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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 difference between SEER and EER?
45 degrees F
SEER includes the energy used in the start-up and shut-down cycles
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Nitrogen with a small amount of refrigerant

2. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
In parallel
Pull a vacuum
Static pressure - velocity pressure - and total pressure
A bypass duct or a dump zone

3. What is the typical pressure differance across a TXV?
100 psig
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Duct with insulation on the inside
TXV

4. Where do you check the amps on a motor?
With 4' saddles
It will have a decrease in superheat
A bypass duct or a dump zone
On the common terminal

5. Do you need a trap on a push-through evaporator?
No
400
A diffuser
Dehydrated with caps on each end

6. Why are some ACR tubing lines insulated?
Duct with insulation on the inside
105 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
20 degrees above ambient

7. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Slugging
5 degrees
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
45-55%

8. The evaporator is designed to remove what two types of heat?
Latent and sensible
TXV
150
A diffuser

9. Where do you install a trap on a drain line?
Heat load
Before the vent
Inches of water column (in. WC)
20 A

10. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
400
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

11. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
8
4
L-type
TXV

12. If the suction pressure rises - what happens to the head pressure?
Side-by-side and over-and-under
Inches of water column (in. WC)
It also rises
High

13. What are normal conditions - as defined by the ARI.
SEER includes the energy used in the start-up and shut-down cycles
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
In series
Slugging

14. What distributes supply air to a room in a structure?
Inclined manometer
To lower the amount of pressure drop through the coil
Any amount
A diffuser

15. When do you install a trap on a drain line?
On the common terminal
When it is a pull-through evaporator
Heat loss
Side-by-side and over-and-under

16. How does ACR copper pipe come?
High
Dehydrated with caps on each end
Yes
150

17. How is the high pressure switch wired with the low pressure switch?
The takeoff fitting
On the common terminal
It will be high
In parallel

18. The crankcase heater on an air-conditioning compressor is used to what?
30 degrees F
Pi x radius squared
Boil the liquid refrigerant out ot the oil within the crankcase
A swaging tool

19. If pressure rises - what happens to the superheat?
It rises
Shorted winding - open winding - and grounded winding
With a minimum of three evenly spaced self-tapping screws
40 degrees F

20. What is the design boiling point for most evaporator coils in residential air conditioning?
A bypass duct or a dump zone
40 degrees F
Inside diameter (ID)
Pull a vacuum

21. How are round ducts connected to one another?
Nitrogen with a small amount of refrigerant
It will be high
With a minimum of three evenly spaced self-tapping screws
Potential relay and start capacitor

22. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
S-clips and drives (cleats)
True
Infiltration and ventilation

23. 10' round duct has a ballpark cfm of what?
400
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
30 A
8-12 degrees F

24. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
It also rises
Any amount
300
Standard

25. What are the three pressures created by moving air in ductwork?
140 degrees F
20 degrees F
Static pressure - velocity pressure - and total pressure
Pistons

26. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
15 A
5 degrees
Nitrogen with a small amount of refrigerant

27. How do you calculate cfm?

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28. Sections of duct board can be fastened together with what?
Staples and tape
Average feet per minute X area in square feet (H' x W'/144)
Yes
30 degrees F

29. What kind of refrigeratnts must be added in liquid form?
140 degrees F
Blended refrigerants
8-12 degrees F
20 degrees above ambient

30. How is the high pressure switch wired with the low pressure switch?
18 gauge
In parallel
Latent and sensible
150

31. What gauge is thermostat wire?
18 gauge
4
5 degrees
12000

32. What kind of metering device do high-efficiency units usually use?
TXV
Staples and tape
A bypass duct or a dump zone
Latent and sensible

33. How are the condenser coils different on a high-efficiency unit?
They are larger
2 minutes
A diffuser
30 degrees F

34. The furnace size is calculated by what?
L-type
Heat loss
18 gauge
6

35. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Standard
20 degrees F
Yes

36. How will too much refrigerant effect superheat?
It rises
It will be low
In parallel
Yes

37. Superheat should never be below how many degrees
L-type
Infiltration and ventilation
It will be low
5 degrees

38. What are the three major power-consuming devices on an air-conditioning system?
12000
A piston type metering device
Indoor fan motor - outdoor fan motor - and the compressor
Average feet per minute X area in square feet (H' x W'/144)

39. What are the components of a hard-start kit?
Pull a vacuum
To remove humidity and lower dry bulb temperature
Potential relay and start capacitor
Suction

40. What is the name of the fitting where the branch line leaves the duct?
It rises
The takeoff fitting
Shorted winding - open winding - and grounded winding
A bypass duct or a dump zone

41. At what temperature will soft solder melt?
20 degrees F
Static pressure - velocity pressure - and total pressure
Below 800 degrees F
105 degrees F

42. What percentage silver do you need to use for an are-410 system?
It also rises
Outside diameter (OD)
TXV
15% silphos

43. Do you need a vent on a push-through evaporator?
400
Yes
40 degrees F
200

44. What is it called when liquid refrigerant gets into the compressor?
TXV
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Slugging
1/4'

45. What component changes refrigerant from a low pressure gas to a high pressure gas?
45 degrees F
S-clips and drives (cleats)
Compressor
8

46. How many amps can 14 g wire handle?
Boil the liquid refrigerant out ot the oil within the crankcase
Over 800 degrees F
15 A
ACR (air-conditioning refrigeration) tubing

47. What are the two types of blower drives?
It will have a decrease in superheat
18 gauge
Belt drive and direct drive
400

48. How many amps can 8 g wire handle?
It will be low
When it is a pull-through evaporator
40 A
Staples and tape

49. What are normal conditions - as defined by the ARI.
Nominal-sized tubing
Btu/hr (output) / wattage (input)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It also rises

50. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
100 psig
They are physically larger
2
To remove humidity and lower dry bulb temperature