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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. If the rpm's are 1750 - how many poles does the motor have?
4
40 degrees F
Blended refrigerants
TXV

2. Where is insulation used on copper tubing used for air-conditioning?
When the system is under pressure
25-ft or 50-ft
The suction line or the low-pressure side
Negative

3. A reciprocating compressor has what sort of moving parts?
Inches of water column (in. WC)
Pistons
4
RLA/FLA x 5

4. On what terminal do you check amperage?
The takeoff fitting
Common
Compressor
Below 800 degrees F

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

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6. How are the condenser coils different on a high-efficiency unit?
Average feet per minute X area in square feet (H' x W'/144)
They are larger
Positive
100 psig

7. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
RLA/FLA x 5
It also rises
Static pressure - velocity pressure - and total pressure

8. Do you need a vent on a push-through evaporator?
5 degrees
Yes
Outside of the male fitting
To remove humidity and lower dry bulb temperature

9. What is lined duct?
20 degrees above ambient
4
Suction
Duct with insulation on the inside

10. The fan switch opens at what temperature?
Infiltration and ventilation
105 degrees F
Pi x radius squared
The takeoff fitting

11. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
The takeoff fitting
A bypass duct or a dump zone
Over 800 degrees F

12. What are the two basic duct connection configurations for package units supply and return air ducts?
A diffuser
It will be low
Over/under and side by side
Standard

13. Most duct insulation is made of what?
Fiberglass
A bypass duct or a dump zone
True
Potential relay and start capacitor

14. How will too much refrigerant effect superheat?
Yes
It will be low
Negative
RLA/FLA x 5

15. How do you calculate LRA?
RLA/FLA x 5
A diffuser
15 A
15% silphos

16. What are the two types of blower drives?
Belt drive and direct drive
A dirty evaporator
30 degrees F
Yes

17. Where do you install a trap on a drain line?
Before the vent
20 degrees F
Vapor
200

18. Which is more efficient - a TXV or a fixed-orifice metering device?
When the system is under pressure
TXV
Potential relay and start capacitor
140 degrees F

19. How many amps can 10 g wire handle?
30 A
400
45 degrees F
20 degrees above ambient

20. Where do you check the amps on a motor?
When it is above a conditioned space
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Yes
On the common terminal

21. What is considered normal operating conditions?
15 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
TXV
4

22. What is used to measure static air pressure in ducts.
Inclined manometer
It will have a decrease in superheat
Inches of water column (in. WC)
5 degrees

23. What is lined duct?
It rises
Duct with insulation on the inside
By increasing the surface of the condenser coil
2

24. In what length rolls is soft copper tubing normally available?
A bypass duct or a dump zone
It will have a decrease in superheat
25-ft or 50-ft
2 minutes

25. What do you use to connect square and rectangular ductboard together?
1/4'
False
S-clips and drives (cleats)
Shorted winding - open winding - and grounded winding

26. Pressure in ductwork is measured In what?
Individual return air systems and central return air systems
Side-by-side and over-and-under
Inches of water column (in. WC)
A piston type metering device

27. What are the components of a hard-start kit?
100
ACR (air-conditioning refrigeration) tubing
15% silphos
Potential relay and start capacitor

28. 10 SEER is classified as what kind of efficiency?
Outside diameter (OD)
Outside of the male fitting
400
Standard

29. 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
A bypass duct or a dump zone
TXV
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

30. What is the difference between SEER and EER?
Heat load
SEER includes the energy used in the start-up and shut-down cycles
They are larger
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

31. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
Static pressure - velocity pressure - and total pressure
Pistons
With a minimum of three evenly spaced self-tapping screws

32. If the rpm's are 1750 - how many poles does the motor have?
SEER includes the energy used in the start-up and shut-down cycles
Individual return air systems and central return air systems
4
Yes

33. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
A piston type metering device
Outside diameter (OD)
45-55%
20 A

34. What is the typical pressure differance across a TXV?
25-ft or 50-ft
Subtract ambient temperature from 100
100 psig
140 degrees F

35. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
4
20 degrees F
A bypass duct or a dump zone
Any amount

36. What sort of pressure will a pull-through evaporator have?
150
Negative
To remove humidity and lower dry bulb temperature
On the common terminal

37. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
It rises
A band 4 inches or more in width
8

38. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
Belt drive and direct drive
100 psig
Potential relay and start capacitor

39. At what temperature will brazing melt?
ACR (air-conditioning refrigeration) tubing
Heat load
Over 800 degrees F
Standard

40. How do you calculate cfm?

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41. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
45-55%
400
With 4' saddles

42. When do you install a trap on a drain line?
200
30 A
When it is a pull-through evaporator
Slugging

43. Where do you apply flux when soldering?
Indoor fan motor - outdoor fan motor - and the compressor
Outside of the male fitting
Before the vent
Yes

44. What are the two types of package units?
Side-by-side and over-and-under
Static pressure - velocity pressure - and total pressure
Over/under and side by side
Before the vent

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

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46. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
In parallel
Inclined manometer
L-type
Suction

47. What kind of refrigeratnts must be added in liquid form?
S-clips and drives (cleats)
To lower the amount of pressure drop through the coil
The takeoff fitting
Blended refrigerants

48. At what temperature will brazing melt?
The suction line or the low-pressure side
TXV
The suction line or the low-pressure side
Over 800 degrees F

49. What are the three major power-consuming devices on an air-conditioning system?
Outside of the male fitting
Heat load
Indoor fan motor - outdoor fan motor - and the compressor
Average feet per minute X area in square feet (H' x W'/144)

50. What distributes supply air to a room in a structure?
On the common terminal
A diffuser
Indoor fan motor - outdoor fan motor - and the compressor
True