Engineering Flashcards

Engineering notes from the Great Courses Plus (74 cards)

1
Q

3 Types of frame residential bearing wall

A

Bearing Wall

Heavy Timber

Light timber

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2
Q

Live load

A

Loads in a structure that involve movement

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3
Q

How do bearing wall structures work

A

Joist spread that weight out dispersing load to the bearing walls

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4
Q

Number stamps on lumber are called

A

Select Structural (lower grade is better)

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5
Q

Girder

A

Main beam that supports other smaller beams

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6
Q

Sill Plate

A

Lumber that is bolted to the top of the basement cement wall to attach the house

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7
Q

Rim Joist

A

Lumber on wall that the joists are attached to

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8
Q

Trimmer Joist and Headers

A

Rim joists that are used on openings in the floor for stairways

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9
Q

OSB sf

A

Oriented Strand Board

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10
Q

Oriented Strand Board

A

Pasted strips of wood often used for flooring

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11
Q

Deflection Failure

A

When joist bends angularly beyond breaking point

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12
Q

Lateral Torsioning

A

When a joist turns sideways and structure falls

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13
Q

Platform structures use which kind of joist sizes?

A

Long and tall but supported

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14
Q

Studs are attached to floor and ceiling with

A

Sole plate and top plate

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15
Q

Header

A

Wooden beam over there door

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16
Q

Sheathing

A

Wooden walls on studs that prevents buckling

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17
Q

Truss

A

Beam between rafters that holds it together

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18
Q

Purposes of building envelope

A
  • Sheds rainwater
  • Prevents ice pentration
  • Prevents groundwater infiltration
  • Removes internal moisture
  • Insulates
  • Fire resistant
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19
Q

Roofing felt is usually sold in

A

36 inch rolls

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20
Q

Flashing

A

Strips of sheet metal for preventing leaks at intersections

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21
Q

Tar has been replaced with

A

Housewrap, which is like an ikea bag.

It’s good cause it doesn’t let water through, but allows vapor to pass

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22
Q

Cladding

A

The outside layer like siding or brick

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23
Q

Hydrostatic Pressure

A

Pressure caused by the water’s own wet

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24
Q

Aquifer

A

Underground fresh water supply

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25
Algae blooms are caused by
fertilizer runoff
26
Methods to deal with algae in reservoir
Copper Sulfate Mechanical filtering Limit water runoff Underwater aerator
27
Anoxia cause and issues
Depletion of oxygen at the bottom of reservoir by copper oxide. Kills fish and anaerobic bacteria gives weird smell
28
3 basic functions in water filtration plant
Clarification Filtration Disinfection
29
Clarification steps
Filter out big things Coagulation with agitation (clumps things you don't want) Flocculation (clumps sink)
30
Filtering steps
Filter with stones and coals Disinfected with chlorine, O3, or ultraviolet light
31
Coal impurities
Hydrogen, sulfur, oxygen, and nitrogen
32
Coal layers and types
Peat Lignite Subbitumous Bituminous Antracite
33
Long wall mining
Wall collapses behing machine as it mines coal
34
The king of machines
Drag line
35
Gasoline is mostly made of
C6-C8
36
Fractionating
Boiling crude oil to collect only the right alkanes
37
Fracking
Using a combination of liquids down a boar hole to extract more oil, but it is environmentally problematic
38
Benefit of oil power plants
It uses the waste product of oil refinery that has no other use
39
Natural Gas Power uses what instead of boiling water steam
Combustion Turbine (Jet) running on the natural gas combustion
40
Combustion Turbine parts
Compressor, combustion system, turbine, driveshaft
41
Advantages of gas vs coal power plants
Far less environmentally toxic Less footprint Easily shut off and on
42
Fissile Material
Material capable of sustaining the chain reaction with nuclear fission Usually Uranium 235
43
Hyperboloid Cooling Towers Cools with zero energy usage as the top collects cool air and bottom absorbs water.
44
Penstock
Tube in a dam that transfers water to the turbine
45
Enginerring Parts of a wind turbine
Turbine uses bernoulie's principle to use lift the blades up Nacelle is programmed to change direction and has a generator. Includes a gear box and keeps it at constant pace by rotating the blades
46
Why 3 blades on a wind turbine
Only 6, then 3, then less power generation per blade making the extra blade inefficient
47
Megawattage comparison of wind turbine to coal plant
1.5 mega watts to 1500 megawatts
48
Two types of solar power
Solar thermal Solar voltaics
49
How solar thermal power works
Thermal energy uses mirrors to heat an oil to 750 c which boils water to generate steam
50
How Ivan Pah solar plant works
3 water towers are heated by hundreds of mirrors.
51
Photovotaics
Uses solar radiation to cause photovotaic effect Free electrons cause a current
52
Electrical Transmission Trail
Switchyard Transmission Feeder Regional Substation Local Substation (down to 120 volt)
53
How to caculate size changes due to temperature
Thermal Deformation
54
How does radio work?
Electrons when moving cause electromagnetic radiation
55
Why are wires twisted and in rubber?
To limit electromagnetic radiation
56
FM Radio Waves at 100 mhz are how long?
About 10 feet long
57
Why can rain and fog affect signal strength?
The waves are so short that they can be degraded by rain and fog
58
Things to know about low vs high frequency waves in radio
High frequencies can carry more information but are so short they cannot go far and are affected by interference
59
Cell phone mhz range
700-2400 mhz
60
Difference between a cell phone and walkie talkie
Cell phone uses two bands for two way communication Cell phones are digital
61
How do cell phone companies manage millions of people within the same frequencies?
Space Division Multiplexing Areas are separated into hexagonal cells, the cells around use different frequencies
62
Biggest difference between 1g data and 2g data
2g is digital, allowed text messages Incorporated time division multiple access
63
Multiple Access
Frequencies and channels are split into time components so fast the user doesn't notice.
64
3g updates
Code division multiple access (spread spectrum)
65
Code division multiple access
Using full range of frequency spectrum but has a particular coding that only your phone recognizes Like recognizing only one voice in a noisy area
66
If a phone doesn't find its System Identifier Number it will
Roam for one
67
Closest and furthest points of a satelite to the earth
Perigee and Apogee
68
Piston Strokes
Induction stroke Compression Stroke
69
Carburetor
Regulate the amount of oxygen and fuel for combustion
70
Fuel Injection
Sprays fuel into each intake port
71
Alternator
Belt driven generator that provides power to the car
72
Parts of bridge girder
Flanges (top and bottom) Web Diaphragm
73
Belt and supenders engineering
Taking absolutly every reasonable precaution, and having a backup plan if it fails
74
3 Types of Tunnels
Cut and Cover Bored Tunnel Immersed tube tunnels