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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 are the two types of blower drives?
Belt drive and direct drive
On the common terminal
TXV
400

2. How do you calculate cfm?

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3. What can cause a decrease in suction pressure on an air-conditioning system?
25-ft or 50-ft
105 degrees F
A dirty evaporator
Outside of the male fitting

4. What gauge is thermostat wire?
Standard
40 degrees F
18 gauge
To remove humidity and lower dry bulb temperature

5. At what temperature does refrigerant condense in a high-efficiency unit?
Outside diameter (OD)
By increasing the surface of the condenser coil
20 degrees above ambient
400

6. What is the difference between SEER and EER?
Infiltration and ventilation
SEER includes the energy used in the start-up and shut-down cycles
Latent and sensible
100

7. What is considered normal operating conditions?
Inside diameter (ID)
When it is above a conditioned space
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
30-35 degrees above ambient

8. What kind of refrigeratnts must be added in liquid form?
105 degrees F
It will be low
Blended refrigerants
20 degrees F

9. What percentage silver do you need to use for an are-410 system?
The suction line or the low-pressure side
Inclined manometer
15% silphos
25-ft or 50-ft

10. How do you calculate the area of a circle?
Duct with insulation on the inside
Pi x radius squared
When it is a pull-through evaporator
Infiltration and ventilation

11. Why are some ACR tubing lines insulated?
Potential relay and start capacitor
Individual return air systems and central return air systems
200
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

12. What are the components of a hard-start kit?
A diffuser
8
A piston type metering device
Potential relay and start capacitor

13. What is lined duct?
True
Duct with insulation on the inside
8-12 degrees F
Heat loss

14. The load on the evaporater will effect which pressure?
2 minutes
Suction
Inches of water column (in. WC)
SEER includes the energy used in the start-up and shut-down cycles

15. Where do you install a trap on a drain line?
A swaging tool
Before the vent
Over/under and side by side
A band 4 inches or more in width

16. What do you use to check for leaks?
S-clips and drives (cleats)
When it is a pull-through evaporator
Nitrogen with a small amount of refrigerant
No

17. What percentage silver do you need to use for an are-410 system?
40 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
15% silphos
30 degrees F

18. How does ACR copper pipe come?
Dehydrated with caps on each end
Duct with insulation on the inside
Blended refrigerants
Common

19. 9' round duct has a ballpark cfm of what?
ACR (air-conditioning refrigeration) tubing
A diffuser
Inclined manometer
300

20. What are the two types of blower drives?
The suction line or the low-pressure side
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Belt drive and direct drive
Average feet per minute X area in square feet (H' x W'/144)

21. What is used to measure static air pressure in ducts.
Inclined manometer
Side-by-side and over-and-under
A bypass duct or a dump zone
TXV

22. What tool is used to expand the diameter of soft copper tubing
In parallel
In series
A swaging tool
TXV

23. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
To remove humidity and lower dry bulb temperature
On the common terminal
Staples and tape

24. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
20 degrees F
Outside diameter (OD)
30 degrees F
Over/under and side by side

25. How do you calculate EER?
Btu/hr (output) / wattage (input)
Negative
TXV
Vapor

26. The crankcase heater on an air-conditioning compressor is used to what?
Heat load
Boil the liquid refrigerant out ot the oil within the crankcase
SEER includes the energy used in the start-up and shut-down cycles
100

27. The evaporator is designed to remove what two types of heat?
Pistons
30 A
Pull a vacuum
Latent and sensible

28. What is the range for normal superheat and subcooling?
Negative
8-12 degrees F
The takeoff fitting
18 gauge

29. Does a package unit come from the factory pre-charged?
Over 800 degrees F
105 degrees F
Yes
TXV

30. What gauge is thermostat wire?
100 psig
Nominal-sized tubing
18 gauge
False

31. What are the three crafts normally associated with an air-conditioned installation?
Staples and tape
SEER includes the energy used in the start-up and shut-down cycles
Duct - electrical - and mechanical
TXV

32. If the suction pressure rises - what happens to the head pressure?
It also rises
Shorted winding - open winding - and grounded winding
It rises
400

33. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
In series
Indoor fan motor - outdoor fan motor - and the compressor
When it is above a conditioned space

34. How will too much refrigerant effect subcooling?
It will be high
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Duct with insulation on the inside
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

35. What do you use to connect square and rectangular ductboard together?
Individual return air systems and central return air systems
Side-by-side and over-and-under
ACR (air-conditioning refrigeration) tubing
S-clips and drives (cleats)

36. How is the high pressure switch wired with the low pressure switch?
To remove humidity and lower dry bulb temperature
Nominal-sized tubing
In parallel
Heat load

37. What sort of pressure will a pull-through evaporator have?
Potential relay and start capacitor
5 degrees
Negative
Before the vent

38. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
False
The suction line or the low-pressure side
By increasing the surface of the condenser coil

39. How are round ducts connected to one another?
Average feet per minute X area in square feet (H' x W'/144)
Infiltration and ventilation
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws

40. What is a package unit?
Heat loss
It will have a decrease in superheat
15 A
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

41. How much does a drain line need to drop per foot of length?

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42. 7' round duct has a ballpark cfm of what?
To remove humidity and lower dry bulb temperature
By increasing the surface of the condenser coil
150
30 A

43. How are the condenser coils different on a high-efficiency unit?
Indoor fan motor - outdoor fan motor - and the compressor
Potential relay and start capacitor
It also rises
They are larger

44. In what state is the refrigerant in the compressor?
Pi x radius squared
200
Vapor
100

45. Where is insulation used on copper tubing used for air-conditioning?
A dirty evaporator
The suction line or the low-pressure side
In parallel
Pi x radius squared

46. What are normal conditions - as defined by the ARI.
18 gauge
When it is a pull-through evaporator
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

47. 6' round duct has a ballpark cfm of what?
Outside of the male fitting
Duct - electrical - and mechanical
A piston type metering device
100

48. What type of air conditioning system must be charged using the superheat method?
Yes
A piston type metering device
Outside of the male fitting
Negative

49. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Over/under and side by side
Common
It will have a decrease in superheat
A piston type metering device

50. At what temperature does refrigerant condense in a standard-efficiency unit?
300
A dirty evaporator
400
30-35 degrees above ambient