
When the system is under pressure
True

28. 10' round duct has a ballpark cfm of what?
Static pressure - velocity pressure - and total pressure
400
Outside diameter (OD)
Rise

29. Pressure in ductwork is measured In what?
It will be low
Inches of water column (in. WC)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Duct with insulation on the inside

30. When do you install an auxillary drain pan?
When it is above a conditioned space
False
It will be high
Yes

31. How do you calculate the area of a circle?
Pi x radius squared
Pistons
It also rises
100

32. What kind of copper tubing is used for plumbing and heating applications?
Inches of water column (in. WC)
False
Nominal-sized tubing
15 A

33. What are the three major power-consuming devices on an air-conditioning system?
On the common terminal
Yes
Indoor fan motor - outdoor fan motor - and the compressor
High

34. Do you need a trap on a push-through evaporator?
A dirty evaporator
200
8
No

35. What kind of metering device do high-efficiency units usually use?
High
TXV
15 A
1/4'

36. How do you calculate LRA?
45 degrees F
100
On the common terminal
RLA/FLA x 5

37. What can cause a decrease in suction pressure on an air-conditioning system?
Pull a vacuum
8-12 degrees F
A dirty evaporator
400

38. What do you do after you braze a system?
Pull a vacuum
S-clips and drives (cleats)
It will be high
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

39. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
True
15% silphos
A bypass duct or a dump zone
30 degrees F

40. The furnace size is calculated by what?
2 minutes
Heat loss
Duct with insulation on the inside
300

41. Why are some ACR tubing lines insulated?
Yes
A dirty evaporator
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
40 degrees F

42. If the rpm's are 1750 - how many poles does the motor have?
Static pressure - velocity pressure - and total pressure
Infiltration and ventilation
8-12 degrees F
4

43. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Heat load
Suction
400
They are physically larger

44. How many amps can 8 g wire handle?
A bypass duct or a dump zone
40 A
105 degrees F
Belt drive and direct drive

45. How is ACR tubing sized?
The takeoff fitting
Outside diameter (OD)
S-clips and drives (cleats)
By increasing the surface of the condenser coil

46. At what temperature will soft solder melt?
L-type
Below 800 degrees F
Duct - electrical - and mechanical
TXV

47. The crankcase heater on an air-conditioning compressor is used to what?
Fiberglass
Boil the liquid refrigerant out ot the oil within the crankcase
Potential relay and start capacitor
2

48. If the rpm's are 1050 - how many poles does the motor have?
6
Side-by-side and over-and-under
Standard
Subtract ambient temperature from 100

49. If the rpm's are 750 - how many poles does the motor have?
400
Over/under and side by side
8
Compressor

50. If the suction pressure rises - what happens to the head pressure?
No
Btu/hr (output) / wattage (input)
It also rises
Negative