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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. 10' round duct has a ballpark cfm of what?
8-12 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
200
400

2. A reciprocating compressor has what sort of moving parts?
Pistons
Yes
400
20 degrees above ambient

3. What is used to measure static air pressure in ducts.
Yes
To lower the amount of pressure drop through the coil
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Inclined manometer

4. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
Yes
Heat load
Belt drive and direct drive

5. What do you do after you braze a system?
Subtract ambient temperature from 100
A piston type metering device
Pi x radius squared
Pull a vacuum

6. What kind of metering device do high-efficiency units usually use?
Potential relay and start capacitor
8-12 degrees F
With a minimum of three evenly spaced self-tapping screws
TXV

7. Where do you install a trap on a drain line?
To lower the amount of pressure drop through the coil
Before the vent
TXV
Potential relay and start capacitor

8. What are the two types of return air systems in residential installations?
Yes
Yes
Individual return air systems and central return air systems
A band 4 inches or more in width

9. 10 SEER is classified as what kind of efficiency?
15 A
Dehydrated with caps on each end
Subtract ambient temperature from 100
Standard

10. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
SEER includes the energy used in the start-up and shut-down cycles
25-ft or 50-ft
2 minutes

11. What do you use to check for leaks?
A dirty evaporator
It will be high
Over 800 degrees F
Nitrogen with a small amount of refrigerant

12. What sort of pressure will a pull-through evaporator have?
Negative
With an are rating
2
The takeoff fitting

13. At what temperature does refrigerant condense in a standard-efficiency unit?
Pi x radius squared
30-35 degrees above ambient
Over 800 degrees F
Yes

14. Most duct insulation is made of what?
Fiberglass
It also rises
Vapor
When the system is under pressure

15. 6' round duct has a ballpark cfm of what?
Individual return air systems and central return air systems
100 psig
1/4'
100

16. What are the two functions of the air-conditioning system?
Potential relay and start capacitor
To remove humidity and lower dry bulb temperature
By increasing the surface of the condenser coil
12000

17. What component changes refrigerant from a low pressure gas to a high pressure gas?
Yes
S-clips and drives (cleats)
Compressor
Rise

18. Do you need a trap on a push-through evaporator?
Negative
The suction line or the low-pressure side
No
Subtract ambient temperature from 100

19. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
To lower the amount of pressure drop through the coil
2 minutes
Slugging
L-type

20. What is lined duct?
Any amount
A dirty evaporator
Duct with insulation on the inside
Outside of the male fitting

21. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
20 degrees above ambient
30 degrees F
6
105 degrees F

22. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
On the common terminal
A bypass duct or a dump zone
In parallel
Stranded

23. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Latent and sensible
25-ft or 50-ft
It also rises
They are physically larger

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

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25. 13 SEER is classified as what kind of efficiency?
High
105 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
SEER includes the energy used in the start-up and shut-down cycles

26. How will too much refrigerant effect subcooling?
Nitrogen with a small amount of refrigerant
It will be high
Positive
200

27. What gauge is thermostat wire?
A swaging tool
8
18 gauge
It will be low

28. In what length rolls is soft copper tubing normally available?
1/4'
25-ft or 50-ft
Individual return air systems and central return air systems
Heat loss

29. The evaporator is designed to remove what two types of heat?
Yes
Pull a vacuum
2
Latent and sensible

30. What type of air conditioning system must be charged using the superheat method?
No
A piston type metering device
False
Yes

31. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
TXV
Heat loss
A piston type metering device

32. When do you install a trap on a drain line?
When the system is under pressure
When it is a pull-through evaporator
Nominal-sized tubing
Below 800 degrees F

33. How many amps can 14 g wire handle?
It will be high
15 A
20 degrees above ambient
On the common terminal

34. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
4
200
Before the vent

35. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
Yes
Below 800 degrees F
A bypass duct or a dump zone

36. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
6
When it is a pull-through evaporator
A piston type metering device

37. What is the design boiling point for most evaporator coils in residential air conditioning?
Any amount
RLA/FLA x 5
40 degrees F
2 minutes

38. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
40 A
To remove humidity and lower dry bulb temperature
45-55%

39. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
Btu/hr (output) / wattage (input)
15% silphos
Boil the liquid refrigerant out ot the oil within the crankcase

40. What are the three crafts normally associated with an air-conditioned installation?
Staples and tape
20 A
20 degrees above ambient
Duct - electrical - and mechanical

41. When do you install an auxillary drain pan?
When it is above a conditioned space
By increasing the surface of the condenser coil
8-12 degrees F
When the system is under pressure

42. How will too much refrigerant effect superheat?
15% silphos
Heat loss
When it is a pull-through evaporator
It will be low

43. What is considered normal operating conditions?
Individual return air systems and central return air systems
High
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Fiberglass

44. 8' round duct has a ballpark cfm of what?
100
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Yes
200

45. How do you calculate the area of a circle?
Inclined manometer
Indoor fan motor - outdoor fan motor - and the compressor
Pi x radius squared
In parallel

46. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
40 A
By increasing the surface of the condenser coil
45-55%

47. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
RLA/FLA x 5
A bypass duct or a dump zone
When it is above a conditioned space

48. What are the components of a hard-start kit?
Potential relay and start capacitor
With a minimum of three evenly spaced self-tapping screws
400
100

49. Can refrigerant line sets be altered in length?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Indoor fan motor - outdoor fan motor - and the compressor
Yes
A dirty evaporator

50. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
By increasing the surface of the condenser coil
Nominal-sized tubing
High