SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
Test your basic knowledge |
Residential Air Conditioning
Start Test
Study First
Subjects
:
engineering
,
nate
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. When must a copper joint never be soldered or brazed?
Belt drive and direct drive
When the system is under pressure
They are larger
40 degrees F
2. Which type of wire can handle a higher ampacity?
300
The suction line or the low-pressure side
25-ft or 50-ft
Stranded
3. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
TXV
It will have a decrease in superheat
It rises
A swaging tool
4. What are the three pressures created by moving air in ductwork?
It rises
20 A
Static pressure - velocity pressure - and total pressure
It will have a decrease in superheat
5. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
Below 800 degrees F
Yes
Stranded
6. How is nominal-sized tubing sized?
Pi x radius squared
When it is above a conditioned space
Inside diameter (ID)
40 A
7. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
100 psig
S-clips and drives (cleats)
20 degrees F
8. What percentage silver do you need to use for an are-410 system?
15% silphos
Pi x radius squared
20 A
105 degrees F
9. Do you need a trap on a pull-through evaporator?
Yes
20 degrees above ambient
A piston type metering device
4
10. Do you need a trap on a pull-through evaporator?
Yes
A diffuser
30-35 degrees above ambient
Subtract ambient temperature from 100
11. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
Static pressure - velocity pressure - and total pressure
By increasing the surface of the condenser coil
Before the vent
12. Can refrigerant line sets be altered in length?
Staples and tape
Any amount
Yes
1/4'
13. Do you need a trap on a push-through evaporator?
A bypass duct or a dump zone
Pull a vacuum
15 A
No
14. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
100
Compressor
45-55%
40 A
15. How many amps can 14 g wire handle?
40 A
15 A
RLA/FLA x 5
18 gauge
16. What are the two ways that fresh air enters a structure?
A piston type metering device
Infiltration and ventilation
Common
The suction line or the low-pressure side
17. What are the three crafts normally associated with an air-conditioned installation?
They are physically larger
It will be high
Shorted winding - open winding - and grounded winding
Duct - electrical - and mechanical
18. What type of air conditioning system must be charged using the superheat method?
It will be low
Infiltration and ventilation
A piston type metering device
Belt drive and direct drive
19. The fan switch opens at what temperature?
105 degrees F
Outside diameter (OD)
Before the vent
In parallel
20. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Yes
Inclined manometer
2 minutes
21. How many BTU's per ton?
Outside of the male fitting
12000
Indoor fan motor - outdoor fan motor - and the compressor
In series
22. How are round ducts supported?
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
23. How many amps can 14 g wire handle?
15 A
To lower the amount of pressure drop through the coil
300
Positive
24. In what length rolls is soft copper tubing normally available?
Boil the liquid refrigerant out ot the oil within the crankcase
25-ft or 50-ft
In series
Fiberglass
25. How will too much refrigerant effect superheat?
It will be low
15% silphos
4
L-type
26. Where do you install a trap on a drain line?
Before the vent
4
Yes
Stranded
27. Do you need a vent on a push-through evaporator?
Yes
It will be high
8
25-ft or 50-ft
28. How are round ducts connected to one another?
Individual return air systems and central return air systems
30 degrees F
A swaging tool
With a minimum of three evenly spaced self-tapping screws
29. The crankcase heater on an air-conditioning compressor is used to what?
200
8
Boil the liquid refrigerant out ot the oil within the crankcase
Over 800 degrees F
30. Will a dirty condenser cause a rise or fall in pressure?
Shorted winding - open winding - and grounded winding
Rise
With a minimum of three evenly spaced self-tapping screws
5 degrees
31. Where is insulation used on copper tubing used for air-conditioning?
True
30 degrees F
In series
The suction line or the low-pressure side
32. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Fiberglass
Indoor fan motor - outdoor fan motor - and the compressor
When it is above a conditioned space
33. How many amps can 12 g wire handle?
150
20 A
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Side-by-side and over-and-under
34. What are the two types of blower drives?
Staples and tape
TXV
400
Belt drive and direct drive
35. The fan switch closes at what temperature?
When it is a pull-through evaporator
Vapor
140 degrees F
Fiberglass
36. When do you install an auxillary drain pan?
When it is above a conditioned space
Heat loss
15 A
Heat loss
37. What are the components of a hard-start kit?
High
Slugging
Potential relay and start capacitor
Staples and tape
38. How are the condenser coils different on a high-efficiency unit?
In series
Stranded
Positive
They are larger
39. What gauge is thermostat wire?
Duct with insulation on the inside
TXV
18 gauge
By increasing the surface of the condenser coil
40. What are the three ways a motor can fail electrically?
In parallel
True
L-type
Shorted winding - open winding - and grounded winding
41. What tool is used to expand the diameter of soft copper tubing
They are physically larger
2 minutes
Heat load
A swaging tool
42. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Duct - electrical - and mechanical
No
45-55%
Yes
43. What sort of pressure will a push-through evaporator have?
Subtract ambient temperature from 100
Positive
18 gauge
In series
44. At what temperature will brazing melt?
Over 800 degrees F
30-35 degrees above ambient
Indoor fan motor - outdoor fan motor - and the compressor
30 A
45. How does ACR copper pipe come?
It will have a decrease in superheat
They are larger
Dehydrated with caps on each end
140 degrees F
46. The compressor is cooled by liquid refrigerant. (True of False)
Blended refrigerants
30 degrees F
False
With a minimum of three evenly spaced self-tapping screws
47. What can cause a decrease in suction pressure on an air-conditioning system?
1/4'
Inside diameter (ID)
Below 800 degrees F
A dirty evaporator
48. 6' round duct has a ballpark cfm of what?
When it is above a conditioned space
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
100
49. What are the three major power-consuming devices on an air-conditioning system?
True
Vapor
6
Indoor fan motor - outdoor fan motor - and the compressor
50. Where do you check the amps on a motor?
300
Vapor
On the common terminal
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity