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.
Pistons
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
200
Average feet per minute X area in square feet (H' x W'/144)

2. What are the three crafts normally associated with an air-conditioned installation?
15 A
Duct - electrical - and mechanical
To remove humidity and lower dry bulb temperature
No

3. How many amps can 8 g wire handle?
True
40 A
SEER includes the energy used in the start-up and shut-down cycles
400

4. Do you need a vent on a push-through evaporator?
When it is above a conditioned space
Yes
Blended refrigerants
On the common terminal

5. What can cause a decrease in suction pressure on an air-conditioning system?
Duct with insulation on the inside
When the system is under pressure
105 degrees F
A dirty evaporator

6. Pressure in ductwork is measured In what?
Latent and sensible
25-ft or 50-ft
Vapor
Inches of water column (in. WC)

7. What kind of copper tubing is used for refrigeration or air-conditioning applications?
105 degrees F
It also rises
Duct with insulation on the inside
ACR (air-conditioning refrigeration) tubing

8. When must a copper joint never be soldered or brazed?
ACR (air-conditioning refrigeration) tubing
18 gauge
High
When the system is under pressure

9. What is the typical pressure differance across a TXV?
Vapor
100 psig
RLA/FLA x 5
8-12 degrees F

10. How is insulation around a duct rated?
Fiberglass
400
Staples and tape
With an are rating

11. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Dehydrated with caps on each end
With an are rating
300
ACR (air-conditioning refrigeration) tubing

12. Does a package unit come from the factory pre-charged?
Potential relay and start capacitor
1/4'
Yes
Heat load

13. What is the design boiling point for most evaporator coils in residential air conditioning?
300
40 degrees F
With 4' saddles
45-55%

14. What is used to measure static air pressure in ducts.
Boil the liquid refrigerant out ot the oil within the crankcase
Inclined manometer
Slugging
By increasing the surface of the condenser coil

15. What are the components of a hard-start kit?
Staples and tape
30-35 degrees above ambient
Belt drive and direct drive
Potential relay and start capacitor

16. If the rpm's are 3450 - how many poles does the motor have?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
S-clips and drives (cleats)
2
Heat loss

17. Where do you apply flux when soldering?
30 A
Any amount
Duct - electrical - and mechanical
Outside of the male fitting

18. A reciprocating compressor has what sort of moving parts?
Pistons
400
Belt drive and direct drive
Indoor fan motor - outdoor fan motor - and the compressor

19. What are the two types of blower drives?
They are physically larger
S-clips and drives (cleats)
Belt drive and direct drive
A swaging tool

20. How is nominal-sized tubing sized?
High
Common
Inside diameter (ID)
It will have a decrease in superheat

21. How is the high pressure switch wired with the low pressure switch?
300
A swaging tool
In parallel
25-ft or 50-ft

22. What percentage silver do you need to use for an are-410 system?
Yes
S-clips and drives (cleats)
Average feet per minute X area in square feet (H' x W'/144)
15% silphos

23. How long should you leave a system off once you kill power before restarting it?
Outside of the male fitting
2 minutes
S-clips and drives (cleats)
A piston type metering device

24. What kind of refrigeratnts must be added in liquid form?
A dirty evaporator
Fiberglass
8
Blended refrigerants

25. Do you need a trap on a push-through evaporator?
150
No
S-clips and drives (cleats)
Side-by-side and over-and-under

26. If the rpm's are 1750 - how many poles does the motor have?
40 degrees F
4
40 degrees F
ACR (air-conditioning refrigeration) tubing

27. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Inclined manometer
To lower the amount of pressure drop through the coil
ACR (air-conditioning refrigeration) tubing

28. What is the design boiling point for most evaporator coils in residential air conditioning?
45 degrees F
With 4' saddles
L-type
40 degrees F

29. Sections of duct board can be fastened together with what?
Staples and tape
With an are rating
Yes
20 A

30. What are the components of a hard-start kit?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws
Over/under and side by side
Potential relay and start capacitor

31. How is flexible duct supported?
Inclined manometer
A band 4 inches or more in width
30-35 degrees above ambient
Standard

32. 8' round duct has a ballpark cfm of what?
Average feet per minute X area in square feet (H' x W'/144)
Boil the liquid refrigerant out ot the oil within the crankcase
200
Individual return air systems and central return air systems

33. What percentage silver do you need to use for an are-410 system?
Stranded
Yes
They are larger
15% silphos

34. What are the two types of return air systems in residential installations?
False
With an are rating
Individual return air systems and central return air systems
Outside diameter (OD)

35. How many BTU's per ton?
15% silphos
It rises
12000
With 4' saddles

36. How is insulation around a duct rated?
Nominal-sized tubing
A piston type metering device
45-55%
With an are rating

37. What is a package unit?
Latent and sensible
SEER includes the energy used in the start-up and shut-down cycles
45 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

38. What sort of pressure will a pull-through evaporator have?
Negative
30 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Average feet per minute X area in square feet (H' x W'/144)

39. 10 SEER is classified as what kind of efficiency?
Slugging
False
2 minutes
Standard

40. What is lined duct?
Duct with insulation on the inside
Potential relay and start capacitor
Inclined manometer
100

41. What is it called when liquid refrigerant gets into the compressor?
Slugging
Compressor
Shorted winding - open winding - and grounded winding
Pull a vacuum

42. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Any amount
Pistons
45-55%
Inside diameter (ID)

43. What is the range for normal superheat and subcooling?
8-12 degrees F
RLA/FLA x 5
Common
Latent and sensible

44. 10' round duct has a ballpark cfm of what?
Duct with insulation on the inside
400
30 A
Suction

45. How many amps can 14 g wire handle?
Rise
To lower the amount of pressure drop through the coil
Potential relay and start capacitor
15 A

46. How many amps can 14 g wire handle?
40 degrees F
20 A
15 A
Inches of water column (in. WC)

47. What is the name of the fitting where the branch line leaves the duct?
15 A
400
A swaging tool
The takeoff fitting

48. What are the three major power-consuming devices on an air-conditioning system?
Vapor
Stranded
They are physically larger
Indoor fan motor - outdoor fan motor - and the compressor

49. What type of air conditioning system must be charged using the superheat method?
Vapor
Belt drive and direct drive
Duct with insulation on the inside
A piston type metering device

50. Most duct insulation is made of what?
5 degrees
Fiberglass
Side-by-side and over-and-under
45-55%