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