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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. How do you achieve high-efficiency?
On the common terminal
By increasing the surface of the condenser coil
Inches of water column (in. WC)
A dirty evaporator

2. What type of air conditioning system must be charged using the superheat method?
A diffuser
105 degrees F
They are larger
A piston type metering device

3. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
With a minimum of three evenly spaced self-tapping screws
Any amount
Infiltration and ventilation
Latent and sensible

4. Does a package unit come from the factory pre-charged?
105 degrees F
400
Common
Yes

5. If the suction pressure rises - what happens to the head pressure?
Stranded
8
It also rises
30 A

6. Do you need a trap on a push-through evaporator?
15 A
Inclined manometer
No
45 degrees F

7. What component changes refrigerant from a low pressure gas to a high pressure gas?
Slugging
200
Compressor
Suction

8. What is the normal evaporator temperature?
Infiltration and ventilation
45 degrees F
Common
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

9. 13 SEER is classified as what kind of efficiency?
Inside diameter (ID)
High
18 gauge
The takeoff fitting

10. What is the range for normal superheat and subcooling?
TXV
140 degrees F
400
8-12 degrees F

11. What is a package unit?
Btu/hr (output) / wattage (input)
Blended refrigerants
8
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

12. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
It also rises
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Pi x radius squared

13. What kind of refrigeratnts must be added in liquid form?
20 degrees F
Blended refrigerants
Subtract ambient temperature from 100
20 degrees above ambient

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

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15. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Yes
40 degrees F
Btu/hr (output) / wattage (input)
A diffuser

16. What gauge is thermostat wire?
Yes
18 gauge
20 A
With 4' saddles

17. What are the two types of package units?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Side-by-side and over-and-under
By increasing the surface of the condenser coil
8

18. How are the condenser coils different on a high-efficiency unit?
Yes
It will be high
18 gauge
They are larger

19. What do you use to connect square and rectangular ductboard together?
TXV
True
S-clips and drives (cleats)
A dirty evaporator

20. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A piston type metering device
A bypass duct or a dump zone
Static pressure - velocity pressure - and total pressure
Individual return air systems and central return air systems

21. How long should you leave a system off once you kill power before restarting it?
Duct - electrical - and mechanical
30-35 degrees above ambient
2 minutes
In series

22. What are the two types of package units?
Individual return air systems and central return air systems
Side-by-side and over-and-under
Outside diameter (OD)
By increasing the surface of the condenser coil

23. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
On the common terminal
A band 4 inches or more in width
Yes

24. How are round ducts connected to one another?
On the common terminal
With a minimum of three evenly spaced self-tapping screws
15% silphos
Over 800 degrees F

25. Can refrigerant line sets be altered in length?
Yes
A bypass duct or a dump zone
On the common terminal
140 degrees F

26. 7' round duct has a ballpark cfm of what?
Boil the liquid refrigerant out ot the oil within the crankcase
Btu/hr (output) / wattage (input)
150
Yes

27. If the rpm's are 3450 - how many poles does the motor have?
L-type
They are physically larger
5 degrees
2

28. Most duct insulation is made of what?
45 degrees F
Fiberglass
150
Shorted winding - open winding - and grounded winding

29. How do you calculate ballpark superheat?
2 minutes
S-clips and drives (cleats)
Subtract ambient temperature from 100
With 4' saddles

30. 8' round duct has a ballpark cfm of what?
When it is above a conditioned space
Yes
20 degrees F
200

31. What is the design boiling point for most evaporator coils in residential air conditioning?
2
40 degrees F
18 gauge
SEER includes the energy used in the start-up and shut-down cycles

32. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
Belt drive and direct drive
Inches of water column (in. WC)
8

33. What are the three crafts normally associated with an air-conditioned installation?
Vapor
15% silphos
Duct - electrical - and mechanical
Nitrogen with a small amount of refrigerant

34. If the rpm's are 1050 - how many poles does the motor have?
Rise
False
A dirty evaporator
6

35. How long should you leave a system off once you kill power before restarting it?
400
2 minutes
When it is above a conditioned space
In series

36. Most duct insulation is made of what?
On the common terminal
Fiberglass
20 A
Yes

37. What is it called when liquid refrigerant gets into the compressor?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Slugging
200
ACR (air-conditioning refrigeration) tubing

38. How many amps can 10 g wire handle?
30 A
A dirty evaporator
Infiltration and ventilation
A diffuser

39. The fan switch opens at what temperature?
Staples and tape
Duct with insulation on the inside
Blended refrigerants
105 degrees F

40. What is lined duct?
A diffuser
100
Over/under and side by side
Duct with insulation on the inside

41. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
A swaging tool
40 A
They are physically larger
Any amount

42. How many amps can 14 g wire handle?
Side-by-side and over-and-under
30-35 degrees above ambient
S-clips and drives (cleats)
15 A

43. What is the design boiling point for most evaporator coils in residential air conditioning?
20 A
40 A
40 degrees F
Negative

44. What is the difference between SEER and EER?
Dehydrated with caps on each end
When it is above a conditioned space
It will be low
SEER includes the energy used in the start-up and shut-down cycles

45. What tool is used to expand the diameter of soft copper tubing
It will be high
Standard
140 degrees F
A swaging tool

46. The A/C size is calculated by what?
False
40 degrees F
Any amount
Heat load

47. How do you calculate cfm?

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48. Superheat should never be below how many degrees
Yes
5 degrees
40 degrees F
Yes

49. What kind of copper tubing is used for plumbing and heating applications?
Negative
RLA/FLA x 5
When it is a pull-through evaporator
Nominal-sized tubing

50. If the rpm's are 1050 - how many poles does the motor have?
1/4'
40 A
Yes
6