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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 three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Inclined manometer
Nominal-sized tubing
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

2. What are the two types of package units?
Side-by-side and over-and-under
Inclined manometer
Yes
Any amount

3. What percentage silver do you need to use for an are-410 system?
15% silphos
25-ft or 50-ft
With an are rating
Standard

4. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
Compressor
True
30 A

5. What kind of metering device do high-efficiency units usually use?
A band 4 inches or more in width
It will be low
TXV
Outside of the male fitting

6. What kind of refrigeratnts must be added in liquid form?
Boil the liquid refrigerant out ot the oil within the crankcase
Blended refrigerants
Side-by-side and over-and-under
8-12 degrees F

7. Why are some ACR tubing lines insulated?
12000
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Individual return air systems and central return air systems
18 gauge

8. 10' round duct has a ballpark cfm of what?
In series
400
Pull a vacuum
Suction

9. Do you need a trap on a push-through evaporator?
When it is a pull-through evaporator
Individual return air systems and central return air systems
No
2 minutes

10. 7' round duct has a ballpark cfm of what?
150
The suction line or the low-pressure side
When the system is under pressure
Outside of the male fitting

11. In what length rolls is soft copper tubing normally available?
Btu/hr (output) / wattage (input)
25-ft or 50-ft
It will have a decrease in superheat
8

12. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Nominal-sized tubing
Pull a vacuum
Rise

13. What type of air conditioning system must be charged using the superheat method?
Standard
A piston type metering device
100
Rise

14. How are round ducts supported?

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15. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Stranded
A bypass duct or a dump zone
False
It will be low

16. At what temperature does refrigerant condense in a high-efficiency unit?
Static pressure - velocity pressure - and total pressure
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
20 degrees above ambient
Boil the liquid refrigerant out ot the oil within the crankcase

17. If the rpm's are 3450 - how many poles does the motor have?
A piston type metering device
2
6
400

18. If the rpm's are 1750 - how many poles does the motor have?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Individual return air systems and central return air systems
4
8

19. How is ACR tubing sized?
20 degrees F
False
Outside diameter (OD)
Infiltration and ventilation

20. What are the components of a hard-start kit?
Potential relay and start capacitor
20 degrees F
Nitrogen with a small amount of refrigerant
Common

21. When do you install a trap on a drain line?
With a minimum of three evenly spaced self-tapping screws
Suction
30 degrees F
When it is a pull-through evaporator

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

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23. What is used to measure static air pressure in ducts.
A piston type metering device
40 degrees F
400
Inclined manometer

24. What are the two functions of the air-conditioning system?
12000
To remove humidity and lower dry bulb temperature
Inside diameter (ID)
Individual return air systems and central return air systems

25. What are the two ways that fresh air enters a structure?
A diffuser
The suction line or the low-pressure side
Infiltration and ventilation
Over 800 degrees F

26. How are round ducts connected to one another?
Latent and sensible
100
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws

27. How are the condenser coils different on a high-efficiency unit?
They are larger
Pistons
Infiltration and ventilation
200

28. How many cfm per ton?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Nitrogen with a small amount of refrigerant
400
Static pressure - velocity pressure - and total pressure

29. If the rpm's are 750 - how many poles does the motor have?
8
Boil the liquid refrigerant out ot the oil within the crankcase
Yes
Dehydrated with caps on each end

30. How does ACR copper pipe come?
45 degrees F
SEER includes the energy used in the start-up and shut-down cycles
To lower the amount of pressure drop through the coil
Dehydrated with caps on each end

31. How many amps can 14 g wire handle?
Any amount
15 A
It will have a decrease in superheat
Yes

32. How do you achieve high-efficiency?
45-55%
By increasing the surface of the condenser coil
A diffuser
2 minutes

33. How do you calculate the area of a circle?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Pi x radius squared
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
They are physically larger

34. If the suction pressure rises - what happens to the head pressure?
Belt drive and direct drive
12000
It also rises
Rise

35. If the rpm's are 1050 - how many poles does the motor have?
4
6
Blended refrigerants
1/4'

36. What are the two basic duct connection configurations for package units supply and return air ducts?
A band 4 inches or more in width
Over/under and side by side
L-type
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

37. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
Below 800 degrees F
Shorted winding - open winding - and grounded winding
By increasing the surface of the condenser coil

38. How many amps can 14 g wire handle?
It also rises
25-ft or 50-ft
100 psig
15 A

39. If pressure rises - what happens to the superheat?
Rise
Individual return air systems and central return air systems
Infiltration and ventilation
It rises

40. What is used to measure static air pressure in ducts.
S-clips and drives (cleats)
A bypass duct or a dump zone
Inclined manometer
Pistons

41. Where do you install a trap on a drain line?
A bypass duct or a dump zone
Individual return air systems and central return air systems
1/4'
Before the vent

42. How many cfm per ton?
400
Staples and tape
Suction
Positive

43. What are the components of a hard-start kit?
Inches of water column (in. WC)
Potential relay and start capacitor
Duct with insulation on the inside
A piston type metering device

44. What kind of copper tubing is used for plumbing and heating applications?
Outside diameter (OD)
30 degrees F
The takeoff fitting
Nominal-sized tubing

45. What is the normal evaporator temperature?
Boil the liquid refrigerant out ot the oil within the crankcase
45 degrees F
When it is a pull-through evaporator
It also rises

46. How will too much refrigerant effect superheat?
They are larger
Nitrogen with a small amount of refrigerant
It will be low
Stranded

47. If the suction pressure rises - what happens to the head pressure?
It also rises
Vapor
Inches of water column (in. WC)
30-35 degrees above ambient

48. What is the normal evaporator temperature?
With a minimum of three evenly spaced self-tapping screws
45 degrees F
2 minutes
Yes

49. What is a package unit?
Duct with insulation on the inside
Dehydrated with caps on each end
8-12 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

50. Which type of wire can handle a higher ampacity?
Yes
Vapor
Stranded
100 psig