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. What is the difference between SEER and EER?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
SEER includes the energy used in the start-up and shut-down cycles
With 4' saddles
When the system is under pressure

2. How do you calculate the area of a circle?
It also rises
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Pi x radius squared
It also rises

3. How will too much refrigerant effect subcooling?
It will be high
With 4' saddles
8-12 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

4. If the rpm's are 1750 - how many poles does the motor have?
4
On the common terminal
Inclined manometer
40 degrees F

5. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
They are larger
15 A
100 psig

6. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Shorted winding - open winding - and grounded winding
Suction
Subtract ambient temperature from 100
L-type

7. What is the difference between SEER and EER?
Pi x radius squared
Before the vent
SEER includes the energy used in the start-up and shut-down cycles
30-35 degrees above ambient

8. What is the typical pressure differance across a TXV?
Heat load
200
100 psig
On the common terminal

9. What sort of pressure will a pull-through evaporator have?
30-35 degrees above ambient
In series
Negative
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

10. What is the name of the fitting where the branch line leaves the duct?
L-type
Positive
The takeoff fitting
300

11. The furnace size is calculated by what?
A piston type metering device
A diffuser
Heat loss
S-clips and drives (cleats)

12. The compressor is cooled by liquid refrigerant. (True of False)
Fiberglass
High
5 degrees
False

13. Can refrigerant line sets be altered in length?
Yes
When the system is under pressure
Shorted winding - open winding - and grounded winding
2 minutes

14. Why are some ACR tubing lines insulated?
Boil the liquid refrigerant out ot the oil within the crankcase
30 A
TXV
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

15. What sort of pressure will a push-through evaporator have?
200
Positive
A swaging tool
45 degrees F

16. Will a dirty condenser cause a rise or fall in pressure?
RLA/FLA x 5
Rise
Latent and sensible
A diffuser

17. What kind of copper tubing is used for plumbing and heating applications?
105 degrees F
True
In parallel
Nominal-sized tubing

18. How are round ducts connected to one another?
Negative
30-35 degrees above ambient
Inclined manometer
With a minimum of three evenly spaced self-tapping screws

19. Where do you apply flux when soldering?
Static pressure - velocity pressure - and total pressure
Blended refrigerants
Outside of the male fitting
Inclined manometer

20. What is a package unit?
Side-by-side and over-and-under
2
Stranded
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

21. How does ACR copper pipe come?
By increasing the surface of the condenser coil
The suction line or the low-pressure side
Dehydrated with caps on each end
140 degrees F

22. Most duct insulation is made of what?
Belt drive and direct drive
Fiberglass
Inches of water column (in. WC)
A piston type metering device

23. How does ACR copper pipe come?
SEER includes the energy used in the start-up and shut-down cycles
20 degrees above ambient
30 A
Dehydrated with caps on each end

24. 10' round duct has a ballpark cfm of what?
A dirty evaporator
Over/under and side by side
400
When the system is under pressure

25. What is lined duct?
Duct with insulation on the inside
Over/under and side by side
400
Over 800 degrees F

26. How do you calculate LRA?
Below 800 degrees F
When it is above a conditioned space
RLA/FLA x 5
6

27. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
A bypass duct or a dump zone
Below 800 degrees F
True

28. If the rpm's are 750 - how many poles does the motor have?
8
A diffuser
When it is a pull-through evaporator
Before the vent

29. How is ACR tubing sized?
Outside diameter (OD)
Heat loss
Staples and tape
20 A

30. What is the typical pressure differance across a TXV?
Side-by-side and over-and-under
To lower the amount of pressure drop through the coil
It will be low
100 psig

31. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
L-type
They are larger
40 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

32. How is the high pressure switch wired with the low pressure switch?
20 degrees above ambient
In parallel
Duct - electrical - and mechanical
6

33. What are the three pressures created by moving air in ductwork?
15 A
Before the vent
Static pressure - velocity pressure - and total pressure
Compressor

34. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
The suction line or the low-pressure side
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Stranded

35. What are the four materials used to make duct?
Stranded
4
Duct - electrical - and mechanical
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

36. What are the three ways a motor can fail electrically?
Boil the liquid refrigerant out ot the oil within the crankcase
Shorted winding - open winding - and grounded winding
Staples and tape
When it is above a conditioned space

37. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
To remove humidity and lower dry bulb temperature
With an are rating
12000

38. What sort of pressure will a pull-through evaporator have?
The takeoff fitting
1/4'
Positive
Negative

39. If the rpm's are 750 - how many poles does the motor have?
It will be high
Static pressure - velocity pressure - and total pressure
8
25-ft or 50-ft

40. How is insulation around a duct rated?
With an are rating
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Belt drive and direct drive
Stranded

41. 9' round duct has a ballpark cfm of what?
Latent and sensible
The suction line or the low-pressure side
300
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

42. What do you do after you braze a system?
Pull a vacuum
With a minimum of three evenly spaced self-tapping screws
40 degrees F
Dehydrated with caps on each end

43. In what length rolls is soft copper tubing normally available?
SEER includes the energy used in the start-up and shut-down cycles
Rise
25-ft or 50-ft
Dehydrated with caps on each end

44. What tool is used to expand the diameter of soft copper tubing
Shorted winding - open winding - and grounded winding
A swaging tool
Yes
100

45. What type of air conditioning system must be charged using the superheat method?
Average feet per minute X area in square feet (H' x W'/144)
Heat loss
A piston type metering device
With an are rating

46. What is the normal evaporator temperature?
15% silphos
RLA/FLA x 5
45 degrees F
Negative

47. What is the range for normal superheat and subcooling?
100
Average feet per minute X area in square feet (H' x W'/144)
8-12 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

48. Do you need a vent on a push-through evaporator?
TXV
12000
Yes
Fiberglass

49. On what terminal do you check amperage?
Pi x radius squared
Common
Latent and sensible
On the common terminal

50. 10 SEER is classified as what kind of efficiency?
Outside diameter (OD)
Standard
It will have a decrease in superheat
8