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Residential Air Conditioning

Instructions:

Answer 50 questions in 15 minutes.
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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 the two basic duct connection configurations for package units supply and return air ducts?
105 degrees F
Heat loss
It also rises
Over/under and side by side

2. What kind of metering device do high-efficiency units usually use?
TXV
In parallel
40 A
300

3. How is ACR tubing sized?
Boil the liquid refrigerant out ot the oil within the crankcase
With an are rating
Outside diameter (OD)
200

4. How do you calculate cfm?

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5. Which type of wire can handle a higher ampacity?
SEER includes the energy used in the start-up and shut-down cycles
Slugging
S-clips and drives (cleats)
Stranded

6. In what length rolls is soft copper tubing normally available?
Positive
25-ft or 50-ft
Pull a vacuum
Subtract ambient temperature from 100

7. At what temperature does refrigerant condense in a high-efficiency unit?
The takeoff fitting
20 degrees above ambient
Yes
A dirty evaporator

8. How many amps can 8 g wire handle?
Stranded
They are physically larger
40 A
Nitrogen with a small amount of refrigerant

9. What are the three crafts normally associated with an air-conditioned installation?
L-type
300
Any amount
Duct - electrical - and mechanical

10. How do you calculate LRA?
Inclined manometer
L-type
RLA/FLA x 5
To remove humidity and lower dry bulb temperature

11. How do you calculate ballpark superheat?
Over 800 degrees F
40 A
Subtract ambient temperature from 100
40 degrees F

12. 13 SEER is classified as what kind of efficiency?
Positive
In parallel
High
20 degrees F

13. How does ACR copper pipe come?
Dehydrated with caps on each end
400
100
Shorted winding - open winding - and grounded winding

14. When must a copper joint never be soldered or brazed?
Average feet per minute X area in square feet (H' x W'/144)
When the system is under pressure
A bypass duct or a dump zone
TXV

15. 8' round duct has a ballpark cfm of what?
False
200
In series
Static pressure - velocity pressure - and total pressure

16. The fan switch opens at what temperature?
Potential relay and start capacitor
105 degrees F
Duct - electrical - and mechanical
Btu/hr (output) / wattage (input)

17. The fan switch closes at what temperature?
Yes
140 degrees F
105 degrees F
Over 800 degrees F

18. What are the two types of blower drives?
With an are rating
Outside diameter (OD)
Belt drive and direct drive
40 degrees F

19. How do you calculate the area of a circle?
Pi x radius squared
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
With a minimum of three evenly spaced self-tapping screws
Inside diameter (ID)

20. What is the typical pressure differance across a TXV?
Nominal-sized tubing
It also rises
100 psig
Common

21. 10 SEER is classified as what kind of efficiency?
A dirty evaporator
Standard
2 minutes
300

22. What do you do after you braze a system?
Nominal-sized tubing
Shorted winding - open winding - and grounded winding
They are larger
Pull a vacuum

23. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Duct with insulation on the inside
300
True
It will be high

24. What is the name of the fitting where the branch line leaves the duct?
By increasing the surface of the condenser coil
Nominal-sized tubing
A bypass duct or a dump zone
The takeoff fitting

25. At what temperature does refrigerant condense in a standard-efficiency unit?
2
Belt drive and direct drive
30-35 degrees above ambient
Yes

26. What is the normal evaporator temperature?
Static pressure - velocity pressure - and total pressure
When it is above a conditioned space
Over 800 degrees F
45 degrees F

27. Where do you apply flux when soldering?
Outside of the male fitting
A diffuser
The takeoff fitting
Standard

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

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29. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
TXV
Inclined manometer
Negative

30. Do you need a trap on a push-through evaporator?
Staples and tape
A diffuser
No
Below 800 degrees F

31. How are round ducts supported?

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32. What are the two functions of the air-conditioning system?
Nominal-sized tubing
To remove humidity and lower dry bulb temperature
Yes
It also rises

33. 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
Static pressure - velocity pressure - and total pressure
Rise
400

34. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Duct - electrical - and mechanical
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
In series
2 minutes

35. What are the two basic duct connection configurations for package units supply and return air ducts?
45-55%
Over/under and side by side
400
140 degrees F

36. Why are some ACR tubing lines insulated?
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Shorted winding - open winding - and grounded winding
With an are rating

37. At what temperature will brazing melt?
Infiltration and ventilation
Boil the liquid refrigerant out ot the oil within the crankcase
Over 800 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

38. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
A bypass duct or a dump zone
Negative
Nominal-sized tubing

39. If the rpm's are 1750 - how many poles does the motor have?
4
By increasing the surface of the condenser coil
High
The takeoff fitting

40. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
20 A
Potential relay and start capacitor
Yes

41. What is the design boiling point for most evaporator coils in residential air conditioning?
Boil the liquid refrigerant out ot the oil within the crankcase
Shorted winding - open winding - and grounded winding
18 gauge
40 degrees F

42. Where do you check the amps on a motor?
On the common terminal
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
100 psig
Latent and sensible

43. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
They are larger
No
With an are rating

44. What are the three pressures created by moving air in ductwork?
Belt drive and direct drive
Subtract ambient temperature from 100
Static pressure - velocity pressure - and total pressure
True

45. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Before the vent
105 degrees F
It will have a decrease in superheat
Vapor

46. What do you use to connect square and rectangular ductboard together?
25-ft or 50-ft
S-clips and drives (cleats)
Yes
It will have a decrease in superheat

47. The evaporator is designed to remove what two types of heat?
When it is a pull-through evaporator
L-type
Latent and sensible
6

48. What distributes supply air to a room in a structure?
4
Inches of water column (in. WC)
A diffuser
Outside of the male fitting

49. How is insulation around a duct rated?
In series
Yes
With an are rating
Subtract ambient temperature from 100

50. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
To remove humidity and lower dry bulb temperature
They are physically larger
Yes
False