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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. How many BTU's per ton?
12000
140 degrees F
When the system is under pressure
Pi x radius squared

2. The furnace size is calculated by what?
RLA/FLA x 5
Heat loss
Common
5 degrees

3. Where do you apply flux when soldering?
300
40 A
Pi x radius squared
Outside of the male fitting

4. How is nominal-sized tubing sized?
S-clips and drives (cleats)
Btu/hr (output) / wattage (input)
Inside diameter (ID)
30 A

5. How many amps can 12 g wire handle?
Positive
Pistons
20 A
Yes

6. Which is more efficient - a TXV or a fixed-orifice metering device?
Vapor
TXV
A band 4 inches or more in width
In parallel

7. Does a package unit come from the factory pre-charged?
Individual return air systems and central return air systems
Yes
105 degrees F
40 A

8. What sort of pressure will a pull-through evaporator have?
150
False
Negative
A diffuser

9. How many amps can 10 g wire handle?
30-35 degrees above ambient
30 A
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

10. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
TXV
Rise
The takeoff fitting

11. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
When it is a pull-through evaporator
TXV
They are physically larger
6

12. What gauge is thermostat wire?
18 gauge
Any amount
It also rises
They are larger

13. A reciprocating compressor has what sort of moving parts?
Pistons
Inside diameter (ID)
Duct with insulation on the inside
18 gauge

14. What is the range for normal superheat and subcooling?
8-12 degrees F
Common
Side-by-side and over-and-under
Staples and tape

15. What are the two types of blower drives?
Belt drive and direct drive
6
140 degrees F
A dirty evaporator

16. What is used to measure static air pressure in ducts.
100 psig
Inclined manometer
The suction line or the low-pressure side
Yes

17. Do you need a trap on a pull-through evaporator?
Yes
A diffuser
It will be low
40 A

18. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Belt drive and direct drive
Shorted winding - open winding - and grounded winding
L-type
They are physically larger

19. What distributes supply air to a room in a structure?
Standard
A diffuser
Yes
20 A

20. What is the name of the fitting where the branch line leaves the duct?
ACR (air-conditioning refrigeration) tubing
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
105 degrees F
The takeoff fitting

21. How are round ducts supported?

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22. Most duct insulation is made of what?
When it is above a conditioned space
It also rises
Fiberglass
300

23. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Inclined manometer
They are physically larger
100 psig
The takeoff fitting

24. What percentage silver do you need to use for an are-410 system?
Yes
15% silphos
With a minimum of three evenly spaced self-tapping screws
To remove humidity and lower dry bulb temperature

25. Do you need a vent on a push-through evaporator?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
1/4'
Yes
Nitrogen with a small amount of refrigerant

26. If the rpm's are 1050 - how many poles does the motor have?
150
6
15% silphos
400

27. Do you need a vent on a pull-through evaporator?
40 degrees F
Standard
A diffuser
Yes

28. 8' round duct has a ballpark cfm of what?
Rise
200
Static pressure - velocity pressure - and total pressure
A diffuser

29. Which is more efficient - a TXV or a fixed-orifice metering device?
Nitrogen with a small amount of refrigerant
Nominal-sized tubing
Compressor
TXV

30. How many amps can 8 g wire handle?
40 A
Inside diameter (ID)
It will be low
Pistons

31. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
30 degrees F
Positive

32. If the rpm's are 1050 - how many poles does the motor have?
45 degrees F
18 gauge
6
Shorted winding - open winding - and grounded winding

33. How do you calculate ballpark superheat?
Outside diameter (OD)
140 degrees F
Subtract ambient temperature from 100
High

34. If the suction pressure rises - what happens to the head pressure?
400
Over 800 degrees F
It also rises
Shorted winding - open winding - and grounded winding

35. 13 SEER is classified as what kind of efficiency?
Duct with insulation on the inside
140 degrees F
High
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

36. What kind of copper tubing is used for plumbing and heating applications?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Nominal-sized tubing
With 4' saddles
It also rises

37. If pressure rises - what happens to the superheat?
It rises
45-55%
No
20 degrees above ambient

38. If the rpm's are 750 - how many poles does the motor have?
5 degrees
8
Shorted winding - open winding - and grounded winding
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

39. What distributes supply air to a room in a structure?
The takeoff fitting
1/4'
Blended refrigerants
A diffuser

40. When do you install an auxillary drain pan?
True
When it is above a conditioned space
20 A
Yes

41. On what terminal do you check amperage?
100
Common
Suction
A dirty evaporator

42. If the rpm's are 1750 - how many poles does the motor have?
40 A
Yes
SEER includes the energy used in the start-up and shut-down cycles
4

43. What is lined duct?
Duct with insulation on the inside
TXV
Latent and sensible
When it is a pull-through evaporator

44. What are the two types of blower drives?
Compressor
20 degrees above ambient
Belt drive and direct drive
Any amount

45. The load on the evaporater will effect which pressure?
L-type
Suction
Blended refrigerants
To remove humidity and lower dry bulb temperature

46. The fan switch closes at what temperature?
Positive
It will have a decrease in superheat
140 degrees F
Average feet per minute X area in square feet (H' x W'/144)

47. How are the condenser coils different on a high-efficiency unit?
Btu/hr (output) / wattage (input)
Yes
They are larger
18 gauge

48. Can refrigerant line sets be altered in length?
It also rises
Yes
30 degrees F
30 A

49. Where do you check the amps on a motor?
On the common terminal
ACR (air-conditioning refrigeration) tubing
Duct - electrical - and mechanical
To lower the amount of pressure drop through the coil

50. How is nominal-sized tubing sized?
Inside diameter (ID)
Side-by-side and over-and-under
To remove humidity and lower dry bulb temperature
40 degrees F