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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. 7' round duct has a ballpark cfm of what?
Yes
150
Latent and sensible
Suction

2. What are the three major power-consuming devices on an air-conditioning system?
Side-by-side and over-and-under
Indoor fan motor - outdoor fan motor - and the compressor
It will have a decrease in superheat
100

3. What are normal conditions - as defined by the ARI.
Rise
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Outside of the male fitting
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

4. Will a dirty condenser cause a rise or fall in pressure?
20 A
Rise
They are larger
Standard

5. At what temperature will brazing melt?
Compressor
30 A
Any amount
Over 800 degrees F

6. The load on the evaporater will effect which pressure?
Nitrogen with a small amount of refrigerant
Suction
In parallel
ACR (air-conditioning refrigeration) tubing

7. What are the two types of package units?
It will be high
Side-by-side and over-and-under
Slugging
Average feet per minute X area in square feet (H' x W'/144)

8. What can cause a decrease in suction pressure on an air-conditioning system?
A swaging tool
A dirty evaporator
Compressor
Staples and tape

9. How many cfm per ton?
400
15% silphos
Duct with insulation on the inside
Inches of water column (in. WC)

10. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
Outside diameter (OD)
Slugging
Yes

11. What type of air conditioning system must be charged using the superheat method?
140 degrees F
With 4' saddles
A piston type metering device
Shorted winding - open winding - and grounded winding

12. How is nominal-sized tubing sized?
RLA/FLA x 5
5 degrees
Inside diameter (ID)
In series

13. Where do you check the amps on a motor?
High
On the common terminal
400
8-12 degrees F

14. Sections of duct board can be fastened together with what?
Pistons
Potential relay and start capacitor
Dehydrated with caps on each end
Staples and tape

15. What kind of copper tubing is used for refrigeration or air-conditioning applications?
30-35 degrees above ambient
ACR (air-conditioning refrigeration) tubing
Heat load
2

16. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
It also rises
300
Indoor fan motor - outdoor fan motor - and the compressor

17. What are the two types of blower drives?
Stranded
Yes
Belt drive and direct drive
2 minutes

18. What are the three ways a motor can fail electrically?
False
In parallel
Outside diameter (OD)
Shorted winding - open winding - and grounded winding

19. Can refrigerant line sets be altered in length?
15 A
5 degrees
Yes
A bypass duct or a dump zone

20. Superheat should never be below how many degrees
5 degrees
30 A
It will be low
Latent and sensible

21. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
S-clips and drives (cleats)
100 psig
8

22. Why are some ACR tubing lines insulated?
25-ft or 50-ft
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
30-35 degrees above ambient
They are physically larger

23. What is considered normal operating conditions?
Potential relay and start capacitor
To lower the amount of pressure drop through the coil
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

24. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
The suction line or the low-pressure side
Shorted winding - open winding - and grounded winding
40 degrees F
20 degrees F

25. What sort of pressure will a push-through evaporator have?
Vapor
Positive
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
40 A

26. Where do you install a trap on a drain line?
Before the vent
RLA/FLA x 5
TXV
A band 4 inches or more in width

27. When do you install an auxillary drain pan?
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
When it is above a conditioned space
Infiltration and ventilation

28. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
45-55%
20 degrees F
Pull a vacuum

29. What kind of metering device do high-efficiency units usually use?
TXV
Duct - electrical - and mechanical
Pi x radius squared
Shorted winding - open winding - and grounded winding

30. Why are some ACR tubing lines insulated?
In parallel
To remove humidity and lower dry bulb temperature
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It rises

31. Which type of wire can handle a higher ampacity?
With a minimum of three evenly spaced self-tapping screws
Stranded
Heat loss
5 degrees

32. When must a copper joint never be soldered or brazed?
SEER includes the energy used in the start-up and shut-down cycles
When the system is under pressure
By increasing the surface of the condenser coil
Pull a vacuum

33. How do you achieve high-efficiency?
Outside of the male fitting
Blended refrigerants
By increasing the surface of the condenser coil
With an are rating

34. 8' round duct has a ballpark cfm of what?
5 degrees
Slugging
200
Potential relay and start capacitor

35. The fan switch opens at what temperature?
105 degrees F
Duct with insulation on the inside
Boil the liquid refrigerant out ot the oil within the crankcase
15 A

36. How long should you leave a system off once you kill power before restarting it?
30 A
Over/under and side by side
Heat load
2 minutes

37. How are round ducts supported?

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38. What is the range for normal superheat and subcooling?
The takeoff fitting
To remove humidity and lower dry bulb temperature
8-12 degrees F
A dirty evaporator

39. Will a dirty condenser cause a rise or fall in pressure?
Rise
Subtract ambient temperature from 100
False
Before the vent

40. What is a package unit?
12000
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
8-12 degrees F
With a minimum of three evenly spaced self-tapping screws

41. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
True
L-type
Yes
8-12 degrees F

42. Pressure in ductwork is measured In what?
It also rises
Inches of water column (in. WC)
RLA/FLA x 5
Subtract ambient temperature from 100

43. What distributes supply air to a room in a structure?
A diffuser
Belt drive and direct drive
Any amount
Below 800 degrees F

44. Pressure in ductwork is measured In what?
Shorted winding - open winding - and grounded winding
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Inclined manometer
Inches of water column (in. WC)

45. What is the difference between SEER and EER?
False
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
SEER includes the energy used in the start-up and shut-down cycles
Nominal-sized tubing

46. What are the components of a hard-start kit?
Nitrogen with a small amount of refrigerant
Fiberglass
18 gauge
Potential relay and start capacitor

47. The crankcase heater on an air-conditioning compressor is used to what?
Inches of water column (in. WC)
Boil the liquid refrigerant out ot the oil within the crankcase
20 degrees above ambient
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

48. At what temperature does refrigerant condense in a high-efficiency unit?
Slugging
20 degrees above ambient
Blended refrigerants
It will have a decrease in superheat

49. Do you need a trap on a pull-through evaporator?
Yes
Rise
It will be high
Infiltration and ventilation

50. On what terminal do you check amperage?
In parallel
When it is above a conditioned space
Common
Nominal-sized tubing