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Mine > Engineering > Flashcards

Engineering Flashcards

Engineering notes from the Great Courses Plus

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
Q

Algae blooms are caused by

A

fertilizer runoff

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26
Q

Methods to deal with algae in reservoir

A

Copper Sulfate

Mechanical filtering

Limit water runoff

Underwater aerator

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27
Q

Anoxia cause and issues

A

Depletion of oxygen at the bottom of reservoir by copper oxide.

Kills fish and anaerobic bacteria gives weird smell

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28
Q

3 basic functions in water filtration plant

A

Clarification

Filtration

Disinfection

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29
Q

Clarification steps

A

Filter out big things

Coagulation with agitation (clumps things you don’t want)

Flocculation (clumps sink)

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30
Q

Filtering steps

A

Filter with stones and coals

Disinfected with chlorine, O3, or ultraviolet light

31
Q

Coal impurities

A

Hydrogen, sulfur, oxygen, and nitrogen

32
Q

Coal layers and types

A

Peat

Lignite

Subbitumous

Bituminous

Antracite

33
Q

Long wall mining

A

Wall collapses behing machine as it mines coal

34
Q

The king of machines

A

Drag line

35
Q

Gasoline is mostly made of

A

C6-C8

36
Q

Fractionating

A

Boiling crude oil to collect only the right alkanes

37
Q

Fracking

A

Using a combination of liquids down a boar hole to extract more oil, but it is environmentally problematic

38
Q

Benefit of oil power plants

A

It uses the waste product of oil refinery that has no other use

39
Q

Natural Gas Power uses what instead of boiling water steam

A

Combustion Turbine (Jet) running on the natural gas combustion

40
Q

Combustion Turbine parts

A

Compressor, combustion system, turbine, driveshaft

41
Q

Advantages of gas vs coal power plants

A

Far less environmentally toxic

Less footprint

Easily shut off and on

42
Q

Fissile Material

A

Material capable of sustaining the chain reaction with nuclear fission

Usually Uranium 235

43
Q
A

Hyperboloid Cooling Towers

Cools with zero energy usage as the top collects cool air and bottom absorbs water.

44
Q

Penstock

A

Tube in a dam that transfers water to the turbine

45
Q

Enginerring Parts of a wind turbine

A

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
Q

Why 3 blades on a wind turbine

A

Only 6, then 3, then less power generation per blade making the extra blade inefficient

47
Q

Megawattage comparison of wind turbine to coal plant

A

1.5 mega watts to 1500 megawatts

48
Q

Two types of solar power

A

Solar thermal

Solar voltaics

49
Q

How solar thermal power works

A

Thermal energy uses mirrors to heat an oil to 750 c which boils water to generate steam

50
Q

How Ivan Pah solar plant works

A

3 water towers are heated by hundreds of mirrors.

51
Q

Photovotaics

A

Uses solar radiation to cause photovotaic effect

Free electrons cause a current

52
Q

Electrical Transmission Trail

A

Switchyard

Transmission Feeder

Regional Substation

Local Substation (down to 120 volt)

53
Q

How to caculate size changes due to temperature

A

Thermal Deformation

54
Q

How does radio work?

A

Electrons when moving cause electromagnetic radiation

55
Q

Why are wires twisted and in rubber?

A

To limit electromagnetic radiation

56
Q

FM Radio Waves at 100 mhz are how long?

A

About 10 feet long

57
Q

Why can rain and fog affect signal strength?

A

The waves are so short that they can be degraded by rain and fog

58
Q

Things to know about low vs high frequency waves in radio

A

High frequencies can carry more information but are so short they cannot go far and are affected by interference

59
Q

Cell phone mhz range

A

700-2400 mhz

60
Q

Difference between a cell phone and walkie talkie

A

Cell phone uses two bands for two way communication

Cell phones are digital

61
Q

How do cell phone companies manage millions of people within the same frequencies?

A

Space Division Multiplexing

Areas are separated into hexagonal cells, the cells around use different frequencies

62
Q

Biggest difference between 1g data and 2g data

A

2g is digital, allowed text messages

Incorporated time division multiple access

63
Q

Multiple Access

A

Frequencies and channels are split into time components so fast the user doesn’t notice.

64
Q

3g updates

A

Code division multiple access (spread spectrum)

65
Q

Code division multiple access

A

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
Q

If a phone doesn’t find its System Identifier Number it will

A

Roam for one

67
Q

Closest and furthest points of a satelite to the earth

A

Perigee and Apogee

68
Q

Piston Strokes

A

Induction stroke

Compression Stroke

69
Q

Carburetor

A

Regulate the amount of oxygen and fuel for combustion

70
Q

Fuel Injection

A

Sprays fuel into each intake port

71
Q

Alternator

A

Belt driven generator that provides power to the car

72
Q

Parts of bridge girder

A

Flanges (top and bottom)

Web

Diaphragm

73
Q

Belt and supenders engineering

A

Taking absolutly every reasonable precaution, and having a backup plan if it fails

74
Q

3 Types of Tunnels

A

Cut and Cover

Bored Tunnel

Immersed tube tunnels

Mine (3 decks)

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