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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 do you do after you braze a system?
Yes
In parallel
Yes
Pull a vacuum

2. At what temperature does refrigerant condense in a standard-efficiency unit?
Heat loss
20 degrees F
30-35 degrees above ambient
150

3. Do you need a vent on a pull-through evaporator?
2
Before the vent
Yes
400

4. A reciprocating compressor has what sort of moving parts?
Subtract ambient temperature from 100
Pistons
Individual return air systems and central return air systems
A piston type metering device

5. What is considered normal operating conditions?
In series
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pi x radius squared
18 gauge

6. Pressure in ductwork is measured In what?
100 psig
With an are rating
Pistons
Inches of water column (in. WC)

7. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
8-12 degrees F
Before the vent
30 degrees F

8. What are the two types of return air systems in residential installations?
Blended refrigerants
False
Duct - electrical - and mechanical
Individual return air systems and central return air systems

9. How are round ducts supported?

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10. 8' round duct has a ballpark cfm of what?
Vapor
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
200
SEER includes the energy used in the start-up and shut-down cycles

11. The compressor is cooled by liquid refrigerant. (True of False)
Boil the liquid refrigerant out ot the oil within the crankcase
150
False
Over/under and side by side

12. How many cfm per ton?
A dirty evaporator
The suction line or the low-pressure side
400
When it is above a conditioned space

13. What are the components of a hard-start kit?
They are larger
Potential relay and start capacitor
Yes
45 degrees F

14. Sections of duct board can be fastened together with what?
Inclined manometer
2 minutes
Staples and tape
400

15. At what temperature does refrigerant condense in a high-efficiency unit?
Yes
20 degrees above ambient
Compressor
Negative

16. The fan switch opens at what temperature?
TXV
It also rises
105 degrees F
In series

17. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
They are physically larger
40 degrees F
15% silphos
Duct - electrical - and mechanical

18. At what temperature will brazing melt?
With 4' saddles
By increasing the surface of the condenser coil
Over 800 degrees F
Shorted winding - open winding - and grounded winding

19. The fan switch opens at what temperature?
105 degrees F
SEER includes the energy used in the start-up and shut-down cycles
ACR (air-conditioning refrigeration) tubing
40 A

20. Where do you apply flux when soldering?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Over 800 degrees F
Outside of the male fitting
15 A

21. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
Suction
Vapor
Side-by-side and over-and-under

22. The A/C size is calculated by what?
Heat load
20 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
300

23. How will too much refrigerant effect superheat?
Infiltration and ventilation
When the system is under pressure
30-35 degrees above ambient
It will be low

24. If the rpm's are 1050 - how many poles does the motor have?
40 degrees F
Belt drive and direct drive
6
Yes

25. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Yes
30 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
45-55%

26. 10' round duct has a ballpark cfm of what?
Pi x radius squared
It will be low
Nitrogen with a small amount of refrigerant
400

27. What are the two functions of the air-conditioning system?
TXV
No
Compressor
To remove humidity and lower dry bulb temperature

28. Where is insulation used on copper tubing used for air-conditioning?
20 degrees above ambient
The suction line or the low-pressure side
Heat load
Dehydrated with caps on each end

29. What are the three major power-consuming devices on an air-conditioning system?
Compressor
Indoor fan motor - outdoor fan motor - and the compressor
15 A
400

30. The A/C size is calculated by what?
8-12 degrees F
Heat load
40 A
They are physically larger

31. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
Over 800 degrees F
Fiberglass
30 A

32. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
On the common terminal
L-type
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Inches of water column (in. WC)

33. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
When it is a pull-through evaporator
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Positive

34. If the rpm's are 1050 - how many poles does the motor have?
6
Slugging
Staples and tape
Slugging

35. What is lined duct?
Over/under and side by side
Nominal-sized tubing
In series
Duct with insulation on the inside

36. What kind of copper tubing is used for plumbing and heating applications?
They are larger
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Nominal-sized tubing
Outside diameter (OD)

37. 7' round duct has a ballpark cfm of what?
Yes
ACR (air-conditioning refrigeration) tubing
Pull a vacuum
150

38. How is the high pressure switch wired with the low pressure switch?
In parallel
Belt drive and direct drive
S-clips and drives (cleats)
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

39. How are the condenser coils different on a high-efficiency unit?
Heat loss
They are larger
40 degrees F
Yes

40. What distributes supply air to a room in a structure?
A diffuser
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
A dirty evaporator

41. Where do you apply flux when soldering?
Outside of the male fitting
To lower the amount of pressure drop through the coil
L-type
A band 4 inches or more in width

42. If pressure rises - what happens to the superheat?
The suction line or the low-pressure side
It rises
With a minimum of three evenly spaced self-tapping screws
40 A

43. What can cause a decrease in suction pressure on an air-conditioning system?
Negative
Outside diameter (OD)
A dirty evaporator
40 degrees F

44. Most duct insulation is made of what?
20 degrees above ambient
S-clips and drives (cleats)
True
Fiberglass

45. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
RLA/FLA x 5
The suction line or the low-pressure side
25-ft or 50-ft

46. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Inside diameter (ID)
300
Duct with insulation on the inside
30 degrees F

47. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Btu/hr (output) / wattage (input)
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

48. The fan switch closes at what temperature?
Before the vent
Belt drive and direct drive
Blended refrigerants
140 degrees F

49. What gauge is thermostat wire?
By increasing the surface of the condenser coil
45-55%
Outside diameter (OD)
18 gauge

50. What are the components of a hard-start kit?
Negative
In series
Potential relay and start capacitor
Subtract ambient temperature from 100