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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 is lined duct?
Duct with insulation on the inside
Pi x radius squared
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When it is above a conditioned space

2. Sections of duct board can be fastened together with what?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
140 degrees F
It also rises
Staples and tape

3. Will a dirty condenser cause a rise or fall in pressure?
A bypass duct or a dump zone
Rise
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
No

4. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Below 800 degrees F
L-type
100 psig
12000

5. What type of air conditioning system must be charged using the superheat method?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Heat load
A piston type metering device
Negative

6. How long should you leave a system off once you kill power before restarting it?
L-type
It will be high
2 minutes
Outside of the male fitting

7. How do you calculate cfm?

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8. What percentage silver do you need to use for an are-410 system?
With 4' saddles
8-12 degrees F
Standard
15% silphos

9. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
2
Any amount
20 degrees F
False

10. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Inside diameter (ID)
2
Suction
To lower the amount of pressure drop through the coil

11. How many amps can 8 g wire handle?
40 A
Vapor
45-55%
45 degrees F

12. How do you achieve high-efficiency?
100
By increasing the surface of the condenser coil
L-type
With 4' saddles

13. 10 SEER is classified as what kind of efficiency?
Standard
Rise
25-ft or 50-ft
100

14. What can cause a decrease in suction pressure on an air-conditioning system?
Positive
Inches of water column (in. WC)
A dirty evaporator
Average feet per minute X area in square feet (H' x W'/144)

15. What are normal conditions - as defined by the ARI.
Any amount
Negative
Heat load
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

16. What do you do after you braze a system?
Pull a vacuum
Belt drive and direct drive
Btu/hr (output) / wattage (input)
Yes

17. If the rpm's are 1050 - how many poles does the motor have?
Inches of water column (in. WC)
Heat load
6
30 degrees F

18. What are the two types of return air systems in residential installations?
They are larger
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Pull a vacuum
Individual return air systems and central return air systems

19. Why are some ACR tubing lines insulated?
When it is a pull-through evaporator
Inside diameter (ID)
Shorted winding - open winding - and grounded winding
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

20. What is the range for normal superheat and subcooling?
Duct - electrical - and mechanical
Pi x radius squared
8-12 degrees F
Inclined manometer

21. How do you calculate the area of a circle?
Latent and sensible
RLA/FLA x 5
Pi x radius squared
400

22. What do you do after you braze a system?
Pull a vacuum
200
Infiltration and ventilation
2

23. How many amps can 14 g wire handle?
They are larger
Yes
15 A
The takeoff fitting

24. What are the two types of blower drives?
2
Belt drive and direct drive
25-ft or 50-ft
Nitrogen with a small amount of refrigerant

25. When do you install an auxillary drain pan?
They are physically larger
When it is above a conditioned space
Static pressure - velocity pressure - and total pressure
In series

26. Where is insulation used on copper tubing used for air-conditioning?
45-55%
Inside diameter (ID)
The suction line or the low-pressure side
Belt drive and direct drive

27. What kind of metering device do high-efficiency units usually use?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Before the vent
TXV
ACR (air-conditioning refrigeration) tubing

28. How is flexible duct supported?
200
2
It also rises
A band 4 inches or more in width

29. What component changes refrigerant from a low pressure gas to a high pressure gas?
Slugging
150
The suction line or the low-pressure side
Compressor

30. 8' round duct has a ballpark cfm of what?
True
Inside diameter (ID)
A swaging tool
200

31. What kind of refrigeratnts must be added in liquid form?
40 degrees F
15 A
Blended refrigerants
6

32. When must a copper joint never be soldered or brazed?
When the system is under pressure
Inclined manometer
False
Outside of the male fitting

33. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
6
The takeoff fitting

34. On what terminal do you check amperage?
6
Staples and tape
Common
30-35 degrees above ambient

35. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
They are physically larger
1/4'
5 degrees

36. Do you need a vent on a pull-through evaporator?
Yes
They are physically larger
A band 4 inches or more in width
30 A

37. If pressure rises - what happens to the superheat?
100 psig
False
It rises
On the common terminal

38. How many cfm per ton?
Over 800 degrees F
With an are rating
It will be high
400

39. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Below 800 degrees F
With an are rating
To lower the amount of pressure drop through the coil
Negative

40. How will too much refrigerant effect superheat?
When it is above a conditioned space
It will be low
2
SEER includes the energy used in the start-up and shut-down cycles

41. 6' round duct has a ballpark cfm of what?
Pull a vacuum
100
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
On the common terminal

42. Do you need a vent on a push-through evaporator?
Yes
SEER includes the energy used in the start-up and shut-down cycles
Yes
No

43. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
ACR (air-conditioning refrigeration) tubing
20 degrees F
Yes
Rise

44. In what length rolls is soft copper tubing normally available?
TXV
Yes
Inclined manometer
25-ft or 50-ft

45. How is insulation around a duct rated?
Blended refrigerants
The takeoff fitting
With an are rating
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

46. Where do you check the amps on a motor?
On the common terminal
Common
Compressor
Potential relay and start capacitor

47. What are the two ways that fresh air enters a structure?
SEER includes the energy used in the start-up and shut-down cycles
Over 800 degrees F
Infiltration and ventilation
A dirty evaporator

48. At what temperature will brazing melt?
Over 800 degrees F
A piston type metering device
With 4' saddles
Nitrogen with a small amount of refrigerant

49. What are the two functions of the air-conditioning system?
20 degrees above ambient
To remove humidity and lower dry bulb temperature
It rises
150

50. When must a copper joint never be soldered or brazed?
Common
When the system is under pressure
150
No