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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?
Infiltration and ventilation
TXV
20 degrees F
A diffuser

2. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
45-55%
400
Vapor

3. If the rpm's are 1050 - how many poles does the motor have?
The takeoff fitting
In parallel
Nitrogen with a small amount of refrigerant
6

4. How many amps can 8 g wire handle?
8-12 degrees F
40 A
Stranded
2

5. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
100 psig
Yes
20 degrees above ambient

6. What kind of metering device do high-efficiency units usually use?
TXV
30 degrees F
In parallel
30 degrees F

7. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Btu/hr (output) / wattage (input)
100 psig
Over 800 degrees F
30 degrees F

8. What is it called when liquid refrigerant gets into the compressor?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
15% silphos
Slugging
2

9. What do you use to connect square and rectangular ductboard together?
Yes
It will be high
Individual return air systems and central return air systems
S-clips and drives (cleats)

10. What is used to measure static air pressure in ducts.
S-clips and drives (cleats)
TXV
Inclined manometer
Infiltration and ventilation

11. What are the two types of package units?
Side-by-side and over-and-under
100 psig
Before the vent
When it is a pull-through evaporator

12. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Pistons
True
100
5 degrees

13. What are the two basic duct connection configurations for package units supply and return air ducts?
140 degrees F
Over/under and side by side
High
Suction

14. What is lined duct?
Nominal-sized tubing
Stranded
Duct with insulation on the inside
Vapor

15. If pressure rises - what happens to the superheat?
Inside diameter (ID)
False
It rises
Heat loss

16. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
300
TXV
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

17. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
A dirty evaporator
A piston type metering device
200

18. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
True
Individual return air systems and central return air systems
A bypass duct or a dump zone

19. If the rpm's are 1050 - how many poles does the motor have?
6
Outside diameter (OD)
Side-by-side and over-and-under
By increasing the surface of the condenser coil

20. 10 SEER is classified as what kind of efficiency?
A swaging tool
They are physically larger
A piston type metering device
Standard

21. 10 SEER is classified as what kind of efficiency?
Outside diameter (OD)
Any amount
Standard
Yes

22. Pressure in ductwork is measured In what?
Yes
Below 800 degrees F
Inches of water column (in. WC)
45-55%

23. The crankcase heater on an air-conditioning compressor is used to what?
Yes
A swaging tool
Boil the liquid refrigerant out ot the oil within the crankcase
It will be high

24. The A/C size is calculated by what?
Heat load
100 psig
8-12 degrees F
Suction

25. What sort of pressure will a pull-through evaporator have?
30 degrees F
40 degrees F
8
Negative

26. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
20 A
To remove humidity and lower dry bulb temperature
A bypass duct or a dump zone
It will be high

27. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
Outside of the male fitting
A band 4 inches or more in width
Stranded

28. The compressor is cooled by liquid refrigerant. (True of False)
False
Pull a vacuum
A dirty evaporator
Slugging

29. How is ACR tubing sized?
Outside diameter (OD)
They are larger
Over/under and side by side
Inclined manometer

30. What is the typical pressure differance across a TXV?
100 psig
Heat loss
Infiltration and ventilation
Common

31. The load on the evaporater will effect which pressure?
Shorted winding - open winding - and grounded winding
Suction
On the common terminal
20 A

32. What type of air conditioning system must be charged using the superheat method?
Btu/hr (output) / wattage (input)
20 degrees F
A piston type metering device
Subtract ambient temperature from 100

33. How do you achieve high-efficiency?
Inclined manometer
By increasing the surface of the condenser coil
Shorted winding - open winding - and grounded winding
With 4' saddles

34. Where do you check the amps on a motor?
On the common terminal
12000
High
A dirty evaporator

35. What is a package unit?
Compressor
They are larger
Rise
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

36. How will too much refrigerant effect superheat?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Positive
Fiberglass
It will be low

37. How is insulation around a duct rated?
With an are rating
Stranded
TXV
Dehydrated with caps on each end

38. If the rpm's are 750 - how many poles does the motor have?
TXV
8
200
Potential relay and start capacitor

39. How many cfm per ton?
Below 800 degrees F
In parallel
Standard
400

40. When do you install a trap on a drain line?
Heat load
When it is a pull-through evaporator
15% silphos
30 A

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

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42. In what state is the refrigerant in the compressor?
Compressor
Pull a vacuum
Pi x radius squared
Vapor

43. When do you install a trap on a drain line?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
A band 4 inches or more in width
When it is a pull-through evaporator
Yes

44. 10' round duct has a ballpark cfm of what?
400
Dehydrated with caps on each end
SEER includes the energy used in the start-up and shut-down cycles
18 gauge

45. In what state is the refrigerant in the compressor?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
TXV
Vapor
30 degrees F

46. Where do you check the amps on a motor?
On the common terminal
Yes
Fiberglass
SEER includes the energy used in the start-up and shut-down cycles

47. How do you calculate cfm?

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48. What is the range for normal superheat and subcooling?
It will be high
8-12 degrees F
30 A
No

49. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
Yes
Before the vent
In series

50. What is considered normal operating conditions?
A dirty evaporator
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Vapor
6