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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 kind of metering device do high-efficiency units usually use?
Pi x radius squared
TXV
Fiberglass
20 A

2. What kind of refrigeratnts must be added in liquid form?
It also rises
1/4'
The takeoff fitting
Blended refrigerants

3. What component changes refrigerant from a low pressure gas to a high pressure gas?
15 A
A diffuser
Compressor
Inside diameter (ID)

4. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Compressor
Heat load
15 A
They are physically larger

5. Do you need a vent on a push-through evaporator?
Below 800 degrees F
15 A
When it is a pull-through evaporator
Yes

6. What type of air conditioning system must be charged using the superheat method?
Duct - electrical - and mechanical
Average feet per minute X area in square feet (H' x W'/144)
Over 800 degrees F
A piston type metering device

7. When do you install an auxillary drain pan?
Blended refrigerants
With a minimum of three evenly spaced self-tapping screws
When it is above a conditioned space
Infiltration and ventilation

8. What is lined duct?
Over 800 degrees F
Duct with insulation on the inside
100 psig
Pistons

9. What are the two types of package units?
40 degrees F
Side-by-side and over-and-under
18 gauge
Yes

10. What are the two types of package units?
The suction line or the low-pressure side
Side-by-side and over-and-under
18 gauge
To lower the amount of pressure drop through the coil

11. Where do you apply flux when soldering?
Outside of the male fitting
A piston type metering device
Any amount
Slugging

12. What are the three ways a motor can fail electrically?
Vapor
20 A
Static pressure - velocity pressure - and total pressure
Shorted winding - open winding - and grounded winding

13. What gauge is thermostat wire?
When the system is under pressure
High
TXV
18 gauge

14. Do you need a vent on a pull-through evaporator?
Yes
20 degrees above ambient
400
Boil the liquid refrigerant out ot the oil within the crankcase

15. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
30-35 degrees above ambient
Negative
100

16. What is the typical pressure differance across a TXV?
100 psig
S-clips and drives (cleats)
400
Infiltration and ventilation

17. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
150
Infiltration and ventilation
Vapor

18. What is it called when liquid refrigerant gets into the compressor?
Dehydrated with caps on each end
Vapor
The suction line or the low-pressure side
Slugging

19. How many cfm per ton?
In parallel
Suction
With a minimum of three evenly spaced self-tapping screws
400

20. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
Before the vent
5 degrees
Outside diameter (OD)

21. Most duct insulation is made of what?
TXV
It will have a decrease in superheat
300
Fiberglass

22. Pressure in ductwork is measured In what?
To remove humidity and lower dry bulb temperature
400
1/4'
Inches of water column (in. WC)

23. When do you install an auxillary drain pan?
When it is above a conditioned space
Pull a vacuum
TXV
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

24. What is considered normal operating conditions?
The suction line or the low-pressure side
A piston type metering device
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
400

25. How is flexible duct supported?
140 degrees F
It will be low
A band 4 inches or more in width
2

26. If the rpm's are 3450 - how many poles does the motor have?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
2
Any amount
20 degrees F

27. What type of air conditioning system must be charged using the superheat method?
Before the vent
A piston type metering device
Fiberglass
Duct with insulation on the inside

28. 7' round duct has a ballpark cfm of what?
A dirty evaporator
25-ft or 50-ft
2 minutes
150

29. What are the three pressures created by moving air in ductwork?
It also rises
Shorted winding - open winding - and grounded winding
S-clips and drives (cleats)
Static pressure - velocity pressure - and total pressure

30. What is the typical pressure differance across a TXV?
100 psig
Over 800 degrees F
Staples and tape
Side-by-side and over-and-under

31. Will a dirty condenser cause a rise or fall in pressure?
Negative
With 4' saddles
100 psig
Rise

32. How many BTU's per ton?
2 minutes
12000
It will have a decrease in superheat
Inside diameter (ID)

33. How many amps can 8 g wire handle?
L-type
SEER includes the energy used in the start-up and shut-down cycles
Shorted winding - open winding - and grounded winding
40 A

34. Do you need a trap on a pull-through evaporator?
Fiberglass
Latent and sensible
45-55%
Yes

35. What gauge is thermostat wire?
Inclined manometer
Stranded
18 gauge
Side-by-side and over-and-under

36. The load on the evaporater will effect which pressure?
Pi x radius squared
Suction
A bypass duct or a dump zone
They are physically larger

37. What are the two types of blower drives?
Belt drive and direct drive
15 A
Subtract ambient temperature from 100
S-clips and drives (cleats)

38. How many BTU's per ton?
12000
45-55%
300
100 psig

39. What is the normal evaporator temperature?
45 degrees F
Yes
Nominal-sized tubing
100

40. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Outside diameter (OD)
45-55%
Belt drive and direct drive

41. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It also rises
Outside diameter (OD)
Individual return air systems and central return air systems

42. Do you need a trap on a pull-through evaporator?
Yes
20 A
Negative
Pi x radius squared

43. Can refrigerant line sets be altered in length?
Shorted winding - open winding - and grounded winding
150
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Yes

44. What are the components of a hard-start kit?
When it is above a conditioned space
150
Blended refrigerants
Potential relay and start capacitor

45. 10' round duct has a ballpark cfm of what?
ACR (air-conditioning refrigeration) tubing
When the system is under pressure
True
400

46. How long should you leave a system off once you kill power before restarting it?
Common
S-clips and drives (cleats)
2 minutes
Individual return air systems and central return air systems

47. Superheat should never be below how many degrees
Below 800 degrees F
Negative
High
5 degrees

48. How is insulation around a duct rated?
With an are rating
20 degrees F
Before the vent
Latent and sensible

49. Where do you check the amps on a motor?
They are larger
15% silphos
TXV
On the common terminal

50. How do you calculate cfm?

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