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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 long should you leave a system off once you kill power before restarting it?
2 minutes
100
L-type
Staples and tape

2. If the rpm's are 3450 - how many poles does the motor have?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Yes
2
Rise

3. How many amps can 14 g wire handle?
ACR (air-conditioning refrigeration) tubing
15 A
12000
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

4. Which is more efficient - a TXV or a fixed-orifice metering device?
Pi x radius squared
TXV
Over/under and side by side
Inclined manometer

5. How are the condenser coils different on a high-efficiency unit?
Inches of water column (in. WC)
They are larger
18 gauge
25-ft or 50-ft

6. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
TXV
A bypass duct or a dump zone
2 minutes
105 degrees F

7. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Negative
Yes
They are physically larger
To lower the amount of pressure drop through the coil

8. The fan switch closes at what temperature?
140 degrees F
Outside diameter (OD)
Dehydrated with caps on each end
On the common terminal

9. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
RLA/FLA x 5
Fiberglass
Yes

10. In what state is the refrigerant in the compressor?
Vapor
Infiltration and ventilation
Indoor fan motor - outdoor fan motor - and the compressor
Fiberglass

11. What is the design boiling point for most evaporator coils in residential air conditioning?
A piston type metering device
S-clips and drives (cleats)
45-55%
40 degrees F

12. Which type of wire can handle a higher ampacity?
400
Stranded
In parallel
Boil the liquid refrigerant out ot the oil within the crankcase

13. The compressor is cooled by liquid refrigerant. (True of False)
False
Below 800 degrees F
In parallel
1/4'

14. Does a package unit come from the factory pre-charged?
A dirty evaporator
Yes
200
Shorted winding - open winding - and grounded winding

15. What is used to measure static air pressure in ducts.
Staples and tape
The takeoff fitting
Inclined manometer
Latent and sensible

16. Where do you check the amps on a motor?
S-clips and drives (cleats)
Suction
On the common terminal
8-12 degrees F

17. What are the three pressures created by moving air in ductwork?
Infiltration and ventilation
40 degrees F
Static pressure - velocity pressure - and total pressure
Heat loss

18. At what temperature does refrigerant condense in a high-efficiency unit?
Infiltration and ventilation
Before the vent
20 degrees above ambient
Static pressure - velocity pressure - and total pressure

19. Where do you install a trap on a drain line?
300
Before the vent
20 A
Average feet per minute X area in square feet (H' x W'/144)

20. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It will have a decrease in superheat
Outside of the male fitting
100

21. The A/C size is calculated by what?
45-55%
Any amount
Heat load
Belt drive and direct drive

22. A reciprocating compressor has what sort of moving parts?
When the system is under pressure
Inches of water column (in. WC)
Pistons
Heat loss

23. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
With 4' saddles
A diffuser
Yes

24. Where do you check the amps on a motor?
SEER includes the energy used in the start-up and shut-down cycles
Heat load
Static pressure - velocity pressure - and total pressure
On the common terminal

25. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
20 A
400
It will have a decrease in superheat
5 degrees

26. Where do you install a trap on a drain line?
Potential relay and start capacitor
Shorted winding - open winding - and grounded winding
Before the vent
It will be low

27. What do you do after you braze a system?
Outside of the male fitting
Pull a vacuum
Inclined manometer
8

28. What are normal conditions - as defined by the ARI.
Staples and tape
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
5 degrees
2

29. The fan switch opens at what temperature?
Inclined manometer
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
105 degrees F
150

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

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31. How will too much refrigerant effect superheat?
It will be low
A bypass duct or a dump zone
It also rises
Infiltration and ventilation

32. What type of air conditioning system must be charged using the superheat method?
To remove humidity and lower dry bulb temperature
A piston type metering device
Duct with insulation on the inside
Subtract ambient temperature from 100

33. Do you need a vent on a push-through evaporator?
They are physically larger
Heat loss
45-55%
Yes

34. What is used to measure static air pressure in ducts.
Inclined manometer
The takeoff fitting
5 degrees
When it is above a conditioned space

35. What is lined duct?
Duct with insulation on the inside
Common
Subtract ambient temperature from 100
Pull a vacuum

36. What are the two types of package units?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Potential relay and start capacitor
Side-by-side and over-and-under
Pistons

37. 13 SEER is classified as what kind of efficiency?
High
100
A band 4 inches or more in width
Before the vent

38. Do you need a vent on a pull-through evaporator?
Yes
Positive
Side-by-side and over-and-under
Any amount

39. How do you calculate ballpark superheat?
Staples and tape
Subtract ambient temperature from 100
Boil the liquid refrigerant out ot the oil within the crankcase
20 degrees F

40. If the rpm's are 1050 - how many poles does the motor have?
6
L-type
45 degrees F
Outside diameter (OD)

41. The fan switch opens at what temperature?
20 A
100 psig
Rise
105 degrees F

42. Superheat should never be below how many degrees
Fiberglass
Over/under and side by side
5 degrees
Pull a vacuum

43. At what temperature will brazing melt?
Over 800 degrees F
L-type
It will be high
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

44. What are the three major power-consuming devices on an air-conditioning system?
Over/under and side by side
Negative
Indoor fan motor - outdoor fan motor - and the compressor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

45. The furnace size is calculated by what?
By increasing the surface of the condenser coil
Heat loss
105 degrees F
Outside diameter (OD)

46. How do you calculate ballpark superheat?
Compressor
Subtract ambient temperature from 100
Inclined manometer
Inclined manometer

47. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Yes
Heat loss
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
40 degrees F

48. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
L-type
Over 800 degrees F
In parallel

49. A reciprocating compressor has what sort of moving parts?
Static pressure - velocity pressure - and total pressure
Pistons
Rise
It will be low

50. What tool is used to expand the diameter of soft copper tubing
Yes
Stranded
Nominal-sized tubing
A swaging tool