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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 tool is used to expand the diameter of soft copper tubing
Duct - electrical - and mechanical
A swaging tool
Shorted winding - open winding - and grounded winding
Pistons

2. What are the components of a hard-start kit?
Subtract ambient temperature from 100
Potential relay and start capacitor
Pistons
2 minutes

3. How do you calculate the area of a circle?
20 degrees above ambient
No
Pi x radius squared
They are larger

4. Where do you check the amps on a motor?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
They are larger
The suction line or the low-pressure side
On the common terminal

5. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
25-ft or 50-ft
100
150

6. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
30-35 degrees above ambient
Pull a vacuum
A dirty evaporator

7. What gauge is thermostat wire?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
18 gauge
Inches of water column (in. WC)
15% silphos

8. Does a package unit come from the factory pre-charged?
Yes
Below 800 degrees F
20 A
Stranded

9. How is ACR tubing sized?
30-35 degrees above ambient
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Outside diameter (OD)
Belt drive and direct drive

10. How many cfm per ton?
Compressor
5 degrees
400
No

11. How is the high pressure switch wired with the low pressure switch?
A diffuser
In parallel
Static pressure - velocity pressure - and total pressure
It will be low

12. Sections of duct board can be fastened together with what?
45-55%
Staples and tape
Duct with insulation on the inside
40 degrees F

13. If pressure rises - what happens to the superheat?
40 degrees F
Yes
It rises
Over 800 degrees F

14. How is flexible duct supported?
A diffuser
18 gauge
A band 4 inches or more in width
A swaging tool

15. Do you need a vent on a pull-through evaporator?
TXV
4
Yes
40 A

16. What are the four materials used to make duct?
Nominal-sized tubing
150
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
On the common terminal

17. Do you need a vent on a push-through evaporator?
Rise
They are larger
5 degrees
Yes

18. At what temperature will brazing melt?
100
To lower the amount of pressure drop through the coil
12000
Over 800 degrees F

19. How do you calculate EER?
4
Average feet per minute X area in square feet (H' x W'/144)
Heat load
Btu/hr (output) / wattage (input)

20. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Inches of water column (in. WC)
30-35 degrees above ambient
Potential relay and start capacitor

21. What are the two types of blower drives?
Yes
Stranded
Belt drive and direct drive
Heat loss

22. How is flexible duct supported?
45-55%
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
A band 4 inches or more in width

23. Does a package unit come from the factory pre-charged?
Yes
Pi x radius squared
20 degrees above ambient
45 degrees F

24. What kind of copper tubing is used for refrigeration or air-conditioning applications?
With an are rating
Shorted winding - open winding - and grounded winding
ACR (air-conditioning refrigeration) tubing
30 A

25. How is insulation around a duct rated?
With an are rating
Latent and sensible
Pi x radius squared
30 A

26. What is lined duct?
When it is a pull-through evaporator
Heat load
18 gauge
Duct with insulation on the inside

27. How do you calculate LRA?
The suction line or the low-pressure side
200
RLA/FLA x 5
Inches of water column (in. WC)

28. What is it called when liquid refrigerant gets into the compressor?
Positive
15 A
A swaging tool
Slugging

29. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
It rises
400
A piston type metering device

30. How will too much refrigerant effect subcooling?
20 degrees F
It will be high
The takeoff fitting
By increasing the surface of the condenser coil

31. When do you install a trap on a drain line?
When it is a pull-through evaporator
High
5 degrees
400

32. The furnace size is calculated by what?
12000
Before the vent
Heat loss
Below 800 degrees F

33. If the rpm's are 750 - how many poles does the motor have?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
45 degrees F
The suction line or the low-pressure side
8

34. What are the two types of blower drives?
1/4'
SEER includes the energy used in the start-up and shut-down cycles
Belt drive and direct drive
By increasing the surface of the condenser coil

35. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Average feet per minute X area in square feet (H' x W'/144)
Slugging
Yes
A bypass duct or a dump zone

36. If pressure rises - what happens to the superheat?
It rises
Negative
Yes
Any amount

37. How is insulation around a duct rated?
400
With an are rating
SEER includes the energy used in the start-up and shut-down cycles
Outside of the male fitting

38. What is the design boiling point for most evaporator coils in residential air conditioning?
Positive
Average feet per minute X area in square feet (H' x W'/144)
It will be low
40 degrees F

39. What are the three ways a motor can fail electrically?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It will have a decrease in superheat
400
Shorted winding - open winding - and grounded winding

40. The crankcase heater on an air-conditioning compressor is used to what?
Standard
On the common terminal
Boil the liquid refrigerant out ot the oil within the crankcase
30-35 degrees above ambient

41. On what terminal do you check amperage?
20 degrees F
Common
Yes
Over/under and side by side

42. Where do you check the amps on a motor?
Positive
Individual return air systems and central return air systems
Duct - electrical - and mechanical
On the common terminal

43. How will too much refrigerant effect superheat?
Outside of the male fitting
Nitrogen with a small amount of refrigerant
It will be low
False

44. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
The suction line or the low-pressure side
2
Btu/hr (output) / wattage (input)

45. What do you use to connect square and rectangular ductboard together?
To lower the amount of pressure drop through the coil
S-clips and drives (cleats)
Yes
When it is above a conditioned space

46. Will a dirty condenser cause a rise or fall in pressure?
False
45 degrees F
SEER includes the energy used in the start-up and shut-down cycles
Rise

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

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48. 8' round duct has a ballpark cfm of what?
Yes
Inclined manometer
200
Pi x radius squared

49. The load on the evaporater will effect which pressure?
4
Suction
To remove humidity and lower dry bulb temperature
L-type

50. What kind of metering device do high-efficiency units usually use?
A bypass duct or a dump zone
It will be high
TXV
140 degrees F