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. The load on the evaporater will effect which pressure?
Positive
Over/under and side by side
15% silphos
Suction

2. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Inches of water column (in. WC)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
40 degrees F
It will have a decrease in superheat

3. The fan switch opens at what temperature?
S-clips and drives (cleats)
105 degrees F
2
Individual return air systems and central return air systems

4. Will a dirty condenser cause a rise or fall in pressure?
105 degrees F
A band 4 inches or more in width
Before the vent
Rise

5. In what state is the refrigerant in the compressor?
In parallel
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Vapor
30 A

6. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It also rises
5 degrees
Vapor
It will have a decrease in superheat

7. What is the typical pressure differance across a TXV?
When it is above a conditioned space
100 psig
8-12 degrees F
Belt drive and direct drive

8. What is the normal evaporator temperature?
Yes
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
40 degrees F
45 degrees F

9. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
Common
Subtract ambient temperature from 100
They are larger

10. If the suction pressure rises - what happens to the head pressure?
45 degrees F
A diffuser
ACR (air-conditioning refrigeration) tubing
It also rises

11. 8' round duct has a ballpark cfm of what?
1/4'
It rises
200
The suction line or the low-pressure side

12. How does ACR copper pipe come?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
With a minimum of three evenly spaced self-tapping screws
Dehydrated with caps on each end

13. What kind of metering device do high-efficiency units usually use?
105 degrees F
A dirty evaporator
TXV
When it is a pull-through evaporator

14. If the suction pressure rises - what happens to the head pressure?
40 degrees F
Yes
It also rises
Outside diameter (OD)

15. When must a copper joint never be soldered or brazed?
Staples and tape
Before the vent
30-35 degrees above ambient
When the system is under pressure

16. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
40 A
Yes
Btu/hr (output) / wattage (input)

17. What do you use to check for leaks?
12000
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
By increasing the surface of the condenser coil
Nitrogen with a small amount of refrigerant

18. When do you install an auxillary drain pan?
Yes
Over/under and side by side
When it is above a conditioned space
100 psig

19. What is a package unit?
Negative
Below 800 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
40 degrees F

20. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Heat loss
L-type
Rise
Inclined manometer

21. What is lined duct?
Duct with insulation on the inside
30 degrees F
30 A
Static pressure - velocity pressure - and total pressure

22. If the rpm's are 750 - how many poles does the motor have?
Standard
Infiltration and ventilation
30 degrees F
8

23. Do you need a vent on a push-through evaporator?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
6
Blended refrigerants
Yes

24. How do you calculate EER?
140 degrees F
1/4'
Btu/hr (output) / wattage (input)
Nitrogen with a small amount of refrigerant

25. What are the two types of blower drives?
Belt drive and direct drive
200
A bypass duct or a dump zone
Infiltration and ventilation

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

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

27. If the rpm's are 1050 - how many poles does the motor have?
Inches of water column (in. WC)
TXV
6
Stranded

28. What are the two types of package units?
A swaging tool
Subtract ambient temperature from 100
Side-by-side and over-and-under
It will be high

29. If pressure rises - what happens to the superheat?
It rises
True
Below 800 degrees F
False

30. How is the high pressure switch wired with the low pressure switch?
Vapor
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A swaging tool
In parallel

31. How long should you leave a system off once you kill power before restarting it?
TXV
15 A
2 minutes
Staples and tape

32. The fan switch opens at what temperature?
They are physically larger
With a minimum of three evenly spaced self-tapping screws
105 degrees F
Positive

33. What is the name of the fitting where the branch line leaves the duct?
6
The takeoff fitting
40 degrees F
S-clips and drives (cleats)

34. How will too much refrigerant effect subcooling?
Staples and tape
Static pressure - velocity pressure - and total pressure
It will be high
Heat load

35. What type of air conditioning system must be charged using the superheat method?
Yes
A piston type metering device
The takeoff fitting
12000

36. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
Duct - electrical - and mechanical
Duct with insulation on the inside
Staples and tape

37. If the rpm's are 1750 - how many poles does the motor have?
4
When it is above a conditioned space
Suction
It also rises

38. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Nominal-sized tubing
20 degrees above ambient
True

39. What sort of pressure will a pull-through evaporator have?
40 A
25-ft or 50-ft
Negative
It will be high

40. What are the three pressures created by moving air in ductwork?
It will have a decrease in superheat
Any amount
6
Static pressure - velocity pressure - and total pressure

41. How is nominal-sized tubing sized?
In parallel
Inside diameter (ID)
Yes
In series

42. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Heat loss
ACR (air-conditioning refrigeration) tubing
No
Yes

43. What is used to measure static air pressure in ducts.
Yes
To lower the amount of pressure drop through the coil
20 A
Inclined manometer

44. What is the design boiling point for most evaporator coils in residential air conditioning?
Potential relay and start capacitor
40 degrees F
Positive
A band 4 inches or more in width

45. 10 SEER is classified as what kind of efficiency?
Pull a vacuum
Side-by-side and over-and-under
Standard
A bypass duct or a dump zone

46. Superheat should never be below how many degrees
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Duct - electrical - and mechanical
5 degrees
A swaging tool

47. How many amps can 10 g wire handle?
30 A
Static pressure - velocity pressure - and total pressure
Individual return air systems and central return air systems
Duct with insulation on the inside

48. How many amps can 14 g wire handle?
Pi x radius squared
It will be high
15 A
Individual return air systems and central return air systems

49. How is nominal-sized tubing sized?
Inside diameter (ID)
Yes
When the system is under pressure
Individual return air systems and central return air systems

50. What sort of pressure will a pull-through evaporator have?
Negative
It rises
30 degrees F
L-type