Test your basic knowledge |

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 will too much refrigerant effect subcooling?
It will be high
A band 4 inches or more in width
Shorted winding - open winding - and grounded winding
Potential relay and start capacitor

2. What are the three ways a motor can fail electrically?
Duct with insulation on the inside
TXV
With an are rating
Shorted winding - open winding - and grounded winding

3. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
2 minutes
L-type
40 degrees F
Nominal-sized tubing

4. The furnace size is calculated by what?
A diffuser
Btu/hr (output) / wattage (input)
Compressor
Heat loss

5. 13 SEER is classified as what kind of efficiency?
High
15% silphos
TXV
Outside of the male fitting

6. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
False
Duct - electrical - and mechanical
Heat loss

7. The compressor is cooled by liquid refrigerant. (True of False)
Pi x radius squared
40 degrees F
False
Yes

8. What is the difference between SEER and EER?
20 degrees above ambient
With an are rating
12000
SEER includes the energy used in the start-up and shut-down cycles

9. How do you calculate the area of a circle?
Standard
By increasing the surface of the condenser coil
140 degrees F
Pi x radius squared

10. Which is more efficient - a TXV or a fixed-orifice metering device?
Slugging
Yes
TXV
It will be high

11. Superheat should never be below how many degrees
Inches of water column (in. WC)
18 gauge
They are larger
5 degrees

12. Pressure in ductwork is measured In what?
6
RLA/FLA x 5
Inches of water column (in. WC)
Heat load

13. How is insulation around a duct rated?
Yes
In parallel
With an are rating
Potential relay and start capacitor

14. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
300
It will have a decrease in superheat
Inside diameter (ID)
15 A

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

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

17. If the rpm's are 1750 - how many poles does the motor have?
4
Any amount
In series
In series

18. What are normal conditions - as defined by the ARI.
False
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
8
The takeoff fitting

19. 10 SEER is classified as what kind of efficiency?
TXV
They are larger
A diffuser
Standard

20. If the rpm's are 3450 - how many poles does the motor have?
TXV
2
Belt drive and direct drive
25-ft or 50-ft

21. How will too much refrigerant effect superheat?
200
12000
It will be low
A bypass duct or a dump zone

22. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
The takeoff fitting
By increasing the surface of the condenser coil
Outside of the male fitting

23. If the rpm's are 750 - how many poles does the motor have?
In series
100 psig
8
Infiltration and ventilation

24. Why are some ACR tubing lines insulated?
100 psig
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
High
It rises

25. Does a package unit come from the factory pre-charged?
Yes
Potential relay and start capacitor
Individual return air systems and central return air systems
20 degrees above ambient

26. How will too much refrigerant effect subcooling?
To lower the amount of pressure drop through the coil
It will be high
A piston type metering device
15 A

27. How many amps can 8 g wire handle?
No
They are physically larger
They are physically larger
40 A

28. What is used to measure static air pressure in ducts.
300
It will have a decrease in superheat
Inclined manometer
Pi x radius squared

29. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
It will be high
1/4'
45 degrees F

30. At what temperature will soft solder melt?
Slugging
High
Below 800 degrees F
They are physically larger

31. Which type of wire can handle a higher ampacity?
Stranded
400
Compressor
TXV

32. The fan switch closes at what temperature?
8
140 degrees F
25-ft or 50-ft
It will be low

33. Do you need a vent on a push-through evaporator?
Yes
True
Blended refrigerants
Nitrogen with a small amount of refrigerant

34. What sort of pressure will a pull-through evaporator have?
RLA/FLA x 5
400
400
Negative

35. If the rpm's are 1050 - how many poles does the motor have?
Infiltration and ventilation
6
With a minimum of three evenly spaced self-tapping screws
By increasing the surface of the condenser coil

36. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Stranded
Yes
20 degrees F
Common

37. Where do you apply flux when soldering?
45 degrees F
By increasing the surface of the condenser coil
Outside of the male fitting
With 4' saddles

38. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
Any amount
Vapor
Outside diameter (OD)

39. How many amps can 14 g wire handle?
15 A
With an are rating
40 A
They are physically larger

40. Do you need a trap on a push-through evaporator?
2
A swaging tool
No
Before the vent

41. Will a dirty condenser cause a rise or fall in pressure?
Dehydrated with caps on each end
It will have a decrease in superheat
Rise
Duct - electrical - and mechanical

42. How many cfm per ton?
True
400
Btu/hr (output) / wattage (input)
Boil the liquid refrigerant out ot the oil within the crankcase

43. The crankcase heater on an air-conditioning compressor is used to what?
2 minutes
8
Boil the liquid refrigerant out ot the oil within the crankcase
Yes

44. The evaporator is designed to remove what two types of heat?
40 A
Yes
Positive
Latent and sensible

45. How are the condenser coils different on a high-efficiency unit?
High
Pistons
They are larger
Btu/hr (output) / wattage (input)

46. How many amps can 10 g wire handle?
Side-by-side and over-and-under
High
Negative
30 A

47. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
18 gauge
12000
RLA/FLA x 5
In series

48. Most duct insulation is made of what?
Fiberglass
Inclined manometer
A piston type metering device
It also rises

49. Do you need a vent on a pull-through evaporator?
A diffuser
Yes
Subtract ambient temperature from 100
Nitrogen with a small amount of refrigerant

50. What are the two basic duct connection configurations for package units supply and return air ducts?
A piston type metering device
It also rises
Over/under and side by side
Vapor