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. What are the three pressures created by moving air in ductwork?
Average feet per minute X area in square feet (H' x W'/144)
Static pressure - velocity pressure - and total pressure
200
Common
2. How much does a drain line need to drop per foot of length?
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
3. Which type of wire can handle a higher ampacity?
Suction
Stranded
Outside of the male fitting
To remove humidity and lower dry bulb temperature
4. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
Heat loss
40 A
30 A
5. What is used to measure static air pressure in ducts.
Inclined manometer
Duct - electrical - and mechanical
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Dehydrated with caps on each end
6. What do you do after you braze a system?
Pull a vacuum
2 minutes
Boil the liquid refrigerant out ot the oil within the crankcase
Shorted winding - open winding - and grounded winding
7. When must a copper joint never be soldered or brazed?
When the system is under pressure
Negative
105 degrees F
Slugging
8. How is flexible duct supported?
Negative
40 A
SEER includes the energy used in the start-up and shut-down cycles
A band 4 inches or more in width
9. What kind of copper tubing is used for refrigeration or air-conditioning applications?
In series
ACR (air-conditioning refrigeration) tubing
400
To remove humidity and lower dry bulb temperature
10. How do you calculate LRA?
Positive
Nominal-sized tubing
Heat load
RLA/FLA x 5
11. What is the typical pressure differance across a TXV?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
15% silphos
100 psig
Positive
12. If the rpm's are 1050 - how many poles does the motor have?
On the common terminal
Slugging
6
Staples and tape
13. How many amps can 12 g wire handle?
4
Fiberglass
Belt drive and direct drive
20 A
14. How do you calculate cfm?
Warning
: Invalid argument supplied for foreach() in
/var/www/html/basicversity.com/show_quiz.php
on line
183
15. The A/C size is calculated by what?
30 degrees F
To remove humidity and lower dry bulb temperature
Heat load
When it is a pull-through evaporator
16. What is the difference between SEER and EER?
A swaging tool
In series
SEER includes the energy used in the start-up and shut-down cycles
Before the vent
17. How is nominal-sized tubing sized?
Duct with insulation on the inside
Inside diameter (ID)
Inches of water column (in. WC)
Nominal-sized tubing
18. What sort of pressure will a push-through evaporator have?
40 A
On the common terminal
A diffuser
Positive
19. 13 SEER is classified as what kind of efficiency?
High
Individual return air systems and central return air systems
300
100 psig
20. Does a package unit come from the factory pre-charged?
12000
100
2 minutes
Yes
21. What type of air conditioning system must be charged using the superheat method?
Any amount
A piston type metering device
4
Slugging
22. How is insulation around a duct rated?
With an are rating
Before the vent
When it is above a conditioned space
400
23. If the rpm's are 750 - how many poles does the motor have?
Fiberglass
Static pressure - velocity pressure - and total pressure
100
8
24. How long should you leave a system off once you kill power before restarting it?
105 degrees F
Potential relay and start capacitor
2 minutes
15 A
25. What kind of metering device do high-efficiency units usually use?
30 degrees F
4
TXV
Stranded
26. How are round ducts connected to one another?
Outside of the male fitting
With a minimum of three evenly spaced self-tapping screws
Static pressure - velocity pressure - and total pressure
True
27. Pressure in ductwork is measured In what?
Pull a vacuum
Inches of water column (in. WC)
6
8
28. How do you calculate LRA?
Latent and sensible
100 psig
RLA/FLA x 5
Compressor
29. How do you calculate EER?
It rises
Btu/hr (output) / wattage (input)
TXV
Potential relay and start capacitor
30. What is the typical pressure differance across a TXV?
Standard
4
100 psig
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
31. 10' round duct has a ballpark cfm of what?
True
The suction line or the low-pressure side
100
400
32. If the rpm's are 750 - how many poles does the motor have?
Heat load
Inclined manometer
A band 4 inches or more in width
8
33. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
40 A
Fiberglass
SEER includes the energy used in the start-up and shut-down cycles
It will have a decrease in superheat
34. Sections of duct board can be fastened together with what?
Yes
Staples and tape
2 minutes
Yes
35. If the rpm's are 3450 - how many poles does the motor have?
2
200
A band 4 inches or more in width
Yes
36. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
18 gauge
In series
105 degrees F
A piston type metering device
37. The fan switch closes at what temperature?
RLA/FLA x 5
140 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Nitrogen with a small amount of refrigerant
38. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
2
Side-by-side and over-and-under
15% silphos
39. 8' round duct has a ballpark cfm of what?
Indoor fan motor - outdoor fan motor - and the compressor
200
2 minutes
Fiberglass
40. What distributes supply air to a room in a structure?
Heat loss
140 degrees F
Average feet per minute X area in square feet (H' x W'/144)
A diffuser
41. How do you calculate ballpark superheat?
Pi x radius squared
Subtract ambient temperature from 100
With a minimum of three evenly spaced self-tapping screws
5 degrees
42. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
It will have a decrease in superheat
Nitrogen with a small amount of refrigerant
With a minimum of three evenly spaced self-tapping screws
43. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Heat load
True
Suction
It will have a decrease in superheat
44. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
When it is above a conditioned space
40 degrees F
A diffuser
45. What is the normal evaporator temperature?
Compressor
45 degrees F
With a minimum of three evenly spaced self-tapping screws
When it is a pull-through evaporator
46. The compressor is cooled by liquid refrigerant. (True of False)
False
8
It rises
Side-by-side and over-and-under
47. What are the two functions of the air-conditioning system?
15 A
When it is above a conditioned space
To remove humidity and lower dry bulb temperature
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
48. Where do you install a trap on a drain line?
Compressor
6
Before the vent
It will be high
49. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
True
Before the vent
Negative
50. 10' round duct has a ballpark cfm of what?
30 degrees F
400
Outside diameter (OD)
Dehydrated with caps on each end