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CEMATEL LQ3
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  • 問題数 62 • 3/17/2024

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    問題一覧

  • 1

    What is the Characteristic of metal that allows it to resist scratches or surface cuts?

    Hardness

  • 2

    What do you call the charcteristics of metal to resist impact without permanent deformation?

    Toughness

  • 3

    What is the degrading result caused by oxidation of metals? (One Word)

    Corrosion

  • 4

    Which among those listed below are the processes of extracting metal from the ore?

    Leaching, Smelting

  • 5

    Ways to prevent oxidation of metal may be done by

    Galvanizing, Asphalt Coating, Painting the Metal, Concrete Encasing

  • 6

    What is the progressive fracture of metal under repeated load?

    Fatigue

  • 7

    What is the term used for metal coating by hot-dipping in zinc?

    Galvanizing

  • 8

    The Maximum Stress in the stress-strain curve of metal

    Tensile Strength, Ultimate Strength

  • 9

    In Tension Testing metal bars, what do you call the stage when the metal appears to exhibit increase in strength after yielding?

    Strain Hardening

  • 10

    The term used for material associated with ore that has no commercial value

    Gangue

  • 11

    The value of the area under the straight lineor elastic portion of the stress-strain curve of metal is called the modulus of

    Resilience

  • 12

    Pyrometallurgy is also known as

    Smelting

  • 13

    What is an alloy of iron and carbon?

    Steel

  • 14

    What are the typical characteristics of metal?

    Malleable, Ductile, Fusible

  • 15

    The use of chemical reagents such as carbon monoxide, can be used in refining metal

    True

  • 16

    Which is not a main operation in metal production?

    Galvanizing

  • 17

    What is the term used for a rock that contains sufficient minerals with important elements including metals that can be economically extracted from the rock?

    Ore

  • 18

    What is the term used for stress that will cause rupture at. given time and temperature, and usually at high temperature?

    Stress Rupture

  • 19

    What is the principal element of ferrous metals?

    Iron

  • 20

    According to the NSCP, what is the value of the modulus of elasticity that can be adopted for steel in MPa

    200,000

  • 21

    In which ore classification can iron be extracted?

    Oxides, Carbonates

  • 22

    The characteristic of metal to change shape by pounding or hammering

    Malleable

  • 23

    Alloys steel that we use in construction usually belong to the group of alloys that combine with carbon to carbides.

    False

  • 24

    What is the most undesirable impurity of steel?

    Phosphorous

  • 25

    It is possible to make steel alloys with increased strength, toughness, and corrosion resistance that can be used in construction

    True

  • 26

    The grade of steel reinforcing bar is based on property of steel

    Yield Strength

  • 27

    What is the process of heating steel above the critical temperature range, holding it at that temperature for the proper period of time, ad then slowly cooling?

    Annealing

  • 28

    The impurity may be beneficial to steel at small quantities (0.3%-1.0%) but detrimental at larger quantities (1.5% and above)

    Manganese

  • 29

    Which steel has the lowest carbon content?

    Mild Steel

  • 30

    It is possible to make cast iron malleable by undergoing a special annealing treatment after casting.

    True

  • 31

    The two tyes of furnaces that account for virtually all primary steel production are ____ furnace and ____ furnace.

    Basic Oxygen, Electric Arc

  • 32

    What are the basic quenching media of steel?

    Brine, Oil, Water

  • 33

    The carbon content if this steel is from 0.3% to to 0.6%. Example of this are the reinforcing steel bars

    Medium Carbon Steel

  • 34

    The process of blowing finely divided air currents through a bath of molten iron contained in a converter to remove impurities by oxidation is called

    Bessemer Furnace

  • 35

    List at least one wood composite that was discussed in class

    Hardboard

  • 36

    Seasoned lumber has many advantages over green lumber such as:

    Reduction of weight, Increased nail-holding power of wood, Increased Strength

  • 37

    Shrinkage of wood starts when the moisture content is below what alue?

    Approximately 30% MC, Fiber Saturation Point

  • 38

    The unit of measure used for a piece of wood 1 ft x 1 ft x 1 in

    Board Foot

  • 39

    Which amonglisted are insects that cuse wood deterioration

    Powder Post Beetles, Termites, Carpenter ants

  • 40

    Plywood is usually available in what size?

    1.2m x 2.4m , 4’x8’

  • 41

    The Cemical Component of wood that acts as bonding agent which glues cells together

    Lignin

  • 42

    The continuous ring of reproductive tissu located between the sapwood and the inner layer of the bark

    Cambium

  • 43

    The Term used for wood that has been rough sawn and cut to length, typically in standard increments, such as 2”x4”x8”, to be used in construction

    Lumber

  • 44

    What is the method of seasonng wood by heating to remove moisture using warm moist air or superheate steam?

    Kiln-Drying

  • 45

    What is the size of lumber when it is cure from the log?

    Nominal Size

  • 46

    How many Board feet are there in 4 pieces of 2”x4”x16”?

    43

  • 47

    Plywood is a non-engineered wood product

    False

  • 48

    Tree Classification based on the growth from the center out by adding concentric layer

    Exogenous

  • 49

    What is the most common composite that are made of veneers glued together?

    Plywood

  • 50

    Which among listed are wood preservatives?

    Chromated Copper Arsenate, Coal-tar creosote, Pentachlorophenol

  • 51

    Which are false about wood

    Mechanical properties do not vary between species

  • 52

    The central core of the log that is composed of inactive cells and serves only as a mechanical support

    Heartwood

  • 53

    What are the 3 principal axes of wood?

    Radial Axis, Longitudinal Axis, Tangential Axis

  • 54

    The term used referring to cracks between and parallel to annual rings of lumber

    shakes

  • 55

    what property of wood affect its strength and shrinkage?

    Moisture Content

  • 56

    Which are defect of lumber?

    Decay, Checks, Bow

  • 57

    If the specific gravity is 0.57 and the moisture content is 16%, what is the density of the wood in kg.m^3

    611

  • 58

    Warping of lumber due to distortion in which the edge is convex or concave longitudinal

    Crook

  • 59

    The labels for MSG groups are based on what allowable stress

    Bending

  • 60

    In visual stress grading of lumber, the problem in identifying wood species have prompted designers to use what percentage stress grade?

    50% stress grade

  • 61

    Cracks on lumber going all the way through its thickness, commonly at the ends

    Split

  • 62

    What property of wood affects its nail holding power?

    Moisture Content