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. How are round ducts connected to one another?
Boil the liquid refrigerant out ot the oil within the crankcase
Yes
In series
With a minimum of three evenly spaced self-tapping screws

2. How many cfm per ton?
Potential relay and start capacitor
A swaging tool
400
A bypass duct or a dump zone

3. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
Rise
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Staples and tape

4. How are the condenser coils different on a high-efficiency unit?
They are larger
25-ft or 50-ft
Yes
When it is above a conditioned space

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

6. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
It will be low
30-35 degrees above ambient
When the system is under pressure
L-type

7. 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

8. At what temperature will brazing melt?
18 gauge
A piston type metering device
Over 800 degrees F
400

9. 9' round duct has a ballpark cfm of what?
300
20 A
Compressor
Over 800 degrees F

10. How many amps can 14 g wire handle?
15 A
Subtract ambient temperature from 100
Negative
Inches of water column (in. WC)

11. Do you need a vent on a pull-through evaporator?
Yes
Nitrogen with a small amount of refrigerant
15 A
2

12. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Boil the liquid refrigerant out ot the oil within the crankcase
TXV
Slugging
Any amount

13. What are the two types of blower drives?
The takeoff fitting
Belt drive and direct drive
45-55%
TXV

14. Does a package unit come from the factory pre-charged?
Yes
Shorted winding - open winding - and grounded winding
With an are rating
Blended refrigerants

15. How do you calculate LRA?
Inside diameter (ID)
RLA/FLA x 5
Pistons
S-clips and drives (cleats)

16. What is the range for normal superheat and subcooling?
20 degrees above ambient
8-12 degrees F
ACR (air-conditioning refrigeration) tubing
By increasing the surface of the condenser coil

17. What is the typical pressure differance across a TXV?
20 degrees above ambient
100 psig
Shorted winding - open winding - and grounded winding
Nitrogen with a small amount of refrigerant

18. 8' round duct has a ballpark cfm of what?
200
Nominal-sized tubing
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Belt drive and direct drive

19. 10' round duct has a ballpark cfm of what?
The suction line or the low-pressure side
Indoor fan motor - outdoor fan motor - and the compressor
To remove humidity and lower dry bulb temperature
400

20. How are round ducts connected to one another?
ACR (air-conditioning refrigeration) tubing
18 gauge
Latent and sensible
With a minimum of three evenly spaced self-tapping screws

21. How is flexible duct supported?
8
A band 4 inches or more in width
Heat load
A diffuser

22. The fan switch opens at what temperature?
105 degrees F
In parallel
Blended refrigerants
Before the vent

23. Will a dirty condenser cause a rise or fall in pressure?
Rise
Inches of water column (in. WC)
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Compressor

24. What are the two types of blower drives?
Suction
20 A
Belt drive and direct drive
Positive

25. What is the difference between SEER and EER?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Yes
SEER includes the energy used in the start-up and shut-down cycles
140 degrees F

26. What is used to measure static air pressure in ducts.
A piston type metering device
20 degrees F
They are physically larger
Inclined manometer

27. If pressure rises - what happens to the superheat?
Before the vent
It rises
20 A
30 degrees F

28. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
Inclined manometer
Positive
Slugging

29. 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

30. What are the two types of package units?
Blended refrigerants
Compressor
Side-by-side and over-and-under
8

31. How are round ducts supported?

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

32. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
12000
Before the vent
Outside of the male fitting

33. How long should you leave a system off once you kill power before restarting it?
A dirty evaporator
A piston type metering device
4
2 minutes

34. What are normal conditions - as defined by the ARI.
ACR (air-conditioning refrigeration) tubing
Belt drive and direct drive
L-type
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

35. What are the two types of package units?
Side-by-side and over-and-under
A bypass duct or a dump zone
Stranded
105 degrees F

36. In what length rolls is soft copper tubing normally available?
Belt drive and direct drive
Suction
25-ft or 50-ft
Yes

37. Which is more efficient - a TXV or a fixed-orifice metering device?
5 degrees
400
TXV
It rises

38. In what state is the refrigerant in the compressor?
Vapor
2 minutes
Standard
Yes

39. What is the difference between SEER and EER?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
SEER includes the energy used in the start-up and shut-down cycles
On the common terminal
They are physically larger

40. 10 SEER is classified as what kind of efficiency?
40 degrees F
TXV
Standard
When it is a pull-through evaporator

41. If the rpm's are 3450 - how many poles does the motor have?
8-12 degrees F
400
2
40 degrees F

42. What are the components of a hard-start kit?
Negative
140 degrees F
Potential relay and start capacitor
A band 4 inches or more in width

43. What do you use to check for leaks?
Yes
Nitrogen with a small amount of refrigerant
Inclined manometer
In series

44. What kind of refrigeratnts must be added in liquid form?
Over 800 degrees F
Blended refrigerants
Inches of water column (in. WC)
Over 800 degrees F

45. If the rpm's are 750 - how many poles does the motor have?
8
Below 800 degrees F
Static pressure - velocity pressure - and total pressure
Outside diameter (OD)

46. If the suction pressure rises - what happens to the head pressure?
When it is above a conditioned space
A piston type metering device
It also rises
12000

47. Why are some ACR tubing lines insulated?
12000
2
2
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

48. The crankcase heater on an air-conditioning compressor is used to what?
Fiberglass
Boil the liquid refrigerant out ot the oil within the crankcase
By increasing the surface of the condenser coil
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

49. What distributes supply air to a room in a structure?
A diffuser
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Static pressure - velocity pressure - and total pressure
Nitrogen with a small amount of refrigerant

50. In what length rolls is soft copper tubing normally available?
They are physically larger
Belt drive and direct drive
25-ft or 50-ft
Static pressure - velocity pressure - and total pressure