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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. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Dehydrated with caps on each end
25-ft or 50-ft
30 degrees F
Fiberglass

2. How is flexible duct supported?
ACR (air-conditioning refrigeration) tubing
Yes
45 degrees F
A band 4 inches or more in width

3. The crankcase heater on an air-conditioning compressor is used to what?
4
Boil the liquid refrigerant out ot the oil within the crankcase
Dehydrated with caps on each end
Shorted winding - open winding - and grounded winding

4. What is the normal evaporator temperature?
Outside diameter (OD)
45 degrees F
Outside diameter (OD)
18 gauge

5. Pressure in ductwork is measured In what?
Nitrogen with a small amount of refrigerant
It will be low
20 degrees above ambient
Inches of water column (in. WC)

6. What are the three major power-consuming devices on an air-conditioning system?
A dirty evaporator
Indoor fan motor - outdoor fan motor - and the compressor
High
True

7. What is the name of the fitting where the branch line leaves the duct?
40 degrees F
The takeoff fitting
12000
Nitrogen with a small amount of refrigerant

8. How do you calculate ballpark superheat?
Heat loss
Subtract ambient temperature from 100
30 degrees F
300

9. How long should you leave a system off once you kill power before restarting it?
8-12 degrees F
Suction
Latent and sensible
2 minutes

10. If the rpm's are 1050 - how many poles does the motor have?
100
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Dehydrated with caps on each end
6

11. What are the two ways that fresh air enters a structure?
It will have a decrease in superheat
Yes
Individual return air systems and central return air systems
Infiltration and ventilation

12. How is ACR tubing sized?
40 A
Outside diameter (OD)
Infiltration and ventilation
Outside of the male fitting

13. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
The takeoff fitting
Average feet per minute X area in square feet (H' x W'/144)
To lower the amount of pressure drop through the coil

14. What are normal conditions - as defined by the ARI.
Before the vent
A bypass duct or a dump zone
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
6

15. When do you install an auxillary drain pan?
When it is above a conditioned space
Outside diameter (OD)
Nitrogen with a small amount of refrigerant
300

16. How do you calculate EER?
Btu/hr (output) / wattage (input)
No
In parallel
20 A

17. What are the three crafts normally associated with an air-conditioned installation?
140 degrees F
Heat load
Duct - electrical - and mechanical
They are larger

18. What is the name of the fitting where the branch line leaves the duct?
Duct with insulation on the inside
No
The takeoff fitting
400

19. 13 SEER is classified as what kind of efficiency?
High
45 degrees F
Duct with insulation on the inside
Shorted winding - open winding - and grounded winding

20. What are the two functions of the air-conditioning system?
It also rises
Standard
The takeoff fitting
To remove humidity and lower dry bulb temperature

21. The load on the evaporater will effect which pressure?
Pistons
Suction
40 A
30 degrees F

22. What are the four materials used to make duct?
150
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Suction
They are physically larger

23. A reciprocating compressor has what sort of moving parts?
Positive
Pistons
Latent and sensible
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

24. 9' round duct has a ballpark cfm of what?
300
20 degrees F
With a minimum of three evenly spaced self-tapping screws
Negative

25. The furnace size is calculated by what?
Heat loss
Yes
Subtract ambient temperature from 100
Duct with insulation on the inside

26. 10' round duct has a ballpark cfm of what?
A swaging tool
400
Indoor fan motor - outdoor fan motor - and the compressor
To lower the amount of pressure drop through the coil

27. How many amps can 8 g wire handle?
Blended refrigerants
40 A
Yes
8-12 degrees F

28. How will too much refrigerant effect superheat?
ACR (air-conditioning refrigeration) tubing
It will be low
Below 800 degrees F
2 minutes

29. 13 SEER is classified as what kind of efficiency?
20 degrees above ambient
A diffuser
High
100

30. In what length rolls is soft copper tubing normally available?
40 degrees F
200
Stranded
25-ft or 50-ft

31. The evaporator is designed to remove what two types of heat?
Individual return air systems and central return air systems
Latent and sensible
400
105 degrees F

32. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
140 degrees F
300
On the common terminal

33. What is used to measure static air pressure in ducts.
Inclined manometer
40 degrees F
Standard
300

34. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Yes
A bypass duct or a dump zone
Duct - electrical - and mechanical

35. At what temperature does refrigerant condense in a standard-efficiency unit?
25-ft or 50-ft
5 degrees
30-35 degrees above ambient
Negative

36. What is it called when liquid refrigerant gets into the compressor?
S-clips and drives (cleats)
On the common terminal
Average feet per minute X area in square feet (H' x W'/144)
Slugging

37. At what temperature will brazing melt?
Over 800 degrees F
It rises
Latent and sensible
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

38. Do you need a vent on a pull-through evaporator?
Negative
45-55%
Pi x radius squared
Yes

39. How is the high pressure switch wired with the low pressure switch?
TXV
140 degrees F
In parallel
It also rises

40. What do you use to check for leaks?
Over 800 degrees F
100 psig
Nitrogen with a small amount of refrigerant
Below 800 degrees F

41. What are the components of a hard-start kit?
Below 800 degrees F
20 degrees above ambient
Staples and tape
Potential relay and start capacitor

42. What component changes refrigerant from a low pressure gas to a high pressure gas?
Common
Compressor
True
400

43. If the suction pressure rises - what happens to the head pressure?
Yes
It also rises
Fiberglass
To lower the amount of pressure drop through the coil

44. What kind of copper tubing is used for refrigeration or air-conditioning applications?
400
ACR (air-conditioning refrigeration) tubing
By increasing the surface of the condenser coil
Below 800 degrees F

45. If the rpm's are 1050 - how many poles does the motor have?
2 minutes
6
Before the vent
Infiltration and ventilation

46. What do you do after you braze a system?
High
Pull a vacuum
Yes
With an are rating

47. How do you calculate cfm?

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48. 9' round duct has a ballpark cfm of what?
It will have a decrease in superheat
High
300
When it is a pull-through evaporator

49. How are round ducts connected to one another?
Any amount
They are larger
With a minimum of three evenly spaced self-tapping screws
With an are rating

50. Does a package unit come from the factory pre-charged?
Individual return air systems and central return air systems
RLA/FLA x 5
To remove humidity and lower dry bulb temperature
Yes