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 do you use to connect square and rectangular ductboard together?
Blended refrigerants
45-55%
False
S-clips and drives (cleats)

2. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Subtract ambient temperature from 100
A bypass duct or a dump zone
Suction
It will be high

3. How many cfm per ton?
400
Inside diameter (ID)
2 minutes
RLA/FLA x 5

4. When do you install a trap on a drain line?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
45 degrees F
Individual return air systems and central return air systems
When it is a pull-through evaporator

5. Where do you check the amps on a motor?
High
1/4'
20 degrees F
On the common terminal

6. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
Rise
It rises
In parallel

7. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
They are physically larger
To lower the amount of pressure drop through the coil
When it is a pull-through evaporator
30 A

8. How many amps can 10 g wire handle?
30 A
It will be low
By increasing the surface of the condenser coil
4

9. How do you calculate cfm?

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

10. How many amps can 8 g wire handle?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Compressor
Outside of the male fitting
40 A

11. How many amps can 12 g wire handle?
40 A
Outside diameter (OD)
Inclined manometer
20 A

12. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
15% silphos
Vapor
Over/under and side by side

13. The A/C size is calculated by what?
Below 800 degrees F
Heat load
40 degrees F
15% silphos

14. How do you calculate EER?
Btu/hr (output) / wattage (input)
On the common terminal
It rises
40 A

15. Most duct insulation is made of what?
Fiberglass
25-ft or 50-ft
100
200

16. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Average feet per minute X area in square feet (H' x W'/144)
Stranded
20 degrees F
40 degrees F

17. Superheat should never be below how many degrees
Blended refrigerants
Duct with insulation on the inside
Boil the liquid refrigerant out ot the oil within the crankcase
5 degrees

18. If the rpm's are 3450 - how many poles does the motor have?
300
Boil the liquid refrigerant out ot the oil within the crankcase
2
Inches of water column (in. WC)

19. What are the components of a hard-start kit?
4
Positive
Potential relay and start capacitor
When the system is under pressure

20. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
200
40 degrees F
Vapor

21. Where do you apply flux when soldering?
Compressor
Shorted winding - open winding - and grounded winding
Inside diameter (ID)
Outside of the male fitting

22. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
A piston type metering device
Potential relay and start capacitor
In series

23. Can refrigerant line sets be altered in length?
100
2 minutes
Yes
RLA/FLA x 5

24. 9' round duct has a ballpark cfm of what?
Yes
400
300
A band 4 inches or more in width

25. Which is more efficient - a TXV or a fixed-orifice metering device?
200
Heat loss
TXV
Outside diameter (OD)

26. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
45 degrees F
Infiltration and ventilation
It rises

27. The compressor is cooled by liquid refrigerant. (True of False)
False
RLA/FLA x 5
Stranded
Dehydrated with caps on each end

28. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It will have a decrease in superheat
The suction line or the low-pressure side
Positive

29. Where is insulation used on copper tubing used for air-conditioning?
With 4' saddles
Any amount
No
The suction line or the low-pressure side

30. 7' round duct has a ballpark cfm of what?
Pistons
150
S-clips and drives (cleats)
L-type

31. When must a copper joint never be soldered or brazed?
Heat loss
When the system is under pressure
Subtract ambient temperature from 100
The suction line or the low-pressure side

32. Will a dirty condenser cause a rise or fall in pressure?
Rise
A swaging tool
18 gauge
40 degrees F

33. How is insulation around a duct rated?
With an are rating
4
A diffuser
Outside diameter (OD)

34. When do you install an auxillary drain pan?
When it is above a conditioned space
40 degrees F
Common
Potential relay and start capacitor

35. How is nominal-sized tubing sized?
Standard
400
Inside diameter (ID)
TXV

36. What is considered normal operating conditions?
Pull a vacuum
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
A dirty evaporator
Positive

37. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
A bypass duct or a dump zone
Standard
They are physically larger

38. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
When it is above a conditioned space
20 A
Outside of the male fitting

39. What kind of metering device do high-efficiency units usually use?
Yes
Shorted winding - open winding - and grounded winding
TXV
6

40. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
Inclined manometer
300
Indoor fan motor - outdoor fan motor - and the compressor

41. How does ACR copper pipe come?
300
8-12 degrees F
They are larger
Dehydrated with caps on each end

42. How do you calculate ballpark superheat?
6
Subtract ambient temperature from 100
18 gauge
RLA/FLA x 5

43. The load on the evaporater will effect which pressure?
Before the vent
It also rises
6
Suction

44. If the suction pressure rises - what happens to the head pressure?
Individual return air systems and central return air systems
It also rises
It will have a decrease in superheat
Positive

45. Where do you install a trap on a drain line?
RLA/FLA x 5
Before the vent
True
8

46. What are the two functions of the air-conditioning system?
SEER includes the energy used in the start-up and shut-down cycles
To remove humidity and lower dry bulb temperature
40 degrees F
S-clips and drives (cleats)

47. What are the two types of package units?
Side-by-side and over-and-under
Any amount
Duct - electrical - and mechanical
RLA/FLA x 5

48. Sections of duct board can be fastened together with what?
It rises
Staples and tape
It rises
8-12 degrees F

49. In what state is the refrigerant in the compressor?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
150
Vapor
Subtract ambient temperature from 100

50. The fan switch closes at what temperature?
15% silphos
140 degrees F
RLA/FLA x 5
Negative