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. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Dehydrated with caps on each end
Any amount
L-type
It will be high

2. What are normal conditions - as defined by the ARI.
Positive
True
Common
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

3. Sections of duct board can be fastened together with what?
Staples and tape
They are larger
20 degrees F
Negative

4. Which type of wire can handle a higher ampacity?
Yes
Nitrogen with a small amount of refrigerant
Stranded
20 degrees above ambient

5. 7' round duct has a ballpark cfm of what?
Standard
Heat loss
150
S-clips and drives (cleats)

6. The furnace size is calculated by what?
Heat loss
2 minutes
4
Common

7. Do you need a vent on a push-through evaporator?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It also rises
Yes
Potential relay and start capacitor

8. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Below 800 degrees F
300
100 psig

9. 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
It will be low
Pistons
ACR (air-conditioning refrigeration) tubing

10. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It will be high
Indoor fan motor - outdoor fan motor - and the compressor
The suction line or the low-pressure side

11. The fan switch opens at what temperature?
No
105 degrees F
They are physically larger
Positive

12. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
ACR (air-conditioning refrigeration) tubing
With a minimum of three evenly spaced self-tapping screws
100 psig

13. How do you calculate LRA?
Negative
With an are rating
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
RLA/FLA x 5

14. At what temperature does refrigerant condense in a high-efficiency unit?
No
Before the vent
Below 800 degrees F
20 degrees above ambient

15. A reciprocating compressor has what sort of moving parts?
TXV
Pistons
Rise
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

16. Where do you apply flux when soldering?
Outside of the male fitting
12000
100
Dehydrated with caps on each end

17. How do you calculate cfm?

18. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Belt drive and direct drive
Dehydrated with caps on each end
L-type
18 gauge

19. How will too much refrigerant effect superheat?
To remove humidity and lower dry bulb temperature
Boil the liquid refrigerant out ot the oil within the crankcase
It will be low
100 psig

20. 8' round duct has a ballpark cfm of what?
Fiberglass
200
Negative
100

21. 10 SEER is classified as what kind of efficiency?
20 degrees above ambient
It will be low
Standard
20 degrees above ambient

22. How is flexible duct supported?
A band 4 inches or more in width
Potential relay and start capacitor
5 degrees
Over/under and side by side

23. How many amps can 14 g wire handle?
25-ft or 50-ft
15 A
2 minutes
1/4'

24. The crankcase heater on an air-conditioning compressor is used to what?
45 degrees F
It will have a decrease in superheat
Outside diameter (OD)
Boil the liquid refrigerant out ot the oil within the crankcase

25. If the suction pressure rises - what happens to the head pressure?
It also rises
30-35 degrees above ambient
45 degrees F
Nominal-sized tubing

26. What gauge is thermostat wire?
They are larger
Over/under and side by side
Belt drive and direct drive
18 gauge

27. What is it called when liquid refrigerant gets into the compressor?
Outside of the male fitting
Yes
Slugging
2 minutes

28. Does a package unit come from the factory pre-charged?
High
Yes
Shorted winding - open winding - and grounded winding
It will be high

29. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Common
It rises
False
45-55%

30. The fan switch opens at what temperature?
105 degrees F
Duct with insulation on the inside
High
Suction

31. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
100
It rises
They are physically larger

32. What are the components of a hard-start kit?
Rise
SEER includes the energy used in the start-up and shut-down cycles
Potential relay and start capacitor
Any amount

33. How long should you leave a system off once you kill power before restarting it?
100 psig
When it is above a conditioned space
2 minutes
In series

34. How are round ducts supported?

35. What gauge is thermostat wire?
A dirty evaporator
18 gauge
1/4'
100

36. How do you calculate ballpark superheat?
When the system is under pressure
In parallel
Yes
Subtract ambient temperature from 100

37. If the rpm's are 750 - how many poles does the motor have?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
8
Yes

38. How is ACR tubing sized?
5 degrees
Belt drive and direct drive
They are larger
Outside diameter (OD)

39. 8' round duct has a ballpark cfm of what?
200
30-35 degrees above ambient
Infiltration and ventilation
In series

40. What is the design boiling point for most evaporator coils in residential air conditioning?
Pistons
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
40 degrees F
The suction line or the low-pressure side

41. How does ACR copper pipe come?
Dehydrated with caps on each end
45 degrees F
150
With an are rating

42. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Potential relay and start capacitor
L-type
45 degrees F
They are physically larger

43. 6' round duct has a ballpark cfm of what?
20 A
5 degrees
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
100

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

45. Where do you install a trap on a drain line?
Subtract ambient temperature from 100
Before the vent
Heat loss
Inclined manometer

46. What are the components of a hard-start kit?
Boil the liquid refrigerant out ot the oil within the crankcase
Potential relay and start capacitor
Duct - electrical - and mechanical
30-35 degrees above ambient

47. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
With a minimum of three evenly spaced self-tapping screws
False
A swaging tool

48. What is the range for normal superheat and subcooling?
It will be low
Infiltration and ventilation
8-12 degrees F
ACR (air-conditioning refrigeration) tubing

49. How are round ducts connected to one another?
Yes
18 gauge
With a minimum of three evenly spaced self-tapping screws
Subtract ambient temperature from 100

50. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Yes
A band 4 inches or more in width
Blended refrigerants
In series