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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 is the range for normal superheat and subcooling?
8-12 degrees F
Compressor
2
A bypass duct or a dump zone

2. What is the difference between SEER and EER?
Outside of the male fitting
Stranded
They are larger
SEER includes the energy used in the start-up and shut-down cycles

3. When do you install an auxillary drain pan?
When it is above a conditioned space
Duct - electrical - and mechanical
15% silphos
Inclined manometer

4. What kind of copper tubing is used for plumbing and heating applications?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
When it is above a conditioned space
Nominal-sized tubing
In series

5. How will too much refrigerant effect superheat?
It will be low
ACR (air-conditioning refrigeration) tubing
RLA/FLA x 5
With 4' saddles

6. If the rpm's are 1050 - how many poles does the motor have?
40 A
6
40 A
5 degrees

7. A reciprocating compressor has what sort of moving parts?
Before the vent
400
A swaging tool
Pistons

8. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
8-12 degrees F
To lower the amount of pressure drop through the coil
Rise
45-55%

9. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Yes
Subtract ambient temperature from 100
It will have a decrease in superheat
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

10. What do you use to connect square and rectangular ductboard together?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
S-clips and drives (cleats)
Rise
Indoor fan motor - outdoor fan motor - and the compressor

11. 7' round duct has a ballpark cfm of what?
150
Yes
Heat load
Fiberglass

12. Will a dirty condenser cause a rise or fall in pressure?
To remove humidity and lower dry bulb temperature
On the common terminal
1/4'
Rise

13. What are the two ways that fresh air enters a structure?
The suction line or the low-pressure side
Staples and tape
Infiltration and ventilation
40 degrees F

14. How many amps can 12 g wire handle?
Positive
45 degrees F
Vapor
20 A

15. If the suction pressure rises - what happens to the head pressure?
It also rises
Negative
Outside diameter (OD)
When it is a pull-through evaporator

16. The evaporator is designed to remove what two types of heat?
In series
When it is a pull-through evaporator
Latent and sensible
A bypass duct or a dump zone

17. The evaporator is designed to remove what two types of heat?
By increasing the surface of the condenser coil
Inclined manometer
Pistons
Latent and sensible

18. How do you calculate EER?
200
400
Btu/hr (output) / wattage (input)
By increasing the surface of the condenser coil

19. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
Nominal-sized tubing
400
Negative

20. What kind of metering device do high-efficiency units usually use?
Negative
TXV
8-12 degrees F
2

21. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
SEER includes the energy used in the start-up and shut-down cycles
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
L-type
Latent and sensible

22. If the suction pressure rises - what happens to the head pressure?
High
Inches of water column (in. WC)
It also rises
When it is above a conditioned space

23. What is the design boiling point for most evaporator coils in residential air conditioning?
With an are rating
40 degrees F
To remove humidity and lower dry bulb temperature
Yes

24. At what temperature does refrigerant condense in a standard-efficiency unit?
Inclined manometer
12000
40 degrees F
30-35 degrees above ambient

25. Do you need a trap on a pull-through evaporator?
Potential relay and start capacitor
Blended refrigerants
It also rises
Yes

26. What is considered normal operating conditions?
Individual return air systems and central return air systems
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
A dirty evaporator
Subtract ambient temperature from 100

27. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
Compressor
2
A dirty evaporator

28. Where do you check the amps on a motor?
On the common terminal
Outside diameter (OD)
Inside diameter (ID)
Duct with insulation on the inside

29. What component changes refrigerant from a low pressure gas to a high pressure gas?
With a minimum of three evenly spaced self-tapping screws
Compressor
A bypass duct or a dump zone
25-ft or 50-ft

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

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31. How is ACR tubing sized?
Yes
Outside diameter (OD)
2 minutes
Boil the liquid refrigerant out ot the oil within the crankcase

32. What do you use to check for leaks?
In parallel
Dehydrated with caps on each end
Nitrogen with a small amount of refrigerant
ACR (air-conditioning refrigeration) tubing

33. If the rpm's are 750 - how many poles does the motor have?
True
8
Vapor
40 degrees F

34. What tool is used to expand the diameter of soft copper tubing
Duct - electrical - and mechanical
Average feet per minute X area in square feet (H' x W'/144)
100 psig
A swaging tool

35. How do you calculate cfm?

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36. Does a package unit come from the factory pre-charged?
TXV
A swaging tool
Yes
High

37. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Indoor fan motor - outdoor fan motor - and the compressor
20 degrees F
Latent and sensible
Duct with insulation on the inside

38. What is used to measure static air pressure in ducts.
In parallel
Outside of the male fitting
20 A
Inclined manometer

39. What distributes supply air to a room in a structure?
A diffuser
To remove humidity and lower dry bulb temperature
Duct with insulation on the inside
200

40. How do you calculate EER?
Btu/hr (output) / wattage (input)
No
With an are rating
6

41. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
Inside diameter (ID)
Belt drive and direct drive
L-type

42. How are the condenser coils different on a high-efficiency unit?
Static pressure - velocity pressure - and total pressure
They are larger
Nominal-sized tubing
45-55%

43. What are the two types of package units?
Over 800 degrees F
45-55%
Side-by-side and over-and-under
With a minimum of three evenly spaced self-tapping screws

44. The crankcase heater on an air-conditioning compressor is used to what?
TXV
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
15% silphos
Boil the liquid refrigerant out ot the oil within the crankcase

45. What are the three major power-consuming devices on an air-conditioning system?
A band 4 inches or more in width
Indoor fan motor - outdoor fan motor - and the compressor
Nitrogen with a small amount of refrigerant
A dirty evaporator

46. When must a copper joint never be soldered or brazed?
When the system is under pressure
False
Any amount
Pistons

47. What are normal conditions - as defined by the ARI.
Yes
Below 800 degrees F
The takeoff fitting
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

48. What are the two ways that fresh air enters a structure?
A swaging tool
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Infiltration and ventilation
When the system is under pressure

49. The compressor is cooled by liquid refrigerant. (True of False)
400
Nitrogen with a small amount of refrigerant
False
40 degrees F

50. What are the two types of return air systems in residential installations?
On the common terminal
Individual return air systems and central return air systems
15% silphos
140 degrees F