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 are the condenser coils different on a high-efficiency unit?
They are larger
1/4'
It rises
True

2. If the suction pressure rises - what happens to the head pressure?
Suction
It also rises
2 minutes
They are physically larger

3. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
Nominal-sized tubing
8
Rise

4. When must a copper joint never be soldered or brazed?
150
When the system is under pressure
Side-by-side and over-and-under
Standard

5. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Belt drive and direct drive
1/4'
400
L-type

6. At what temperature does refrigerant condense in a high-efficiency unit?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
SEER includes the energy used in the start-up and shut-down cycles
20 degrees above ambient
It will have a decrease in superheat

7. The crankcase heater on an air-conditioning compressor is used to what?
Nitrogen with a small amount of refrigerant
Subtract ambient temperature from 100
Boil the liquid refrigerant out ot the oil within the crankcase
20 A

8. How many amps can 12 g wire handle?
Subtract ambient temperature from 100
1/4'
20 A
By increasing the surface of the condenser coil

9. The crankcase heater on an air-conditioning compressor is used to what?
Slugging
5 degrees
Below 800 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase

10. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Compressor
8-12 degrees F
Any amount
30 A

11. How is flexible duct supported?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
1/4'
Inside diameter (ID)
A band 4 inches or more in width

12. What are the three crafts normally associated with an air-conditioned installation?
Rise
Duct - electrical - and mechanical
1/4'
Static pressure - velocity pressure - and total pressure

13. How are the condenser coils different on a high-efficiency unit?
Yes
On the common terminal
They are larger
Rise

14. What is the difference between SEER and EER?
40 degrees F
In parallel
SEER includes the energy used in the start-up and shut-down cycles
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

15. What is the normal evaporator temperature?
45 degrees F
Stranded
Yes
With 4' saddles

16. What type of air conditioning system must be charged using the superheat method?
300
Nominal-sized tubing
Over/under and side by side
A piston type metering device

17. What are the three pressures created by moving air in ductwork?
2 minutes
100
Duct with insulation on the inside
Static pressure - velocity pressure - and total pressure

18. What do you use to connect square and rectangular ductboard together?
Below 800 degrees F
Before the vent
S-clips and drives (cleats)
30 A

19. How do you calculate LRA?
RLA/FLA x 5
When the system is under pressure
105 degrees F
40 A

20. What are the two types of return air systems in residential installations?
To remove humidity and lower dry bulb temperature
It will be low
Below 800 degrees F
Individual return air systems and central return air systems

21. If the rpm's are 1050 - how many poles does the motor have?
6
100
In parallel
In series

22. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
The suction line or the low-pressure side
When the system is under pressure
30 degrees F
40 degrees F

23. Where do you apply flux when soldering?
RLA/FLA x 5
Outside of the male fitting
Btu/hr (output) / wattage (input)
18 gauge

24. The fan switch opens at what temperature?
105 degrees F
True
40 A
Yes

25. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Infiltration and ventilation
In series
100 psig
Positive

26. How many amps can 10 g wire handle?
In parallel
4
Below 800 degrees F
30 A

27. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
2 minutes
Duct with insulation on the inside
True
Negative

28. Where is insulation used on copper tubing used for air-conditioning?
Heat load
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
The suction line or the low-pressure side
Any amount

29. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
105 degrees F
12000
400
30 degrees F

30. Superheat should never be below how many degrees
L-type
45-55%
Potential relay and start capacitor
5 degrees

31. What do you use to check for leaks?
Slugging
S-clips and drives (cleats)
True
Nitrogen with a small amount of refrigerant

32. How many amps can 8 g wire handle?
140 degrees F
5 degrees
40 A
The takeoff fitting

33. What do you use to check for leaks?
Heat load
To lower the amount of pressure drop through the coil
Nitrogen with a small amount of refrigerant
1/4'

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

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35. Which type of wire can handle a higher ampacity?
Boil the liquid refrigerant out ot the oil within the crankcase
Btu/hr (output) / wattage (input)
Stranded
30 A

36. Where do you apply flux when soldering?
40 degrees F
15 A
Outside of the male fitting
2 minutes

37. At what temperature will brazing melt?
8-12 degrees F
It will be high
Over 800 degrees F
Nitrogen with a small amount of refrigerant

38. What are the two ways that fresh air enters a structure?
It rises
Belt drive and direct drive
High
Infiltration and ventilation

39. Do you need a vent on a push-through evaporator?
Duct with insulation on the inside
25-ft or 50-ft
20 degrees F
Yes

40. How do you calculate EER?
Btu/hr (output) / wattage (input)
S-clips and drives (cleats)
Pistons
Side-by-side and over-and-under

41. How many amps can 14 g wire handle?
Shorted winding - open winding - and grounded winding
Compressor
S-clips and drives (cleats)
15 A

42. Do you need a trap on a pull-through evaporator?
105 degrees F
Blended refrigerants
Common
Yes

43. What kind of metering device do high-efficiency units usually use?
6
TXV
Static pressure - velocity pressure - and total pressure
8-12 degrees F

44. How is nominal-sized tubing sized?
Inside diameter (ID)
Inclined manometer
30 A
TXV

45. Why are some ACR tubing lines insulated?
Heat loss
Dehydrated with caps on each end
Heat load
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

46. 7' round duct has a ballpark cfm of what?
To remove humidity and lower dry bulb temperature
Dehydrated with caps on each end
150
It rises

47. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
40 A
In series
20 degrees F
Any amount

48. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
The takeoff fitting
They are larger
True
To lower the amount of pressure drop through the coil

49. What is considered normal operating conditions?
20 degrees above ambient
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
RLA/FLA x 5

50. When do you install an auxillary drain pan?
When it is above a conditioned space
45-55%
Staples and tape
Stranded