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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 is nominal-sized tubing sized?
Subtract ambient temperature from 100
Positive
1/4'
Inside diameter (ID)

2. What is the range for normal superheat and subcooling?
8-12 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
It will be high
Belt drive and direct drive

3. What is the difference between SEER and EER?
A swaging tool
1/4'
SEER includes the energy used in the start-up and shut-down cycles
40 A

4. How will too much refrigerant effect subcooling?
Duct with insulation on the inside
2 minutes
Inclined manometer
It will be high

5. What are the two types of blower drives?
Belt drive and direct drive
A swaging tool
Heat loss
12000

6. In what length rolls is soft copper tubing normally available?
45-55%
Suction
25-ft or 50-ft
Compressor

7. How do you calculate the area of a circle?
8
400
Pi x radius squared
With 4' saddles

8. What is the normal evaporator temperature?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
45 degrees F
Inches of water column (in. WC)
Before the vent

9. How is insulation around a duct rated?
Vapor
With an are rating
L-type
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

10. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
Stranded
Individual return air systems and central return air systems
Inside diameter (ID)

11. 8' round duct has a ballpark cfm of what?
200
When the system is under pressure
Infiltration and ventilation
A diffuser

12. What type of air conditioning system must be charged using the superheat method?
It also rises
A piston type metering device
On the common terminal
40 A

13. What kind of copper tubing is used for plumbing and heating applications?
Yes
Common
Nominal-sized tubing
2 minutes

14. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
45-55%
Negative
Below 800 degrees F

15. Do you need a trap on a push-through evaporator?
Rise
100
15% silphos
No

16. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Any amount
In parallel
RLA/FLA x 5
40 degrees F

17. How many cfm per ton?
400
15 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
20 degrees above ambient

18. What are the two types of return air systems in residential installations?
With 4' saddles
Individual return air systems and central return air systems
Inside diameter (ID)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

19. What are the three crafts normally associated with an air-conditioned installation?
8
Duct - electrical - and mechanical
The suction line or the low-pressure side
A piston type metering device

20. When do you install a trap on a drain line?
Slugging
When it is a pull-through evaporator
2 minutes
Pi x radius squared

21. What is a package unit?
6
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
On the common terminal
Heat load

22. What is the typical pressure differance across a TXV?
Outside diameter (OD)
With a minimum of three evenly spaced self-tapping screws
400
100 psig

23. When do you install an auxillary drain pan?
Pistons
Average feet per minute X area in square feet (H' x W'/144)
With 4' saddles
When it is above a conditioned space

24. How do you calculate cfm?

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25. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
8-12 degrees F
With an are rating
Outside of the male fitting
To lower the amount of pressure drop through the coil

26. Do you need a trap on a pull-through evaporator?
It will be low
Yes
With an are rating
Infiltration and ventilation

27. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
TXV
In series
Latent and sensible

28. 13 SEER is classified as what kind of efficiency?
It rises
40 degrees F
High
Outside diameter (OD)

29. 9' round duct has a ballpark cfm of what?
Potential relay and start capacitor
300
Stranded
45 degrees F

30. 10' round duct has a ballpark cfm of what?
400
ACR (air-conditioning refrigeration) tubing
4
A swaging tool

31. If the suction pressure rises - what happens to the head pressure?
It also rises
Shorted winding - open winding - and grounded winding
Indoor fan motor - outdoor fan motor - and the compressor
Compressor

32. If the rpm's are 750 - how many poles does the motor have?
A bypass duct or a dump zone
SEER includes the energy used in the start-up and shut-down cycles
By increasing the surface of the condenser coil
8

33. How do you calculate EER?
Boil the liquid refrigerant out ot the oil within the crankcase
Over/under and side by side
Btu/hr (output) / wattage (input)
With a minimum of three evenly spaced self-tapping screws

34. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
100
A dirty evaporator
45-55%
It will be high

35. 7' round duct has a ballpark cfm of what?
300
When it is a pull-through evaporator
150
200

36. Where do you check the amps on a motor?
On the common terminal
Infiltration and ventilation
100 psig
Slugging

37. What is a package unit?
8
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Yes
No

38. How does ACR copper pipe come?
It also rises
140 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Dehydrated with caps on each end

39. What are the two functions of the air-conditioning system?
40 A
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
To remove humidity and lower dry bulb temperature
It will have a decrease in superheat

40. What is the name of the fitting where the branch line leaves the duct?
Stranded
Suction
The takeoff fitting
With a minimum of three evenly spaced self-tapping screws

41. At what temperature does refrigerant condense in a standard-efficiency unit?
No
30-35 degrees above ambient
40 A
With an are rating

42. 10 SEER is classified as what kind of efficiency?
Standard
105 degrees F
S-clips and drives (cleats)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

43. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
Inclined manometer
A swaging tool
RLA/FLA x 5

44. Do you need a trap on a pull-through evaporator?
Yes
40 degrees F
When it is above a conditioned space
105 degrees F

45. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
30 degrees F
400
True
Inches of water column (in. WC)

46. What are the four materials used to make duct?
Shorted winding - open winding - and grounded winding
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
It rises
2

47. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Below 800 degrees F
Rise
A band 4 inches or more in width
20 degrees F

48. The furnace size is calculated by what?
On the common terminal
Heat loss
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
5 degrees

49. What do you do after you braze a system?
Pull a vacuum
400
8-12 degrees F
TXV

50. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
High
A dirty evaporator
30 degrees F
200