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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 can cause a decrease in suction pressure on an air-conditioning system?
By increasing the surface of the condenser coil
Inches of water column (in. WC)
A dirty evaporator
400

2. What kind of refrigeratnts must be added in liquid form?
105 degrees F
300
Nominal-sized tubing
Blended refrigerants

3. 6' round duct has a ballpark cfm of what?
105 degrees F
200
Vapor
100

4. What do you use to connect square and rectangular ductboard together?
Vapor
40 A
It will be high
S-clips and drives (cleats)

5. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
When it is above a conditioned space
20 degrees above ambient
Standard

6. How many amps can 10 g wire handle?
30 A
Rise
Heat loss
Dehydrated with caps on each end

7. What do you do after you braze a system?
20 degrees F
Pull a vacuum
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

8. What percentage silver do you need to use for an are-410 system?
15% silphos
In parallel
200
Nominal-sized tubing

9. What do you use to check for leaks?
When the system is under pressure
30 degrees F
Nitrogen with a small amount of refrigerant
A bypass duct or a dump zone

10. How do you achieve high-efficiency?
When it is above a conditioned space
By increasing the surface of the condenser coil
A band 4 inches or more in width
RLA/FLA x 5

11. Why are some ACR tubing lines insulated?
Before the vent
Slugging
Blended refrigerants
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

12. Pressure in ductwork is measured In what?
40 A
Inches of water column (in. WC)
Rise
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

13. How will too much refrigerant effect superheat?
18 gauge
It will be low
In series
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

14. What are normal conditions - as defined by the ARI.
40 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
5 degrees
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

15. How are round ducts connected to one another?
30-35 degrees above ambient
Compressor
High
With a minimum of three evenly spaced self-tapping screws

16. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
To lower the amount of pressure drop through the coil
Positive
Staples and tape

17. How do you achieve high-efficiency?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
By increasing the surface of the condenser coil
It rises
Btu/hr (output) / wattage (input)

18. How many amps can 12 g wire handle?
5 degrees
Outside of the male fitting
2 minutes
20 A

19. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
140 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Any amount

20. The furnace size is calculated by what?
40 degrees F
Nominal-sized tubing
Belt drive and direct drive
Heat loss

21. What distributes supply air to a room in a structure?
True
It will be high
A diffuser
Shorted winding - open winding - and grounded winding

22. Do you need a trap on a push-through evaporator?
No
40 A
20 A
Inside diameter (ID)

23. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
150
It will have a decrease in superheat
A bypass duct or a dump zone

24. If the rpm's are 1050 - how many poles does the motor have?
6
Over 800 degrees F
To remove humidity and lower dry bulb temperature
Pistons

25. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
Standard
300
2

26. Which is more efficient - a TXV or a fixed-orifice metering device?
The takeoff fitting
140 degrees F
TXV
Fiberglass

27. What is the range for normal superheat and subcooling?
Dehydrated with caps on each end
In series
8-12 degrees F
With 4' saddles

28. When must a copper joint never be soldered or brazed?
30 A
20 degrees F
High
When the system is under pressure

29. How does ACR copper pipe come?
Yes
Over 800 degrees F
Btu/hr (output) / wattage (input)
Dehydrated with caps on each end

30. What is considered normal operating conditions?
45 degrees F
30 A
Below 800 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

31. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Boil the liquid refrigerant out ot the oil within the crankcase
8
Any amount
Before the vent

32. How do you calculate cfm?

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33. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
It rises
Any amount
25-ft or 50-ft
Nitrogen with a small amount of refrigerant

34. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Before the vent
5 degrees
140 degrees F

35. What percentage silver do you need to use for an are-410 system?
15% silphos
Yes
It will be high
2 minutes

36. Sections of duct board can be fastened together with what?
Below 800 degrees F
When the system is under pressure
Staples and tape
Nitrogen with a small amount of refrigerant

37. At what temperature will brazing melt?
Heat loss
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Over 800 degrees F
Inclined manometer

38. Do you need a vent on a pull-through evaporator?
Heat load
It also rises
On the common terminal
Yes

39. The crankcase heater on an air-conditioning compressor is used to what?
5 degrees
When it is above a conditioned space
Boil the liquid refrigerant out ot the oil within the crankcase
100 psig

40. Where do you apply flux when soldering?
2
When the system is under pressure
Outside of the male fitting
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

41. Do you need a vent on a push-through evaporator?
Average feet per minute X area in square feet (H' x W'/144)
Common
Yes
Yes

42. Will a dirty condenser cause a rise or fall in pressure?
Yes
Nominal-sized tubing
Rise
105 degrees F

43. When do you install a trap on a drain line?
When it is a pull-through evaporator
Heat load
45 degrees F
Standard

44. What tool is used to expand the diameter of soft copper tubing
When it is above a conditioned space
TXV
30-35 degrees above ambient
A swaging tool

45. What are the three crafts normally associated with an air-conditioned installation?
30-35 degrees above ambient
In series
Duct - electrical - and mechanical
25-ft or 50-ft

46. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
When it is a pull-through evaporator
300

47. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
To remove humidity and lower dry bulb temperature
When the system is under pressure
A dirty evaporator

48. How will too much refrigerant effect superheat?
Yes
Btu/hr (output) / wattage (input)
ACR (air-conditioning refrigeration) tubing
It will be low

49. 10 SEER is classified as what kind of efficiency?
4
True
Standard
105 degrees F

50. How is the high pressure switch wired with the low pressure switch?
In parallel
40 degrees F
12000
The suction line or the low-pressure side