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 will brazing melt?
40 degrees F
They are physically larger
6
Over 800 degrees F

2. 10 SEER is classified as what kind of efficiency?
Standard
18 gauge
TXV
2 minutes

3. How many amps can 14 g wire handle?
15 A
30 A
RLA/FLA x 5
Indoor fan motor - outdoor fan motor - and the compressor

4. What is considered normal operating conditions?
TXV
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Common
It rises

5. What kind of metering device do high-efficiency units usually use?
TXV
Common
False
Yes

6. How will too much refrigerant effect superheat?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It will be low
When the system is under pressure
A bypass duct or a dump zone

7. What is the difference between SEER and EER?
Side-by-side and over-and-under
Pi x radius squared
SEER includes the energy used in the start-up and shut-down cycles
Heat loss

8. In what state is the refrigerant in the compressor?
45 degrees F
Vapor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes

9. The compressor is cooled by liquid refrigerant. (True of False)
When the system is under pressure
False
20 degrees F
Potential relay and start capacitor

10. 9' round duct has a ballpark cfm of what?
300
True
2
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

11. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Indoor fan motor - outdoor fan motor - and the compressor
S-clips and drives (cleats)
Static pressure - velocity pressure - and total pressure

12. How will too much refrigerant effect superheat?
Heat loss
It will be low
2
40 degrees F

13. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
140 degrees F
Any amount
Yes
Standard

14. How are the condenser coils different on a high-efficiency unit?
They are larger
1/4'
Any amount
8

15. On what terminal do you check amperage?
Subtract ambient temperature from 100
Common
Suction
30 A

16. If the rpm's are 3450 - how many poles does the motor have?
2
5 degrees
To lower the amount of pressure drop through the coil
In series

17. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
False
Outside diameter (OD)
They are larger

18. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
400
20 A
They are physically larger
Indoor fan motor - outdoor fan motor - and the compressor

19. How is flexible duct supported?
Over/under and side by side
A band 4 inches or more in width
Any amount
Fiberglass

20. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
400
4
20 degrees F
Yes

21. What is the difference between SEER and EER?
Nitrogen with a small amount of refrigerant
S-clips and drives (cleats)
Vapor
SEER includes the energy used in the start-up and shut-down cycles

22. At what temperature does refrigerant condense in a high-efficiency unit?
30-35 degrees above ambient
20 degrees above ambient
Below 800 degrees F
Shorted winding - open winding - and grounded winding

23. 10 SEER is classified as what kind of efficiency?
To lower the amount of pressure drop through the coil
It rises
Individual return air systems and central return air systems
Standard

24. What component changes refrigerant from a low pressure gas to a high pressure gas?
Compressor
Any amount
It will have a decrease in superheat
20 degrees F

25. What are the two types of blower drives?
Indoor fan motor - outdoor fan motor - and the compressor
It rises
Belt drive and direct drive
Vapor

26. The fan switch opens at what temperature?
Inclined manometer
105 degrees F
45-55%
Any amount

27. What is the name of the fitting where the branch line leaves the duct?
Pistons
The takeoff fitting
With an are rating
Outside of the male fitting

28. Pressure in ductwork is measured In what?
Static pressure - velocity pressure - and total pressure
No
Inches of water column (in. WC)
A dirty evaporator

29. What are the three pressures created by moving air in ductwork?
300
Static pressure - velocity pressure - and total pressure
105 degrees F
Inclined manometer

30. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
Subtract ambient temperature from 100
A bypass duct or a dump zone
Yes

31. What are the three pressures created by moving air in ductwork?
8
40 degrees F
Static pressure - velocity pressure - and total pressure
15 A

32. Do you need a trap on a pull-through evaporator?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
A piston type metering device
Yes

33. At what temperature will soft solder melt?
Heat load
They are physically larger
Outside of the male fitting
Below 800 degrees F

34. At what temperature will soft solder melt?
Vapor
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Below 800 degrees F
Latent and sensible

35. What kind of refrigeratnts must be added in liquid form?
Fiberglass
Blended refrigerants
With an are rating
Dehydrated with caps on each end

36. What is a package unit?
A piston type metering device
30 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Dehydrated with caps on each end

37. Do you need a vent on a push-through evaporator?
Yes
Outside diameter (OD)
S-clips and drives (cleats)
To lower the amount of pressure drop through the coil

38. How many BTU's per ton?
12000
Fiberglass
Below 800 degrees F
Heat load

39. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
100
Positive
It will be low

40. A reciprocating compressor has what sort of moving parts?
150
When it is a pull-through evaporator
Pistons
Infiltration and ventilation

41. What sort of pressure will a pull-through evaporator have?
Over/under and side by side
Negative
2 minutes
No

42. What are the two types of package units?
Belt drive and direct drive
Side-by-side and over-and-under
Over/under and side by side
15 A

43. If the rpm's are 750 - how many poles does the motor have?
400
8
100
Duct - electrical - and mechanical

44. Sections of duct board can be fastened together with what?
12000
30-35 degrees above ambient
Fiberglass
Staples and tape

45. What are the two types of return air systems in residential installations?
Latent and sensible
Individual return air systems and central return air systems
Pull a vacuum
200

46. What is the range for normal superheat and subcooling?
8-12 degrees F
Duct - electrical - and mechanical
SEER includes the energy used in the start-up and shut-down cycles
To remove humidity and lower dry bulb temperature

47. What kind of copper tubing is used for refrigeration or air-conditioning applications?
The suction line or the low-pressure side
ACR (air-conditioning refrigeration) tubing
In series
Shorted winding - open winding - and grounded winding

48. What kind of refrigeratnts must be added in liquid form?
RLA/FLA x 5
A bypass duct or a dump zone
Nitrogen with a small amount of refrigerant
Blended refrigerants

49. The compressor is cooled by liquid refrigerant. (True of False)
False
Common
8-12 degrees F
Over/under and side by side

50. On what terminal do you check amperage?
40 degrees F
25-ft or 50-ft
Common
Shorted winding - open winding - and grounded winding