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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. The furnace size is calculated by what?
Heat loss
15% silphos
105 degrees F
In parallel

2. How are round ducts supported?

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3. How is the high pressure switch wired with the low pressure switch?
By increasing the surface of the condenser coil
In parallel
Shorted winding - open winding - and grounded winding
Compressor

4. How do you calculate the area of a circle?
Pi x radius squared
They are physically larger
2 minutes
40 A

5. At what temperature will brazing melt?
Nitrogen with a small amount of refrigerant
Over 800 degrees F
The suction line or the low-pressure side
20 A

6. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Stranded
The takeoff fitting
45-55%

7. What are the three major power-consuming devices on an air-conditioning system?
2 minutes
Pi x radius squared
Yes
Indoor fan motor - outdoor fan motor - and the compressor

8. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Slugging
Before the vent
Over/under and side by side
It will have a decrease in superheat

9. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Indoor fan motor - outdoor fan motor - and the compressor
TXV
To remove humidity and lower dry bulb temperature
To lower the amount of pressure drop through the coil

10. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
45-55%
They are physically larger
When it is a pull-through evaporator
It will be low

11. How do you calculate the area of a circle?
Pi x radius squared
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
15% silphos
140 degrees F

12. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
15 A
To lower the amount of pressure drop through the coil
15% silphos
A band 4 inches or more in width

13. How do you calculate LRA?
RLA/FLA x 5
Dehydrated with caps on each end
300
15 A

14. How is insulation around a duct rated?
With an are rating
Duct - electrical - and mechanical
Positive
Suction

15. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
The suction line or the low-pressure side
Pull a vacuum
They are physically larger
30 degrees F

16. How do you calculate EER?
A dirty evaporator
Btu/hr (output) / wattage (input)
The suction line or the low-pressure side
True

17. Where do you install a trap on a drain line?
Inches of water column (in. WC)
False
Before the vent
A dirty evaporator

18. Do you need a vent on a pull-through evaporator?
Any amount
The takeoff fitting
They are larger
Yes

19. 10 SEER is classified as what kind of efficiency?
It also rises
15% silphos
20 degrees F
Standard

20. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
150
Inches of water column (in. WC)
High

21. 10' round duct has a ballpark cfm of what?
Shorted winding - open winding - and grounded winding
Belt drive and direct drive
400
Staples and tape

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

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23. The evaporator is designed to remove what two types of heat?
Yes
40 A
Latent and sensible
Shorted winding - open winding - and grounded winding

24. On what terminal do you check amperage?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
In parallel
Common
5 degrees

25. What do you use to check for leaks?
Before the vent
ACR (air-conditioning refrigeration) tubing
Nitrogen with a small amount of refrigerant
8-12 degrees F

26. Where do you apply flux when soldering?
Fiberglass
Outside of the male fitting
Duct - electrical - and mechanical
Standard

27. What sort of pressure will a push-through evaporator have?
140 degrees F
Positive
Side-by-side and over-and-under
L-type

28. What kind of copper tubing is used for plumbing and heating applications?
12000
Nominal-sized tubing
100 psig
Yes

29. What are the three ways a motor can fail electrically?
In parallel
Nominal-sized tubing
Over 800 degrees F
Shorted winding - open winding - and grounded winding

30. If pressure rises - what happens to the superheat?
It also rises
With an are rating
Side-by-side and over-and-under
It rises

31. Do you need a vent on a pull-through evaporator?
Fiberglass
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Yes
Slugging

32. What are normal conditions - as defined by the ARI.
In series
False
Side-by-side and over-and-under
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

33. At what temperature does refrigerant condense in a standard-efficiency unit?
400
15% silphos
30-35 degrees above ambient
5 degrees

34. The crankcase heater on an air-conditioning compressor is used to what?
140 degrees F
Pull a vacuum
4
Boil the liquid refrigerant out ot the oil within the crankcase

35. What do you use to connect square and rectangular ductboard together?
Indoor fan motor - outdoor fan motor - and the compressor
S-clips and drives (cleats)
It also rises
It will have a decrease in superheat

36. What component changes refrigerant from a low pressure gas to a high pressure gas?
Yes
RLA/FLA x 5
200
Compressor

37. The fan switch closes at what temperature?
140 degrees F
A band 4 inches or more in width
Inclined manometer
Btu/hr (output) / wattage (input)

38. How many cfm per ton?
When the system is under pressure
400
When it is above a conditioned space
Yes

39. What is considered normal operating conditions?
Boil the liquid refrigerant out ot the oil within the crankcase
They are larger
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
18 gauge

40. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
Inclined manometer
25-ft or 50-ft
6

41. What do you do after you braze a system?
When it is a pull-through evaporator
8-12 degrees F
With 4' saddles
Pull a vacuum

42. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
It will be high
45-55%
15 A

43. How does ACR copper pipe come?
400
30 degrees F
Dehydrated with caps on each end
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

44. Superheat should never be below how many degrees
TXV
105 degrees F
5 degrees
When it is above a conditioned space

45. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Blended refrigerants
When it is above a conditioned space
They are physically larger
In series

46. What are the two basic duct connection configurations for package units supply and return air ducts?
Heat loss
Over/under and side by side
Suction
It will have a decrease in superheat

47. How many BTU's per ton?
12000
Yes
18 gauge
They are physically larger

48. What is the typical pressure differance across a TXV?
Pistons
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
100 psig
Static pressure - velocity pressure - and total pressure

49. If the rpm's are 1050 - how many poles does the motor have?
6
4
5 degrees
Infiltration and ventilation

50. If pressure rises - what happens to the superheat?
It will be high
False
To lower the amount of pressure drop through the coil
It rises