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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 components of a hard-start kit?
No
A swaging tool
Potential relay and start capacitor
Below 800 degrees F

2. What do you use to check for leaks?
Blended refrigerants
105 degrees F
Nitrogen with a small amount of refrigerant
1/4'

3. What type of air conditioning system must be charged using the superheat method?
30-35 degrees above ambient
Any amount
A piston type metering device
To lower the amount of pressure drop through the coil

4. When do you install a trap on a drain line?
When it is a pull-through evaporator
15 A
8
When it is above a conditioned space

5. How many BTU's per ton?
TXV
True
Rise
12000

6. What distributes supply air to a room in a structure?
15% silphos
On the common terminal
L-type
A diffuser

7. What sort of pressure will a pull-through evaporator have?
Slugging
100
On the common terminal
Negative

8. What do you use to connect square and rectangular ductboard together?
It will have a decrease in superheat
Yes
Indoor fan motor - outdoor fan motor - and the compressor
S-clips and drives (cleats)

9. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Potential relay and start capacitor
Yes
Any amount
It will be low

10. Where do you check the amps on a motor?
20 degrees above ambient
On the common terminal
Pi x radius squared
25-ft or 50-ft

11. What is considered normal operating conditions?
Rise
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Over/under and side by side
Indoor fan motor - outdoor fan motor - and the compressor

12. 8' round duct has a ballpark cfm of what?
On the common terminal
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
200
L-type

13. When do you install an auxillary drain pan?
When it is above a conditioned space
Below 800 degrees F
300
2

14. When do you install an auxillary drain pan?
40 degrees F
Potential relay and start capacitor
45-55%
When it is above a conditioned space

15. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
15 A
In series
A bypass duct or a dump zone
L-type

16. What is used to measure static air pressure in ducts.
Inclined manometer
It rises
It will be high
15 A

17. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
The takeoff fitting
Stranded
30 degrees F

18. What can cause a decrease in suction pressure on an air-conditioning system?
S-clips and drives (cleats)
A dirty evaporator
With 4' saddles
In series

19. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
Boil the liquid refrigerant out ot the oil within the crankcase
400
15% silphos

20. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
45 degrees F
A bypass duct or a dump zone
45-55%

21. Can refrigerant line sets be altered in length?
20 degrees F
Yes
4
Pull a vacuum

22. Where is insulation used on copper tubing used for air-conditioning?
15% silphos
The suction line or the low-pressure side
Yes
12000

23. In what length rolls is soft copper tubing normally available?
Inclined manometer
25-ft or 50-ft
Yes
4

24. What are the two types of return air systems in residential installations?
8-12 degrees F
Yes
15 A
Individual return air systems and central return air systems

25. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
RLA/FLA x 5
Below 800 degrees F
A piston type metering device

26. What are the two types of return air systems in residential installations?
The suction line or the low-pressure side
Fiberglass
Individual return air systems and central return air systems
RLA/FLA x 5

27. A reciprocating compressor has what sort of moving parts?
40 A
It will have a decrease in superheat
Pistons
True

28. How are round ducts connected to one another?
Negative
Belt drive and direct drive
No
With a minimum of three evenly spaced self-tapping screws

29. Which type of wire can handle a higher ampacity?
Belt drive and direct drive
Heat load
105 degrees F
Stranded

30. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
15 A
Compressor
40 A

31. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Boil the liquid refrigerant out ot the oil within the crankcase
A bypass duct or a dump zone
Shorted winding - open winding - and grounded winding
Nitrogen with a small amount of refrigerant

32. How many cfm per ton?
Side-by-side and over-and-under
Below 800 degrees F
400
No

33. 9' round duct has a ballpark cfm of what?
In parallel
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
300
Yes

34. What do you use to check for leaks?
Pull a vacuum
With an are rating
25-ft or 50-ft
Nitrogen with a small amount of refrigerant

35. Most duct insulation is made of what?
Compressor
Fiberglass
Inclined manometer
Compressor

36. The crankcase heater on an air-conditioning compressor is used to what?
TXV
Before the vent
Nitrogen with a small amount of refrigerant
Boil the liquid refrigerant out ot the oil within the crankcase

37. Will a dirty condenser cause a rise or fall in pressure?
Rise
It will be high
100 psig
In parallel

38. How many amps can 12 g wire handle?
30-35 degrees above ambient
20 A
40 degrees F
SEER includes the energy used in the start-up and shut-down cycles

39. How long should you leave a system off once you kill power before restarting it?
TXV
30 degrees F
2 minutes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

40. What is the normal evaporator temperature?
45 degrees F
With 4' saddles
Inclined manometer
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

41. If the suction pressure rises - what happens to the head pressure?
Latent and sensible
105 degrees F
Common
It also rises

42. How is insulation around a duct rated?
Subtract ambient temperature from 100
Inches of water column (in. WC)
Heat loss
With an are rating

43. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Yes
Btu/hr (output) / wattage (input)
Heat load

44. Can refrigerant line sets be altered in length?
Dehydrated with caps on each end
Yes
20 degrees above ambient
SEER includes the energy used in the start-up and shut-down cycles

45. How do you calculate cfm?

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46. If the rpm's are 1050 - how many poles does the motor have?
It will be high
6
Belt drive and direct drive
They are larger

47. Do you need a trap on a push-through evaporator?
Pull a vacuum
Average feet per minute X area in square feet (H' x W'/144)
No
Side-by-side and over-and-under

48. How will too much refrigerant effect superheat?
Slugging
It will be low
It also rises
20 A

49. Does a package unit come from the factory pre-charged?
Yes
ACR (air-conditioning refrigeration) tubing
105 degrees F
When it is a pull-through evaporator

50. When must a copper joint never be soldered or brazed?
It will have a decrease in superheat
When the system is under pressure
Dehydrated with caps on each end
Below 800 degrees F