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. At what temperature does refrigerant condense in a high-efficiency unit?
Duct - electrical - and mechanical
Inclined manometer
Outside of the male fitting
20 degrees above ambient

2. How do you calculate cfm?

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3. What type of air conditioning system must be charged using the superheat method?
Staples and tape
Common
No
A piston type metering device

4. How many cfm per ton?
400
High
On the common terminal
Outside diameter (OD)

5. How is ACR tubing sized?
Heat load
Outside diameter (OD)
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
TXV

6. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Belt drive and direct drive
True
Boil the liquid refrigerant out ot the oil within the crankcase
Pistons

7. How many amps can 10 g wire handle?
30 A
25-ft or 50-ft
When it is above a conditioned space
Suction

8. What are the three crafts normally associated with an air-conditioned installation?
Vapor
Duct - electrical - and mechanical
100
High

9. The load on the evaporater will effect which pressure?
Boil the liquid refrigerant out ot the oil within the crankcase
Suction
It will have a decrease in superheat
Blended refrigerants

10. How many amps can 12 g wire handle?
In series
20 A
12000
5 degrees

11. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
Static pressure - velocity pressure - and total pressure
It also rises
False

12. In what state is the refrigerant in the compressor?
Pi x radius squared
40 A
Inside diameter (ID)
Vapor

13. Does a package unit come from the factory pre-charged?
Over/under and side by side
Yes
Over 800 degrees F
A swaging tool

14. How do you calculate the area of a circle?
Yes
Pi x radius squared
Heat loss
Fiberglass

15. In what state is the refrigerant in the compressor?
It will be high
Yes
Outside diameter (OD)
Vapor

16. What component changes refrigerant from a low pressure gas to a high pressure gas?
TXV
Latent and sensible
When it is above a conditioned space
Compressor

17. The evaporator is designed to remove what two types of heat?
Indoor fan motor - outdoor fan motor - and the compressor
When it is above a conditioned space
It will have a decrease in superheat
Latent and sensible

18. At what temperature does refrigerant condense in a standard-efficiency unit?
Blended refrigerants
Average feet per minute X area in square feet (H' x W'/144)
Static pressure - velocity pressure - and total pressure
30-35 degrees above ambient

19. How is nominal-sized tubing sized?
45-55%
1/4'
Inside diameter (ID)
2 minutes

20. 13 SEER is classified as what kind of efficiency?
They are physically larger
High
When it is a pull-through evaporator
Blended refrigerants

21. When do you install an auxillary drain pan?
Latent and sensible
40 degrees F
When it is above a conditioned space
Btu/hr (output) / wattage (input)

22. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
6
18 gauge
20 degrees F
Shorted winding - open winding - and grounded winding

23. What percentage silver do you need to use for an are-410 system?
45-55%
15% silphos
400
Compressor

24. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
On the common terminal
Static pressure - velocity pressure - and total pressure
400

25. Superheat should never be below how many degrees
30 A
18 gauge
Below 800 degrees F
5 degrees

26. What kind of metering device do high-efficiency units usually use?
Suction
20 degrees above ambient
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
TXV

27. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Indoor fan motor - outdoor fan motor - and the compressor
When it is a pull-through evaporator
40 A

28. What is the name of the fitting where the branch line leaves the duct?
No
6
The takeoff fitting
With an are rating

29. If the suction pressure rises - what happens to the head pressure?
It also rises
12000
Btu/hr (output) / wattage (input)
ACR (air-conditioning refrigeration) tubing

30. What is the design boiling point for most evaporator coils in residential air conditioning?
200
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
40 degrees F
It will have a decrease in superheat

31. The crankcase heater on an air-conditioning compressor is used to what?
Outside of the male fitting
Boil the liquid refrigerant out ot the oil within the crankcase
Inside diameter (ID)
It rises

32. The compressor is cooled by liquid refrigerant. (True of False)
Boil the liquid refrigerant out ot the oil within the crankcase
400
False
Latent and sensible

33. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
Standard
300
20 A

34. If pressure rises - what happens to the superheat?
When it is a pull-through evaporator
15% silphos
It rises
Individual return air systems and central return air systems

35. What is used to measure static air pressure in ducts.
25-ft or 50-ft
Inclined manometer
True
It will have a decrease in superheat

36. What is the typical pressure differance across a TXV?
2 minutes
40 degrees F
25-ft or 50-ft
100 psig

37. If the rpm's are 1050 - how many poles does the motor have?
Standard
It also rises
6
Vapor

38. 8' round duct has a ballpark cfm of what?
Yes
Subtract ambient temperature from 100
Yes
200

39. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
Over 800 degrees F
Positive
No

40. 7' round duct has a ballpark cfm of what?
They are physically larger
Yes
Latent and sensible
150

41. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Rise
Individual return air systems and central return air systems
Outside diameter (OD)

42. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
150
A bypass duct or a dump zone
Blended refrigerants
In series

43. Where do you install a trap on a drain line?
12000
Positive
Before the vent
25-ft or 50-ft

44. How do you calculate EER?
Duct - electrical - and mechanical
Btu/hr (output) / wattage (input)
Below 800 degrees F
High

45. 8' round duct has a ballpark cfm of what?
20 A
200
In parallel
Outside diameter (OD)

46. 6' round duct has a ballpark cfm of what?
40 A
100
Outside of the male fitting
Pistons

47. How many amps can 10 g wire handle?
A band 4 inches or more in width
300
Before the vent
30 A

48. How do you calculate EER?
2 minutes
Btu/hr (output) / wattage (input)
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Yes

49. Do you need a vent on a push-through evaporator?
They are physically larger
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Pull a vacuum
Yes

50. What kind of metering device do high-efficiency units usually use?
20 A
TXV
Pi x radius squared
Positive