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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 typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
It will be high
Nitrogen with a small amount of refrigerant
Rise

2. Do you need a vent on a pull-through evaporator?
400
Yes
Potential relay and start capacitor
A dirty evaporator

3. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Outside of the male fitting
Stranded
30 degrees F
40 degrees F

4. What are the two types of return air systems in residential installations?
A band 4 inches or more in width
Duct with insulation on the inside
Individual return air systems and central return air systems
Yes

5. The crankcase heater on an air-conditioning compressor is used to what?
A piston type metering device
Yes
The takeoff fitting
Boil the liquid refrigerant out ot the oil within the crankcase

6. What is lined duct?
1/4'
Duct with insulation on the inside
Suction
Heat loss

7. How are the condenser coils different on a high-efficiency unit?
They are larger
12000
Shorted winding - open winding - and grounded winding
It will have a decrease in superheat

8. What are the three pressures created by moving air in ductwork?
Yes
18 gauge
Static pressure - velocity pressure - and total pressure
Indoor fan motor - outdoor fan motor - and the compressor

9. How are round ducts supported?

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10. What are the components of a hard-start kit?
400
Potential relay and start capacitor
Pi x radius squared
SEER includes the energy used in the start-up and shut-down cycles

11. What type of air conditioning system must be charged using the superheat method?
Dehydrated with caps on each end
It will have a decrease in superheat
Pi x radius squared
A piston type metering device

12. How is insulation around a duct rated?
To lower the amount of pressure drop through the coil
2
100
With an are rating

13. A reciprocating compressor has what sort of moving parts?
It will have a decrease in superheat
Heat loss
Pistons
Below 800 degrees F

14. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Over/under and side by side
20 A
No
True

15. What is the design boiling point for most evaporator coils in residential air conditioning?
Inside diameter (ID)
40 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
30-35 degrees above ambient

16. How do you calculate EER?
Rise
Inches of water column (in. WC)
Btu/hr (output) / wattage (input)
Yes

17. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
No
8
To lower the amount of pressure drop through the coil
Compressor

18. The A/C size is calculated by what?
20 degrees F
4
A bypass duct or a dump zone
Heat load

19. Pressure in ductwork is measured In what?
15 A
With a minimum of three evenly spaced self-tapping screws
Standard
Inches of water column (in. WC)

20. In what length rolls is soft copper tubing normally available?
To remove humidity and lower dry bulb temperature
It will be low
Vapor
25-ft or 50-ft

21. What is considered normal operating conditions?
Latent and sensible
To lower the amount of pressure drop through the coil
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
False

22. 7' round duct has a ballpark cfm of what?
100 psig
2 minutes
TXV
150

23. How is insulation around a duct rated?
S-clips and drives (cleats)
With an are rating
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

24. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
20 A
In series
5 degrees
S-clips and drives (cleats)

25. What tool is used to expand the diameter of soft copper tubing
No
To lower the amount of pressure drop through the coil
A swaging tool
Standard

26. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes
A dirty evaporator

27. What is the design boiling point for most evaporator coils in residential air conditioning?
Before the vent
300
40 degrees F
Inside diameter (ID)

28. Do you need a vent on a push-through evaporator?
Yes
Common
105 degrees F
No

29. How will too much refrigerant effect superheat?
40 degrees F
Before the vent
300
It will be low

30. Which type of wire can handle a higher ampacity?
Stranded
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
105 degrees F
TXV

31. 13 SEER is classified as what kind of efficiency?
ACR (air-conditioning refrigeration) tubing
It will be high
Staples and tape
High

32. How are round ducts supported?

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33. What component changes refrigerant from a low pressure gas to a high pressure gas?
Slugging
On the common terminal
Yes
Compressor

34. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
40 A
A band 4 inches or more in width
They are physically larger

35. What is the normal evaporator temperature?
40 degrees F
45 degrees F
Duct with insulation on the inside
It will be low

36. What are the four materials used to make duct?
20 A
Below 800 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
It will have a decrease in superheat

37. Where do you check the amps on a motor?
They are physically larger
200
On the common terminal
Dehydrated with caps on each end

38. How many amps can 8 g wire handle?
Fiberglass
40 A
Pi x radius squared
20 degrees above ambient

39. If the rpm's are 3450 - how many poles does the motor have?
2
Common
Blended refrigerants
Rise

40. Will a dirty condenser cause a rise or fall in pressure?
100 psig
Over 800 degrees F
Rise
Infiltration and ventilation

41. How will too much refrigerant effect subcooling?
Pi x radius squared
Subtract ambient temperature from 100
Vapor
It will be high

42. What kind of metering device do high-efficiency units usually use?
150
TXV
They are physically larger
RLA/FLA x 5

43. Sections of duct board can be fastened together with what?
A dirty evaporator
Dehydrated with caps on each end
Belt drive and direct drive
Staples and tape

44. The fan switch opens at what temperature?
Individual return air systems and central return air systems
40 degrees F
105 degrees F
Subtract ambient temperature from 100

45. What kind of refrigeratnts must be added in liquid form?
TXV
With a minimum of three evenly spaced self-tapping screws
Blended refrigerants
Inside diameter (ID)

46. How is nominal-sized tubing sized?
SEER includes the energy used in the start-up and shut-down cycles
To lower the amount of pressure drop through the coil
300
Inside diameter (ID)

47. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Yes
20 degrees F
Btu/hr (output) / wattage (input)
ACR (air-conditioning refrigeration) tubing

48. What is used to measure static air pressure in ducts.
Inclined manometer
Common
With 4' saddles
45 degrees F

49. Does a package unit come from the factory pre-charged?
100 psig
Infiltration and ventilation
Yes
100 psig

50. How many amps can 12 g wire handle?
15% silphos
4
False
20 A