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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 long should you leave a system off once you kill power before restarting it?
Belt drive and direct drive
Inside diameter (ID)
2 minutes
Nominal-sized tubing

2. How many amps can 14 g wire handle?
15 A
A swaging tool
TXV
8

3. How is insulation around a duct rated?
Duct - electrical - and mechanical
It will be low
By increasing the surface of the condenser coil
With an are rating

4. What is the difference between SEER and EER?
2
SEER includes the energy used in the start-up and shut-down cycles
Average feet per minute X area in square feet (H' x W'/144)
They are physically larger

5. Pressure in ductwork is measured In what?
Side-by-side and over-and-under
Inches of water column (in. WC)
30-35 degrees above ambient
300

6. What are the two types of blower drives?
Suction
Belt drive and direct drive
20 degrees F
Over/under and side by side

7. Which type of wire can handle a higher ampacity?
Stranded
8
It rises
40 degrees F

8. What kind of refrigeratnts must be added in liquid form?
6
200
Blended refrigerants
False

9. How are the condenser coils different on a high-efficiency unit?
40 degrees F
Side-by-side and over-and-under
They are larger
8

10. Where do you apply flux when soldering?
Indoor fan motor - outdoor fan motor - and the compressor
Inches of water column (in. WC)
Outside of the male fitting
Shorted winding - open winding - and grounded winding

11. 10 SEER is classified as what kind of efficiency?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Standard
A bypass duct or a dump zone
Yes

12. The compressor is cooled by liquid refrigerant. (True of False)
Average feet per minute X area in square feet (H' x W'/144)
Yes
False
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

13. How is insulation around a duct rated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Nominal-sized tubing
With an are rating
S-clips and drives (cleats)

14. If the rpm's are 1750 - how many poles does the motor have?
Compressor
4
When it is a pull-through evaporator
Inches of water column (in. WC)

15. What is a package unit?
Staples and tape
20 A
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Yes

16. What is the range for normal superheat and subcooling?
Stranded
8-12 degrees F
20 degrees F
30 degrees F

17. When do you install an auxillary drain pan?
Belt drive and direct drive
20 degrees F
8-12 degrees F
When it is above a conditioned space

18. How do you calculate ballpark superheat?
Before the vent
A diffuser
Subtract ambient temperature from 100
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

19. How many cfm per ton?
A piston type metering device
With 4' saddles
False
400

20. How will too much refrigerant effect subcooling?
12000
Belt drive and direct drive
150
It will be high

21. A reciprocating compressor has what sort of moving parts?
Side-by-side and over-and-under
With an are rating
Btu/hr (output) / wattage (input)
Pistons

22. What is used to measure static air pressure in ducts.
In series
Inclined manometer
6
15% silphos

23. What are the components of a hard-start kit?
Inclined manometer
Indoor fan motor - outdoor fan motor - and the compressor
Potential relay and start capacitor
15% silphos

24. How are round ducts connected to one another?
On the common terminal
S-clips and drives (cleats)
45-55%
With a minimum of three evenly spaced self-tapping screws

25. 7' round duct has a ballpark cfm of what?
20 degrees F
On the common terminal
150
400

26. 10' round duct has a ballpark cfm of what?
2
4
400
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

27. The furnace size is calculated by what?
When it is a pull-through evaporator
Average feet per minute X area in square feet (H' x W'/144)
Heat loss
It will be high

28. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
Heat loss
A band 4 inches or more in width
Heat load

29. How do you calculate EER?
Btu/hr (output) / wattage (input)
4
Any amount
Yes

30. How are the condenser coils different on a high-efficiency unit?
Positive
Rise
They are larger
15 A

31. If the rpm's are 1750 - how many poles does the motor have?
4
Yes
When it is a pull-through evaporator
Heat load

32. Where do you install a trap on a drain line?
Before the vent
Yes
100
Latent and sensible

33. Most duct insulation is made of what?
With 4' saddles
400
Fiberglass
Yes

34. If the rpm's are 750 - how many poles does the motor have?
When it is above a conditioned space
They are physically larger
8
Indoor fan motor - outdoor fan motor - and the compressor

35. Can refrigerant line sets be altered in length?
Yes
1/4'
It will have a decrease in superheat
Duct - electrical - and mechanical

36. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
5 degrees
Btu/hr (output) / wattage (input)
Below 800 degrees F

37. How do you calculate EER?
Btu/hr (output) / wattage (input)
To lower the amount of pressure drop through the coil
Individual return air systems and central return air systems
Over/under and side by side

38. What kind of metering device do high-efficiency units usually use?
Standard
TXV
No
With a minimum of three evenly spaced self-tapping screws

39. How is ACR tubing sized?
A band 4 inches or more in width
2 minutes
Outside diameter (OD)
Over 800 degrees F

40. If the rpm's are 750 - how many poles does the motor have?
With a minimum of three evenly spaced self-tapping screws
8
By increasing the surface of the condenser coil
200

41. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Yes
In series
In parallel
Btu/hr (output) / wattage (input)

42. What is the normal evaporator temperature?
Yes
40 degrees F
A dirty evaporator
45 degrees F

43. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
The takeoff fitting
25-ft or 50-ft
4

44. How many amps can 14 g wire handle?
Heat loss
15 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Infiltration and ventilation

45. 8' round duct has a ballpark cfm of what?
200
1/4'
2
Blended refrigerants

46. Does a package unit come from the factory pre-charged?
S-clips and drives (cleats)
Yes
5 degrees
To remove humidity and lower dry bulb temperature

47. How is nominal-sized tubing sized?
Inside diameter (ID)
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Positive
4

48. At what temperature does refrigerant condense in a high-efficiency unit?
L-type
Individual return air systems and central return air systems
Dehydrated with caps on each end
20 degrees above ambient

49. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Rise
With 4' saddles
ACR (air-conditioning refrigeration) tubing
Positive

50. How do you calculate cfm?

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