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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 is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It rises
Over/under and side by side
12000

2. What kind of metering device do high-efficiency units usually use?
Inclined manometer
TXV
30 degrees F
ACR (air-conditioning refrigeration) tubing

3. 10' round duct has a ballpark cfm of what?
Shorted winding - open winding - and grounded winding
Boil the liquid refrigerant out ot the oil within the crankcase
400
40 A

4. How will too much refrigerant effect subcooling?
TXV
It will be high
Belt drive and direct drive
Indoor fan motor - outdoor fan motor - and the compressor

5. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
L-type
False
40 degrees F
They are larger

6. What is the typical pressure differance across a TXV?
100 psig
Pistons
Indoor fan motor - outdoor fan motor - and the compressor
Positive

7. What is a package unit?
L-type
False
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
2

8. What gauge is thermostat wire?
18 gauge
Heat loss
Side-by-side and over-and-under
Average feet per minute X area in square feet (H' x W'/144)

9. What are the two functions of the air-conditioning system?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Individual return air systems and central return air systems
False
To remove humidity and lower dry bulb temperature

10. What are the four materials used to make duct?
Any amount
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
False
2

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

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12. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
Yes
20 degrees above ambient
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

13. What sort of pressure will a push-through evaporator have?
Indoor fan motor - outdoor fan motor - and the compressor
15% silphos
Infiltration and ventilation
Positive

14. How do you calculate ballpark superheat?
The suction line or the low-pressure side
Latent and sensible
In series
Subtract ambient temperature from 100

15. Can refrigerant line sets be altered in length?
Yes
12000
Vapor
High

16. Do you need a trap on a push-through evaporator?
8
Outside diameter (OD)
300
No

17. What are the two basic duct connection configurations for package units supply and return air ducts?
Negative
Over/under and side by side
Average feet per minute X area in square feet (H' x W'/144)
A bypass duct or a dump zone

18. Do you need a vent on a pull-through evaporator?
Standard
Inclined manometer
Yes
L-type

19. What are the two types of blower drives?
Belt drive and direct drive
45 degrees F
A band 4 inches or more in width
20 A

20. If the rpm's are 1050 - how many poles does the motor have?
Nominal-sized tubing
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
6
Infiltration and ventilation

21. At what temperature does refrigerant condense in a standard-efficiency unit?
Yes
TXV
400
30-35 degrees above ambient

22. How is the high pressure switch wired with the low pressure switch?
With a minimum of three evenly spaced self-tapping screws
In parallel
140 degrees F
12000

23. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
High
Yes
Potential relay and start capacitor
It will have a decrease in superheat

24. What tool is used to expand the diameter of soft copper tubing
Below 800 degrees F
A swaging tool
The takeoff fitting
40 degrees F

25. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
Pull a vacuum
5 degrees
400

26. How does ACR copper pipe come?
Dehydrated with caps on each end
False
150
Shorted winding - open winding - and grounded winding

27. If pressure rises - what happens to the superheat?
Inches of water column (in. WC)
40 degrees F
20 degrees F
It rises

28. How is flexible duct supported?
Static pressure - velocity pressure - and total pressure
Yes
A band 4 inches or more in width
Indoor fan motor - outdoor fan motor - and the compressor

29. How will too much refrigerant effect superheat?
S-clips and drives (cleats)
30-35 degrees above ambient
Shorted winding - open winding - and grounded winding
It will be low

30. What do you do after you braze a system?
Individual return air systems and central return air systems
400
A band 4 inches or more in width
Pull a vacuum

31. The furnace size is calculated by what?
Average feet per minute X area in square feet (H' x W'/144)
Heat loss
6
They are larger

32. What sort of pressure will a pull-through evaporator have?
When it is above a conditioned space
Negative
4
300

33. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
4
Pi x radius squared
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

34. How long should you leave a system off once you kill power before restarting it?
2 minutes
Side-by-side and over-and-under
A swaging tool
A diffuser

35. How are round ducts connected to one another?
2 minutes
With a minimum of three evenly spaced self-tapping screws
12000
S-clips and drives (cleats)

36. How many amps can 8 g wire handle?
L-type
S-clips and drives (cleats)
40 A
20 degrees F

37. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Below 800 degrees F
It will have a decrease in superheat
It will be high
Stranded

38. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
Subtract ambient temperature from 100
40 A
Infiltration and ventilation

39. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
30 degrees F
Slugging
When it is above a conditioned space

40. A reciprocating compressor has what sort of moving parts?
Pistons
They are larger
Indoor fan motor - outdoor fan motor - and the compressor
No

41. At what temperature will soft solder melt?
Below 800 degrees F
Duct - electrical - and mechanical
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

42. How do you calculate the area of a circle?
When the system is under pressure
140 degrees F
Slugging
Pi x radius squared

43. How do you calculate LRA?
15% silphos
RLA/FLA x 5
Heat load
Slugging

44. 9' round duct has a ballpark cfm of what?
300
SEER includes the energy used in the start-up and shut-down cycles
20 degrees F
15% silphos

45. The compressor is cooled by liquid refrigerant. (True of False)
With 4' saddles
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
False
Heat load

46. How many cfm per ton?
400
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

47. Do you need a vent on a push-through evaporator?
Latent and sensible
20 A
Yes
A swaging tool

48. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
S-clips and drives (cleats)
By increasing the surface of the condenser coil
Compressor

49. At what temperature will soft solder melt?
Below 800 degrees F
Dehydrated with caps on each end
5 degrees
45 degrees F

50. 6' round duct has a ballpark cfm of what?
100
Over 800 degrees F
On the common terminal
No