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. What are the three ways a motor can fail electrically?
Static pressure - velocity pressure - and total pressure
In parallel
Shorted winding - open winding - and grounded winding
RLA/FLA x 5

2. When must a copper joint never be soldered or brazed?
When the system is under pressure
A swaging tool
Common
It rises

3. A reciprocating compressor has what sort of moving parts?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
400
Pistons
Indoor fan motor - outdoor fan motor - and the compressor

4. How will too much refrigerant effect subcooling?
400
TXV
It will be high
Indoor fan motor - outdoor fan motor - and the compressor

5. Superheat should never be below how many degrees
105 degrees F
Static pressure - velocity pressure - and total pressure
When it is above a conditioned space
5 degrees

6. The evaporator is designed to remove what two types of heat?
A dirty evaporator
SEER includes the energy used in the start-up and shut-down cycles
5 degrees
Latent and sensible

7. What kind of refrigeratnts must be added in liquid form?
Outside of the male fitting
L-type
Average feet per minute X area in square feet (H' x W'/144)
Blended refrigerants

8. At what temperature will soft solder melt?
Yes
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Below 800 degrees F
The takeoff fitting

9. How do you calculate LRA?
RLA/FLA x 5
Average feet per minute X area in square feet (H' x W'/144)
Yes
Outside of the male fitting

10. What distributes supply air to a room in a structure?
Inclined manometer
4
Pull a vacuum
A diffuser

11. What are the four materials used to make duct?
The takeoff fitting
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
They are physically larger
Vapor

12. How is nominal-sized tubing sized?
Compressor
18 gauge
Boil the liquid refrigerant out ot the oil within the crankcase
Inside diameter (ID)

13. 9' round duct has a ballpark cfm of what?
With an are rating
300
A diffuser
False

14. When do you install an auxillary drain pan?
Pi x radius squared
Yes
Below 800 degrees F
When it is above a conditioned space

15. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
It rises
Dehydrated with caps on each end
30 degrees F
2

16. 13 SEER is classified as what kind of efficiency?
High
140 degrees F
Side-by-side and over-and-under
Staples and tape

17. What are the three ways a motor can fail electrically?
Common
True
By increasing the surface of the condenser coil
Shorted winding - open winding - and grounded winding

18. The fan switch opens at what temperature?
By increasing the surface of the condenser coil
105 degrees F
Potential relay and start capacitor
Suction

19. What are the components of a hard-start kit?
200
Pistons
Potential relay and start capacitor
Yes

20. What is used to measure static air pressure in ducts.
8-12 degrees F
Inclined manometer
Yes
With 4' saddles

21. What is a package unit?
Side-by-side and over-and-under
It will be low
Outside of the male fitting
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

22. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
Slugging
Pull a vacuum
Btu/hr (output) / wattage (input)

23. What distributes supply air to a room in a structure?
A diffuser
Yes
True
Common

24. How many BTU's per ton?
Slugging
Belt drive and direct drive
12000
The takeoff fitting

25. What type of air conditioning system must be charged using the superheat method?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Inclined manometer
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
A piston type metering device

26. How do you calculate ballpark superheat?
8
400
When it is a pull-through evaporator
Subtract ambient temperature from 100

27. How long should you leave a system off once you kill power before restarting it?
Inches of water column (in. WC)
Vapor
8
2 minutes

28. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
Fiberglass
200
Negative

29. When do you install a trap on a drain line?
To lower the amount of pressure drop through the coil
Negative
When it is a pull-through evaporator
Any amount

30. At what temperature does refrigerant condense in a standard-efficiency unit?
Common
20 degrees above ambient
Indoor fan motor - outdoor fan motor - and the compressor
30-35 degrees above ambient

31. How is the high pressure switch wired with the low pressure switch?
Btu/hr (output) / wattage (input)
140 degrees F
In parallel
True

32. What is used to measure static air pressure in ducts.
Inclined manometer
Staples and tape
TXV
Boil the liquid refrigerant out ot the oil within the crankcase

33. Where do you check the amps on a motor?
RLA/FLA x 5
S-clips and drives (cleats)
4
On the common terminal

34. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
300
Yes
Inclined manometer

35. How is insulation around a duct rated?
Positive
With an are rating
Below 800 degrees F
Static pressure - velocity pressure - and total pressure

36. What is the typical pressure differance across a TXV?
100 psig
It will be low
S-clips and drives (cleats)
Shorted winding - open winding - and grounded winding

37. What do you use to check for leaks?
Dehydrated with caps on each end
6
Slugging
Nitrogen with a small amount of refrigerant

38. Which type of wire can handle a higher ampacity?
Before the vent
Yes
S-clips and drives (cleats)
Stranded

39. What gauge is thermostat wire?
Over/under and side by side
Before the vent
A piston type metering device
18 gauge

40. When do you install an auxillary drain pan?
Blended refrigerants
A band 4 inches or more in width
When it is above a conditioned space
S-clips and drives (cleats)

41. How are round ducts supported?

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

42. How many amps can 8 g wire handle?
40 A
It will have a decrease in superheat
Outside diameter (OD)
They are physically larger

43. How many cfm per ton?
105 degrees F
By increasing the surface of the condenser coil
400
40 degrees F

44. Do you need a trap on a push-through evaporator?
No
5 degrees
Yes
Stranded

45. What is lined duct?
Blended refrigerants
A bypass duct or a dump zone
Duct with insulation on the inside
It rises

46. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Any amount
RLA/FLA x 5
Inclined manometer
A diffuser

47. What are the two types of blower drives?
Outside diameter (OD)
300
Belt drive and direct drive
In series

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
SEER includes the energy used in the start-up and shut-down cycles
45 degrees F

49. What do you use to connect square and rectangular ductboard together?
The takeoff fitting
45 degrees F
Common
S-clips and drives (cleats)

50. What is the name of the fitting where the branch line leaves the duct?
With a minimum of three evenly spaced self-tapping screws
30-35 degrees above ambient
The takeoff fitting
30 degrees F