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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 standard weight copper tubing is most often used in the heating and air-conditioning industry?
Compressor
20 degrees above ambient
It also rises
L-type

2. The A/C size is calculated by what?
Latent and sensible
Heat load
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Stranded

3. The load on the evaporater will effect which pressure?
By increasing the surface of the condenser coil
Suction
Negative
4

4. Do you need a vent on a push-through evaporator?
No
Dehydrated with caps on each end
Yes
40 degrees F

5. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
Positive
6
When it is a pull-through evaporator

6. Which is more efficient - a TXV or a fixed-orifice metering device?
Latent and sensible
When it is above a conditioned space
Yes
TXV

7. How is flexible duct supported?
Boil the liquid refrigerant out ot the oil within the crankcase
Duct - electrical - and mechanical
45 degrees F
A band 4 inches or more in width

8. The crankcase heater on an air-conditioning compressor is used to what?
1/4'
It will have a decrease in superheat
Boil the liquid refrigerant out ot the oil within the crankcase
By increasing the surface of the condenser coil

9. When do you install a trap on a drain line?
L-type
RLA/FLA x 5
They are larger
When it is a pull-through evaporator

10. What can cause a decrease in suction pressure on an air-conditioning system?
Yes
105 degrees F
When it is above a conditioned space
A dirty evaporator

11. How do you calculate cfm?

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12. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
20 degrees above ambient
It also rises
100 psig

13. What is a package unit?
Pistons
Duct with insulation on the inside
Rise
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

14. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
15% silphos
8-12 degrees F
A band 4 inches or more in width

15. How many amps can 10 g wire handle?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
They are physically larger
RLA/FLA x 5
30 A

16. How will too much refrigerant effect subcooling?
It will be high
40 degrees F
It will have a decrease in superheat
Pistons

17. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Duct with insulation on the inside
In series
Suction
True

18. Pressure in ductwork is measured In what?
140 degrees F
Inches of water column (in. WC)
They are physically larger
Inclined manometer

19. The furnace size is calculated by what?
Suction
Heat loss
5 degrees
TXV

20. What tool is used to expand the diameter of soft copper tubing
A swaging tool
15% silphos
Any amount
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?
2 minutes
Latent and sensible
Fiberglass
Inches of water column (in. WC)

22. A reciprocating compressor has what sort of moving parts?
Heat load
30 A
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Pistons

23. How do you calculate cfm?

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

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25. The evaporator is designed to remove what two types of heat?
Staples and tape
Latent and sensible
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Pull a vacuum

26. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
20 A
It will have a decrease in superheat
Yes

27. 10' round duct has a ballpark cfm of what?
400
Pistons
30-35 degrees above ambient
Inclined manometer

28. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
L-type
Btu/hr (output) / wattage (input)
Blended refrigerants
45-55%

29. What sort of pressure will a push-through evaporator have?
Positive
Pull a vacuum
It will have a decrease in superheat
A piston type metering device

30. What is the typical pressure differance across a TXV?
100 psig
A band 4 inches or more in width
It rises
30-35 degrees above ambient

31. How does ACR copper pipe come?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Dehydrated with caps on each end
It will be high
L-type

32. If the suction pressure rises - what happens to the head pressure?
Vapor
5 degrees
With an are rating
It also rises

33. Where is insulation used on copper tubing used for air-conditioning?
300
The suction line or the low-pressure side
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
400

34. The load on the evaporater will effect which pressure?
Indoor fan motor - outdoor fan motor - and the compressor
When it is a pull-through evaporator
It will be high
Suction

35. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
5 degrees
45 degrees F
Any amount
12000

36. The fan switch closes at what temperature?
40 A
Static pressure - velocity pressure - and total pressure
8
140 degrees F

37. What are the three crafts normally associated with an air-conditioned installation?
8-12 degrees F
15 A
Duct - electrical - and mechanical
Belt drive and direct drive

38. How many amps can 12 g wire handle?
A swaging tool
Over 800 degrees F
SEER includes the energy used in the start-up and shut-down cycles
20 A

39. If the suction pressure rises - what happens to the head pressure?
45-55%
Inches of water column (in. WC)
Shorted winding - open winding - and grounded winding
It also rises

40. 13 SEER is classified as what kind of efficiency?
A piston type metering device
High
No
Btu/hr (output) / wattage (input)

41. How many amps can 12 g wire handle?
Outside of the male fitting
Boil the liquid refrigerant out ot the oil within the crankcase
20 A
Belt drive and direct drive

42. When do you install an auxillary drain pan?
Vapor
20 degrees F
The takeoff fitting
When it is above a conditioned space

43. At what temperature will soft solder melt?
20 degrees above ambient
Below 800 degrees F
Heat loss
True

44. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
A bypass duct or a dump zone
30 degrees F
1/4'

45. Will a dirty condenser cause a rise or fall in pressure?
Yes
Rise
Outside of the male fitting
Common

46. Which type of wire can handle a higher ampacity?
When the system is under pressure
Pistons
Stranded
5 degrees

47. If the rpm's are 1050 - how many poles does the motor have?
Nitrogen with a small amount of refrigerant
2
6
Belt drive and direct drive

48. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
Latent and sensible
SEER includes the energy used in the start-up and shut-down cycles
8

49. What kind of metering device do high-efficiency units usually use?
It also rises
It will have a decrease in superheat
20 degrees above ambient
TXV

50. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Subtract ambient temperature from 100
45-55%
6
RLA/FLA x 5