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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. If the rpm's are 3450 - how many poles does the motor have?
Yes
2
It will have a decrease in superheat
Negative

2. How is flexible duct supported?
A band 4 inches or more in width
Latent and sensible
105 degrees F
140 degrees F

3. How many cfm per ton?
8-12 degrees F
15% silphos
TXV
400

4. What is lined duct?
Over 800 degrees F
With a minimum of three evenly spaced self-tapping screws
Duct with insulation on the inside
Inches of water column (in. WC)

5. 6' round duct has a ballpark cfm of what?
8-12 degrees F
30-35 degrees above ambient
Heat load
100

6. If the suction pressure rises - what happens to the head pressure?
20 degrees above ambient
True
It also rises
Compressor

7. What is used to measure static air pressure in ducts.
15% silphos
Inclined manometer
Standard
Below 800 degrees F

8. How long should you leave a system off once you kill power before restarting it?
Yes
A diffuser
2 minutes
Nominal-sized tubing

9. The compressor is cooled by liquid refrigerant. (True of False)
Common
False
In parallel
On the common terminal

10. What sort of pressure will a push-through evaporator have?
Positive
High
Nitrogen with a small amount of refrigerant
140 degrees F

11. What are the two types of package units?
Yes
Yes
Side-by-side and over-and-under
A band 4 inches or more in width

12. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
140 degrees F
20 degrees F
True
A piston type metering device

13. What do you use to connect square and rectangular ductboard together?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Vapor
S-clips and drives (cleats)

14. What is it called when liquid refrigerant gets into the compressor?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When it is a pull-through evaporator
Slugging
It will be low

15. How will too much refrigerant effect subcooling?
Heat loss
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
It will be high
To lower the amount of pressure drop through the coil

16. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Pistons
Negative
Infiltration and ventilation

17. How are the condenser coils different on a high-efficiency unit?
Yes
Static pressure - velocity pressure - and total pressure
It will be low
They are larger

18. What are the three major power-consuming devices on an air-conditioning system?
8-12 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
Individual return air systems and central return air systems
Static pressure - velocity pressure - and total pressure

19. 13 SEER is classified as what kind of efficiency?
Yes
High
RLA/FLA x 5
RLA/FLA x 5

20. What percentage silver do you need to use for an are-410 system?
Duct with insulation on the inside
Latent and sensible
15% silphos
The suction line or the low-pressure side

21. If the rpm's are 1750 - how many poles does the motor have?
4
2 minutes
300
20 A

22. How is the high pressure switch wired with the low pressure switch?
100
Outside of the male fitting
Staples and tape
In parallel

23. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Fiberglass
A swaging tool
Any amount
It also rises

24. How does ACR copper pipe come?
Potential relay and start capacitor
Dehydrated with caps on each end
8
No

25. How does ACR copper pipe come?
30 A
Dehydrated with caps on each end
15% silphos
200

26. How many amps can 12 g wire handle?
20 A
False
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
RLA/FLA x 5

27. What are the two functions of the air-conditioning system?
Belt drive and direct drive
To remove humidity and lower dry bulb temperature
Yes
It will be low

28. If the rpm's are 1750 - how many poles does the motor have?
4
A diffuser
30 A
It rises

29. How is insulation around a duct rated?
With an are rating
By increasing the surface of the condenser coil
Before the vent
18 gauge

30. What gauge is thermostat wire?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
18 gauge
140 degrees F
High

31. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
A diffuser
40 degrees F
Slugging
Shorted winding - open winding - and grounded winding

32. The crankcase heater on an air-conditioning compressor is used to what?
A bypass duct or a dump zone
Boil the liquid refrigerant out ot the oil within the crankcase
When it is a pull-through evaporator
2 minutes

33. How do you calculate ballpark superheat?
6
Subtract ambient temperature from 100
By increasing the surface of the condenser coil
The suction line or the low-pressure side

34. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Compressor
No
A bypass duct or a dump zone
Staples and tape

35. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
When it is above a conditioned space
A bypass duct or a dump zone
Belt drive and direct drive

36. 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
It will be low
In parallel
Yes

37. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Subtract ambient temperature from 100
With a minimum of three evenly spaced self-tapping screws
Yes
45-55%

38. What is the difference between SEER and EER?
45-55%
Dehydrated with caps on each end
A swaging tool
SEER includes the energy used in the start-up and shut-down cycles

39. On what terminal do you check amperage?
45-55%
Common
To remove humidity and lower dry bulb temperature
Positive

40. 8' round duct has a ballpark cfm of what?
18 gauge
150
With 4' saddles
200

41. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Heat load
140 degrees F
Inclined manometer

42. A reciprocating compressor has what sort of moving parts?
Pistons
It rises
L-type
30-35 degrees above ambient

43. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
It will be low
TXV
Pull a vacuum

44. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
On the common terminal
Outside of the male fitting
SEER includes the energy used in the start-up and shut-down cycles

45. 9' round duct has a ballpark cfm of what?
300
By increasing the surface of the condenser coil
15% silphos
Standard

46. What is the design boiling point for most evaporator coils in residential air conditioning?
A bypass duct or a dump zone
Compressor
40 degrees F
Outside of the male fitting

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

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48. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
Yes
Yes
A dirty evaporator

49. Which type of wire can handle a higher ampacity?
Suction
Pull a vacuum
Stranded
25-ft or 50-ft

50. How do you calculate EER?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Btu/hr (output) / wattage (input)
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
High