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Residential Air Conditioning

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. A reciprocating compressor has what sort of moving parts?
8-12 degrees F
True
Pistons
Shorted winding - open winding - and grounded winding

2. How is insulation around a duct rated?
Stranded
With an are rating
2
Btu/hr (output) / wattage (input)

3. How will too much refrigerant effect subcooling?
True
It will be high
Subtract ambient temperature from 100
Any amount

4. How many cfm per ton?
400
TXV
When the system is under pressure
Any amount

5. How is nominal-sized tubing sized?
On the common terminal
Indoor fan motor - outdoor fan motor - and the compressor
Inside diameter (ID)
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

6. At what temperature does refrigerant condense in a standard-efficiency unit?
Duct with insulation on the inside
Potential relay and start capacitor
30-35 degrees above ambient
It rises

7. Will a dirty condenser cause a rise or fall in pressure?
100 psig
Compressor
Rise
Boil the liquid refrigerant out ot the oil within the crankcase

8. What kind of metering device do high-efficiency units usually use?
TXV
Individual return air systems and central return air systems
20 degrees F
Potential relay and start capacitor

9. What kind of refrigeratnts must be added in liquid form?
Duct with insulation on the inside
Blended refrigerants
Inclined manometer
On the common terminal

10. If the rpm's are 3450 - how many poles does the motor have?
Inclined manometer
Static pressure - velocity pressure - and total pressure
RLA/FLA x 5
2

11. At what temperature will soft solder melt?
Yes
Infiltration and ventilation
15 A
Below 800 degrees F

12. Do you need a trap on a push-through evaporator?
Nominal-sized tubing
Stranded
4
No

13. How do you achieve high-efficiency?
L-type
8-12 degrees F
By increasing the surface of the condenser coil
Over/under and side by side

14. Does a package unit come from the factory pre-charged?
1/4'
The takeoff fitting
15% silphos
Yes

15. What are the two types of blower drives?
Belt drive and direct drive
15% silphos
Static pressure - velocity pressure - and total pressure
Before the vent

16. What sort of pressure will a push-through evaporator have?
Btu/hr (output) / wattage (input)
200
Positive
20 A

17. At what temperature will soft solder melt?
ACR (air-conditioning refrigeration) tubing
Pistons
Below 800 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase

18. How many BTU's per ton?
300
12000
It also rises
100

19. What are normal conditions - as defined by the ARI.
Heat load
It also rises
Pull a vacuum
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

20. How do you calculate LRA?
45-55%
RLA/FLA x 5
Side-by-side and over-and-under
Indoor fan motor - outdoor fan motor - and the compressor

21. The load on the evaporater will effect which pressure?
45 degrees F
Shorted winding - open winding - and grounded winding
Suction
Yes

22. What is a package unit?
They are larger
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Yes
8-12 degrees F

23. Why are some ACR tubing lines insulated?
300
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Negative
Over/under and side by side

24. A reciprocating compressor has what sort of moving parts?
Staples and tape
Pistons
Pull a vacuum
TXV

25. How will too much refrigerant effect subcooling?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
25-ft or 50-ft
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It will be high

26. What do you use to connect square and rectangular ductboard together?
Standard
S-clips and drives (cleats)
Common
40 degrees F

27. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Shorted winding - open winding - and grounded winding
It will be low
In parallel
A bypass duct or a dump zone

28. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
They are physically larger
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
With a minimum of three evenly spaced self-tapping screws

29. Do you need a vent on a push-through evaporator?
400
The suction line or the low-pressure side
Yes
It rises

30. What do you use to connect square and rectangular ductboard together?
Suction
Side-by-side and over-and-under
S-clips and drives (cleats)
In parallel

31. At what temperature does refrigerant condense in a standard-efficiency unit?
140 degrees F
30-35 degrees above ambient
Stranded
Slugging

32. What are the three major power-consuming devices on an air-conditioning system?
Common
Indoor fan motor - outdoor fan motor - and the compressor
1/4'
Belt drive and direct drive

33. Where do you install a trap on a drain line?
With 4' saddles
When it is above a conditioned space
Any amount
Before the vent

34. How is the high pressure switch wired with the low pressure switch?
Slugging
Nitrogen with a small amount of refrigerant
TXV
In parallel

35. What sort of pressure will a pull-through evaporator have?
20 degrees F
A dirty evaporator
Fiberglass
Negative

36. What is the range for normal superheat and subcooling?
8-12 degrees F
20 A
Outside of the male fitting
In series

37. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
They are physically larger
With 4' saddles
True
Individual return air systems and central return air systems

38. Can refrigerant line sets be altered in length?
20 A
Yes
2
With a minimum of three evenly spaced self-tapping screws

39. What is the difference between SEER and EER?
Heat loss
TXV
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
SEER includes the energy used in the start-up and shut-down cycles

40. What is the design boiling point for most evaporator coils in residential air conditioning?
8-12 degrees F
40 degrees F
False
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

41. How is ACR tubing sized?
They are larger
Belt drive and direct drive
Outside diameter (OD)
SEER includes the energy used in the start-up and shut-down cycles

42. What kind of copper tubing is used for plumbing and heating applications?
25-ft or 50-ft
Nominal-sized tubing
Yes
Side-by-side and over-and-under

43. 9' round duct has a ballpark cfm of what?
15% silphos
300
25-ft or 50-ft
A swaging tool

44. What are the three pressures created by moving air in ductwork?
A bypass duct or a dump zone
1/4'
Nominal-sized tubing
Static pressure - velocity pressure - and total pressure

45. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
Static pressure - velocity pressure - and total pressure
Yes
18 gauge

46. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
They are physically larger
400
SEER includes the energy used in the start-up and shut-down cycles

47. How will too much refrigerant effect superheat?
Pistons
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It will be low
Infiltration and ventilation

48. 13 SEER is classified as what kind of efficiency?
Fiberglass
High
Stranded
L-type

49. 9' round duct has a ballpark cfm of what?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
300
45 degrees F
Indoor fan motor - outdoor fan motor - and the compressor

50. Do you need a vent on a push-through evaporator?
Yes
Nominal-sized tubing
Yes
Before the vent

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Residential Air Conditioning

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