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 kind of metering device do high-efficiency units usually use?
100 psig
Rise
Shorted winding - open winding - and grounded winding
TXV

2. If the rpm's are 750 - how many poles does the motor have?
It also rises
Yes
8
15% silphos

3. What are the two functions of the air-conditioning system?
Stranded
To remove humidity and lower dry bulb temperature
400
Negative

4. How do you achieve high-efficiency?
It will be high
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Side-by-side and over-and-under
By increasing the surface of the condenser coil

5. How many amps can 8 g wire handle?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A swaging tool
40 A
It will be high

6. How will too much refrigerant effect superheat?
40 degrees F
Staples and tape
It will be low
S-clips and drives (cleats)

7. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
Standard
Heat load
Subtract ambient temperature from 100

8. If pressure rises - what happens to the superheat?
Inches of water column (in. WC)
In parallel
Belt drive and direct drive
It rises

9. When do you install a trap on a drain line?
With an are rating
400
When it is a pull-through evaporator
Staples and tape

10. In what state is the refrigerant in the compressor?
8
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It will be low
Vapor

11. How are round ducts connected to one another?
20 degrees above ambient
With a minimum of three evenly spaced self-tapping screws
Any amount
L-type

12. What are normal conditions - as defined by the ARI.
1/4'
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Btu/hr (output) / wattage (input)
Staples and tape

13. What is lined duct?
It will be high
Duct with insulation on the inside
A band 4 inches or more in width
Outside diameter (OD)

14. Where is insulation used on copper tubing used for air-conditioning?
True
Stranded
The suction line or the low-pressure side
Rise

15. If the rpm's are 3450 - how many poles does the motor have?
2
S-clips and drives (cleats)
140 degrees F
Btu/hr (output) / wattage (input)

16. If the rpm's are 1750 - how many poles does the motor have?
Standard
40 degrees F
4
Blended refrigerants

17. What are the three ways a motor can fail electrically?
Average feet per minute X area in square feet (H' x W'/144)
100 psig
Shorted winding - open winding - and grounded winding
It will be low

18. How many amps can 14 g wire handle?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
15 A
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Average feet per minute X area in square feet (H' x W'/144)

19. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
25-ft or 50-ft
150
40 A

20. How many BTU's per ton?
30 A
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Compressor
12000

21. What type of air conditioning system must be charged using the superheat method?
45-55%
Boil the liquid refrigerant out ot the oil within the crankcase
A piston type metering device
20 degrees F

22. 8' round duct has a ballpark cfm of what?
It will have a decrease in superheat
Duct with insulation on the inside
Yes
200

23. Where do you check the amps on a motor?
False
Negative
On the common terminal
45-55%

24. Can refrigerant line sets be altered in length?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
20 A
Yes
It rises

25. Pressure in ductwork is measured In what?
S-clips and drives (cleats)
A dirty evaporator
6
Inches of water column (in. WC)

26. What distributes supply air to a room in a structure?
A diffuser
140 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
100 psig

27. How do you calculate ballpark superheat?
Over/under and side by side
Subtract ambient temperature from 100
40 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

28. Superheat should never be below how many degrees
The takeoff fitting
Btu/hr (output) / wattage (input)
Outside of the male fitting
5 degrees

29. When must a copper joint never be soldered or brazed?
When the system is under pressure
2
40 degrees F
Standard

30. If the rpm's are 750 - how many poles does the motor have?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Belt drive and direct drive
It will be high
8

31. How many amps can 10 g wire handle?
30 A
Duct with insulation on the inside
RLA/FLA x 5
Fiberglass

32. In what length rolls is soft copper tubing normally available?
Any amount
Rise
25-ft or 50-ft
100

33. At what temperature does refrigerant condense in a standard-efficiency unit?
Latent and sensible
Rise
30-35 degrees above ambient
By increasing the surface of the condenser coil

34. What do you use to check for leaks?
200
They are larger
A piston type metering device
Nitrogen with a small amount of refrigerant

35. 13 SEER is classified as what kind of efficiency?
High
Pistons
It will be low
Yes

36. If the rpm's are 3450 - how many poles does the motor have?
Positive
2
It will be high
Dehydrated with caps on each end

37. In what state is the refrigerant in the compressor?
Shorted winding - open winding - and grounded winding
Fiberglass
Vapor
45-55%

38. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Duct - electrical - and mechanical
2
A bypass duct or a dump zone
Yes

39. The load on the evaporater will effect which pressure?
Yes
Suction
Potential relay and start capacitor
Average feet per minute X area in square feet (H' x W'/144)

40. Most duct insulation is made of what?
When it is above a conditioned space
They are physically larger
Fiberglass
Average feet per minute X area in square feet (H' x W'/144)

41. How many amps can 12 g wire handle?
Stranded
20 degrees F
20 A
Yes

42. Where do you apply flux when soldering?
Rise
15% silphos
Outside of the male fitting
105 degrees F

43. A reciprocating compressor has what sort of moving parts?
Pistons
30-35 degrees above ambient
High
Btu/hr (output) / wattage (input)

44. What are the two basic duct connection configurations for package units supply and return air ducts?
Dehydrated with caps on each end
100
Over/under and side by side
12000

45. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
No
Average feet per minute X area in square feet (H' x W'/144)
To remove humidity and lower dry bulb temperature

46. Where is insulation used on copper tubing used for air-conditioning?
Positive
By increasing the surface of the condenser coil
140 degrees F
The suction line or the low-pressure side

47. What are the three crafts normally associated with an air-conditioned installation?
Boil the liquid refrigerant out ot the oil within the crankcase
1/4'
S-clips and drives (cleats)
Duct - electrical - and mechanical

48. Do you need a vent on a push-through evaporator?
300
40 degrees F
Yes
Side-by-side and over-and-under

49. What percentage silver do you need to use for an are-410 system?
L-type
30 A
15% silphos
With an are rating

50. What is a package unit?
The suction line or the low-pressure side
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
40 degrees F
Shorted winding - open winding - and grounded winding