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 it called when liquid refrigerant gets into the compressor?
ACR (air-conditioning refrigeration) tubing
A piston type metering device
Slugging
Infiltration and ventilation

2. How does ACR copper pipe come?
Heat loss
Outside diameter (OD)
The suction line or the low-pressure side
Dehydrated with caps on each end

3. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
With a minimum of three evenly spaced self-tapping screws
A swaging tool
Individual return air systems and central return air systems

4. What kind of copper tubing is used for refrigeration or air-conditioning applications?
105 degrees F
ACR (air-conditioning refrigeration) tubing
45 degrees F
A swaging tool

5. If the rpm's are 3450 - how many poles does the motor have?
Indoor fan motor - outdoor fan motor - and the compressor
When it is above a conditioned space
2
150

6. Pressure in ductwork is measured In what?
ACR (air-conditioning refrigeration) tubing
Yes
Inches of water column (in. WC)
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

7. At what temperature will soft solder melt?
Inside diameter (ID)
18 gauge
Below 800 degrees F
Potential relay and start capacitor

8. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
30-35 degrees above ambient
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
A diffuser

9. How do you calculate the area of a circle?
Pi x radius squared
With 4' saddles
40 degrees F
20 degrees F

10. What distributes supply air to a room in a structure?
A diffuser
30-35 degrees above ambient
Yes
Heat loss

11. 8' round duct has a ballpark cfm of what?
Blended refrigerants
200
TXV
100 psig

12. Does a package unit come from the factory pre-charged?
Yes
18 gauge
A diffuser
ACR (air-conditioning refrigeration) tubing

13. What are normal conditions - as defined by the ARI.
It rises
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
400
They are larger

14. How many cfm per ton?
Nitrogen with a small amount of refrigerant
To lower the amount of pressure drop through the coil
Nominal-sized tubing
400

15. In what length rolls is soft copper tubing normally available?
TXV
25-ft or 50-ft
100
With 4' saddles

16. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
105 degrees F
Yes
20 degrees F
In series

17. A reciprocating compressor has what sort of moving parts?
Static pressure - velocity pressure - and total pressure
ACR (air-conditioning refrigeration) tubing
It will have a decrease in superheat
Pistons

18. What are the two types of blower drives?
It will have a decrease in superheat
When it is above a conditioned space
It will be high
Belt drive and direct drive

19. The A/C size is calculated by what?
False
A band 4 inches or more in width
30-35 degrees above ambient
Heat load

20. How many amps can 10 g wire handle?
18 gauge
30 A
Negative
A bypass duct or a dump zone

21. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
To remove humidity and lower dry bulb temperature
Staples and tape
Negative

22. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Boil the liquid refrigerant out ot the oil within the crankcase
A bypass duct or a dump zone
Heat loss
Outside diameter (OD)

23. If the rpm's are 3450 - how many poles does the motor have?
To remove humidity and lower dry bulb temperature
ACR (air-conditioning refrigeration) tubing
100
2

24. Do you need a vent on a push-through evaporator?
45-55%
Yes
Over 800 degrees F
12000

25. What are the components of a hard-start kit?
Potential relay and start capacitor
It will have a decrease in superheat
TXV
Fiberglass

26. At what temperature will soft solder melt?
S-clips and drives (cleats)
Below 800 degrees F
20 degrees F
SEER includes the energy used in the start-up and shut-down cycles

27. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
Yes
In series
18 gauge

28. What are the two types of package units?
Pistons
The takeoff fitting
Side-by-side and over-and-under
By increasing the surface of the condenser coil

29. In what state is the refrigerant in the compressor?
400
15% silphos
On the common terminal
Vapor

30. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
They are physically larger
It rises
Staples and tape

31. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
A bypass duct or a dump zone
It will be high
Fiberglass

32. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Dehydrated with caps on each end
Nominal-sized tubing
L-type
Common

33. Which is more efficient - a TXV or a fixed-orifice metering device?
30 degrees F
They are physically larger
TXV
When it is above a conditioned space

34. Do you need a trap on a pull-through evaporator?
2
Yes
A band 4 inches or more in width
With a minimum of three evenly spaced self-tapping screws

35. Does a package unit come from the factory pre-charged?
15% silphos
Outside of the male fitting
40 degrees F
Yes

36. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
TXV
Pi x radius squared
40 degrees F

37. How do you calculate ballpark superheat?
Shorted winding - open winding - and grounded winding
Subtract ambient temperature from 100
A diffuser
20 degrees above ambient

38. When do you install an auxillary drain pan?
Pistons
When it is above a conditioned space
To remove humidity and lower dry bulb temperature
100 psig

39. If the rpm's are 750 - how many poles does the motor have?
To lower the amount of pressure drop through the coil
8
When the system is under pressure
Outside diameter (OD)

40. How many amps can 14 g wire handle?
Pi x radius squared
Heat load
To remove humidity and lower dry bulb temperature
15 A

41. What are the three crafts normally associated with an air-conditioned installation?
Pistons
Nitrogen with a small amount of refrigerant
Duct - electrical - and mechanical
Yes

42. Do you need a trap on a push-through evaporator?
Average feet per minute X area in square feet (H' x W'/144)
Dehydrated with caps on each end
The suction line or the low-pressure side
No

43. Superheat should never be below how many degrees
8-12 degrees F
40 degrees F
RLA/FLA x 5
5 degrees

44. A reciprocating compressor has what sort of moving parts?
Pistons
30-35 degrees above ambient
By increasing the surface of the condenser coil
Infiltration and ventilation

45. In what state is the refrigerant in the compressor?
On the common terminal
100
Compressor
Vapor

46. The evaporator is designed to remove what two types of heat?
Yes
Heat load
Latent and sensible
Outside diameter (OD)

47. 13 SEER is classified as what kind of efficiency?
20 degrees F
When it is above a conditioned space
A band 4 inches or more in width
High

48. What is the normal evaporator temperature?
Pistons
45 degrees F
It will have a decrease in superheat
Outside of the male fitting

49. 13 SEER is classified as what kind of efficiency?
High
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
The suction line or the low-pressure side
Heat load

50. Where do you check the amps on a motor?
A dirty evaporator
By increasing the surface of the condenser coil
On the common terminal
300