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Residential Air Conditioning

Instructions:

Answer 50 questions in 15 minutes.
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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 kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
The takeoff fitting
1/4'
Fiberglass

2. The evaporator is designed to remove what two types of heat?
Positive
Infiltration and ventilation
Latent and sensible
200

3. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
A diffuser
It also rises
Inclined manometer
L-type

4. What type of air conditioning system must be charged using the superheat method?
SEER includes the energy used in the start-up and shut-down cycles
A piston type metering device
8
They are larger

5. Where is insulation used on copper tubing used for air-conditioning?
SEER includes the energy used in the start-up and shut-down cycles
The suction line or the low-pressure side
Staples and tape
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

6. What are the three ways a motor can fail electrically?
In parallel
Shorted winding - open winding - and grounded winding
2 minutes
Suction

7. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Negative
False
4

8. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Shorted winding - open winding - and grounded winding
The suction line or the low-pressure side
To lower the amount of pressure drop through the coil
Any amount

9. What sort of pressure will a pull-through evaporator have?
It also rises
Negative
It will be low
Belt drive and direct drive

10. What are the three major power-consuming devices on an air-conditioning system?
A band 4 inches or more in width
Fiberglass
A dirty evaporator
Indoor fan motor - outdoor fan motor - and the compressor

11. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
With an are rating
18 gauge
150

12. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Nitrogen with a small amount of refrigerant
Heat load
S-clips and drives (cleats)
ACR (air-conditioning refrigeration) tubing

13. What is used to measure static air pressure in ducts.
Vapor
A dirty evaporator
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Inclined manometer

14. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
40 degrees F
It rises
To lower the amount of pressure drop through the coil

15. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
20 degrees above ambient
140 degrees F

16. What are normal conditions - as defined by the ARI.
100 psig
High
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Staples and tape

17. Which is more efficient - a TXV or a fixed-orifice metering device?
12000
On the common terminal
Dehydrated with caps on each end
TXV

18. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
4
Potential relay and start capacitor
By increasing the surface of the condenser coil

19. How will too much refrigerant effect superheat?
Slugging
Vapor
It will be low
Subtract ambient temperature from 100

20. What is the difference between SEER and EER?
Inside diameter (ID)
8
SEER includes the energy used in the start-up and shut-down cycles
Heat load

21. At what temperature will brazing melt?
When it is above a conditioned space
Fiberglass
Over 800 degrees F
5 degrees

22. If pressure rises - what happens to the superheat?
20 degrees above ambient
It rises
12000
5 degrees

23. How many amps can 8 g wire handle?
100 psig
By increasing the surface of the condenser coil
12000
40 A

24. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
SEER includes the energy used in the start-up and shut-down cycles
1/4'
A bypass duct or a dump zone

25. How is insulation around a duct rated?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
With an are rating
8
RLA/FLA x 5

26. How do you calculate cfm?

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27. How many amps can 8 g wire handle?
40 A
1/4'
Vapor
2

28. If the rpm's are 3450 - how many poles does the motor have?
TXV
Pull a vacuum
2 minutes
2

29. 10 SEER is classified as what kind of efficiency?
Below 800 degrees F
30 A
Standard
To remove humidity and lower dry bulb temperature

30. 6' round duct has a ballpark cfm of what?
Indoor fan motor - outdoor fan motor - and the compressor
By increasing the surface of the condenser coil
To lower the amount of pressure drop through the coil
100

31. What sort of pressure will a push-through evaporator have?
Positive
45 degrees F
Any amount
Outside of the male fitting

32. Do you need a vent on a pull-through evaporator?
True
Yes
Pull a vacuum
Standard

33. How do you calculate ballpark superheat?
6
By increasing the surface of the condenser coil
Subtract ambient temperature from 100
A diffuser

34. How do you achieve high-efficiency?
Inches of water column (in. WC)
20 degrees F
With 4' saddles
By increasing the surface of the condenser coil

35. Superheat should never be below how many degrees
5 degrees
15% silphos
By increasing the surface of the condenser coil
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

36. What sort of pressure will a push-through evaporator have?
Boil the liquid refrigerant out ot the oil within the crankcase
5 degrees
Outside of the male fitting
Positive

37. Sections of duct board can be fastened together with what?
8-12 degrees F
Staples and tape
RLA/FLA x 5
To lower the amount of pressure drop through the coil

38. What distributes supply air to a room in a structure?
A diffuser
30 degrees F
20 A
When the system is under pressure

39. What are the four materials used to make duct?
No
A diffuser
Individual return air systems and central return air systems
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

40. In what length rolls is soft copper tubing normally available?
When it is above a conditioned space
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
25-ft or 50-ft

41. How do you calculate EER?
4
25-ft or 50-ft
Heat loss
Btu/hr (output) / wattage (input)

42. What are the three crafts normally associated with an air-conditioned installation?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Duct - electrical - and mechanical
It also rises
Rise

43. At what temperature does refrigerant condense in a high-efficiency unit?
A band 4 inches or more in width
Yes
SEER includes the energy used in the start-up and shut-down cycles
20 degrees above ambient

44. What do you use to check for leaks?
Yes
Nitrogen with a small amount of refrigerant
100 psig
Over/under and side by side

45. Which type of wire can handle a higher ampacity?
Infiltration and ventilation
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Stranded
It will be high

46. How do you achieve high-efficiency?
Static pressure - velocity pressure - and total pressure
40 degrees F
40 A
By increasing the surface of the condenser coil

47. What gauge is thermostat wire?
Heat loss
When it is a pull-through evaporator
A swaging tool
18 gauge

48. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
30 degrees F
2
30 A

49. What component changes refrigerant from a low pressure gas to a high pressure gas?
15 A
With 4' saddles
Standard
Compressor

50. If the rpm's are 1750 - how many poles does the motor have?
30-35 degrees above ambient
4
No
Yes