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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. If the rpm's are 1050 - how many poles does the motor have?
True
TXV
6
105 degrees F

2. What distributes supply air to a room in a structure?
40 A
Standard
A diffuser
Pistons

3. What sort of pressure will a pull-through evaporator have?
Dehydrated with caps on each end
Heat load
Negative
6

4. The fan switch opens at what temperature?
In series
105 degrees F
15% silphos
TXV

5. Do you need a vent on a push-through evaporator?
20 degrees F
Yes
It also rises
By increasing the surface of the condenser coil

6. At what temperature will brazing melt?
300
Latent and sensible
TXV
Over 800 degrees F

7. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
5 degrees
Over/under and side by side
A band 4 inches or more in width

8. How are the condenser coils different on a high-efficiency unit?
They are larger
On the common terminal
False
300

9. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
A diffuser
40 degrees F
Vapor
Side-by-side and over-and-under

10. What is the design boiling point for most evaporator coils in residential air conditioning?
Btu/hr (output) / wattage (input)
40 degrees F
With 4' saddles
When the system is under pressure

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

12. If the suction pressure rises - what happens to the head pressure?
It also rises
SEER includes the energy used in the start-up and shut-down cycles
It will have a decrease in superheat
A swaging tool

13. If the suction pressure rises - what happens to the head pressure?
30-35 degrees above ambient
Infiltration and ventilation
It also rises
Individual return air systems and central return air systems

14. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Static pressure - velocity pressure - and total pressure
When it is a pull-through evaporator
400
45-55%

15. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
30-35 degrees above ambient
Compressor
45-55%
It will have a decrease in superheat

16. How are the condenser coils different on a high-efficiency unit?
Boil the liquid refrigerant out ot the oil within the crankcase
300
They are larger
Stranded

17. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Boil the liquid refrigerant out ot the oil within the crankcase
Btu/hr (output) / wattage (input)
20 degrees F

18. At what temperature does refrigerant condense in a high-efficiency unit?
Slugging
Potential relay and start capacitor
20 degrees above ambient
A dirty evaporator

19. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
TXV
8-12 degrees F
Individual return air systems and central return air systems
It will have a decrease in superheat

20. 13 SEER is classified as what kind of efficiency?
40 degrees F
Vapor
It rises
High

21. When do you install an auxillary drain pan?
To remove humidity and lower dry bulb temperature
When it is above a conditioned space
140 degrees F
Any amount

22. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
300
30 degrees F
Nominal-sized tubing

23. What kind of metering device do high-efficiency units usually use?
On the common terminal
TXV
Average feet per minute X area in square feet (H' x W'/144)
15% silphos

24. The evaporator is designed to remove what two types of heat?
Subtract ambient temperature from 100
40 degrees F
Latent and sensible
No

25. How much does a drain line need to drop per foot of length?

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26. The fan switch closes at what temperature?
Side-by-side and over-and-under
Negative
140 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase

27. 13 SEER is classified as what kind of efficiency?
18 gauge
High
The suction line or the low-pressure side
In parallel

28. What is the range for normal superheat and subcooling?
Negative
Any amount
8-12 degrees F
It will have a decrease in superheat

29. How is flexible duct supported?
Subtract ambient temperature from 100
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Nominal-sized tubing
A band 4 inches or more in width

30. How long should you leave a system off once you kill power before restarting it?
Yes
Boil the liquid refrigerant out ot the oil within the crankcase
2 minutes
Outside diameter (OD)

31. What is the typical pressure differance across a TXV?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
100 psig
Shorted winding - open winding - and grounded winding
8-12 degrees F

32. What gauge is thermostat wire?
Nominal-sized tubing
100 psig
25-ft or 50-ft
18 gauge

33. What are the components of a hard-start kit?
Potential relay and start capacitor
30-35 degrees above ambient
Side-by-side and over-and-under
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

34. How long should you leave a system off once you kill power before restarting it?
TXV
To lower the amount of pressure drop through the coil
2 minutes
12000

35. The furnace size is calculated by what?
Heat loss
5 degrees
Common
20 A

36. 10 SEER is classified as what kind of efficiency?
S-clips and drives (cleats)
Standard
A piston type metering device
40 degrees F

37. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Pistons
In series
L-type
Staples and tape

38. What is the difference between SEER and EER?
45-55%
Infiltration and ventilation
12000
SEER includes the energy used in the start-up and shut-down cycles

39. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
L-type
They are physically larger
Outside of the male fitting
It will have a decrease in superheat

40. Which type of wire can handle a higher ampacity?
Stranded
S-clips and drives (cleats)
Slugging
15 A

41. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
It will have a decrease in superheat
False
It also rises

42. How many amps can 8 g wire handle?
Inclined manometer
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Side-by-side and over-and-under
40 A

43. How many amps can 12 g wire handle?
30-35 degrees above ambient
No
20 A
Pistons

44. If the rpm's are 1750 - how many poles does the motor have?
4
L-type
300
Before the vent

45. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
False
2 minutes
A band 4 inches or more in width

46. How is flexible duct supported?
25-ft or 50-ft
A band 4 inches or more in width
Dehydrated with caps on each end
400

47. If the rpm's are 1750 - how many poles does the motor have?
4
Stranded
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

48. The crankcase heater on an air-conditioning compressor is used to what?
Individual return air systems and central return air systems
A bypass duct or a dump zone
Boil the liquid refrigerant out ot the oil within the crankcase
Nitrogen with a small amount of refrigerant

49. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Below 800 degrees F
40 degrees F
20 degrees above ambient

50. How do you calculate ballpark superheat?
5 degrees
30-35 degrees above ambient
Subtract ambient temperature from 100
100