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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. 10' round duct has a ballpark cfm of what?
A piston type metering device
400
In parallel
It will have a decrease in superheat

2. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Subtract ambient temperature from 100
Heat load
30 A

3. What kind of copper tubing is used for plumbing and heating applications?
Heat load
Nominal-sized tubing
45-55%
105 degrees F

4. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
It rises
L-type
A dirty evaporator
Duct - electrical - and mechanical

5. The crankcase heater on an air-conditioning compressor is used to what?
Outside diameter (OD)
Btu/hr (output) / wattage (input)
Blended refrigerants
Boil the liquid refrigerant out ot the oil within the crankcase

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

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7. What is the range for normal superheat and subcooling?
Dehydrated with caps on each end
They are larger
When the system is under pressure
8-12 degrees F

8. How do you calculate LRA?
Btu/hr (output) / wattage (input)
Shorted winding - open winding - and grounded winding
Inclined manometer
RLA/FLA x 5

9. The furnace size is calculated by what?
40 degrees F
A swaging tool
It will be low
Heat loss

10. How many amps can 14 g wire handle?
False
Shorted winding - open winding - and grounded winding
15 A
30-35 degrees above ambient

11. What are the three crafts normally associated with an air-conditioned installation?
It rises
Duct - electrical - and mechanical
L-type
With an are rating

12. Why are some ACR tubing lines insulated?
When it is above a conditioned space
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When it is a pull-through evaporator
Pull a vacuum

13. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
True
20 degrees above ambient
When the system is under pressure

14. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Staples and tape
15 A
100

15. How long should you leave a system off once you kill power before restarting it?
30 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
2 minutes

16. What is the typical pressure differance across a TXV?
Yes
TXV
100 psig
Pull a vacuum

17. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
A bypass duct or a dump zone
Latent and sensible
Any amount
Shorted winding - open winding - and grounded winding

18. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
Boil the liquid refrigerant out ot the oil within the crankcase
Stranded
300

19. What are the three major power-consuming devices on an air-conditioning system?
Any amount
Btu/hr (output) / wattage (input)
Indoor fan motor - outdoor fan motor - and the compressor
When it is a pull-through evaporator

20. How are round ducts supported?

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21. Do you need a vent on a pull-through evaporator?
Yes
Standard
They are physically larger
100

22. What is the typical pressure differance across a TXV?
100 psig
Any amount
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
30 A

23. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
Inclined manometer
200
Outside diameter (OD)

24. How do you calculate the area of a circle?
By increasing the surface of the condenser coil
Pi x radius squared
4
100 psig

25. Most duct insulation is made of what?
In series
Heat load
Stranded
Fiberglass

26. If the rpm's are 750 - how many poles does the motor have?
Pi x radius squared
8
It also rises
A swaging tool

27. 10 SEER is classified as what kind of efficiency?
Yes
TXV
Stranded
Standard

28. How is flexible duct supported?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
A band 4 inches or more in width
25-ft or 50-ft
150

29. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
40 degrees F
When it is a pull-through evaporator
150
20 degrees F

30. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
Yes
Stranded
18 gauge

31. On what terminal do you check amperage?
Negative
Common
SEER includes the energy used in the start-up and shut-down cycles
20 degrees F

32. Where do you check the amps on a motor?
On the common terminal
400
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
400

33. What gauge is thermostat wire?
Pull a vacuum
True
18 gauge
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

34. What is the name of the fitting where the branch line leaves the duct?
They are physically larger
It also rises
The takeoff fitting
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

35. Superheat should never be below how many degrees
30 A
5 degrees
400
A piston type metering device

36. What kind of refrigeratnts must be added in liquid form?
Fiberglass
Static pressure - velocity pressure - and total pressure
105 degrees F
Blended refrigerants

37. How is ACR tubing sized?
Any amount
Outside diameter (OD)
A dirty evaporator
Outside of the male fitting

38. What tool is used to expand the diameter of soft copper tubing
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
15 A
A swaging tool
Heat load

39. The compressor is cooled by liquid refrigerant. (True of False)
2
False
400
Average feet per minute X area in square feet (H' x W'/144)

40. What is the design boiling point for most evaporator coils in residential air conditioning?
Staples and tape
40 degrees F
It rises
It will be low

41. What type of air conditioning system must be charged using the superheat method?
The suction line or the low-pressure side
30 A
Boil the liquid refrigerant out ot the oil within the crankcase
A piston type metering device

42. What is a package unit?
When the system is under pressure
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Belt drive and direct drive
A diffuser

43. How many BTU's per ton?
Any amount
12000
Duct with insulation on the inside
RLA/FLA x 5

44. 10 SEER is classified as what kind of efficiency?
40 degrees F
A band 4 inches or more in width
Standard
With an are rating

45. How many cfm per ton?
2
It will be low
Infiltration and ventilation
400

46. If the suction pressure rises - what happens to the head pressure?
40 degrees F
RLA/FLA x 5
Staples and tape
It also rises

47. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Outside of the male fitting
TXV
Pull a vacuum

48. The fan switch closes at what temperature?
It also rises
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
140 degrees F
Positive

49. Superheat should never be below how many degrees
To lower the amount of pressure drop through the coil
They are physically larger
A bypass duct or a dump zone
5 degrees

50. How are the condenser coils different on a high-efficiency unit?
Common
They are larger
40 A
Common