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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. Do you need a trap on a pull-through evaporator?
100
20 A
Heat loss
Yes

2. How is ACR tubing sized?
A diffuser
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
Outside diameter (OD)

3. Do you need a trap on a pull-through evaporator?
40 A
Fiberglass
Duct - electrical - and mechanical
Yes

4. What are the three pressures created by moving air in ductwork?
It will have a decrease in superheat
With a minimum of three evenly spaced self-tapping screws
Static pressure - velocity pressure - and total pressure
It will be high

5. What is used to measure static air pressure in ducts.
150
To remove humidity and lower dry bulb temperature
Yes
Inclined manometer

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

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7. How do you achieve high-efficiency?
20 degrees above ambient
40 degrees F
By increasing the surface of the condenser coil
18 gauge

8. At what temperature does refrigerant condense in a high-efficiency unit?
40 A
Yes
30-35 degrees above ambient
20 degrees above ambient

9. How do you calculate cfm?

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10. How will too much refrigerant effect superheat?
20 degrees above ambient
Btu/hr (output) / wattage (input)
40 degrees F
It will be low

11. Do you need a vent on a pull-through evaporator?
Yes
2 minutes
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
A diffuser

12. Superheat should never be below how many degrees
On the common terminal
Btu/hr (output) / wattage (input)
5 degrees
A diffuser

13. What is used to measure static air pressure in ducts.
Inclined manometer
20 A
ACR (air-conditioning refrigeration) tubing
When it is a pull-through evaporator

14. Will a dirty condenser cause a rise or fall in pressure?
Pull a vacuum
Rise
It will have a decrease in superheat
20 degrees F

15. Where do you install a trap on a drain line?
Yes
Common
Before the vent
False

16. How are round ducts connected to one another?
Vapor
With a minimum of three evenly spaced self-tapping screws
Nitrogen with a small amount of refrigerant
Shorted winding - open winding - and grounded winding

17. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
100 psig
300
When the system is under pressure

18. 7' round duct has a ballpark cfm of what?
Outside of the male fitting
It will be low
150
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

19. How many amps can 8 g wire handle?
20 degrees above ambient
With a minimum of three evenly spaced self-tapping screws
Latent and sensible
40 A

20. The compressor is cooled by liquid refrigerant. (True of False)
40 degrees F
TXV
False
TXV

21. The crankcase heater on an air-conditioning compressor is used to what?
Staples and tape
Boil the liquid refrigerant out ot the oil within the crankcase
8
30 degrees F

22. What kind of metering device do high-efficiency units usually use?
Suction
TXV
Subtract ambient temperature from 100
The takeoff fitting

23. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
1/4'
To lower the amount of pressure drop through the coil
It rises
Before the vent

24. How is insulation around a duct rated?
With an are rating
Latent and sensible
L-type
High

25. At what temperature will soft solder melt?
It also rises
When it is a pull-through evaporator
Below 800 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

26. How do you calculate ballpark superheat?
Below 800 degrees F
Subtract ambient temperature from 100
40 degrees F
To remove humidity and lower dry bulb temperature

27. Can refrigerant line sets be altered in length?
Yes
5 degrees
Any amount
With a minimum of three evenly spaced self-tapping screws

28. What do you use to check for leaks?
By increasing the surface of the condenser coil
Nitrogen with a small amount of refrigerant
40 degrees F
20 A

29. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
With 4' saddles
Fiberglass
A bypass duct or a dump zone
It will have a decrease in superheat

30. How many amps can 14 g wire handle?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Below 800 degrees F
Fiberglass
15 A

31. Sections of duct board can be fastened together with what?
Inside diameter (ID)
Dehydrated with caps on each end
Staples and tape
Slugging

32. If the suction pressure rises - what happens to the head pressure?
With 4' saddles
Side-by-side and over-and-under
When the system is under pressure
It also rises

33. What gauge is thermostat wire?
18 gauge
A swaging tool
Average feet per minute X area in square feet (H' x W'/144)
105 degrees F

34. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
20 degrees F
2
RLA/FLA x 5

35. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
100
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
30 degrees F
With 4' saddles

36. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Individual return air systems and central return air systems
SEER includes the energy used in the start-up and shut-down cycles
The suction line or the low-pressure side

37. At what temperature will brazing melt?
Btu/hr (output) / wattage (input)
8-12 degrees F
Over 800 degrees F
Infiltration and ventilation

38. If pressure rises - what happens to the superheat?
It rises
L-type
1/4'
A dirty evaporator

39. 10 SEER is classified as what kind of efficiency?
40 A
Standard
Yes
They are physically larger

40. How does ACR copper pipe come?
8
45 degrees F
False
Dehydrated with caps on each end

41. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
Before the vent
200
Shorted winding - open winding - and grounded winding

42. 13 SEER is classified as what kind of efficiency?
The takeoff fitting
High
Yes
When the system is under pressure

43. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
Duct - electrical - and mechanical
A dirty evaporator
Slugging

44. The evaporator is designed to remove what two types of heat?
Latent and sensible
They are physically larger
High
Pi x radius squared

45. At what temperature will soft solder melt?
Before the vent
Over/under and side by side
Below 800 degrees F
Compressor

46. How do you calculate cfm?

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47. What is the difference between SEER and EER?
400
It rises
In series
SEER includes the energy used in the start-up and shut-down cycles

48. How is the high pressure switch wired with the low pressure switch?
Compressor
On the common terminal
In parallel
15% silphos

49. 8' round duct has a ballpark cfm of what?
100
2 minutes
140 degrees F
200

50. How long should you leave a system off once you kill power before restarting it?
The suction line or the low-pressure side
RLA/FLA x 5
2 minutes
Common