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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?
Slugging
Heat loss
Blended refrigerants
140 degrees F

2. What are the two types of package units?
400
Side-by-side and over-and-under
Yes
Rise

3. What are the two types of blower drives?
30-35 degrees above ambient
Belt drive and direct drive
Inclined manometer
Any amount

4. What are the three major power-consuming devices on an air-conditioning system?
They are physically larger
400
Indoor fan motor - outdoor fan motor - and the compressor
45-55%

5. What sort of pressure will a push-through evaporator have?
1/4'
Positive
Belt drive and direct drive
45 degrees F

6. How is the high pressure switch wired with the low pressure switch?
20 degrees F
With a minimum of three evenly spaced self-tapping screws
Infiltration and ventilation
In parallel

7. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Blended refrigerants
Rise
2

8. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
Over/under and side by side
SEER includes the energy used in the start-up and shut-down cycles
Positive

9. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
150
18 gauge
S-clips and drives (cleats)

10. What is the range for normal superheat and subcooling?
8-12 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
12000
Outside of the male fitting

11. How many amps can 12 g wire handle?
Yes
20 A
It will have a decrease in superheat
45-55%

12. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Duct with insulation on the inside
45-55%
When it is a pull-through evaporator
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

13. How is ACR tubing sized?
ACR (air-conditioning refrigeration) tubing
Btu/hr (output) / wattage (input)
It also rises
Outside diameter (OD)

14. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
With a minimum of three evenly spaced self-tapping screws
Latent and sensible
When it is a pull-through evaporator

15. What is a package unit?
Duct with insulation on the inside
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
It rises
Inside diameter (ID)

16. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
Any amount
Negative
Dehydrated with caps on each end

17. How do you achieve high-efficiency?
Standard
By increasing the surface of the condenser coil
A bypass duct or a dump zone
Side-by-side and over-and-under

18. How many cfm per ton?
Side-by-side and over-and-under
Duct - electrical - and mechanical
400
140 degrees F

19. What is considered normal operating conditions?
Yes
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
40 degrees F
The takeoff fitting

20. The evaporator is designed to remove what two types of heat?
Negative
140 degrees F
Latent and sensible
A swaging tool

21. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
They are larger
A bypass duct or a dump zone

22. The fan switch opens at what temperature?
Staples and tape
105 degrees F
Average feet per minute X area in square feet (H' x W'/144)
2

23. When do you install an auxillary drain pan?
40 degrees F
It will have a decrease in superheat
When it is above a conditioned space
Stranded

24. Pressure in ductwork is measured In what?
15 A
100
Inches of water column (in. WC)
40 degrees F

25. At what temperature will brazing melt?
Outside of the male fitting
Over 800 degrees F
Duct with insulation on the inside
18 gauge

26. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
In parallel
Standard
When it is a pull-through evaporator

27. In what state is the refrigerant in the compressor?
Vapor
15 A
TXV
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

28. Superheat should never be below how many degrees
It will have a decrease in superheat
The suction line or the low-pressure side
5 degrees
Over/under and side by side

29. The load on the evaporater will effect which pressure?
Pull a vacuum
Suction
Inclined manometer
Below 800 degrees F

30. At what temperature will brazing melt?
A bypass duct or a dump zone
Suction
Shorted winding - open winding - and grounded winding
Over 800 degrees F

31. Sections of duct board can be fastened together with what?
A band 4 inches or more in width
Staples and tape
Vapor
Negative

32. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
400
Yes
SEER includes the energy used in the start-up and shut-down cycles

33. How do you calculate cfm?

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34. What are the three pressures created by moving air in ductwork?
A swaging tool
Static pressure - velocity pressure - and total pressure
The suction line or the low-pressure side
Standard

35. If the suction pressure rises - what happens to the head pressure?
105 degrees F
25-ft or 50-ft
A bypass duct or a dump zone
It also rises

36. The fan switch closes at what temperature?
140 degrees F
Vapor
20 degrees above ambient
L-type

37. How will too much refrigerant effect superheat?
It will be low
It will be high
Suction
Common

38. How many amps can 10 g wire handle?
Nitrogen with a small amount of refrigerant
30 A
Side-by-side and over-and-under
On the common terminal

39. In what length rolls is soft copper tubing normally available?
Duct with insulation on the inside
150
In parallel
25-ft or 50-ft

40. The compressor is cooled by liquid refrigerant. (True of False)
It also rises
False
SEER includes the energy used in the start-up and shut-down cycles
Latent and sensible

41. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
2 minutes
No
4

42. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
A piston type metering device
Duct - electrical - and mechanical
40 A

43. What kind of metering device do high-efficiency units usually use?
25-ft or 50-ft
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
A diffuser
TXV

44. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
True
Over 800 degrees F
In series
Subtract ambient temperature from 100

45. What distributes supply air to a room in a structure?
140 degrees F
40 degrees F
A diffuser
When it is a pull-through evaporator

46. What gauge is thermostat wire?
18 gauge
20 A
They are larger
Common

47. In what state is the refrigerant in the compressor?
30-35 degrees above ambient
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Vapor
Positive

48. In what length rolls is soft copper tubing normally available?
It will be low
100 psig
25-ft or 50-ft
Fiberglass

49. What is it called when liquid refrigerant gets into the compressor?
Btu/hr (output) / wattage (input)
SEER includes the energy used in the start-up and shut-down cycles
Slugging
20 degrees above ambient

50. If the rpm's are 750 - how many poles does the motor have?
8
A dirty evaporator
Dehydrated with caps on each end
20 A