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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. How are round ducts supported?

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2. What is the range for normal superheat and subcooling?
8-12 degrees F
Yes
40 degrees F
Yes

3. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
By increasing the surface of the condenser coil
S-clips and drives (cleats)
30 degrees F
Compressor

4. When do you install an auxillary drain pan?
ACR (air-conditioning refrigeration) tubing
It will be low
Inside diameter (ID)
When it is above a conditioned space

5. The evaporator is designed to remove what two types of heat?
Latent and sensible
Nitrogen with a small amount of refrigerant
150
30-35 degrees above ambient

6. How do you calculate EER?
Btu/hr (output) / wattage (input)
To lower the amount of pressure drop through the coil
100
15% silphos

7. What is the normal evaporator temperature?
Duct with insulation on the inside
It will be high
45 degrees F
Vapor

8. Which type of wire can handle a higher ampacity?
Stranded
Suction
It also rises
Rise

9. 6' round duct has a ballpark cfm of what?
Average feet per minute X area in square feet (H' x W'/144)
30-35 degrees above ambient
100
Nominal-sized tubing

10. How many BTU's per ton?
Common
In parallel
12000
20 A

11. The fan switch closes at what temperature?
Inches of water column (in. WC)
140 degrees F
Inclined manometer
With an are rating

12. 6' round duct has a ballpark cfm of what?
100
20 degrees F
In series
8-12 degrees F

13. If pressure rises - what happens to the superheat?
15 A
Indoor fan motor - outdoor fan motor - and the compressor
When the system is under pressure
It rises

14. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
Shorted winding - open winding - and grounded winding
With an are rating
Inches of water column (in. WC)

15. What is the normal evaporator temperature?
40 A
45 degrees F
To remove humidity and lower dry bulb temperature
Yes

16. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Suction
In series
Potential relay and start capacitor
It rises

17. If the rpm's are 3450 - how many poles does the motor have?
1/4'
To remove humidity and lower dry bulb temperature
2
High

18. What is it called when liquid refrigerant gets into the compressor?
Staples and tape
Compressor
400
Slugging

19. What do you use to connect square and rectangular ductboard together?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
2 minutes
6
S-clips and drives (cleats)

20. What sort of pressure will a pull-through evaporator have?
Negative
100
It will be high
30 degrees F

21. How is nominal-sized tubing sized?
20 degrees above ambient
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Inside diameter (ID)

22. Will a dirty condenser cause a rise or fall in pressure?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Latent and sensible
SEER includes the energy used in the start-up and shut-down cycles
Rise

23. Superheat should never be below how many degrees
5 degrees
Outside diameter (OD)
400
30-35 degrees above ambient

24. Does a package unit come from the factory pre-charged?
Compressor
12000
Yes
Inches of water column (in. WC)

25. What tool is used to expand the diameter of soft copper tubing
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A swaging tool
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Inclined manometer

26. How many cfm per ton?
The takeoff fitting
Outside diameter (OD)
Belt drive and direct drive
400

27. If the suction pressure rises - what happens to the head pressure?
It also rises
Yes
When it is a pull-through evaporator
A dirty evaporator

28. What do you use to check for leaks?
Before the vent
They are physically larger
A bypass duct or a dump zone
Nitrogen with a small amount of refrigerant

29. If the rpm's are 3450 - how many poles does the motor have?
2
400
Over/under and side by side
In series

30. When do you install a trap on a drain line?
30 degrees F
Individual return air systems and central return air systems
30-35 degrees above ambient
When it is a pull-through evaporator

31. What are the three pressures created by moving air in ductwork?
They are larger
A piston type metering device
Static pressure - velocity pressure - and total pressure
Yes

32. 13 SEER is classified as what kind of efficiency?
High
Potential relay and start capacitor
Staples and tape
150

33. When must a copper joint never be soldered or brazed?
When the system is under pressure
L-type
Yes
15% silphos

34. How is flexible duct supported?
A band 4 inches or more in width
Suction
Potential relay and start capacitor
Blended refrigerants

35. 9' round duct has a ballpark cfm of what?
300
Yes
105 degrees F
L-type

36. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
Average feet per minute X area in square feet (H' x W'/144)
A piston type metering device
8

37. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Standard
400
L-type

38. How many amps can 14 g wire handle?
Static pressure - velocity pressure - and total pressure
When it is above a conditioned space
15 A
It rises

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

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40. What is the typical pressure differance across a TXV?
Suction
It rises
100 psig
18 gauge

41. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Indoor fan motor - outdoor fan motor - and the compressor
Vapor
High

42. How do you calculate LRA?
12000
Below 800 degrees F
100 psig
RLA/FLA x 5

43. If the rpm's are 1050 - how many poles does the motor have?
Before the vent
6
Individual return air systems and central return air systems
5 degrees

44. Do you need a vent on a pull-through evaporator?
Latent and sensible
Positive
Below 800 degrees F
Yes

45. What kind of copper tubing is used for plumbing and heating applications?
It rises
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Nominal-sized tubing
Vapor

46. What is used to measure static air pressure in ducts.
Inclined manometer
To lower the amount of pressure drop through the coil
40 degrees F
Dehydrated with caps on each end

47. The evaporator is designed to remove what two types of heat?
Dehydrated with caps on each end
Latent and sensible
Slugging
In parallel

48. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
15% silphos
With an are rating
In series
40 degrees F

49. In what state is the refrigerant in the compressor?
Pi x radius squared
15% silphos
Outside diameter (OD)
Vapor

50. Do you need a vent on a push-through evaporator?
Pull a vacuum
Yes
With an are rating
8