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. A reciprocating compressor has what sort of moving parts?
Pistons
20 degrees F
TXV
18 gauge

2. At what temperature will brazing melt?
A band 4 inches or more in width
Yes
Over 800 degrees F
Pull a vacuum

3. How many cfm per ton?
6
It also rises
Standard
400

4. The evaporator is designed to remove what two types of heat?
8
RLA/FLA x 5
Latent and sensible
Pistons

5. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Duct with insulation on the inside
40 degrees F
Pi x radius squared
6

6. If the rpm's are 750 - how many poles does the motor have?
Heat loss
When it is above a conditioned space
8
Fiberglass

7. 10' round duct has a ballpark cfm of what?
20 A
105 degrees F
1/4'
400

8. What kind of copper tubing is used for refrigeration or air-conditioning applications?
ACR (air-conditioning refrigeration) tubing
30-35 degrees above ambient
6
2

9. 13 SEER is classified as what kind of efficiency?
Any amount
200
Pull a vacuum
High

10. Will a dirty condenser cause a rise or fall in pressure?
Rise
Over/under and side by side
100
The suction line or the low-pressure side

11. When do you install an auxillary drain pan?
When it is above a conditioned space
Boil the liquid refrigerant out ot the oil within the crankcase
Indoor fan motor - outdoor fan motor - and the compressor
S-clips and drives (cleats)

12. The crankcase heater on an air-conditioning compressor is used to what?
When it is a pull-through evaporator
SEER includes the energy used in the start-up and shut-down cycles
Boil the liquid refrigerant out ot the oil within the crankcase
8

13. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
In series
Yes
With a minimum of three evenly spaced self-tapping screws

14. On what terminal do you check amperage?
With an are rating
Common
1/4'
18 gauge

15. How do you calculate ballpark superheat?
40 A
Rise
Subtract ambient temperature from 100
Nitrogen with a small amount of refrigerant

16. What is considered normal operating conditions?
It also rises
Rise
A swaging tool
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

17. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Pull a vacuum
Rise
The takeoff fitting

18. How is ACR tubing sized?
2 minutes
Static pressure - velocity pressure - and total pressure
A swaging tool
Outside diameter (OD)

19. At what temperature does refrigerant condense in a standard-efficiency unit?
45-55%
Compressor
30-35 degrees above ambient
45-55%

20. The A/C size is calculated by what?
100 psig
150
Pi x radius squared
Heat load

21. Which is more efficient - a TXV or a fixed-orifice metering device?
6
TXV
Blended refrigerants
Blended refrigerants

22. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
Shorted winding - open winding - and grounded winding
L-type
Before the vent

23. What are normal conditions - as defined by the ARI.
In series
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
18 gauge

24. What is it called when liquid refrigerant gets into the compressor?
6
A bypass duct or a dump zone
Slugging
Vapor

25. When do you install a trap on a drain line?
When it is a pull-through evaporator
When the system is under pressure
To remove humidity and lower dry bulb temperature
2

26. What are the components of a hard-start kit?
2
Slugging
TXV
Potential relay and start capacitor

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

28. What distributes supply air to a room in a structure?
Outside diameter (OD)
A diffuser
Infiltration and ventilation
Boil the liquid refrigerant out ot the oil within the crankcase

29. If the rpm's are 3450 - how many poles does the motor have?
With an are rating
On the common terminal
2
ACR (air-conditioning refrigeration) tubing

30. What are the two basic duct connection configurations for package units supply and return air ducts?
A piston type metering device
It will be low
With a minimum of three evenly spaced self-tapping screws
Over/under and side by side

31. Do you need a trap on a pull-through evaporator?
ACR (air-conditioning refrigeration) tubing
Yes
A diffuser
SEER includes the energy used in the start-up and shut-down cycles

32. What is the normal evaporator temperature?
Inches of water column (in. WC)
TXV
45 degrees F
140 degrees F

33. How are round ducts supported?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

34. Where do you apply flux when soldering?
100 psig
A band 4 inches or more in width
To remove humidity and lower dry bulb temperature
Outside of the male fitting

35. If the rpm's are 3450 - how many poles does the motor have?
When the system is under pressure
2
Heat loss
The suction line or the low-pressure side

36. What are the two functions of the air-conditioning system?
They are larger
To remove humidity and lower dry bulb temperature
20 degrees F
S-clips and drives (cleats)

37. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
When the system is under pressure
S-clips and drives (cleats)
High

38. 8' round duct has a ballpark cfm of what?
200
To remove humidity and lower dry bulb temperature
Indoor fan motor - outdoor fan motor - and the compressor
Fiberglass

39. 7' round duct has a ballpark cfm of what?
150
Over/under and side by side
300
Rise

40. Do you need a trap on a push-through evaporator?
No
TXV
Boil the liquid refrigerant out ot the oil within the crankcase
Below 800 degrees F

41. What is a package unit?
With 4' saddles
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
45 degrees F
Shorted winding - open winding - and grounded winding

42. What sort of pressure will a pull-through evaporator have?
Over 800 degrees F
Yes
Negative
With a minimum of three evenly spaced self-tapping screws

43. What is the range for normal superheat and subcooling?
8-12 degrees F
Outside diameter (OD)
8
Standard

44. How will too much refrigerant effect subcooling?
Blended refrigerants
100
It will be high
400

45. How do you achieve high-efficiency?
A piston type metering device
By increasing the surface of the condenser coil
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
20 A

46. In what state is the refrigerant in the compressor?
The takeoff fitting
200
Vapor
High

47. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
2
40 degrees F
By increasing the surface of the condenser coil

48. How will too much refrigerant effect superheat?
Any amount
L-type
Staples and tape
It will be low

49. Do you need a trap on a pull-through evaporator?
Pistons
Yes
Shorted winding - open winding - and grounded winding
25-ft or 50-ft

50. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
200
30 degrees F
A dirty evaporator
300