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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. How is nominal-sized tubing sized?
Nominal-sized tubing
Inside diameter (ID)
TXV
Boil the liquid refrigerant out ot the oil within the crankcase

2. How are round ducts supported?

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3. What can cause a decrease in suction pressure on an air-conditioning system?
True
A dirty evaporator
Suction
The suction line or the low-pressure side

4. At what temperature does refrigerant condense in a high-efficiency unit?
Infiltration and ventilation
When the system is under pressure
Subtract ambient temperature from 100
20 degrees above ambient

5. 10' round duct has a ballpark cfm of what?
1/4'
2 minutes
400
Indoor fan motor - outdoor fan motor - and the compressor

6. At what temperature will soft solder melt?
6
Average feet per minute X area in square feet (H' x W'/144)
Inclined manometer
Below 800 degrees F

7. Where do you install a trap on a drain line?
Before the vent
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
On the common terminal
Static pressure - velocity pressure - and total pressure

8. Do you need a trap on a push-through evaporator?
2 minutes
15% silphos
Yes
No

9. On what terminal do you check amperage?
Stranded
Heat load
Common
Average feet per minute X area in square feet (H' x W'/144)

10. What can cause a decrease in suction pressure on an air-conditioning system?
The takeoff fitting
True
A dirty evaporator
The takeoff fitting

11. A reciprocating compressor has what sort of moving parts?
25-ft or 50-ft
Pistons
45-55%
Common

12. How many amps can 12 g wire handle?
15% silphos
A dirty evaporator
2 minutes
20 A

13. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
With 4' saddles
L-type
Inches of water column (in. WC)

14. At what temperature does refrigerant condense in a high-efficiency unit?
They are larger
20 degrees above ambient
Staples and tape
100

15. What are the two types of blower drives?
With an are rating
Positive
Belt drive and direct drive
Latent and sensible

16. What are the three major power-consuming devices on an air-conditioning system?
Infiltration and ventilation
15 A
Indoor fan motor - outdoor fan motor - and the compressor
False

17. How many BTU's per ton?
12000
Yes
Pull a vacuum
Over 800 degrees F

18. If the rpm's are 1050 - how many poles does the motor have?
Individual return air systems and central return air systems
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Potential relay and start capacitor
6

19. Do you need a vent on a push-through evaporator?
Individual return air systems and central return air systems
Yes
100 psig
30-35 degrees above ambient

20. What percentage silver do you need to use for an are-410 system?
When the system is under pressure
It will be low
To remove humidity and lower dry bulb temperature
15% silphos

21. If the rpm's are 1750 - how many poles does the motor have?
4
Below 800 degrees F
1/4'
Potential relay and start capacitor

22. When do you install an auxillary drain pan?
A dirty evaporator
When it is above a conditioned space
Pistons
Before the vent

23. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
20 A
200
15% silphos
In series

24. If pressure rises - what happens to the superheat?
It rises
Stranded
Dehydrated with caps on each end
They are physically larger

25. How many amps can 12 g wire handle?
20 A
Outside diameter (OD)
Pi x radius squared
Below 800 degrees F

26. If the rpm's are 750 - how many poles does the motor have?
8
SEER includes the energy used in the start-up and shut-down cycles
A dirty evaporator
Boil the liquid refrigerant out ot the oil within the crankcase

27. What is the typical pressure differance across a TXV?
Nitrogen with a small amount of refrigerant
6
To remove humidity and lower dry bulb temperature
100 psig

28. When must a copper joint never be soldered or brazed?
When the system is under pressure
A dirty evaporator
The takeoff fitting
Inclined manometer

29. Sections of duct board can be fastened together with what?
Staples and tape
4
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Individual return air systems and central return air systems

30. What type of air conditioning system must be charged using the superheat method?
Latent and sensible
Suction
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A piston type metering device

31. What are the two types of return air systems in residential installations?
Any amount
Individual return air systems and central return air systems
Rise
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

32. What is used to measure static air pressure in ducts.
15 A
Any amount
Inclined manometer
Static pressure - velocity pressure - and total pressure

33. 13 SEER is classified as what kind of efficiency?
It also rises
High
30-35 degrees above ambient
When it is a pull-through evaporator

34. Which is more efficient - a TXV or a fixed-orifice metering device?
With a minimum of three evenly spaced self-tapping screws
TXV
15% silphos
No

35. What is it called when liquid refrigerant gets into the compressor?
Slugging
100
With 4' saddles
S-clips and drives (cleats)

36. In what state is the refrigerant in the compressor?
20 degrees F
Heat loss
Vapor
It will be low

37. What are the two basic duct connection configurations for package units supply and return air ducts?
They are physically larger
30-35 degrees above ambient
Over/under and side by side
A dirty evaporator

38. What is lined duct?
By increasing the surface of the condenser coil
Fiberglass
Duct with insulation on the inside
When it is above a conditioned space

39. How does ACR copper pipe come?
140 degrees F
With an are rating
Dehydrated with caps on each end
4

40. What is it called when liquid refrigerant gets into the compressor?
They are larger
Slugging
2 minutes
Inclined manometer

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

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42. How is insulation around a duct rated?
When the system is under pressure
With 4' saddles
Over/under and side by side
With an are rating

43. If the rpm's are 3450 - how many poles does the motor have?
No
It will be high
A swaging tool
2

44. 10 SEER is classified as what kind of efficiency?
Before the vent
With a minimum of three evenly spaced self-tapping screws
Standard
TXV

45. Why are some ACR tubing lines insulated?
Duct with insulation on the inside
To remove humidity and lower dry bulb temperature
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
30-35 degrees above ambient

46. What are the two types of return air systems in residential installations?
Heat load
S-clips and drives (cleats)
Indoor fan motor - outdoor fan motor - and the compressor
Individual return air systems and central return air systems

47. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Stranded
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Static pressure - velocity pressure - and total pressure

48. The evaporator is designed to remove what two types of heat?
2 minutes
Belt drive and direct drive
400
Latent and sensible

49. How many amps can 14 g wire handle?
To remove humidity and lower dry bulb temperature
25-ft or 50-ft
They are larger
15 A

50. 10' round duct has a ballpark cfm of what?
400
With a minimum of three evenly spaced self-tapping screws
Static pressure - velocity pressure - and total pressure
Yes