Test your basic knowledge |

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. If the rpm's are 750 - how many poles does the motor have?
The takeoff fitting
30-35 degrees above ambient
It also rises
8

2. Which type of wire can handle a higher ampacity?
Stranded
By increasing the surface of the condenser coil
Common
Negative

3. The evaporator is designed to remove what two types of heat?
Latent and sensible
Belt drive and direct drive
Pi x radius squared
20 A

4. Where do you install a trap on a drain line?
Vapor
Yes
Potential relay and start capacitor
Before the vent

5. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Outside of the male fitting
Any amount
A diffuser
Standard

6. 13 SEER is classified as what kind of efficiency?
It will be high
High
30 degrees F
30 A

7. 6' round duct has a ballpark cfm of what?
100
They are larger
18 gauge
150

8. How is flexible duct supported?
A band 4 inches or more in width
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It will be high
100

9. What are the three major power-consuming devices on an air-conditioning system?
Pistons
High
Indoor fan motor - outdoor fan motor - and the compressor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

10. How are the condenser coils different on a high-efficiency unit?
They are larger
By increasing the surface of the condenser coil
40 degrees F
With an are rating

11. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
A band 4 inches or more in width
They are physically larger
When the system is under pressure
Outside of the male fitting

12. Most duct insulation is made of what?
Fiberglass
300
To lower the amount of pressure drop through the coil
40 A

13. What are the two basic duct connection configurations for package units supply and return air ducts?
A swaging tool
Over/under and side by side
In series
200

14. The evaporator is designed to remove what two types of heat?
Latent and sensible
S-clips and drives (cleats)
Subtract ambient temperature from 100
A diffuser

15. How do you calculate cfm?

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16. How does ACR copper pipe come?
Staples and tape
Yes
15 A
Dehydrated with caps on each end

17. How many amps can 14 g wire handle?
Before the vent
15 A
Pistons
No

18. When do you install a trap on a drain line?
TXV
A swaging tool
When it is a pull-through evaporator
Subtract ambient temperature from 100

19. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
105 degrees F
A swaging tool
8

20. How do you calculate LRA?
It rises
150
When it is above a conditioned space
RLA/FLA x 5

21. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
When it is a pull-through evaporator
200
Fiberglass

22. How are round ducts connected to one another?
A band 4 inches or more in width
With a minimum of three evenly spaced self-tapping screws
40 degrees F
12000

23. What are the four materials used to make duct?
Nominal-sized tubing
A diffuser
40 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

24. What component changes refrigerant from a low pressure gas to a high pressure gas?
High
18 gauge
Nitrogen with a small amount of refrigerant
Compressor

25. How is the high pressure switch wired with the low pressure switch?
To lower the amount of pressure drop through the coil
In parallel
The suction line or the low-pressure side
To remove humidity and lower dry bulb temperature

26. How is nominal-sized tubing sized?
Inside diameter (ID)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
L-type
Duct - electrical - and mechanical

27. How does ACR copper pipe come?
Dehydrated with caps on each end
Inches of water column (in. WC)
Potential relay and start capacitor
A piston type metering device

28. How do you calculate EER?
Common
The takeoff fitting
45-55%
Btu/hr (output) / wattage (input)

29. Does a package unit come from the factory pre-charged?
S-clips and drives (cleats)
When it is above a conditioned space
Heat load
Yes

30. What percentage silver do you need to use for an are-410 system?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
150
15% silphos
30-35 degrees above ambient

31. What is the name of the fitting where the branch line leaves the duct?
Negative
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Yes
The takeoff fitting

32. What are the three crafts normally associated with an air-conditioned installation?
100 psig
Any amount
Duct - electrical - and mechanical
Yes

33. 8' round duct has a ballpark cfm of what?
45 degrees F
To lower the amount of pressure drop through the coil
30 A
200

34. What sort of pressure will a push-through evaporator have?
Yes
Positive
Heat load
Dehydrated with caps on each end

35. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
The suction line or the low-pressure side
30 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
A bypass duct or a dump zone

36. The furnace size is calculated by what?
8
Dehydrated with caps on each end
Heat loss
TXV

37. What do you use to connect square and rectangular ductboard together?
Yes
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
S-clips and drives (cleats)
It will be low

38. What is the name of the fitting where the branch line leaves the duct?
Yes
A bypass duct or a dump zone
The takeoff fitting
Boil the liquid refrigerant out ot the oil within the crankcase

39. The fan switch closes at what temperature?
On the common terminal
Standard
Yes
140 degrees F

40. Why are some ACR tubing lines insulated?
100 psig
It also rises
Individual return air systems and central return air systems
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

41. When must a copper joint never be soldered or brazed?
Latent and sensible
TXV
When the system is under pressure
Staples and tape

42. Can refrigerant line sets be altered in length?
Any amount
Over 800 degrees F
The suction line or the low-pressure side
Yes

43. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Dehydrated with caps on each end
With 4' saddles
30-35 degrees above ambient

44. Will a dirty condenser cause a rise or fall in pressure?
Yes
Rise
A band 4 inches or more in width
Common

45. What are the components of a hard-start kit?
12000
High
105 degrees F
Potential relay and start capacitor

46. 10' round duct has a ballpark cfm of what?
RLA/FLA x 5
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
400
30-35 degrees above ambient

47. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
Staples and tape
Potential relay and start capacitor
No

48. How long should you leave a system off once you kill power before restarting it?
With 4' saddles
Below 800 degrees F
Individual return air systems and central return air systems
2 minutes

49. How many amps can 8 g wire handle?
Common
When the system is under pressure
To remove humidity and lower dry bulb temperature
40 A

50. Do you need a vent on a push-through evaporator?
Yes
To remove humidity and lower dry bulb temperature
Below 800 degrees F
Shorted winding - open winding - and grounded winding