Test
Chapter 3
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Preguntas del test (29)
1Construction uses of steel includes structural steel, cold formed steel, fastening products, reinforcing steel, fastening products, and other miscellaneous products.
- AVerdadero
- BFalso
2Steel is an alloy of iron and [blank_start]carbon[blank_end].
- Acarbon
3The [blank_start]higher[blank_end] the carbon content, the [blank_start]harder[blank_end] & more [blank_start]brittle[blank_end] the steel is.
- Alower
- Bhigher
- Charder
- Dsofter
- Eductile
- Fbrittle
4The four different types of heat treatment for steel includes annealing, denormalizing, hardening, and tempering.
- AVerdadero
- BFalso
5Match each vocabulary word to the proper definition.
(1) [blank_start]Annealing[blank_end] - heating, then slowly cooling to room temperature.
(2) [blank_start]Hardening[blank_end] - higher heat, then rapid cooling by quenching in water/brine/oil
(3) [blank_start]Normalizing[blank_end] - similar to another heat treatment but with hotter temperature and is air cooled. More corrective than strengthening or hardening.
(4) [blank_start]Tempering[blank_end] - reheating hardened steel to a lower temperature and quenching- AAnnealing
- BNormalizing
- CHardening
- DTempering
- EAnnealing
- FNormalzing
- GHardening
- HTempering
- IAnnealing
- JNormalizing
- KHardening
- LTempering
- MAnnealing
- NNormalizing
- OHardening
- PTempering
6Annealing results in the steel getting [blank_start]softer[blank_end] & more [blank_start]ductile[blank_end], [blank_start]increasing[blank_end] the toughness.
- Asofter
- Bharder
- Cbrittle
- Dductile
- Eincreasing
- Fdecreasing
7Normalizing is for [blank_start]corrective[blank_end] purposes.
- Astrengthening
- Bcorrective
- Chardening
8After hardening, the steel is [blank_start]harder[blank_end] & more [blank_start]brittle[blank_end]. Once the hardening treatment is completed, it must be followed by [blank_start]tempering[blank_end].
- Aharder
- Bsofter
- Cbrittle
- Dductile
- Eannealing
- Ftempering
- Gnormalizing
9Tempering increases [blank_start]ductility[blank_end] and [blank_start]toughness[blank_end] after [blank_start]hardening[blank_end].
- Aductility
- Bbrittleness
- Ctoughness
- Dresilience
- Ehardening
- Fannealing
- Gnormalizing
10 [blank_start]Cold[blank_end]-Formed steel products are made by rolling or pressing the steel into semi-finished or finished good at low temperatures.
- ACold
- BMild
11Cold forming results in plastic deformation causing strain-hardening that decreases yield strength, but increases the tensile (ultimate) strength and hardness.
- AVerdadero
- BFalso
12A steel torsion test determines the yield strength, ultimate strength, elongation, and reduction of area (Poisson's Ratio)
- AVerdadero
- BFalso
13A torsion test for steel determines the shear modulus (G).
- AVerdadero
- BFalso
14The Charpy V-notch Impact test measures the resilience or fracture energy at different temperatures.
- AVerdadero
- BFalso
15Protective coatings can be used to isolate the steel from moisture. [blank_start]Barrier coatings[blank_end] requires repeated application and is a standard paint that isolated the steel. [blank_start]Inhibitive primer coatings[blank_end] contain pigments that migrate to the steel surface to passivate it or transfer electrons. [blank_start]Sacrificial primers[blank_end] contain metal or zinc pigments that become anodes. These anodes give up electrons to the steel and corrode instead of the steel.
- AInhibitive Primer coatings
- BBarrier coatings
- CSacrificial Primers
- DInhibitive primer coatings
- EBarrier coatings
- FSacrificial Primers
- GInhibitive Primer coatings
- HBarrier coatings
- ISacrificial primers
16Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell/circuit.
- AVerdadero
- BFalso
17Without CP, protons can cause decomposition of the metal.
- AVerdadero
- BFalso
18Steel production is energy intensive.
- AVerdadero
- BFalso
19The ASTM E8 is a test
- Afor assessing SPF durability when subjected to loading
- Brequiring use of a universal testing machine to evaluate the efficacy of elastometric roof coverings
- Cfor assessing stress-strain relationships for metals used in civil infrastructure
- Dnone of the above
20The horizontal line between 800C and 600C:
- Adistinguishes liquidus and solidus at a critical temperature
- Bdistinguishes the realm of most civil engineering steels (above the line) versus iron carbide (below the line)
- Cindicates when a liquid alloy becomes a solid mixture of alpha and gamma at a specific temperature, rather than existing over a temperature range
- Dindicates that steel with 0.77% carbon melts at 727C
21The horizontal line highlighted indicates:
- Athe critical carbon dissociation temperature above which steels are high-strength
- Ba threshold at which upon cooling the liquid solution under eutectic temperature results into two solid solutions, both coexisting at the same time and in chemical equilibrium
- Ca critical temperature and carbon concentration at which iron is two different materials
- Dnone of the above
22The point highlighted represents the realm of steels with high toughness and less than ~0.03% carbon.
- AVerdadero
- BFalso
23The two points represent eutectoid reaction points, where at specific carbon solubility limits, the microstructure of solid material changes as a function of temperature.
- AVerdadero
- BFalso
24This point represents carbon-saturated stainless steel.
- AVerdadero
- BFalso
25The objectives of steel annealing are:
- Ato refine crystallite grains and remove gases
- Bto remove internal stresses and soften the metal
- Cto increase ductility and toughness
- Dto change electrical and magnetic properties
- Eall of the above
26Increasing carbon content in steel alloys is at the expense of strength.
- AVerdadero
- BFalso
27Which of the following is NOT true with respect to the heat treatment of steel?
- AIf heated steel is air-cooled it can destabilize molecular structure, resulting in non-uniform grain boundaries and make it prone to brittle fracture.
- BHeating, then slow cooling at room temperature anneals steels, making it more ductile and tough.
- CSteel treated at high temperature and then quenched in brine makes it harder and brittle, the reason why the metal must then be tempered.
- DIron must be heated in order to bond with carbon to form steel.
28Steels with higher carbon content are stronger but more brittle than structural steels.
- AVerdadero
- BFalso
29Why does the iron-carbon phase diagram go only to 6.7% carbon?
- Airon carbide is 6.7% carbon by weight so 6.7% carbon correlates to 100% iron
- Biron carbide is 6.7% iron by weight so 6.7% iron correlates directly to 6.7% carbon
- Cbecause that's what people feel like it should be
- Dnone of the above
Información
- Descripción
- (CE Materials) Engineering Test sobre Chapter 3, creado por Kiki Medina el 19/02/2019.
- Autor
- Kiki Medina
- Idioma
- English
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