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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. If the rpm's are 750 - how many poles does the motor have?
To remove humidity and lower dry bulb temperature
By increasing the surface of the condenser coil
8
40 A

2. If the suction pressure rises - what happens to the head pressure?
It also rises
400
True
Potential relay and start capacitor

3. How long should you leave a system off once you kill power before restarting it?
It rises
20 degrees F
2 minutes
Yes

4. What can cause a decrease in suction pressure on an air-conditioning system?
Yes
To remove humidity and lower dry bulb temperature
A dirty evaporator
4

5. How many amps can 10 g wire handle?
It also rises
Individual return air systems and central return air systems
30 A
Nitrogen with a small amount of refrigerant

6. What are the four materials used to make duct?
100 psig
8
20 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

7. If the rpm's are 1750 - how many poles does the motor have?
Yes
4
6
2

8. How is nominal-sized tubing sized?
Heat load
Inside diameter (ID)
With an are rating
When the system is under pressure

9. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Belt drive and direct drive
100 psig
40 A

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

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11. What are the two types of blower drives?
20 degrees above ambient
Belt drive and direct drive
A diffuser
140 degrees F

12. Do you need a trap on a push-through evaporator?
No
2
When it is a pull-through evaporator
Common

13. The fan switch closes at what temperature?
Suction
In series
Yes
140 degrees F

14. How long should you leave a system off once you kill power before restarting it?
2 minutes
High
Boil the liquid refrigerant out ot the oil within the crankcase
Suction

15. 9' round duct has a ballpark cfm of what?
In series
Slugging
On the common terminal
300

16. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Any amount
8
45 degrees F

17. Do you need a trap on a push-through evaporator?
Pi x radius squared
Yes
No
A swaging tool

18. How many amps can 14 g wire handle?
Pull a vacuum
When it is a pull-through evaporator
Duct - electrical - and mechanical
15 A

19. If the rpm's are 3450 - how many poles does the motor have?
2
False
It will be low
They are physically larger

20. What are the four materials used to make duct?
40 A
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
2 minutes
400

21. What sort of pressure will a push-through evaporator have?
45 degrees F
True
Positive
Yes

22. Where do you apply flux when soldering?
Infiltration and ventilation
Outside diameter (OD)
The suction line or the low-pressure side
Outside of the male fitting

23. 8' round duct has a ballpark cfm of what?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
200
S-clips and drives (cleats)
100

24. How are the condenser coils different on a high-efficiency unit?
A bypass duct or a dump zone
They are larger
Nitrogen with a small amount of refrigerant
45 degrees F

25. What are the three major power-consuming devices on an air-conditioning system?
Vapor
15% silphos
S-clips and drives (cleats)
Indoor fan motor - outdoor fan motor - and the compressor

26. How is flexible duct supported?
A band 4 inches or more in width
Outside diameter (OD)
1/4'
Suction

27. Where is insulation used on copper tubing used for air-conditioning?
With an are rating
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
400
The suction line or the low-pressure side

28. What do you use to check for leaks?
A dirty evaporator
Nitrogen with a small amount of refrigerant
15 A
15% silphos

29. Which type of wire can handle a higher ampacity?
Blended refrigerants
5 degrees
Stranded
With 4' saddles

30. Where do you apply flux when soldering?
20 degrees F
Shorted winding - open winding - and grounded winding
Outside of the male fitting
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

31. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Common
They are physically larger
It will be high
Duct with insulation on the inside

32. Will a dirty condenser cause a rise or fall in pressure?
Rise
No
L-type
High

33. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Blended refrigerants
ACR (air-conditioning refrigeration) tubing
It will be low
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

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

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35. What gauge is thermostat wire?
To lower the amount of pressure drop through the coil
A dirty evaporator
18 gauge
ACR (air-conditioning refrigeration) tubing

36. If the rpm's are 1050 - how many poles does the motor have?
They are physically larger
6
8-12 degrees F
When the system is under pressure

37. Do you need a vent on a push-through evaporator?
A diffuser
4
Pull a vacuum
Yes

38. The load on the evaporater will effect which pressure?
Duct - electrical - and mechanical
Suction
Indoor fan motor - outdoor fan motor - and the compressor
Fiberglass

39. What is considered normal operating conditions?
Nitrogen with a small amount of refrigerant
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
No
When it is a pull-through evaporator

40. Can refrigerant line sets be altered in length?
To remove humidity and lower dry bulb temperature
It rises
Heat loss
Yes

41. What are the three major power-consuming devices on an air-conditioning system?
4
Indoor fan motor - outdoor fan motor - and the compressor
Vapor
Boil the liquid refrigerant out ot the oil within the crankcase

42. 6' round duct has a ballpark cfm of what?
100
Outside of the male fitting
30 A
Negative

43. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
A bypass duct or a dump zone
30 A
In series
12000

44. 10 SEER is classified as what kind of efficiency?
A bypass duct or a dump zone
Standard
To lower the amount of pressure drop through the coil
15 A

45. What sort of pressure will a pull-through evaporator have?
40 degrees F
Stranded
105 degrees F
Negative

46. In what state is the refrigerant in the compressor?
SEER includes the energy used in the start-up and shut-down cycles
Static pressure - velocity pressure - and total pressure
Shorted winding - open winding - and grounded winding
Vapor

47. What is the normal evaporator temperature?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When the system is under pressure
45 degrees F
With 4' saddles

48. What sort of pressure will a pull-through evaporator have?
Compressor
In series
Negative
Over/under and side by side

49. The compressor is cooled by liquid refrigerant. (True of False)
On the common terminal
The suction line or the low-pressure side
Heat loss
False

50. 7' round duct has a ballpark cfm of what?
Any amount
150
A piston type metering device
Heat load