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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 are the two types of package units?
It will be low
Nitrogen with a small amount of refrigerant
Outside diameter (OD)
Side-by-side and over-and-under

2. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Pi x radius squared
Infiltration and ventilation
True
The suction line or the low-pressure side

3. 10 SEER is classified as what kind of efficiency?
Indoor fan motor - outdoor fan motor - and the compressor
Standard
When it is above a conditioned space
40 degrees F

4. What are the two types of package units?
Side-by-side and over-and-under
With an are rating
105 degrees F
Pi x radius squared

5. How many cfm per ton?
2 minutes
A bypass duct or a dump zone
Pi x radius squared
400

6. 13 SEER is classified as what kind of efficiency?
A diffuser
SEER includes the energy used in the start-up and shut-down cycles
A bypass duct or a dump zone
High

7. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Heat loss
30 A

8. How do you calculate LRA?
They are larger
45 degrees F
RLA/FLA x 5
Any amount

9. 7' round duct has a ballpark cfm of what?
Pi x radius squared
2 minutes
Standard
150

10. What are the two functions of the air-conditioning system?
Btu/hr (output) / wattage (input)
Shorted winding - open winding - and grounded winding
Over 800 degrees F
To remove humidity and lower dry bulb temperature

11. What is a package unit?
Stranded
Staples and tape
25-ft or 50-ft
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

12. The fan switch opens at what temperature?
105 degrees F
A band 4 inches or more in width
TXV
Duct with insulation on the inside

13. How many amps can 8 g wire handle?
40 A
Outside diameter (OD)
RLA/FLA x 5
Average feet per minute X area in square feet (H' x W'/144)

14. When do you install an auxillary drain pan?
Yes
Pistons
It will be high
When it is above a conditioned space

15. Pressure in ductwork is measured In what?
Yes
They are physically larger
100 psig
Inches of water column (in. WC)

16. If the rpm's are 750 - how many poles does the motor have?
8
40 degrees F
Below 800 degrees F
Stranded

17. Most duct insulation is made of what?
Fiberglass
Latent and sensible
They are larger
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

18. What do you do after you braze a system?
Boil the liquid refrigerant out ot the oil within the crankcase
L-type
It rises
Pull a vacuum

19. What are the components of a hard-start kit?
A band 4 inches or more in width
Static pressure - velocity pressure - and total pressure
Boil the liquid refrigerant out ot the oil within the crankcase
Potential relay and start capacitor

20. What are the two functions of the air-conditioning system?
150
15% silphos
To remove humidity and lower dry bulb temperature
20 degrees F

21. 13 SEER is classified as what kind of efficiency?
High
Average feet per minute X area in square feet (H' x W'/144)
L-type
15% silphos

22. Superheat should never be below how many degrees
Subtract ambient temperature from 100
5 degrees
Below 800 degrees F
A piston type metering device

23. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
Any amount
Stranded
300

24. If the rpm's are 1750 - how many poles does the motor have?
Yes
Below 800 degrees F
4
1/4'

25. 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
It also rises
They are physically larger
6

26. Do you need a vent on a push-through evaporator?
With an are rating
1/4'
False
Yes

27. What is the range for normal superheat and subcooling?
When the system is under pressure
8-12 degrees F
The suction line or the low-pressure side
When it is above a conditioned space

28. 10' round duct has a ballpark cfm of what?
S-clips and drives (cleats)
It will be low
400
Rise

29. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Standard
Side-by-side and over-and-under
15% silphos
30 degrees F

30. 10' round duct has a ballpark cfm of what?
400
The suction line or the low-pressure side
30 degrees F
When it is above a conditioned space

31. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
45 degrees F
No
A bypass duct or a dump zone

32. Where do you apply flux when soldering?
Yes
Duct - electrical - and mechanical
Outside of the male fitting
Potential relay and start capacitor

33. Most duct insulation is made of what?
Fiberglass
SEER includes the energy used in the start-up and shut-down cycles
30 A
On the common terminal

34. How many amps can 10 g wire handle?
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
30 A
With a minimum of three evenly spaced self-tapping screws

35. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
300
When it is a pull-through evaporator
Shorted winding - open winding - and grounded winding

36. How long should you leave a system off once you kill power before restarting it?
2 minutes
20 degrees F
Duct - electrical - and mechanical
Side-by-side and over-and-under

37. Which type of wire can handle a higher ampacity?
Yes
The suction line or the low-pressure side
Stranded
With 4' saddles

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

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39. Will a dirty condenser cause a rise or fall in pressure?
Pull a vacuum
Suction
Rise
20 degrees F

40. 9' round duct has a ballpark cfm of what?
300
Rise
It also rises
Common

41. What are the two types of blower drives?
Belt drive and direct drive
Before the vent
20 degrees F
4

42. What are the three major power-consuming devices on an air-conditioning system?
Over/under and side by side
On the common terminal
100
Indoor fan motor - outdoor fan motor - and the compressor

43. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
With 4' saddles
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Duct with insulation on the inside

44. In what length rolls is soft copper tubing normally available?
The suction line or the low-pressure side
25-ft or 50-ft
In parallel
SEER includes the energy used in the start-up and shut-down cycles

45. The evaporator is designed to remove what two types of heat?
Rise
To remove humidity and lower dry bulb temperature
Latent and sensible
It also rises

46. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
A diffuser
When it is above a conditioned space
True
30 degrees F

47. What is the design boiling point for most evaporator coils in residential air conditioning?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
In series
Btu/hr (output) / wattage (input)
40 degrees F

48. How is nominal-sized tubing sized?
Inside diameter (ID)
ACR (air-conditioning refrigeration) tubing
Before the vent
True

49. Can refrigerant line sets be altered in length?
2
Yes
Nominal-sized tubing
Inside diameter (ID)

50. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
It will be low
L-type