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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. What is a package unit?
30 degrees F
True
The takeoff fitting
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

2. What gauge is thermostat wire?
Blended refrigerants
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
18 gauge
L-type

3. 7' round duct has a ballpark cfm of what?
A bypass duct or a dump zone
150
45 degrees F
Inclined manometer

4. 13 SEER is classified as what kind of efficiency?
A diffuser
High
100
Positive

5. What sort of pressure will a pull-through evaporator have?
200
High
Duct - electrical - and mechanical
Negative

6. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
With a minimum of three evenly spaced self-tapping screws
Average feet per minute X area in square feet (H' x W'/144)
In series
Standard

7. What is the range for normal superheat and subcooling?
Dehydrated with caps on each end
8-12 degrees F
When it is a pull-through evaporator
300

8. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
105 degrees F
15% silphos
A band 4 inches or more in width
To lower the amount of pressure drop through the coil

9. How do you calculate LRA?
It will be low
In series
RLA/FLA x 5
Outside of the male fitting

10. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Duct with insulation on the inside
In series
Indoor fan motor - outdoor fan motor - and the compressor
Pistons

11. Most duct insulation is made of what?
Fiberglass
With a minimum of three evenly spaced self-tapping screws
No
Over/under and side by side

12. Why are some ACR tubing lines insulated?
TXV
6
Staples and tape
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

13. What is considered normal operating conditions?
Btu/hr (output) / wattage (input)
Belt drive and direct drive
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
140 degrees F

14. What kind of metering device do high-efficiency units usually use?
TXV
20 degrees above ambient
40 degrees F
6

15. If the rpm's are 1750 - how many poles does the motor have?
TXV
30 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
4

16. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Positive
On the common terminal
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

17. How is insulation around a duct rated?
Yes
Standard
With an are rating
Before the vent

18. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Yes
400
L-type
A bypass duct or a dump zone

19. How long should you leave a system off once you kill power before restarting it?
Slugging
2 minutes
Before the vent
Individual return air systems and central return air systems

20. How do you calculate ballpark superheat?
SEER includes the energy used in the start-up and shut-down cycles
Yes
Subtract ambient temperature from 100
A bypass duct or a dump zone

21. What sort of pressure will a pull-through evaporator have?
In parallel
Negative
They are physically larger
When it is above a conditioned space

22. How many amps can 8 g wire handle?
Boil the liquid refrigerant out ot the oil within the crankcase
40 A
8-12 degrees F
Heat loss

23. What do you use to connect square and rectangular ductboard together?
200
S-clips and drives (cleats)
Before the vent
When it is a pull-through evaporator

24. 6' round duct has a ballpark cfm of what?
A diffuser
TXV
100
140 degrees F

25. How is the high pressure switch wired with the low pressure switch?
300
40 degrees F
Infiltration and ventilation
In parallel

26. How does ACR copper pipe come?
Pi x radius squared
Slugging
A diffuser
Dehydrated with caps on each end

27. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
A dirty evaporator
Infiltration and ventilation
200

28. How are round ducts supported?

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29. How many amps can 14 g wire handle?
15 A
Staples and tape
Rise
To remove humidity and lower dry bulb temperature

30. At what temperature will brazing melt?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
SEER includes the energy used in the start-up and shut-down cycles
Over 800 degrees F
40 A

31. Sections of duct board can be fastened together with what?
Boil the liquid refrigerant out ot the oil within the crankcase
Latent and sensible
A swaging tool
Staples and tape

32. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
To lower the amount of pressure drop through the coil
Static pressure - velocity pressure - and total pressure
Yes

33. What percentage silver do you need to use for an are-410 system?
15% silphos
By increasing the surface of the condenser coil
Btu/hr (output) / wattage (input)
Inclined manometer

34. Which type of wire can handle a higher ampacity?
Standard
Yes
Stranded
15 A

35. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
45 degrees F
Shorted winding - open winding - and grounded winding
Fiberglass
They are physically larger

36. Which is more efficient - a TXV or a fixed-orifice metering device?
Indoor fan motor - outdoor fan motor - and the compressor
400
TXV
Positive

37. How do you calculate EER?
Outside of the male fitting
Btu/hr (output) / wattage (input)
12000
200

38. When do you install a trap on a drain line?
Subtract ambient temperature from 100
When it is a pull-through evaporator
ACR (air-conditioning refrigeration) tubing
105 degrees F

39. How do you calculate ballpark superheat?
Common
400
Subtract ambient temperature from 100
Pull a vacuum

40. What are the two types of return air systems in residential installations?
200
Individual return air systems and central return air systems
Subtract ambient temperature from 100
25-ft or 50-ft

41. How do you calculate EER?
Blended refrigerants
A dirty evaporator
Btu/hr (output) / wattage (input)
TXV

42. If the rpm's are 3450 - how many poles does the motor have?
Side-by-side and over-and-under
2
It also rises
Blended refrigerants

43. How many amps can 14 g wire handle?
15 A
5 degrees
12000
Over 800 degrees F

44. 9' round duct has a ballpark cfm of what?
300
By increasing the surface of the condenser coil
They are physically larger
8

45. What type of air conditioning system must be charged using the superheat method?
Common
Yes
A piston type metering device
The takeoff fitting

46. If the suction pressure rises - what happens to the head pressure?
Suction
When the system is under pressure
It also rises
30-35 degrees above ambient

47. What is it called when liquid refrigerant gets into the compressor?
They are physically larger
Nitrogen with a small amount of refrigerant
In parallel
Slugging

48. What are the two types of package units?
2
Potential relay and start capacitor
A diffuser
Side-by-side and over-and-under

49. What are the three crafts normally associated with an air-conditioned installation?
Pi x radius squared
5 degrees
Duct - electrical - and mechanical
TXV

50. 6' round duct has a ballpark cfm of what?
Yes
100
Yes
30 A