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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. Where do you apply flux when soldering?
Yes
Outside of the male fitting
4
Belt drive and direct drive

2. Which is more efficient - a TXV or a fixed-orifice metering device?
Pull a vacuum
Individual return air systems and central return air systems
400
TXV

3. At what temperature will soft solder melt?
Static pressure - velocity pressure - and total pressure
With 4' saddles
Below 800 degrees F
It will have a decrease in superheat

4. What are the four materials used to make duct?
Stranded
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
100 psig
A piston type metering device

5. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
20 degrees F
45 degrees F
20 A
To lower the amount of pressure drop through the coil

6. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Latent and sensible
TXV
With 4' saddles

7. 9' round duct has a ballpark cfm of what?
300
True
45 degrees F
Yes

8. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
140 degrees F
Pull a vacuum
40 degrees F
8-12 degrees F

9. Where do you check the amps on a motor?
100
Pistons
On the common terminal
Duct with insulation on the inside

10. 13 SEER is classified as what kind of efficiency?
With an are rating
Nominal-sized tubing
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
High

11. What is the normal evaporator temperature?
40 A
To lower the amount of pressure drop through the coil
45 degrees F
2

12. Sections of duct board can be fastened together with what?
Staples and tape
It also rises
20 A
Pi x radius squared

13. How many BTU's per ton?
12000
S-clips and drives (cleats)
Latent and sensible
Positive

14. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A band 4 inches or more in width
15% silphos
A bypass duct or a dump zone
Potential relay and start capacitor

15. What are the three pressures created by moving air in ductwork?
4
When the system is under pressure
2
Static pressure - velocity pressure - and total pressure

16. If the rpm's are 1750 - how many poles does the motor have?
Inclined manometer
Common
4
1/4'

17. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Heat load
It will have a decrease in superheat
20 degrees above ambient
Individual return air systems and central return air systems

18. On what terminal do you check amperage?
Inclined manometer
Common
The suction line or the low-pressure side
A swaging tool

19. How do you calculate LRA?
RLA/FLA x 5
Over 800 degrees F
45-55%
6

20. 9' round duct has a ballpark cfm of what?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
300
150
TXV

21. What are the two types of return air systems in residential installations?
8
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
It will have a decrease in superheat
Individual return air systems and central return air systems

22. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
15% silphos
140 degrees F
Latent and sensible

23. What tool is used to expand the diameter of soft copper tubing
Below 800 degrees F
30-35 degrees above ambient
Heat load
A swaging tool

24. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Average feet per minute X area in square feet (H' x W'/144)
It will have a decrease in superheat
To lower the amount of pressure drop through the coil
When the system is under pressure

25. In what length rolls is soft copper tubing normally available?
No
300
Outside of the male fitting
25-ft or 50-ft

26. What are the three major power-consuming devices on an air-conditioning system?
20 A
It will have a decrease in superheat
Indoor fan motor - outdoor fan motor - and the compressor
Over 800 degrees F

27. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Yes
30 degrees F
Rise
It will be low

28. What gauge is thermostat wire?
18 gauge
It also rises
40 degrees F
Infiltration and ventilation

29. The furnace size is calculated by what?
Heat loss
40 degrees F
A piston type metering device
Potential relay and start capacitor

30. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Duct with insulation on the inside
It will be low
Belt drive and direct drive

31. 10' round duct has a ballpark cfm of what?
Btu/hr (output) / wattage (input)
Suction
When the system is under pressure
400

32. Do you need a vent on a pull-through evaporator?
Common
No
Yes
20 degrees F

33. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
40 degrees F
45-55%
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
In parallel

34. How many amps can 8 g wire handle?
Individual return air systems and central return air systems
40 A
True
Inches of water column (in. WC)

35. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
To remove humidity and lower dry bulb temperature
Indoor fan motor - outdoor fan motor - and the compressor
Yes

36. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
With a minimum of three evenly spaced self-tapping screws
300
A bypass duct or a dump zone
TXV

37. What are the four materials used to make duct?
It will be high
True
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A swaging tool

38. What do you use to check for leaks?
No
Nitrogen with a small amount of refrigerant
Pi x radius squared
2 minutes

39. Most duct insulation is made of what?
Pi x radius squared
Boil the liquid refrigerant out ot the oil within the crankcase
Positive
Fiberglass

40. 6' round duct has a ballpark cfm of what?
20 A
100
A bypass duct or a dump zone
SEER includes the energy used in the start-up and shut-down cycles

41. How do you calculate EER?
With a minimum of three evenly spaced self-tapping screws
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
300
Btu/hr (output) / wattage (input)

42. How do you calculate cfm?

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43. How many cfm per ton?
400
Boil the liquid refrigerant out ot the oil within the crankcase
When it is a pull-through evaporator
In parallel

44. The crankcase heater on an air-conditioning compressor is used to what?
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Boil the liquid refrigerant out ot the oil within the crankcase
140 degrees F

45. What are the three crafts normally associated with an air-conditioned installation?
Average feet per minute X area in square feet (H' x W'/144)
Pull a vacuum
Duct - electrical - and mechanical
L-type

46. What are the two basic duct connection configurations for package units supply and return air ducts?
Below 800 degrees F
Standard
Over/under and side by side
A band 4 inches or more in width

47. The fan switch opens at what temperature?
105 degrees F
TXV
It will be low
Rise

48. How will too much refrigerant effect subcooling?
45-55%
15% silphos
Heat load
It will be high

49. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
A bypass duct or a dump zone
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
TXV
40 degrees F

50. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
L-type
Pistons
SEER includes the energy used in the start-up and shut-down cycles
They are physically larger