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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 are normal conditions - as defined by the ARI.
S-clips and drives (cleats)
They are physically larger
8
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

2. What is lined duct?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Staples and tape
140 degrees F
Duct with insulation on the inside

3. How many amps can 10 g wire handle?
18 gauge
30 A
Stranded
The suction line or the low-pressure side

4. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
Any amount
ACR (air-conditioning refrigeration) tubing
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

5. Most duct insulation is made of what?
Fiberglass
A swaging tool
TXV
45-55%

6. How long should you leave a system off once you kill power before restarting it?
2 minutes
45 degrees F
Side-by-side and over-and-under
Static pressure - velocity pressure - and total pressure

7. What is used to measure static air pressure in ducts.
Inclined manometer
Side-by-side and over-and-under
Dehydrated with caps on each end
Boil the liquid refrigerant out ot the oil within the crankcase

8. If the rpm's are 1750 - how many poles does the motor have?
4
30-35 degrees above ambient
Positive
A bypass duct or a dump zone

9. When do you install a trap on a drain line?
5 degrees
When it is a pull-through evaporator
1/4'
High

10. Will a dirty condenser cause a rise or fall in pressure?
Nominal-sized tubing
300
Potential relay and start capacitor
Rise

11. What is used to measure static air pressure in ducts.
On the common terminal
40 A
Inclined manometer
Rise

12. The A/C size is calculated by what?
105 degrees F
Below 800 degrees F
Pull a vacuum
Heat load

13. How are the condenser coils different on a high-efficiency unit?
Pi x radius squared
They are larger
Below 800 degrees F
400

14. How many amps can 14 g wire handle?
15 A
ACR (air-conditioning refrigeration) tubing
Vapor
40 degrees F

15. How many BTU's per ton?
Yes
Average feet per minute X area in square feet (H' x W'/144)
12000
Nominal-sized tubing

16. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
140 degrees F
They are physically larger
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants

17. At what temperature does refrigerant condense in a high-efficiency unit?
30 degrees F
Pull a vacuum
20 degrees above ambient
18 gauge

18. What is the typical pressure differance across a TXV?
It also rises
400
15% silphos
100 psig

19. How long should you leave a system off once you kill power before restarting it?
Heat loss
2 minutes
It also rises
45-55%

20. How are round ducts connected to one another?
Yes
No
With a minimum of three evenly spaced self-tapping screws
30 degrees F

21. What can cause a decrease in suction pressure on an air-conditioning system?
True
With an are rating
A dirty evaporator
Yes

22. What kind of metering device do high-efficiency units usually use?
A piston type metering device
When the system is under pressure
TXV
30 degrees F

23. 13 SEER is classified as what kind of efficiency?
High
Suction
45-55%
20 degrees F

24. How many cfm per ton?
30-35 degrees above ambient
It will have a decrease in superheat
400
Yes

25. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
45-55%
A swaging tool
When it is above a conditioned space

26. If pressure rises - what happens to the superheat?
2
100 psig
It rises
It will be high

27. How are round ducts supported?

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28. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
No
Common
In series
45 degrees F

29. When do you install a trap on a drain line?
S-clips and drives (cleats)
In parallel
Nominal-sized tubing
When it is a pull-through evaporator

30. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
Vapor
Heat loss
400

31. What do you do after you braze a system?
150
Pull a vacuum
12000
400

32. What are the three crafts normally associated with an air-conditioned installation?
Vapor
It also rises
25-ft or 50-ft
Duct - electrical - and mechanical

33. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
Over 800 degrees F
4
Infiltration and ventilation

34. What are the two types of blower drives?
Belt drive and direct drive
Pistons
When it is above a conditioned space
A swaging tool

35. What is the typical pressure differance across a TXV?
ACR (air-conditioning refrigeration) tubing
100 psig
Inside diameter (ID)
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

36. Which is more efficient - a TXV or a fixed-orifice metering device?
To lower the amount of pressure drop through the coil
Common
TXV
30-35 degrees above ambient

37. How do you calculate ballpark superheat?
Yes
Subtract ambient temperature from 100
2 minutes
TXV

38. What are the components of a hard-start kit?
Heat loss
Potential relay and start capacitor
Indoor fan motor - outdoor fan motor - and the compressor
400

39. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Yes
L-type
Below 800 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase

40. How do you achieve high-efficiency?
100
By increasing the surface of the condenser coil
TXV
Infiltration and ventilation

41. What tool is used to expand the diameter of soft copper tubing
Outside diameter (OD)
A swaging tool
150
To remove humidity and lower dry bulb temperature

42. What do you use to check for leaks?
In series
No
Nitrogen with a small amount of refrigerant
30 A

43. Can refrigerant line sets be altered in length?
Yes
SEER includes the energy used in the start-up and shut-down cycles
To remove humidity and lower dry bulb temperature
15% silphos

44. What is the difference between SEER and EER?
Standard
Below 800 degrees F
Side-by-side and over-and-under
SEER includes the energy used in the start-up and shut-down cycles

45. What are the two types of package units?
Pi x radius squared
Nominal-sized tubing
By increasing the surface of the condenser coil
Side-by-side and over-and-under

46. The compressor is cooled by liquid refrigerant. (True of False)
Blended refrigerants
False
4
Potential relay and start capacitor

47. What is lined duct?
Indoor fan motor - outdoor fan motor - and the compressor
100
Duct with insulation on the inside
Pistons

48. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Yes
The takeoff fitting
In series
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

49. 10' round duct has a ballpark cfm of what?
By increasing the surface of the condenser coil
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
400
A band 4 inches or more in width

50. How will too much refrigerant effect superheat?
400
A bypass duct or a dump zone
It will be low
With an are rating