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 distributes supply air to a room in a structure?
Inches of water column (in. WC)
Yes
2
A diffuser

2. The fan switch opens at what temperature?
Staples and tape
Below 800 degrees F
105 degrees F
100 psig

3. On what terminal do you check amperage?
Common
True
They are larger
A dirty evaporator

4. What are the four materials used to make duct?
A swaging tool
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Duct - electrical - and mechanical
2

5. What is a package unit?
Slugging
Infiltration and ventilation
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
40 A

6. How will too much refrigerant effect superheat?
It will be low
When it is above a conditioned space
Inclined manometer
It will have a decrease in superheat

7. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Fiberglass
A bypass duct or a dump zone
Outside of the male fitting
Vapor

8. What are the four materials used to make duct?
With a minimum of three evenly spaced self-tapping screws
It rises
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
They are larger

9. Most duct insulation is made of what?
Fiberglass
TXV
Yes
A band 4 inches or more in width

10. How will too much refrigerant effect subcooling?
It will be high
Rise
A piston type metering device
When the system is under pressure

11. How is insulation around a duct rated?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
100 psig
With an are rating
Vapor

12. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
Blended refrigerants
Outside diameter (OD)
25-ft or 50-ft

13. How is the high pressure switch wired with the low pressure switch?
Potential relay and start capacitor
In parallel
L-type
Btu/hr (output) / wattage (input)

14. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
Heat load
Over 800 degrees F
Duct with insulation on the inside

15. What are the two types of package units?
TXV
By increasing the surface of the condenser coil
Side-by-side and over-and-under
Shorted winding - open winding - and grounded winding

16. How are round ducts supported?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

17. How will too much refrigerant effect subcooling?
Over/under and side by side
Infiltration and ventilation
It will be high
True

18. What do you do after you braze a system?
Pull a vacuum
L-type
They are larger
Suction

19. Where do you install a trap on a drain line?
30-35 degrees above ambient
Blended refrigerants
100 psig
Before the vent

20. When do you install an auxillary drain pan?
Heat loss
TXV
Slugging
When it is above a conditioned space

21. How is ACR tubing sized?
Outside diameter (OD)
40 degrees F
2
The suction line or the low-pressure side

22. How do you calculate the area of a circle?
Yes
Pi x radius squared
Belt drive and direct drive
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

23. What tool is used to expand the diameter of soft copper tubing
A swaging tool
The takeoff fitting
With a minimum of three evenly spaced self-tapping screws
Potential relay and start capacitor

24. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
15% silphos
The takeoff fitting
Over/under and side by side

25. How do you calculate LRA?
20 degrees above ambient
RLA/FLA x 5
40 degrees F
Pull a vacuum

26. Will a dirty condenser cause a rise or fall in pressure?
30-35 degrees above ambient
Rise
45-55%
Nitrogen with a small amount of refrigerant

27. Sections of duct board can be fastened together with what?
Any amount
8-12 degrees F
Staples and tape
Inclined manometer

28. What type of air conditioning system must be charged using the superheat method?
A swaging tool
15% silphos
Fiberglass
A piston type metering device

29. What tool is used to expand the diameter of soft copper tubing
20 A
A swaging tool
105 degrees F
8

30. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Shorted winding - open winding - and grounded winding
It will have a decrease in superheat
In series
Nominal-sized tubing

31. If the rpm's are 1750 - how many poles does the motor have?
4
RLA/FLA x 5
8
False

32. Does a package unit come from the factory pre-charged?
Yes
They are physically larger
They are larger
Btu/hr (output) / wattage (input)

33. What are the two basic duct connection configurations for package units supply and return air ducts?
100
Over/under and side by side
Pistons
Heat loss

34. How does ACR copper pipe come?
Dehydrated with caps on each end
400
Infiltration and ventilation
Rise

35. How will too much refrigerant effect superheat?
Below 800 degrees F
It will be high
Suction
It will be low

36. The load on the evaporater will effect which pressure?
8-12 degrees F
Heat load
Suction
Over/under and side by side

37. If the rpm's are 3450 - how many poles does the motor have?
TXV
25-ft or 50-ft
2
Belt drive and direct drive

38. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
300
8-12 degrees F
45-55%

39. What are the two functions of the air-conditioning system?
Duct - electrical - and mechanical
400
To remove humidity and lower dry bulb temperature
When it is above a conditioned space

40. What sort of pressure will a pull-through evaporator have?
Negative
When it is a pull-through evaporator
Blended refrigerants
They are physically larger

41. What is the typical pressure differance across a TXV?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Yes
When it is a pull-through evaporator
100 psig

42. The fan switch opens at what temperature?
Common
Any amount
105 degrees F
Average feet per minute X area in square feet (H' x W'/144)

43. If the rpm's are 750 - how many poles does the motor have?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When it is above a conditioned space
With 4' saddles
8

44. How many amps can 12 g wire handle?
20 A
Outside of the male fitting
150
2 minutes

45. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
30-35 degrees above ambient
45 degrees F
Individual return air systems and central return air systems
L-type

46. 7' round duct has a ballpark cfm of what?
Common
Nitrogen with a small amount of refrigerant
150
Duct - electrical - and mechanical

47. 6' round duct has a ballpark cfm of what?
100
12000
Heat loss
Duct - electrical - and mechanical

48. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
Suction
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
SEER includes the energy used in the start-up and shut-down cycles

49. How is flexible duct supported?
In series
A band 4 inches or more in width
Suction
RLA/FLA x 5

50. What are the two functions of the air-conditioning system?
Pistons
Side-by-side and over-and-under
To remove humidity and lower dry bulb temperature
L-type