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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. The fan switch closes at what temperature?
It will be low
140 degrees F
By increasing the surface of the condenser coil
Rise

2. At what temperature does refrigerant condense in a standard-efficiency unit?
Inside diameter (ID)
When it is a pull-through evaporator
30-35 degrees above ambient
2 minutes

3. What is it called when liquid refrigerant gets into the compressor?
140 degrees F
Slugging
5 degrees
It will be low

4. How are round ducts supported?

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5. Where do you check the amps on a motor?
2 minutes
On the common terminal
Outside diameter (OD)
The takeoff fitting

6. 10' round duct has a ballpark cfm of what?
40 A
400
4
L-type

7. How many amps can 10 g wire handle?
Inside diameter (ID)
30 A
Shorted winding - open winding - and grounded winding
Inside diameter (ID)

8. In what length rolls is soft copper tubing normally available?
Shorted winding - open winding - and grounded winding
25-ft or 50-ft
Fiberglass
300

9. 8' round duct has a ballpark cfm of what?
200
Dehydrated with caps on each end
Inches of water column (in. WC)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

10. What is the normal evaporator temperature?
45 degrees F
Over 800 degrees F
Staples and tape
Over 800 degrees F

11. 10 SEER is classified as what kind of efficiency?
200
When it is a pull-through evaporator
Standard
15 A

12. If the rpm's are 3450 - how many poles does the motor have?
2
20 degrees above ambient
20 degrees above ambient
Heat load

13. How many amps can 12 g wire handle?
100
It rises
20 A
Blended refrigerants

14. If the rpm's are 750 - how many poles does the motor have?
1/4'
1/4'
8
Before the vent

15. Pressure in ductwork is measured In what?
S-clips and drives (cleats)
15 A
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Inches of water column (in. WC)

16. At what temperature will brazing melt?
Over 800 degrees F
Latent and sensible
Yes
105 degrees F

17. At what temperature will brazing melt?
15 A
Over 800 degrees F
Stranded
ACR (air-conditioning refrigeration) tubing

18. What is the typical pressure differance across a TXV?
Individual return air systems and central return air systems
To remove humidity and lower dry bulb temperature
100 psig
Over 800 degrees F

19. The fan switch closes at what temperature?
Standard
Yes
140 degrees F
L-type

20. Do you need a trap on a push-through evaporator?
100
Standard
200
No

21. How many amps can 12 g wire handle?
20 A
1/4'
To remove humidity and lower dry bulb temperature
A bypass duct or a dump zone

22. When do you install an auxillary drain pan?
Pull a vacuum
Rise
When it is above a conditioned space
Common

23. What are the two basic duct connection configurations for package units supply and return air ducts?
No
100
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Over/under and side by side

24. The crankcase heater on an air-conditioning compressor is used to what?
When it is a pull-through evaporator
6
A dirty evaporator
Boil the liquid refrigerant out ot the oil within the crankcase

25. On what terminal do you check amperage?
A band 4 inches or more in width
Common
2 minutes
Duct - electrical - and mechanical

26. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes
30 degrees F

27. Where do you check the amps on a motor?
30 A
With an are rating
On the common terminal
Rise

28. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
On the common terminal
In series
12000
18 gauge

29. What is used to measure static air pressure in ducts.
Inclined manometer
TXV
TXV
Pull a vacuum

30. How many amps can 10 g wire handle?
Yes
Compressor
30 A
No

31. How many amps can 14 g wire handle?
It also rises
When it is a pull-through evaporator
Shorted winding - open winding - and grounded winding
15 A

32. What is the difference between SEER and EER?
It rises
SEER includes the energy used in the start-up and shut-down cycles
They are physically larger
High

33. The load on the evaporater will effect which pressure?
400
Suction
On the common terminal
It will have a decrease in superheat

34. What is a package unit?
Yes
Belt drive and direct drive
To remove humidity and lower dry bulb temperature
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

35. How will too much refrigerant effect subcooling?
It will be high
TXV
In series
Positive

36. How are the condenser coils different on a high-efficiency unit?
They are larger
Yes
Outside of the male fitting
2

37. The A/C size is calculated by what?
Heat load
30 A
On the common terminal
A dirty evaporator

38. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
Dehydrated with caps on each end
They are physically larger
Average feet per minute X area in square feet (H' x W'/144)

39. How are round ducts connected to one another?
Indoor fan motor - outdoor fan motor - and the compressor
When it is above a conditioned space
With a minimum of three evenly spaced self-tapping screws
Compressor

40. At what temperature will soft solder melt?
300
Below 800 degrees F
Heat load
A dirty evaporator

41. If the rpm's are 1050 - how many poles does the motor have?
6
Heat loss
Compressor
15 A

42. How do you calculate EER?
200
Btu/hr (output) / wattage (input)
When it is a pull-through evaporator
Over/under and side by side

43. How does ACR copper pipe come?
Dehydrated with caps on each end
False
45 degrees F
25-ft or 50-ft

44. The load on the evaporater will effect which pressure?
1/4'
L-type
2 minutes
Suction

45. What is lined duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
6
Duct with insulation on the inside
A dirty evaporator

46. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
A dirty evaporator
Any amount
TXV
Duct with insulation on the inside

47. Where do you apply flux when soldering?
Outside of the male fitting
Inside diameter (ID)
Staples and tape
It rises

48. Do you need a vent on a push-through evaporator?
Static pressure - velocity pressure - and total pressure
A diffuser
Yes
Belt drive and direct drive

49. Where is insulation used on copper tubing used for air-conditioning?
A bypass duct or a dump zone
Indoor fan motor - outdoor fan motor - and the compressor
Over 800 degrees F
The suction line or the low-pressure side

50. What are the two ways that fresh air enters a structure?
Slugging
Infiltration and ventilation
Over/under and side by side
Pistons