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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 furnace size is calculated by what?
Heat loss
A diffuser
Fiberglass
20 degrees above ambient

2. What is the normal evaporator temperature?
45 degrees F
5 degrees
On the common terminal
40 degrees F

3. Can refrigerant line sets be altered in length?
Over/under and side by side
Yes
Potential relay and start capacitor
It rises

4. How many amps can 14 g wire handle?
Duct with insulation on the inside
Inside diameter (ID)
On the common terminal
15 A

5. The load on the evaporater will effect which pressure?
2 minutes
Suction
With a minimum of three evenly spaced self-tapping screws
Inclined manometer

6. How do you calculate cfm?

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7. What is used to measure static air pressure in ducts.
Inclined manometer
30 A
Pi x radius squared
SEER includes the energy used in the start-up and shut-down cycles

8. When do you install a trap on a drain line?
2
200
Infiltration and ventilation
When it is a pull-through evaporator

9. How many amps can 8 g wire handle?
High
40 A
Staples and tape
With 4' saddles

10. Pressure in ductwork is measured In what?
TXV
Inches of water column (in. WC)
They are larger
When the system is under pressure

11. What are the two types of blower drives?
Any amount
Belt drive and direct drive
Heat loss
25-ft or 50-ft

12. What is lined duct?
15 A
Duct with insulation on the inside
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Before the vent

13. Where do you install a trap on a drain line?
40 A
Before the vent
False
Pistons

14. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
30 degrees F
Nitrogen with a small amount of refrigerant
Shorted winding - open winding - and grounded winding

15. How many amps can 12 g wire handle?
Below 800 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
20 A
6

16. At what temperature does refrigerant condense in a standard-efficiency unit?
Inches of water column (in. WC)
18 gauge
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
30-35 degrees above ambient

17. Which type of wire can handle a higher ampacity?
Over/under and side by side
Outside of the male fitting
Stranded
Rise

18. How do you calculate ballpark superheat?
ACR (air-conditioning refrigeration) tubing
Side-by-side and over-and-under
Subtract ambient temperature from 100
Pistons

19. Where do you apply flux when soldering?
Shorted winding - open winding - and grounded winding
Btu/hr (output) / wattage (input)
Outside of the male fitting
40 A

20. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Before the vent
Any amount
Average feet per minute X area in square feet (H' x W'/144)
150

21. What can cause a decrease in suction pressure on an air-conditioning system?
Subtract ambient temperature from 100
Negative
Outside diameter (OD)
A dirty evaporator

22. The evaporator is designed to remove what two types of heat?
Latent and sensible
A band 4 inches or more in width
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Standard

23. At what temperature will soft solder melt?
When the system is under pressure
Infiltration and ventilation
Inches of water column (in. WC)
Below 800 degrees F

24. The A/C size is calculated by what?
Heat load
Compressor
20 degrees F
25-ft or 50-ft

25. What gauge is thermostat wire?
True
Suction
With an are rating
18 gauge

26. What component changes refrigerant from a low pressure gas to a high pressure gas?
18 gauge
Compressor
Subtract ambient temperature from 100
20 degrees above ambient

27. If the rpm's are 1750 - how many poles does the motor have?
To lower the amount of pressure drop through the coil
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
4
Outside diameter (OD)

28. What type of air conditioning system must be charged using the superheat method?
Yes
Individual return air systems and central return air systems
A piston type metering device
The takeoff fitting

29. The A/C size is calculated by what?
It will be high
Pistons
Over 800 degrees F
Heat load

30. If pressure rises - what happens to the superheat?
A swaging tool
Standard
A band 4 inches or more in width
It rises

31. If the rpm's are 3450 - how many poles does the motor have?
2
Before the vent
Stranded
200

32. What distributes supply air to a room in a structure?
In series
30-35 degrees above ambient
A diffuser
Negative

33. 10 SEER is classified as what kind of efficiency?
Individual return air systems and central return air systems
Pistons
TXV
Standard

34. What is the normal evaporator temperature?
45 degrees F
Below 800 degrees F
Shorted winding - open winding - and grounded winding
400

35. How will too much refrigerant effect superheat?
105 degrees F
30 degrees F
45-55%
It will be low

36. How many cfm per ton?
It also rises
400
Yes
25-ft or 50-ft

37. What kind of refrigeratnts must be added in liquid form?
8-12 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
Duct - electrical - and mechanical
Blended refrigerants

38. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
No
To remove humidity and lower dry bulb temperature
Latent and sensible

39. What kind of refrigeratnts must be added in liquid form?
On the common terminal
200
Blended refrigerants
Heat load

40. Do you need a vent on a push-through evaporator?
RLA/FLA x 5
Yes
Side-by-side and over-and-under
140 degrees F

41. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
400
TXV
8-12 degrees F

42. 10 SEER is classified as what kind of efficiency?
A dirty evaporator
Standard
40 degrees F
Suction

43. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
12000
In series
A diffuser
30 A

44. If pressure rises - what happens to the superheat?
2 minutes
45 degrees F
Negative
It rises

45. Superheat should never be below how many degrees
5 degrees
Slugging
40 A
Positive

46. What is a package unit?
A bypass duct or a dump zone
Nominal-sized tubing
By increasing the surface of the condenser coil
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

47. Most duct insulation is made of what?
20 degrees above ambient
Fiberglass
To remove humidity and lower dry bulb temperature
Duct with insulation on the inside

48. How will too much refrigerant effect subcooling?
It will be high
Outside of the male fitting
Yes
Positive

49. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Pull a vacuum
A bypass duct or a dump zone
Rise
L-type

50. How long should you leave a system off once you kill power before restarting it?
2 minutes
8-12 degrees F
20 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.