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 standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Fiberglass
With an are rating
30-35 degrees above ambient

2. What kind of copper tubing is used for plumbing and heating applications?
Rise
Nominal-sized tubing
The takeoff fitting
105 degrees F

3. What are the two types of package units?
Side-by-side and over-and-under
Nominal-sized tubing
5 degrees
It will be low

4. What are the three major power-consuming devices on an air-conditioning system?
30 degrees F
25-ft or 50-ft
Outside diameter (OD)
Indoor fan motor - outdoor fan motor - and the compressor

5. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
They are physically larger
Inside diameter (ID)
The takeoff fitting

6. In what length rolls is soft copper tubing normally available?
Individual return air systems and central return air systems
200
A bypass duct or a dump zone
25-ft or 50-ft

7. At what temperature will brazing melt?
8
Stranded
Over 800 degrees F
Duct - electrical - and mechanical

8. How are round ducts supported?

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

9. What is the difference between SEER and EER?
400
Duct - electrical - and mechanical
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants

10. The furnace size is calculated by what?
45-55%
Heat loss
Staples and tape
To remove humidity and lower dry bulb temperature

11. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
It will have a decrease in superheat
Any amount
Pull a vacuum
Yes

12. If the suction pressure rises - what happens to the head pressure?
8
It also rises
Btu/hr (output) / wattage (input)
A piston type metering device

13. What kind of refrigeratnts must be added in liquid form?
Heat load
Before the vent
Subtract ambient temperature from 100
Blended refrigerants

14. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
A dirty evaporator
20 degrees above ambient
It also rises
40 degrees F

15. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
A bypass duct or a dump zone
A dirty evaporator
8-12 degrees F

16. Where do you apply flux when soldering?
True
Belt drive and direct drive
Outside of the male fitting
300

17. The fan switch opens at what temperature?
Pi x radius squared
105 degrees F
Belt drive and direct drive
25-ft or 50-ft

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

19. What is a package unit?
Yes
It will be high
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
When it is above a conditioned space

20. What are the components of a hard-start kit?
45 degrees F
Outside of the male fitting
Potential relay and start capacitor
400

21. 9' round duct has a ballpark cfm of what?
Yes
Outside diameter (OD)
It also rises
300

22. 8' round duct has a ballpark cfm of what?
It rises
1/4'
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
200

23. How do you calculate LRA?
300
Belt drive and direct drive
Positive
RLA/FLA x 5

24. When do you install a trap on a drain line?
Latent and sensible
Vapor
When it is a pull-through evaporator
Compressor

25. Can refrigerant line sets be altered in length?
2
Shorted winding - open winding - and grounded winding
Yes
Infiltration and ventilation

26. If the suction pressure rises - what happens to the head pressure?
False
8
It also rises
2 minutes

27. 13 SEER is classified as what kind of efficiency?
With a minimum of three evenly spaced self-tapping screws
High
Shorted winding - open winding - and grounded winding
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

28. What sort of pressure will a pull-through evaporator have?
8
No
150
Negative

29. Sections of duct board can be fastened together with what?
Staples and tape
Latent and sensible
Nitrogen with a small amount of refrigerant
Outside of the male fitting

30. How do you calculate cfm?

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

31. What is the normal evaporator temperature?
45 degrees F
30 degrees F
In parallel
Outside of the male fitting

32. How is insulation around a duct rated?
Yes
It will have a decrease in superheat
With an are rating
Inclined manometer

33. What is the design boiling point for most evaporator coils in residential air conditioning?
Suction
40 degrees F
8-12 degrees F
High

34. How do you calculate EER?
8-12 degrees F
Btu/hr (output) / wattage (input)
100 psig
The suction line or the low-pressure side

35. If the rpm's are 1050 - how many poles does the motor have?
6
True
TXV
Outside of the male fitting

36. Superheat should never be below how many degrees
Outside diameter (OD)
Average feet per minute X area in square feet (H' x W'/144)
Btu/hr (output) / wattage (input)
5 degrees

37. At what temperature does refrigerant condense in a standard-efficiency unit?
The takeoff fitting
It rises
30-35 degrees above ambient
L-type

38. In what state is the refrigerant in the compressor?
Yes
Yes
100
Vapor

39. In what state is the refrigerant in the compressor?
Latent and sensible
Vapor
Pistons
30 A

40. Do you need a trap on a pull-through evaporator?
To lower the amount of pressure drop through the coil
Side-by-side and over-and-under
Yes
30 A

41. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
200
A diffuser
A piston type metering device

42. The crankcase heater on an air-conditioning compressor is used to what?
Yes
Average feet per minute X area in square feet (H' x W'/144)
150
Boil the liquid refrigerant out ot the oil within the crankcase

43. What are the two basic duct connection configurations for package units supply and return air ducts?
Indoor fan motor - outdoor fan motor - and the compressor
400
Over/under and side by side
Suction

44. How is nominal-sized tubing sized?
A swaging tool
Over 800 degrees F
Common
Inside diameter (ID)

45. Do you need a trap on a push-through evaporator?
20 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
In series
No

46. Sections of duct board can be fastened together with what?
It will be low
Staples and tape
Vapor
25-ft or 50-ft

47. 10 SEER is classified as what kind of efficiency?
Standard
A dirty evaporator
In parallel
400

48. Pressure in ductwork is measured In what?
5 degrees
Inches of water column (in. WC)
The suction line or the low-pressure side
Over 800 degrees F

49. What kind of metering device do high-efficiency units usually use?
TXV
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
When it is above a conditioned space

50. Where do you install a trap on a drain line?
A bypass duct or a dump zone
15% silphos
Before the vent
Belt drive and direct drive