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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. At what temperature will soft solder melt?
Stranded
Indoor fan motor - outdoor fan motor - and the compressor
Below 800 degrees F
300

2. How is insulation around a duct rated?
With an are rating
Rise
RLA/FLA x 5
With a minimum of three evenly spaced self-tapping screws

3. What do you use to connect square and rectangular ductboard together?
Outside diameter (OD)
S-clips and drives (cleats)
Rise
20 degrees above ambient

4. Superheat should never be below how many degrees
Duct - electrical - and mechanical
5 degrees
300
No

5. If the suction pressure rises - what happens to the head pressure?
It rises
TXV
A swaging tool
It also rises

6. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
When it is above a conditioned space
Infiltration and ventilation
When it is above a conditioned space
True

7. What type of air conditioning system must be charged using the superheat method?
When it is above a conditioned space
A piston type metering device
It also rises
30 A

8. How do you calculate EER?
Common
Yes
Btu/hr (output) / wattage (input)
It will be low

9. A reciprocating compressor has what sort of moving parts?
Pistons
Boil the liquid refrigerant out ot the oil within the crankcase
Negative
Indoor fan motor - outdoor fan motor - and the compressor

10. How many amps can 8 g wire handle?
Nitrogen with a small amount of refrigerant
When it is a pull-through evaporator
8-12 degrees F
40 A

11. 13 SEER is classified as what kind of efficiency?
High
True
Dehydrated with caps on each end
A band 4 inches or more in width

12. How is flexible duct supported?
Duct with insulation on the inside
Staples and tape
Boil the liquid refrigerant out ot the oil within the crankcase
A band 4 inches or more in width

13. What gauge is thermostat wire?
400
18 gauge
Suction
140 degrees F

14. How many amps can 10 g wire handle?
With 4' saddles
30 A
40 A
By increasing the surface of the condenser coil

15. 9' round duct has a ballpark cfm of what?
300
A band 4 inches or more in width
5 degrees
Below 800 degrees F

16. At what temperature will soft solder melt?
20 degrees F
Shorted winding - open winding - and grounded winding
Below 800 degrees F
100

17. 10 SEER is classified as what kind of efficiency?
ACR (air-conditioning refrigeration) tubing
Standard
40 degrees F
No

18. The A/C size is calculated by what?
Before the vent
Heat load
6
They are physically larger

19. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
A dirty evaporator
Any amount
TXV
With an are rating

20. What is lined duct?
It also rises
Positive
Duct with insulation on the inside
High

21. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Over 800 degrees F
Nominal-sized tubing
A bypass duct or a dump zone
Outside of the male fitting

22. When must a copper joint never be soldered or brazed?
Standard
When the system is under pressure
In series
Any amount

23. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
1/4'
Indoor fan motor - outdoor fan motor - and the compressor
5 degrees

24. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
Heat load
20 degrees above ambient
2

25. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
A bypass duct or a dump zone
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Average feet per minute X area in square feet (H' x W'/144)
30 degrees F

26. How will too much refrigerant effect subcooling?
Inside diameter (ID)
A dirty evaporator
It will be high
It rises

27. 9' round duct has a ballpark cfm of what?
Dehydrated with caps on each end
300
150
Inclined manometer

28. What are the components of a hard-start kit?
Potential relay and start capacitor
30-35 degrees above ambient
30-35 degrees above ambient
It will have a decrease in superheat

29. The fan switch opens at what temperature?
It rises
It will have a decrease in superheat
2 minutes
105 degrees F

30. Do you need a vent on a push-through evaporator?
30 degrees F
2 minutes
Over/under and side by side
Yes

31. Do you need a trap on a push-through evaporator?
In parallel
A dirty evaporator
No
25-ft or 50-ft

32. What distributes supply air to a room in a structure?
TXV
In parallel
Pi x radius squared
A diffuser

33. How are round ducts supported?

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34. What are the two types of return air systems in residential installations?
It will be high
L-type
20 A
Individual return air systems and central return air systems

35. The fan switch closes at what temperature?
Duct - electrical - and mechanical
200
Pi x radius squared
140 degrees F

36. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
15 A
Inside diameter (ID)
On the common terminal

37. 10' round duct has a ballpark cfm of what?
Rise
Pistons
They are larger
400

38. How many amps can 12 g wire handle?
20 A
1/4'
Outside of the male fitting
Potential relay and start capacitor

39. The crankcase heater on an air-conditioning compressor is used to what?
It will have a decrease in superheat
Boil the liquid refrigerant out ot the oil within the crankcase
200
4

40. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
40 degrees F
8
They are physically larger
Side-by-side and over-and-under

41. If the rpm's are 3450 - how many poles does the motor have?
RLA/FLA x 5
Infiltration and ventilation
2
To lower the amount of pressure drop through the coil

42. 6' round duct has a ballpark cfm of what?
Standard
Yes
100
40 degrees F

43. If pressure rises - what happens to the superheat?
RLA/FLA x 5
It rises
Outside of the male fitting
Yes

44. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
The takeoff fitting
Standard

45. Do you need a vent on a push-through evaporator?
Heat loss
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

46. How long should you leave a system off once you kill power before restarting it?
Below 800 degrees F
S-clips and drives (cleats)
40 degrees F
2 minutes

47. What is used to measure static air pressure in ducts.
Heat load
Negative
Inclined manometer
Staples and tape

48. What do you use to check for leaks?
Over/under and side by side
Nitrogen with a small amount of refrigerant
Inclined manometer
20 degrees above ambient

49. A reciprocating compressor has what sort of moving parts?
30 A
Pistons
It will be high
RLA/FLA x 5

50. What are the three crafts normally associated with an air-conditioned installation?
5 degrees
A dirty evaporator
Indoor fan motor - outdoor fan motor - and the compressor
Duct - electrical - and mechanical