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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. At what temperature does refrigerant condense in a standard-efficiency unit?
Infiltration and ventilation
30-35 degrees above ambient
TXV
Btu/hr (output) / wattage (input)

2. What gauge is thermostat wire?
SEER includes the energy used in the start-up and shut-down cycles
18 gauge
Yes
105 degrees F

3. At what temperature does refrigerant condense in a standard-efficiency unit?
Potential relay and start capacitor
30-35 degrees above ambient
When it is above a conditioned space
When it is above a conditioned space

4. How is the high pressure switch wired with the low pressure switch?
In parallel
20 degrees above ambient
6
It rises

5. If the rpm's are 750 - how many poles does the motor have?
Boil the liquid refrigerant out ot the oil within the crankcase
8
To remove humidity and lower dry bulb temperature
Static pressure - velocity pressure - and total pressure

6. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
It also rises
Belt drive and direct drive
400

7. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
TXV
With an are rating
High

8. How many amps can 14 g wire handle?
18 gauge
20 degrees above ambient
15 A
40 degrees F

9. How many cfm per ton?
18 gauge
Side-by-side and over-and-under
It will be high
400

10. What component changes refrigerant from a low pressure gas to a high pressure gas?
Over 800 degrees F
Compressor
Inches of water column (in. WC)
Btu/hr (output) / wattage (input)

11. What are the two functions of the air-conditioning system?
With a minimum of three evenly spaced self-tapping screws
It will have a decrease in superheat
Staples and tape
To remove humidity and lower dry bulb temperature

12. Superheat should never be below how many degrees
5 degrees
Nitrogen with a small amount of refrigerant
2 minutes
High

13. What do you use to connect square and rectangular ductboard together?
40 degrees F
S-clips and drives (cleats)
It will be high
With 4' saddles

14. How are round ducts supported?

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15. What do you use to check for leaks?
Indoor fan motor - outdoor fan motor - and the compressor
In series
8-12 degrees F
Nitrogen with a small amount of refrigerant

16. What kind of refrigeratnts must be added in liquid form?
No
6
Side-by-side and over-and-under
Blended refrigerants

17. The evaporator is designed to remove what two types of heat?
30-35 degrees above ambient
Boil the liquid refrigerant out ot the oil within the crankcase
When it is a pull-through evaporator
Latent and sensible

18. What are the two types of package units?
Slugging
8-12 degrees F
Side-by-side and over-and-under
It also rises

19. What tool is used to expand the diameter of soft copper tubing
45-55%
A swaging tool
40 degrees F
400

20. What are the components of a hard-start kit?
Compressor
15 A
Suction
Potential relay and start capacitor

21. How do you calculate ballpark superheat?
Heat loss
Blended refrigerants
Dehydrated with caps on each end
Subtract ambient temperature from 100

22. If the suction pressure rises - what happens to the head pressure?
2
A swaging tool
It also rises
TXV

23. What is used to measure static air pressure in ducts.
Stranded
20 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Inclined manometer

24. How many amps can 8 g wire handle?
40 A
100
6
When the system is under pressure

25. What distributes supply air to a room in a structure?
Inclined manometer
A diffuser
When it is above a conditioned space
To remove humidity and lower dry bulb temperature

26. How will too much refrigerant effect superheat?
A piston type metering device
300
Average feet per minute X area in square feet (H' x W'/144)
It will be low

27. The load on the evaporater will effect which pressure?
Average feet per minute X area in square feet (H' x W'/144)
Suction
A bypass duct or a dump zone
15% silphos

28. What is the difference between SEER and EER?
It will be high
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Over/under and side by side
SEER includes the energy used in the start-up and shut-down cycles

29. Which type of wire can handle a higher ampacity?
Stranded
When it is a pull-through evaporator
Over 800 degrees F
Outside of the male fitting

30. Do you need a trap on a push-through evaporator?
Yes
No
Inches of water column (in. WC)
15% silphos

31. How do you calculate LRA?
Below 800 degrees F
They are larger
RLA/FLA x 5
300

32. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
S-clips and drives (cleats)
Subtract ambient temperature from 100
Yes

33. In what state is the refrigerant in the compressor?
300
Over 800 degrees F
Vapor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

34. Why are some ACR tubing lines insulated?
Subtract ambient temperature from 100
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Duct with insulation on the inside
Yes

35. Where do you check the amps on a motor?
On the common terminal
400
400
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

36. What is a package unit?
A piston type metering device
It rises
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
400

37. How many amps can 10 g wire handle?
30 A
S-clips and drives (cleats)
Any amount
TXV

38. What are the three major power-consuming devices on an air-conditioning system?
On the common terminal
Over/under and side by side
Individual return air systems and central return air systems
Indoor fan motor - outdoor fan motor - and the compressor

39. Can refrigerant line sets be altered in length?
Yes
200
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes

40. 9' round duct has a ballpark cfm of what?
300
Vapor
Heat loss
105 degrees F

41. How many amps can 8 g wire handle?
Pi x radius squared
40 A
Rise
Suction

42. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Shorted winding - open winding - and grounded winding
ACR (air-conditioning refrigeration) tubing
Indoor fan motor - outdoor fan motor - and the compressor
A bypass duct or a dump zone

43. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
4
Boil the liquid refrigerant out ot the oil within the crankcase
They are physically larger
2

44. What type of air conditioning system must be charged using the superheat method?
A diffuser
300
A piston type metering device
A diffuser

45. What are the four materials used to make duct?
Vapor
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
40 degrees F
300

46. What distributes supply air to a room in a structure?
On the common terminal
A diffuser
2 minutes
Latent and sensible

47. What kind of refrigeratnts must be added in liquid form?
Any amount
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Blended refrigerants

48. What sort of pressure will a push-through evaporator have?
To remove humidity and lower dry bulb temperature
15 A
Positive
5 degrees

49. 7' round duct has a ballpark cfm of what?
150
Stranded
140 degrees F
100 psig

50. What sort of pressure will a push-through evaporator have?
Positive
No
The takeoff fitting
Duct - electrical - and mechanical