Test your basic knowledge |

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. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
2 minutes
Below 800 degrees F
Stranded

2. The crankcase heater on an air-conditioning compressor is used to what?
Pull a vacuum
4
Boil the liquid refrigerant out ot the oil within the crankcase
Rise

3. How is the high pressure switch wired with the low pressure switch?
It will have a decrease in superheat
6
2
In parallel

4. What can cause a decrease in suction pressure on an air-conditioning system?
TXV
400
Inside diameter (ID)
A dirty evaporator

5. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
40 degrees F
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

6. Do you need a trap on a push-through evaporator?
Dehydrated with caps on each end
Before the vent
No
Common

7. How are round ducts supported?

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8. What are the four materials used to make duct?
Heat load
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
It also rises
The takeoff fitting

9. What are the two types of package units?
40 degrees F
12000
Side-by-side and over-and-under
Infiltration and ventilation

10. What is the difference between SEER and EER?
They are physically larger
SEER includes the energy used in the start-up and shut-down cycles
Suction
25-ft or 50-ft

11. What gauge is thermostat wire?
45-55%
Duct with insulation on the inside
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
18 gauge

12. How is ACR tubing sized?
Outside diameter (OD)
Yes
Heat load
Before the vent

13. What is the range for normal superheat and subcooling?
8-12 degrees F
Any amount
Nominal-sized tubing
Duct - electrical - and mechanical

14. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
A diffuser
Standard
It will be low

15. What kind of copper tubing is used for refrigeration or air-conditioning applications?
In parallel
TXV
Yes
ACR (air-conditioning refrigeration) tubing

16. How many BTU's per ton?
12000
Standard
A dirty evaporator
100

17. In what length rolls is soft copper tubing normally available?
With an are rating
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
25-ft or 50-ft
20 degrees F

18. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Fiberglass
Average feet per minute X area in square feet (H' x W'/144)
40 degrees F
It rises

19. When must a copper joint never be soldered or brazed?
It will have a decrease in superheat
4
Slugging
When the system is under pressure

20. How will too much refrigerant effect subcooling?
When the system is under pressure
It will be high
True
Yes

21. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
140 degrees F
S-clips and drives (cleats)
False

22. In what length rolls is soft copper tubing normally available?
400
100 psig
6
25-ft or 50-ft

23. The evaporator is designed to remove what two types of heat?
Below 800 degrees F
Yes
30 A
Latent and sensible

24. What are the two basic duct connection configurations for package units supply and return air ducts?
Nitrogen with a small amount of refrigerant
Over/under and side by side
Duct - electrical - and mechanical
They are larger

25. Where do you install a trap on a drain line?
ACR (air-conditioning refrigeration) tubing
It will be high
Before the vent
TXV

26. What are the two types of blower drives?
Pi x radius squared
Belt drive and direct drive
15 A
With an are rating

27. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Btu/hr (output) / wattage (input)
2
Yes
In series

28. How do you calculate the area of a circle?
Pi x radius squared
It also rises
4
It rises

29. If the rpm's are 3450 - how many poles does the motor have?
45 degrees F
2
The takeoff fitting
Static pressure - velocity pressure - and total pressure

30. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
A swaging tool
On the common terminal
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

31. What is used to measure static air pressure in ducts.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Inclined manometer
Pi x radius squared
20 A

32. How many cfm per ton?
Fiberglass
Pull a vacuum
False
400

33. 8' round duct has a ballpark cfm of what?
18 gauge
Belt drive and direct drive
200
140 degrees F

34. Do you need a vent on a push-through evaporator?
Btu/hr (output) / wattage (input)
6
Yes
In series

35. How do you calculate EER?
Staples and tape
5 degrees
Standard
Btu/hr (output) / wattage (input)

36. What is a package unit?
In series
When it is a pull-through evaporator
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

37. How is nominal-sized tubing sized?
25-ft or 50-ft
150
Inside diameter (ID)
TXV

38. 10' round duct has a ballpark cfm of what?
Inside diameter (ID)
Staples and tape
40 A
400

39. How is insulation around a duct rated?
400
Compressor
With an are rating
It rises

40. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
Yes
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Subtract ambient temperature from 100

41. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
Over/under and side by side
Heat loss
18 gauge

42. When do you install a trap on a drain line?
Pistons
With 4' saddles
When it is a pull-through evaporator
Outside of the male fitting

43. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
ACR (air-conditioning refrigeration) tubing
Inside diameter (ID)
20 degrees F
The suction line or the low-pressure side

44. What do you do after you braze a system?
Pull a vacuum
When it is a pull-through evaporator
45 degrees F
Yes

45. If pressure rises - what happens to the superheat?
With an are rating
Latent and sensible
True
It rises

46. What is the normal evaporator temperature?
Rise
In series
12000
45 degrees F

47. The fan switch closes at what temperature?
The suction line or the low-pressure side
140 degrees F
5 degrees
Fiberglass

48. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Heat load
L-type
Over/under and side by side
Vapor

49. What sort of pressure will a pull-through evaporator have?
2
Inside diameter (ID)
Negative
Pull a vacuum

50. Does a package unit come from the factory pre-charged?
Fiberglass
Yes
Potential relay and start capacitor
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.