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 are normal conditions - as defined by the ARI.
25-ft or 50-ft
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
8
Positive

2. What kind of copper tubing is used for refrigeration or air-conditioning applications?
The takeoff fitting
ACR (air-conditioning refrigeration) tubing
Static pressure - velocity pressure - and total pressure
Subtract ambient temperature from 100

3. What are the two types of blower drives?
Belt drive and direct drive
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
In parallel
It will be high

4. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
With 4' saddles
2
Belt drive and direct drive

5. Pressure in ductwork is measured In what?
Belt drive and direct drive
Inches of water column (in. WC)
Dehydrated with caps on each end
Duct - electrical - and mechanical

6. How are round ducts connected to one another?
Latent and sensible
In series
With a minimum of three evenly spaced self-tapping screws
25-ft or 50-ft

7. How many amps can 10 g wire handle?
2
30 A
When it is above a conditioned space
45-55%

8. What are normal conditions - as defined by the ARI.
Dehydrated with caps on each end
Side-by-side and over-and-under
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Over/under and side by side

9. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Outside of the male fitting
L-type
A piston type metering device
RLA/FLA x 5

10. What tool is used to expand the diameter of soft copper tubing
It will be low
Below 800 degrees F
In parallel
A swaging tool

11. Where do you apply flux when soldering?
It will be low
False
With 4' saddles
Outside of the male fitting

12. How many amps can 8 g wire handle?
150
L-type
40 A
Individual return air systems and central return air systems

13. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
Inches of water column (in. WC)
Belt drive and direct drive
Outside of the male fitting

14. How do you calculate cfm?

15. Why are some ACR tubing lines insulated?
The suction line or the low-pressure side
When the system is under pressure
Latent and sensible
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

16. Superheat should never be below how many degrees
5 degrees
Outside diameter (OD)
25-ft or 50-ft
When the system is under pressure

17. What is used to measure static air pressure in ducts.
It also rises
It will be high
300
Inclined manometer

18. What are the three pressures created by moving air in ductwork?
Yes
Static pressure - velocity pressure - and total pressure
A bypass duct or a dump zone
Individual return air systems and central return air systems

19. How many amps can 14 g wire handle?
SEER includes the energy used in the start-up and shut-down cycles
15 A
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Blended refrigerants

20. Do you need a vent on a pull-through evaporator?
Individual return air systems and central return air systems
Yes
Slugging
15% silphos

21. What percentage silver do you need to use for an are-410 system?
15% silphos
The takeoff fitting
20 A
Rise

22. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
40 degrees F
Slugging
150

23. Where is insulation used on copper tubing used for air-conditioning?
Below 800 degrees F
Suction
The suction line or the low-pressure side
Vapor

24. 13 SEER is classified as what kind of efficiency?
6
High
Individual return air systems and central return air systems
Yes

25. How do you calculate EER?
Pi x radius squared
TXV
Btu/hr (output) / wattage (input)
Slugging

26. What can cause a decrease in suction pressure on an air-conditioning system?
It will be low
A dirty evaporator
Suction
Slugging

27. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
A swaging tool
True
200
Rise

28. What do you use to check for leaks?
400
30 degrees F
Stranded
Nitrogen with a small amount of refrigerant

29. What kind of metering device do high-efficiency units usually use?
TXV
False
Inside diameter (ID)
Heat load

30. When must a copper joint never be soldered or brazed?
Yes
20 degrees above ambient
When the system is under pressure
False

31. The evaporator is designed to remove what two types of heat?
300
Static pressure - velocity pressure - and total pressure
Latent and sensible
Staples and tape

32. A reciprocating compressor has what sort of moving parts?
Pistons
Common
30-35 degrees above ambient
Side-by-side and over-and-under

33. If the rpm's are 1050 - how many poles does the motor have?
Boil the liquid refrigerant out ot the oil within the crankcase
6
Side-by-side and over-and-under
A swaging tool

34. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Latent and sensible
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Negative

35. How will too much refrigerant effect superheat?
Nitrogen with a small amount of refrigerant
Stranded
It will be low
Nominal-sized tubing

36. How will too much refrigerant effect subcooling?
It will be high
30 A
200
No

37. What are the two types of return air systems in residential installations?
Blended refrigerants
A swaging tool
Individual return air systems and central return air systems
Duct with insulation on the inside

38. How do you calculate the area of a circle?
Subtract ambient temperature from 100
When it is a pull-through evaporator
20 degrees F
Pi x radius squared

39. What is a package unit?
Belt drive and direct drive
L-type
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
With a minimum of three evenly spaced self-tapping screws

40. Does a package unit come from the factory pre-charged?
With a minimum of three evenly spaced self-tapping screws
The takeoff fitting
Yes
SEER includes the energy used in the start-up and shut-down cycles

41. What distributes supply air to a room in a structure?
A swaging tool
A diffuser
400
140 degrees F

42. What are the components of a hard-start kit?
Nitrogen with a small amount of refrigerant
8
Potential relay and start capacitor
The takeoff fitting

43. How much does a drain line need to drop per foot of length?

44. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
Below 800 degrees F
Average feet per minute X area in square feet (H' x W'/144)
With 4' saddles

45. Where do you check the amps on a motor?
Rise
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
2 minutes
On the common terminal

46. What are the two functions of the air-conditioning system?
Static pressure - velocity pressure - and total pressure
To remove humidity and lower dry bulb temperature
Below 800 degrees F
Pi x radius squared

47. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
A bypass duct or a dump zone
Individual return air systems and central return air systems
Inside diameter (ID)

48. How do you calculate cfm?

49. 10' round duct has a ballpark cfm of what?
400
Yes
In series
Over/under and side by side

50. At what temperature does refrigerant condense in a standard-efficiency unit?
20 degrees above ambient
Staples and tape
150
30-35 degrees above ambient