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. Do you need a vent on a push-through evaporator?
They are larger
Vapor
20 degrees F
Yes

2. How do you calculate LRA?
20 degrees F
Nitrogen with a small amount of refrigerant
In parallel
RLA/FLA x 5

3. If the rpm's are 750 - how many poles does the motor have?
15 A
Dehydrated with caps on each end
8
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

4. If the rpm's are 3450 - how many poles does the motor have?
ACR (air-conditioning refrigeration) tubing
2
By increasing the surface of the condenser coil
Rise

5. The furnace size is calculated by what?
Heat loss
Standard
Yes
Pull a vacuum

6. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Side-by-side and over-and-under
Belt drive and direct drive
Suction
It will have a decrease in superheat

7. When do you install an auxillary drain pan?
When it is above a conditioned space
True
12000
High

8. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
30 A
Potential relay and start capacitor
False

9. What are the components of a hard-start kit?
Boil the liquid refrigerant out ot the oil within the crankcase
Average feet per minute X area in square feet (H' x W'/144)
With 4' saddles
Potential relay and start capacitor

10. How do you calculate cfm?

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

11. The evaporator is designed to remove what two types of heat?
1/4'
140 degrees F
Subtract ambient temperature from 100
Latent and sensible

12. How is ACR tubing sized?
Yes
With 4' saddles
Outside diameter (OD)
S-clips and drives (cleats)

13. What kind of copper tubing is used for refrigeration or air-conditioning applications?
25-ft or 50-ft
30 A
A swaging tool
ACR (air-conditioning refrigeration) tubing

14. Do you need a trap on a pull-through evaporator?
It will be high
40 degrees F
Yes
100 psig

15. What is the design boiling point for most evaporator coils in residential air conditioning?
100 psig
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
40 degrees F
Nitrogen with a small amount of refrigerant

16. What do you do after you braze a system?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes
Pull a vacuum
200

17. Will a dirty condenser cause a rise or fall in pressure?
Rise
A swaging tool
15 A
300

18. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
45 degrees F
They are physically larger
Duct with insulation on the inside
30-35 degrees above ambient

19. How is insulation around a duct rated?
In parallel
Inclined manometer
Yes
With an are rating

20. What distributes supply air to a room in a structure?
Over 800 degrees F
18 gauge
With an are rating
A diffuser

21. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Over/under and side by side
They are physically larger
Average feet per minute X area in square feet (H' x W'/144)
Inside diameter (ID)

22. Where do you check the amps on a motor?
140 degrees F
On the common terminal
30 A
8-12 degrees F

23. How are the condenser coils different on a high-efficiency unit?
15 A
30 degrees F
They are larger
With an are rating

24. 10 SEER is classified as what kind of efficiency?
Over 800 degrees F
15% silphos
Positive
Standard

25. What kind of copper tubing is used for plumbing and heating applications?
SEER includes the energy used in the start-up and shut-down cycles
Common
8-12 degrees F
Nominal-sized tubing

26. What is the difference between SEER and EER?
Belt drive and direct drive
SEER includes the energy used in the start-up and shut-down cycles
In series
Slugging

27. What percentage silver do you need to use for an are-410 system?
Stranded
Standard
A piston type metering device
15% silphos

28. The evaporator is designed to remove what two types of heat?
Latent and sensible
Average feet per minute X area in square feet (H' x W'/144)
140 degrees F
When it is above a conditioned space

29. What kind of refrigeratnts must be added in liquid form?
Subtract ambient temperature from 100
Blended refrigerants
Positive
Negative

30. What sort of pressure will a push-through evaporator have?
Static pressure - velocity pressure - and total pressure
TXV
100 psig
Positive

31. What is the range for normal superheat and subcooling?
8-12 degrees F
True
Blended refrigerants
It will be low

32. What is the normal evaporator temperature?
Side-by-side and over-and-under
Dehydrated with caps on each end
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
45 degrees F

33. How do you calculate cfm?

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

34. What do you use to connect square and rectangular ductboard together?
It will be high
Staples and tape
Static pressure - velocity pressure - and total pressure
S-clips and drives (cleats)

35. The load on the evaporater will effect which pressure?
6
20 A
Suction
Average feet per minute X area in square feet (H' x W'/144)

36. What can cause a decrease in suction pressure on an air-conditioning system?
Inside diameter (ID)
A dirty evaporator
Over 800 degrees F
SEER includes the energy used in the start-up and shut-down cycles

37. What is it called when liquid refrigerant gets into the compressor?
12000
A bypass duct or a dump zone
Slugging
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

38. What are the components of a hard-start kit?
Potential relay and start capacitor
140 degrees F
It will be high
ACR (air-conditioning refrigeration) tubing

39. Does a package unit come from the factory pre-charged?
Before the vent
12000
Yes
The takeoff fitting

40. 8' round duct has a ballpark cfm of what?
A band 4 inches or more in width
Yes
200
Compressor

41. What tool is used to expand the diameter of soft copper tubing
Yes
400
A swaging tool
400

42. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
RLA/FLA x 5
A bypass duct or a dump zone
5 degrees
2

43. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
Over 800 degrees F
Heat load
A swaging tool

44. At what temperature does refrigerant condense in a high-efficiency unit?
A diffuser
Side-by-side and over-and-under
20 degrees above ambient
40 A

45. When must a copper joint never be soldered or brazed?
200
Infiltration and ventilation
200
When the system is under pressure

46. What sort of pressure will a pull-through evaporator have?
Negative
When it is above a conditioned space
When the system is under pressure
40 degrees F

47. Do you need a trap on a push-through evaporator?
Nitrogen with a small amount of refrigerant
No
Duct - electrical - and mechanical
100

48. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
TXV
5 degrees
4

49. Which type of wire can handle a higher ampacity?
Shorted winding - open winding - and grounded winding
RLA/FLA x 5
Stranded
Yes

50. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Slugging
Positive
40 degrees F
300