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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. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Any amount
45-55%
They are physically larger
With an are rating

2. If pressure rises - what happens to the superheat?
It will have a decrease in superheat
40 A
It rises
Pull a vacuum

3. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
45 degrees F
140 degrees F
Suction

4. What are the components of a hard-start kit?
In series
Potential relay and start capacitor
Yes
8

5. How long should you leave a system off once you kill power before restarting it?
Boil the liquid refrigerant out ot the oil within the crankcase
Latent and sensible
Pistons
2 minutes

6. What percentage silver do you need to use for an are-410 system?
4
15% silphos
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
40 degrees F

7. How many amps can 14 g wire handle?
100
A bypass duct or a dump zone
15 A
Pistons

8. How are the condenser coils different on a high-efficiency unit?
They are larger
Pi x radius squared
40 degrees F
When it is above a conditioned space

9. What is the range for normal superheat and subcooling?
Duct with insulation on the inside
Inside diameter (ID)
8-12 degrees F
2 minutes

10. How many BTU's per ton?
40 degrees F
L-type
12000
False

11. What do you use to connect square and rectangular ductboard together?
It also rises
S-clips and drives (cleats)
Positive
Nitrogen with a small amount of refrigerant

12. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Fiberglass
Infiltration and ventilation
Stranded
A bypass duct or a dump zone

13. What type of air conditioning system must be charged using the superheat method?
Individual return air systems and central return air systems
In parallel
Nominal-sized tubing
A piston type metering device

14. Will a dirty condenser cause a rise or fall in pressure?
The takeoff fitting
Pi x radius squared
15 A
Rise

15. What do you do after you braze a system?
A diffuser
Any amount
150
Pull a vacuum

16. What sort of pressure will a pull-through evaporator have?
Subtract ambient temperature from 100
Inside diameter (ID)
Negative
On the common terminal

17. If pressure rises - what happens to the superheat?
4
Staples and tape
It rises
Dehydrated with caps on each end

18. How are round ducts supported?

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19. 7' round duct has a ballpark cfm of what?
150
18 gauge
Potential relay and start capacitor
Over 800 degrees F

20. What kind of metering device do high-efficiency units usually use?
30 A
Yes
TXV
Yes

21. Superheat should never be below how many degrees
Rise
Compressor
5 degrees
When it is a pull-through evaporator

22. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
It will have a decrease in superheat
To lower the amount of pressure drop through the coil
Belt drive and direct drive
40 degrees F

23. What distributes supply air to a room in a structure?
2 minutes
They are larger
A diffuser
Yes

24. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
18 gauge
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
6

25. At what temperature will brazing melt?
40 degrees F
Over 800 degrees F
15% silphos
Inside diameter (ID)

26. The evaporator is designed to remove what two types of heat?
Heat load
The suction line or the low-pressure side
Latent and sensible
150

27. The fan switch closes at what temperature?
With 4' saddles
300
140 degrees F
2

28. What is it called when liquid refrigerant gets into the compressor?
A diffuser
Slugging
Rise
Yes

29. How many amps can 10 g wire handle?
Common
30 A
A piston type metering device
1/4'

30. Where do you check the amps on a motor?
It will be high
200
Rise
On the common terminal

31. When must a copper joint never be soldered or brazed?
To lower the amount of pressure drop through the coil
When the system is under pressure
RLA/FLA x 5
Latent and sensible

32. How is flexible duct supported?
A band 4 inches or more in width
Rise
20 degrees F
Before the vent

33. The load on the evaporater will effect which pressure?
Suction
200
L-type
Pistons

34. What kind of refrigeratnts must be added in liquid form?
30 A
Blended refrigerants
Latent and sensible
Btu/hr (output) / wattage (input)

35. 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
True
Heat loss
Positive

36. What are the two types of package units?
1/4'
2 minutes
Side-by-side and over-and-under
Nominal-sized tubing

37. What is the design boiling point for most evaporator coils in residential air conditioning?
It will be high
Blended refrigerants
In series
40 degrees F

38. How many amps can 12 g wire handle?
To remove humidity and lower dry bulb temperature
20 A
It will have a decrease in superheat
30 degrees F

39. Do you need a vent on a push-through evaporator?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
When the system is under pressure
Yes
Rise

40. If the rpm's are 750 - how many poles does the motor have?
8
It will have a decrease in superheat
Blended refrigerants
Yes

41. The fan switch opens at what temperature?
They are larger
105 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pull a vacuum

42. A reciprocating compressor has what sort of moving parts?
Indoor fan motor - outdoor fan motor - and the compressor
Blended refrigerants
12000
Pistons

43. The evaporator is designed to remove what two types of heat?
Positive
Pi x radius squared
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Latent and sensible

44. Will a dirty condenser cause a rise or fall in pressure?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Standard
30 A
Rise

45. How do you calculate EER?
Btu/hr (output) / wattage (input)
Yes
1/4'
100 psig

46. What are the four materials used to make duct?
Blended refrigerants
18 gauge
With 4' saddles
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

47. 6' round duct has a ballpark cfm of what?
20 degrees above ambient
100
Btu/hr (output) / wattage (input)
In series

48. When do you install an auxillary drain pan?
When it is above a conditioned space
8
In series
It also rises

49. Where do you check the amps on a motor?
On the common terminal
100
Subtract ambient temperature from 100
150

50. The A/C size is calculated by what?
True
Heat load
20 degrees F
The takeoff fitting