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. How do you calculate cfm?

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2. The crankcase heater on an air-conditioning compressor is used to what?
Yes
Compressor
Boil the liquid refrigerant out ot the oil within the crankcase
12000

3. The crankcase heater on an air-conditioning compressor is used to what?
RLA/FLA x 5
Staples and tape
Boil the liquid refrigerant out ot the oil within the crankcase
1/4'

4. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
True
They are physically larger
When it is above a conditioned space
It will have a decrease in superheat

5. How many amps can 12 g wire handle?
Nominal-sized tubing
20 A
On the common terminal
12000

6. When do you install a trap on a drain line?
Heat load
When it is above a conditioned space
When it is a pull-through evaporator
Duct with insulation on the inside

7. What gauge is thermostat wire?
L-type
Common
12000
18 gauge

8. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Yes
With 4' saddles
Stranded

9. If the rpm's are 1050 - how many poles does the motor have?
20 degrees above ambient
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
6

10. How many BTU's per ton?
True
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Pi x radius squared
12000

11. Which is more efficient - a TXV or a fixed-orifice metering device?
140 degrees F
A swaging tool
Inside diameter (ID)
TXV

12. What type of air conditioning system must be charged using the superheat method?
When the system is under pressure
Below 800 degrees F
6
A piston type metering device

13. The compressor is cooled by liquid refrigerant. (True of False)
Duct - electrical - and mechanical
300
False
SEER includes the energy used in the start-up and shut-down cycles

14. On what terminal do you check amperage?
Belt drive and direct drive
Common
L-type
Inside diameter (ID)

15. Why are some ACR tubing lines insulated?
1/4'
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
45-55%
RLA/FLA x 5

16. 7' round duct has a ballpark cfm of what?
Yes
Indoor fan motor - outdoor fan motor - and the compressor
150
40 degrees F

17. Do you need a vent on a push-through evaporator?
Yes
100
ACR (air-conditioning refrigeration) tubing
30 A

18. Will a dirty condenser cause a rise or fall in pressure?
Individual return air systems and central return air systems
A swaging tool
True
Rise

19. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Negative
Latent and sensible
To lower the amount of pressure drop through the coil
30 degrees F

20. How is ACR tubing sized?
Individual return air systems and central return air systems
Outside diameter (OD)
4
Below 800 degrees F

21. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Average feet per minute X area in square feet (H' x W'/144)
Below 800 degrees F
In series
6

22. At what temperature does refrigerant condense in a standard-efficiency unit?
With a minimum of three evenly spaced self-tapping screws
Over/under and side by side
No
30-35 degrees above ambient

23. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Outside of the male fitting
It will have a decrease in superheat
True

24. What are normal conditions - as defined by the ARI.
A dirty evaporator
Over/under and side by side
Blended refrigerants
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

25. 9' round duct has a ballpark cfm of what?
300
5 degrees
False
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

26. Where do you apply flux when soldering?
Outside of the male fitting
True
True
A dirty evaporator

27. What are the two ways that fresh air enters a structure?
Potential relay and start capacitor
Heat load
Infiltration and ventilation
25-ft or 50-ft

28. If the rpm's are 1750 - how many poles does the motor have?
4
A dirty evaporator
Dehydrated with caps on each end
By increasing the surface of the condenser coil

29. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Individual return air systems and central return air systems
150
20 degrees F
It will be low

30. What are the three pressures created by moving air in ductwork?
Pull a vacuum
A band 4 inches or more in width
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Static pressure - velocity pressure - and total pressure

31. What is lined duct?
They are larger
Duct with insulation on the inside
100 psig
Shorted winding - open winding - and grounded winding

32. When must a copper joint never be soldered or brazed?
Over/under and side by side
When the system is under pressure
30-35 degrees above ambient
Infiltration and ventilation

33. What is the name of the fitting where the branch line leaves the duct?
The suction line or the low-pressure side
Dehydrated with caps on each end
Staples and tape
The takeoff fitting

34. What sort of pressure will a pull-through evaporator have?
Side-by-side and over-and-under
15% silphos
Negative
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

35. If the suction pressure rises - what happens to the head pressure?
Infiltration and ventilation
30 degrees F
It also rises
No

36. Which type of wire can handle a higher ampacity?
Inside diameter (ID)
Stranded
150
200

37. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
Before the vent
With 4' saddles
Over/under and side by side

38. How are round ducts supported?

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39. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees F
A band 4 inches or more in width
20 degrees above ambient
2

40. How long should you leave a system off once you kill power before restarting it?
Yes
It will be high
2 minutes
6

41. The load on the evaporater will effect which pressure?
Inside diameter (ID)
Heat load
Suction
SEER includes the energy used in the start-up and shut-down cycles

42. How do you achieve high-efficiency?
Subtract ambient temperature from 100
20 degrees above ambient
By increasing the surface of the condenser coil
A bypass duct or a dump zone

43. Superheat should never be below how many degrees
40 degrees F
SEER includes the energy used in the start-up and shut-down cycles
5 degrees
Nominal-sized tubing

44. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Static pressure - velocity pressure - and total pressure
100 psig
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

45. When must a copper joint never be soldered or brazed?
When the system is under pressure
1/4'
By increasing the surface of the condenser coil
TXV

46. If the rpm's are 1050 - how many poles does the motor have?
6
Suction
20 degrees F
Nominal-sized tubing

47. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
8
To remove humidity and lower dry bulb temperature
Inclined manometer
L-type

48. If the suction pressure rises - what happens to the head pressure?
It also rises
Slugging
4
Suction

49. How will too much refrigerant effect superheat?
Individual return air systems and central return air systems
It will be low
5 degrees
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

50. How is ACR tubing sized?
2
Staples and tape
Duct with insulation on the inside
Outside diameter (OD)