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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 many amps can 10 g wire handle?
TXV
30 A
Individual return air systems and central return air systems
A diffuser

2. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
2
Nominal-sized tubing
L-type
To lower the amount of pressure drop through the coil

3. If the rpm's are 1750 - how many poles does the motor have?
30 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
4
Inches of water column (in. WC)

4. Can refrigerant line sets be altered in length?
Stranded
A diffuser
20 degrees above ambient
Yes

5. What is the difference between SEER and EER?
Negative
20 A
SEER includes the energy used in the start-up and shut-down cycles
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

6. If the rpm's are 750 - how many poles does the motor have?
20 degrees F
Pistons
8
A band 4 inches or more in width

7. The crankcase heater on an air-conditioning compressor is used to what?
12000
Potential relay and start capacitor
Boil the liquid refrigerant out ot the oil within the crankcase
SEER includes the energy used in the start-up and shut-down cycles

8. How many amps can 12 g wire handle?
No
False
Static pressure - velocity pressure - and total pressure
20 A

9. Do you need a trap on a push-through evaporator?
No
20 A
RLA/FLA x 5
300

10. What kind of metering device do high-efficiency units usually use?
They are larger
A diffuser
8-12 degrees F
TXV

11. If the rpm's are 1050 - how many poles does the motor have?
150
The takeoff fitting
6
2

12. What component changes refrigerant from a low pressure gas to a high pressure gas?
Slugging
30 A
Compressor
20 A

13. What are the components of a hard-start kit?
A diffuser
Potential relay and start capacitor
Heat load
On the common terminal

14. What is used to measure static air pressure in ducts.
Latent and sensible
A bypass duct or a dump zone
Inside diameter (ID)
Inclined manometer

15. 7' round duct has a ballpark cfm of what?
Indoor fan motor - outdoor fan motor - and the compressor
It rises
30-35 degrees above ambient
150

16. Where do you check the amps on a motor?
On the common terminal
Over/under and side by side
30 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

17. How many cfm per ton?
15 A
Stranded
400
The takeoff fitting

18. What is a package unit?
Boil the liquid refrigerant out ot the oil within the crankcase
Yes
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

19. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
Potential relay and start capacitor
When the system is under pressure
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

20. What sort of pressure will a pull-through evaporator have?
Negative
Belt drive and direct drive
20 A
Indoor fan motor - outdoor fan motor - and the compressor

21. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Latent and sensible
It will be low
8-12 degrees F
True

22. The compressor is cooled by liquid refrigerant. (True of False)
Outside diameter (OD)
On the common terminal
False
4

23. How many amps can 8 g wire handle?
20 degrees above ambient
15 A
40 A
Any amount

24. How are the condenser coils different on a high-efficiency unit?
They are larger
Heat load
Static pressure - velocity pressure - and total pressure
8-12 degrees F

25. Do you need a trap on a push-through evaporator?
Duct - electrical - and mechanical
8-12 degrees F
Yes
No

26. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
Over/under and side by side
Heat load
2

27. At what temperature will brazing melt?
Over 800 degrees F
200
Pi x radius squared
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

28. How are round ducts supported?

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29. What are normal conditions - as defined by the ARI.
SEER includes the energy used in the start-up and shut-down cycles
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
40 A
Potential relay and start capacitor

30. The furnace size is calculated by what?
Standard
100 psig
18 gauge
Heat loss

31. What are the two types of blower drives?
Belt drive and direct drive
True
Potential relay and start capacitor
RLA/FLA x 5

32. What kind of copper tubing is used for refrigeration or air-conditioning applications?
105 degrees F
Pi x radius squared
ACR (air-conditioning refrigeration) tubing
Stranded

33. What sort of pressure will a pull-through evaporator have?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
150
A band 4 inches or more in width
Negative

34. 10 SEER is classified as what kind of efficiency?
15% silphos
Standard
The suction line or the low-pressure side
Pull a vacuum

35. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
With 4' saddles
Shorted winding - open winding - and grounded winding
18 gauge

36. A reciprocating compressor has what sort of moving parts?
A piston type metering device
8
Pistons
Yes

37. When do you install a trap on a drain line?
To remove humidity and lower dry bulb temperature
When it is a pull-through evaporator
Yes
Fiberglass

38. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
High
A piston type metering device
45-55%
Yes

39. What sort of pressure will a push-through evaporator have?
Positive
5 degrees
A piston type metering device
5 degrees

40. How do you calculate ballpark superheat?
Slugging
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
15% silphos
Subtract ambient temperature from 100

41. What is used to measure static air pressure in ducts.
Staples and tape
With a minimum of three evenly spaced self-tapping screws
ACR (air-conditioning refrigeration) tubing
Inclined manometer

42. A reciprocating compressor has what sort of moving parts?
Pistons
Yes
Boil the liquid refrigerant out ot the oil within the crankcase
On the common terminal

43. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
Shorted winding - open winding - and grounded winding
100
Negative

44. How do you calculate LRA?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
200
30 degrees F
RLA/FLA x 5

45. What sort of pressure will a push-through evaporator have?
In parallel
Positive
8
6

46. What tool is used to expand the diameter of soft copper tubing
2 minutes
30-35 degrees above ambient
A swaging tool
Inside diameter (ID)

47. What is lined duct?
Standard
8
Duct with insulation on the inside
Blended refrigerants

48. What is the range for normal superheat and subcooling?
8-12 degrees F
Pull a vacuum
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Below 800 degrees F

49. Most duct insulation is made of what?
Outside diameter (OD)
Fiberglass
A dirty evaporator
140 degrees F

50. Superheat should never be below how many degrees
12000
A bypass duct or a dump zone
5 degrees
SEER includes the energy used in the start-up and shut-down cycles