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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 kind of metering device do high-efficiency units usually use?
TXV
Boil the liquid refrigerant out ot the oil within the crankcase
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
30-35 degrees above ambient

2. What are the components of a hard-start kit?
100
200
Potential relay and start capacitor
It rises

3. How does ACR copper pipe come?
Over/under and side by side
TXV
When the system is under pressure
Dehydrated with caps on each end

4. What do you use to connect square and rectangular ductboard together?
Over 800 degrees F
Shorted winding - open winding - and grounded winding
S-clips and drives (cleats)
2

5. If pressure rises - what happens to the superheat?
It rises
Heat load
45-55%
5 degrees

6. How is ACR tubing sized?
Outside diameter (OD)
Latent and sensible
15 A
400

7. What distributes supply air to a room in a structure?
A diffuser
Pistons
6
15 A

8. If the suction pressure rises - what happens to the head pressure?
Compressor
It also rises
Blended refrigerants
By increasing the surface of the condenser coil

9. What are the two types of return air systems in residential installations?
15% silphos
Duct with insulation on the inside
20 degrees above ambient
Individual return air systems and central return air systems

10. In what state is the refrigerant in the compressor?
Pull a vacuum
With a minimum of three evenly spaced self-tapping screws
200
Vapor

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

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12. The load on the evaporater will effect which pressure?
Suction
It rises
15 A
In series

13. The crankcase heater on an air-conditioning compressor is used to what?
False
Boil the liquid refrigerant out ot the oil within the crankcase
A band 4 inches or more in width
A bypass duct or a dump zone

14. What gauge is thermostat wire?
Yes
By increasing the surface of the condenser coil
True
18 gauge

15. What is considered normal operating conditions?
It will have a decrease in superheat
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It will be high
Boil the liquid refrigerant out ot the oil within the crankcase

16. Do you need a vent on a push-through evaporator?
Any amount
Yes
Any amount
When it is above a conditioned space

17. If the suction pressure rises - what happens to the head pressure?
It also rises
Infiltration and ventilation
RLA/FLA x 5
18 gauge

18. The fan switch opens at what temperature?
25-ft or 50-ft
Vapor
When it is above a conditioned space
105 degrees F

19. What is the range for normal superheat and subcooling?
8-12 degrees F
45 degrees F
6
Outside of the male fitting

20. What are the three pressures created by moving air in ductwork?
TXV
Side-by-side and over-and-under
105 degrees F
Static pressure - velocity pressure - and total pressure

21. How many BTU's per ton?
With 4' saddles
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Pistons
12000

22. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
With an are rating
Inclined manometer
Duct with insulation on the inside

23. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
1/4'
Pi x radius squared
To remove humidity and lower dry bulb temperature

24. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
It will be low
Before the vent
RLA/FLA x 5

25. What sort of pressure will a pull-through evaporator have?
Negative
Yes
15 A
Btu/hr (output) / wattage (input)

26. 10 SEER is classified as what kind of efficiency?
TXV
Any amount
Standard
Heat loss

27. How long should you leave a system off once you kill power before restarting it?
Yes
4
45-55%
2 minutes

28. What kind of copper tubing is used for plumbing and heating applications?
It will be high
Heat load
By increasing the surface of the condenser coil
Nominal-sized tubing

29. How will too much refrigerant effect superheat?
TXV
It will be low
5 degrees
400

30. What tool is used to expand the diameter of soft copper tubing
A swaging tool
It will be low
8-12 degrees F
Infiltration and ventilation

31. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Before the vent
Shorted winding - open winding - and grounded winding
When the system is under pressure
A bypass duct or a dump zone

32. What is it called when liquid refrigerant gets into the compressor?
Heat load
It will be high
30-35 degrees above ambient
Slugging

33. Will a dirty condenser cause a rise or fall in pressure?
When the system is under pressure
1/4'
Rise
The takeoff fitting

34. What type of air conditioning system must be charged using the superheat method?
8-12 degrees F
30 A
2
A piston type metering device

35. If the rpm's are 3450 - how many poles does the motor have?
2
45 degrees F
Staples and tape
400

36. 8' round duct has a ballpark cfm of what?
20 A
40 A
4
200

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

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38. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
It rises
Yes
45-55%

39. When do you install a trap on a drain line?
True
100
When it is a pull-through evaporator
No

40. When do you install an auxillary drain pan?
Stranded
18 gauge
When it is above a conditioned space
S-clips and drives (cleats)

41. How is the high pressure switch wired with the low pressure switch?
TXV
Pi x radius squared
Individual return air systems and central return air systems
In parallel

42. Pressure in ductwork is measured In what?
Blended refrigerants
Inches of water column (in. WC)
High
It also rises

43. What kind of copper tubing is used for refrigeration or air-conditioning applications?
In series
Blended refrigerants
To lower the amount of pressure drop through the coil
ACR (air-conditioning refrigeration) tubing

44. 10' round duct has a ballpark cfm of what?
15% silphos
400
Staples and tape
Fiberglass

45. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
200
Boil the liquid refrigerant out ot the oil within the crankcase
Heat loss

46. How do you calculate ballpark superheat?
With a minimum of three evenly spaced self-tapping screws
Subtract ambient temperature from 100
Latent and sensible
6

47. What are the three crafts normally associated with an air-conditioned installation?
Potential relay and start capacitor
A bypass duct or a dump zone
150
Duct - electrical - and mechanical

48. What are the two basic duct connection configurations for package units supply and return air ducts?
Belt drive and direct drive
Subtract ambient temperature from 100
Nominal-sized tubing
Over/under and side by side

49. Why are some ACR tubing lines insulated?
Average feet per minute X area in square feet (H' x W'/144)
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
On the common terminal
Outside of the male fitting

50. What is the name of the fitting where the branch line leaves the duct?
It will be low
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
The takeoff fitting
ACR (air-conditioning refrigeration) tubing