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 trap on a pull-through evaporator?
25-ft or 50-ft
Yes
Dehydrated with caps on each end
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

2. Do you need a vent on a pull-through evaporator?
Duct with insulation on the inside
20 degrees above ambient
Yes
20 A

3. What is the typical pressure differance across a TXV?
True
100 psig
The takeoff fitting
Blended refrigerants

4. Can refrigerant line sets be altered in length?
Yes
Yes
Inclined manometer
L-type

5. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30-35 degrees above ambient
Duct with insulation on the inside
30 degrees F
Suction

6. What is the range for normal superheat and subcooling?
30-35 degrees above ambient
A swaging tool
140 degrees F
8-12 degrees F

7. Sections of duct board can be fastened together with what?
By increasing the surface of the condenser coil
Staples and tape
300
Yes

8. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
SEER includes the energy used in the start-up and shut-down cycles
In series
They are larger
300

9. What distributes supply air to a room in a structure?
A diffuser
Any amount
SEER includes the energy used in the start-up and shut-down cycles
They are physically larger

10. What are the two types of blower drives?
With an are rating
300
Outside of the male fitting
Belt drive and direct drive

11. A reciprocating compressor has what sort of moving parts?
True
Pistons
Duct - electrical - and mechanical
With an are rating

12. At what temperature will brazing melt?
To lower the amount of pressure drop through the coil
Over 800 degrees F
When it is above a conditioned space
Belt drive and direct drive

13. If the rpm's are 1050 - how many poles does the motor have?
Negative
It rises
Vapor
6

14. What kind of metering device do high-efficiency units usually use?
L-type
TXV
Individual return air systems and central return air systems
Inches of water column (in. WC)

15. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Duct with insulation on the inside
It also rises
In series
4

16. 6' round duct has a ballpark cfm of what?
It will have a decrease in superheat
In parallel
100
Compressor

17. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
When it is above a conditioned space
It will be low
True
Yes

18. At what temperature will soft solder melt?
Below 800 degrees F
With 4' saddles
A band 4 inches or more in width
When it is a pull-through evaporator

19. What are the two types of package units?
A swaging tool
L-type
Side-by-side and over-and-under
SEER includes the energy used in the start-up and shut-down cycles

20. 9' round duct has a ballpark cfm of what?
Heat load
A piston type metering device
300
100

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

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22. At what temperature does refrigerant condense in a standard-efficiency unit?
A bypass duct or a dump zone
The takeoff fitting
30-35 degrees above ambient
30 degrees F

23. What is the range for normal superheat and subcooling?
8-12 degrees F
It will be low
SEER includes the energy used in the start-up and shut-down cycles
Over/under and side by side

24. The compressor is cooled by liquid refrigerant. (True of False)
False
A diffuser
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Subtract ambient temperature from 100

25. How many amps can 8 g wire handle?
5 degrees
40 A
40 degrees F
Positive

26. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
RLA/FLA x 5
400
Average feet per minute X area in square feet (H' x W'/144)

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

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28. What are the three major power-consuming devices on an air-conditioning system?
400
Indoor fan motor - outdoor fan motor - and the compressor
ACR (air-conditioning refrigeration) tubing
The takeoff fitting

29. On what terminal do you check amperage?
Common
Inclined manometer
Standard
Average feet per minute X area in square feet (H' x W'/144)

30. What distributes supply air to a room in a structure?
A diffuser
L-type
Individual return air systems and central return air systems
True

31. How many amps can 8 g wire handle?
40 A
4
Side-by-side and over-and-under
Yes

32. How long should you leave a system off once you kill power before restarting it?
On the common terminal
105 degrees F
2 minutes
Rise

33. The evaporator is designed to remove what two types of heat?
Latent and sensible
400
SEER includes the energy used in the start-up and shut-down cycles
Shorted winding - open winding - and grounded winding

34. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
40 degrees F
15 A
Duct - electrical - and mechanical

35. The A/C size is calculated by what?
Nominal-sized tubing
140 degrees F
Heat load
Nominal-sized tubing

36. Do you need a vent on a push-through evaporator?
A bypass duct or a dump zone
Yes
A dirty evaporator
Rise

37. What kind of copper tubing is used for plumbing and heating applications?
40 degrees F
Btu/hr (output) / wattage (input)
Heat loss
Nominal-sized tubing

38. 7' round duct has a ballpark cfm of what?
40 A
Fiberglass
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
150

39. 7' round duct has a ballpark cfm of what?
400
150
When the system is under pressure
100

40. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
Pistons
105 degrees F
TXV

41. 10 SEER is classified as what kind of efficiency?
On the common terminal
Standard
A dirty evaporator
30 degrees F

42. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
L-type
Over/under and side by side
30 degrees F
To lower the amount of pressure drop through the coil

43. At what temperature does refrigerant condense in a high-efficiency unit?
Pi x radius squared
By increasing the surface of the condenser coil
Shorted winding - open winding - and grounded winding
20 degrees above ambient

44. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
It will be low
Yes
Slugging

45. How many amps can 14 g wire handle?
20 degrees above ambient
15 A
40 degrees F
It also rises

46. How is insulation around a duct rated?
Blended refrigerants
With an are rating
Slugging
25-ft or 50-ft

47. 10' round duct has a ballpark cfm of what?
When it is above a conditioned space
SEER includes the energy used in the start-up and shut-down cycles
400
A band 4 inches or more in width

48. The crankcase heater on an air-conditioning compressor is used to what?
140 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
Latent and sensible
TXV

49. Superheat should never be below how many degrees
5 degrees
A swaging tool
With 4' saddles
Standard

50. How do you calculate LRA?
Dehydrated with caps on each end
Blended refrigerants
8
RLA/FLA x 5