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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 typical pressure differance across a TXV?
Any amount
It will have a decrease in superheat
40 degrees F
100 psig

2. How does ACR copper pipe come?
20 A
Dehydrated with caps on each end
To lower the amount of pressure drop through the coil
A piston type metering device

3. Does a package unit come from the factory pre-charged?
High
Before the vent
Yes
100 psig

4. Do you need a vent on a pull-through evaporator?
Slugging
Yes
Rise
Yes

5. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
High
True
It will have a decrease in superheat
140 degrees F

6. What do you use to connect square and rectangular ductboard together?
L-type
RLA/FLA x 5
40 degrees F
S-clips and drives (cleats)

7. Sections of duct board can be fastened together with what?
It will be high
Staples and tape
2 minutes
5 degrees

8. When do you install a trap on a drain line?
It will be low
When it is a pull-through evaporator
Average feet per minute X area in square feet (H' x W'/144)
Pistons

9. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
Standard
High
They are larger

10. What type of air conditioning system must be charged using the superheat method?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
A piston type metering device
RLA/FLA x 5
Positive

11. The evaporator is designed to remove what two types of heat?
S-clips and drives (cleats)
30 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Latent and sensible

12. 6' round duct has a ballpark cfm of what?
The suction line or the low-pressure side
TXV
The takeoff fitting
100

13. What are the two types of blower drives?
Slugging
45-55%
When the system is under pressure
Belt drive and direct drive

14. Pressure in ductwork is measured In what?
Shorted winding - open winding - and grounded winding
Inches of water column (in. WC)
400
Outside diameter (OD)

15. If the rpm's are 3450 - how many poles does the motor have?
On the common terminal
Inclined manometer
2
Shorted winding - open winding - and grounded winding

16. How do you calculate ballpark superheat?
4
Duct with insulation on the inside
Subtract ambient temperature from 100
To remove humidity and lower dry bulb temperature

17. What are the three crafts normally associated with an air-conditioned installation?
It also rises
Indoor fan motor - outdoor fan motor - and the compressor
Positive
Duct - electrical - and mechanical

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

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19. If the rpm's are 1050 - how many poles does the motor have?
Duct - electrical - and mechanical
Blended refrigerants
6
Outside diameter (OD)

20. What is the normal evaporator temperature?
8-12 degrees F
Shorted winding - open winding - and grounded winding
Yes
45 degrees F

21. What are normal conditions - as defined by the ARI.
40 A
5 degrees
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

22. If pressure rises - what happens to the superheat?
Negative
It rises
8-12 degrees F
When it is a pull-through evaporator

23. If the rpm's are 750 - how many poles does the motor have?
8
To remove humidity and lower dry bulb temperature
6
30 A

24. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
40 A
Vapor
Dehydrated with caps on each end

25. How do you calculate EER?
RLA/FLA x 5
20 A
When it is a pull-through evaporator
Btu/hr (output) / wattage (input)

26. 8' round duct has a ballpark cfm of what?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
200
Compressor
To remove humidity and lower dry bulb temperature

27. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
18 gauge
Vapor
L-type
12000

28. How are the condenser coils different on a high-efficiency unit?
To lower the amount of pressure drop through the coil
It will be low
They are larger
Before the vent

29. At what temperature will soft solder melt?
Yes
A bypass duct or a dump zone
It will be low
Below 800 degrees F

30. What sort of pressure will a push-through evaporator have?
In series
Blended refrigerants
Positive
30-35 degrees above ambient

31. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
In parallel
4
105 degrees F

32. What are the components of a hard-start kit?
30-35 degrees above ambient
Potential relay and start capacitor
A bypass duct or a dump zone
A piston type metering device

33. The furnace size is calculated by what?
20 degrees above ambient
5 degrees
Heat loss
TXV

34. What are the two types of return air systems in residential installations?
Boil the liquid refrigerant out ot the oil within the crankcase
Duct with insulation on the inside
Individual return air systems and central return air systems
Compressor

35. A reciprocating compressor has what sort of moving parts?
15 A
With an are rating
Pistons
15% silphos

36. The A/C size is calculated by what?
Heat load
SEER includes the energy used in the start-up and shut-down cycles
RLA/FLA x 5
12000

37. How is flexible duct supported?
15 A
Shorted winding - open winding - and grounded winding
It will have a decrease in superheat
A band 4 inches or more in width

38. If pressure rises - what happens to the superheat?
The takeoff fitting
Dehydrated with caps on each end
It rises
Yes

39. If the rpm's are 1750 - how many poles does the motor have?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
4
30 degrees F
Duct with insulation on the inside

40. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
Indoor fan motor - outdoor fan motor - and the compressor
It rises

41. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
1/4'
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Any amount

42. What distributes supply air to a room in a structure?
A diffuser
40 A
Yes
8

43. What is the normal evaporator temperature?
It rises
15% silphos
It will be low
45 degrees F

44. How will too much refrigerant effect superheat?
Rise
SEER includes the energy used in the start-up and shut-down cycles
It will be low
Boil the liquid refrigerant out ot the oil within the crankcase

45. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
When the system is under pressure
100
High

46. What distributes supply air to a room in a structure?
A diffuser
The suction line or the low-pressure side
Shorted winding - open winding - and grounded winding
They are physically larger

47. How is insulation around a duct rated?
15% silphos
With an are rating
100 psig
A band 4 inches or more in width

48. How will too much refrigerant effect subcooling?
400
Indoor fan motor - outdoor fan motor - and the compressor
It will be high
20 degrees F

49. What kind of copper tubing is used for refrigeration or air-conditioning applications?
False
140 degrees F
ACR (air-conditioning refrigeration) tubing
30-35 degrees above ambient

50. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
45-55%
No
1/4'
They are physically larger